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Bauer, Tobias, Associate professorORCID iD iconorcid.org/0000-0003-1627-7058
Alternative names
Publications (10 of 52) Show all publications
Andersson, J., Bauer, T. & Lynch, E. P. (2020). Evolution of structures and hydrothermal alteration in a Palaeoproterozoic supracrustal belt: Constraining paired deformation–fluid flow events in an Fe and Cu–Au prospective terrain in northern Sweden. Solid Earth, 11(2), 547-578
Open this publication in new window or tab >>Evolution of structures and hydrothermal alteration in a Palaeoproterozoic supracrustal belt: Constraining paired deformation–fluid flow events in an Fe and Cu–Au prospective terrain in northern Sweden
2020 (English)In: Solid Earth, ISSN 1869-9510, E-ISSN 1869-9529, Vol. 11, no 2, p. 547-578Article in journal (Refereed) Published
Abstract [en]

An approximately 90 km long Palaeoproterozoic supracrustal belt in the northwestern Norrbotten ore province (northernmost Sweden) was investigated to characterize its structural components, assess hydrothermal alteration–structural geology correlations, and constrain a paired deformation–fluid flow evolution for the belt. New geological mapping of five key areas (Eustiljåkk, Ekströmsberg, Tjårrojåkka, Kaitum West, and Fjällåsen–Allavaara) indicates two major compressional events (D1 and D2) have affected the belt, with each associated with hydrothermal alteration types typical for iron oxide–apatite and iron oxide Cu–Au systems in the region. Early D1 generated a regionally distributed, penetrative S1 foliation and oblique reverse shear zones that show a southwest-block-up sense of shear that formed in response to NE–SW crustal shortening. Peak regional metamorphism at epidote–amphibolite facies broadly overlaps with this D1 event. Based on overprinting relationships, D1 is associated with regional scapolite ± albite, magnetite + amphibole, and late calcite alteration of mafic rock types. These hydrothermal mineral associations linked to D1 structures may form part of a regionally pervasive evolving fluid flow event but are separated in this study by crosscutting relationships.

During D2 deformation, folding of S0–S1 structures generated F2 folds with steeply plunging fold axes in low-strain areas. NNW-trending D1 shear zones experienced reverse dip-slip reactivation and strike-slip-dominated movements along steep, E–W-trending D2 shear zones, producing brittle-plastic structures. Hydrothermal alteration linked to D2 structures is a predominantly potassic–ferroan association comprising K-feldspar ± epidote ± quartz ± biotite ± magnetite ± sericite ± sulfides. Locally, syn- or post-tectonic calcite is the main alteration mineral in D2 shear zones that intersect mafic rocks. Our results highlight the importance of combining structural geology with the study of hydrothermal alterations at regional to belt scales to understand the temporal–spatial relationship between mineralized systems. Based on the mapping results and microstructural investigations as well as a review of earlier tectonic models presented for adjacent areas, we suggest a new structural model for this part of the northern Fennoscandian Shield. The new model emphasizes the importance of reactivation of early structures, and the model harmonizes with tectonic models presented by earlier workers based mainly on petrology of the northern Norrbotten area.

Place, publisher, year, edition, pages
Copernicus publications, 2020
National Category
Geology
Research subject
Ore Geology
Identifiers
urn:nbn:se:ltu:diva-78783 (URN)10.5194/se-11-547-2020 (DOI)000527805400001 ()2-s2.0-85083756752 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-05-05 (johcin)

Available from: 2020-05-05 Created: 2020-05-05 Last updated: 2020-05-05Bibliographically approved
Sarlus, Z., Andersson, U. B., Martinsson, O., Bauer, T. E., Wanhainen, C., Andersson, J. B. .. & Whitehouse, M. J. (2020). Timing and origin of the host rocks to the Malmberget iron oxide-apatite deposit, Sweden. Precambrian Research, 342, Article ID 105652.
Open this publication in new window or tab >>Timing and origin of the host rocks to the Malmberget iron oxide-apatite deposit, Sweden
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2020 (English)In: Precambrian Research, ISSN 0301-9268, E-ISSN 1872-7433, Vol. 342, article id 105652Article in journal (Refereed) Published
Abstract [en]

The northern Norrbotten region in Sweden hosts abundant iron-oxide apatite (IOA) deposits including Kiirunavaara, the type locality for Kiruna-type deposits, and Malmberget. Felsic and intermediate metavolcanic rocks hosting the Malmberget IOA deposit contain oscillatory zoned zircon which yield magmatic U-Pb SIMS ages of 1885±6 Ma and 1881±6 Ma, respectively. Metamorphic rims on zircon from these rocks yield 1797±7 Ma and 1775±6 Ma, respectively, and record the age of the latest Svecofennian regional metamorphic event in the Gällivare area, tentatively interpreted as regional contact metamorphism. Two granite dikes that cut the ore yield U-Pb zircon emplacement ages of 1790±6 Ma and 1791±7 Ma, respectively, overlapping with the metamorphic overgrowths, and set a lower age limit for ore formation in the Malmberget IOA deposit. Rocks hosting the Malmberget IOA deposit have an alkalic to alkali-calcic affinity with a geochemical signature that favors a continental-arc, transitional to extensional setting. These rocks are suggested to have been generated in a back-arc region, in response to subduction beneath the craton margin retreating to the SW or W. The obtained ages and geochemical signatures of these rocks coincide well with the regionally defined Kiirunavaara group rocks, hosting several other IOA deposits in northern Sweden.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
U-Pb SIMS geochronology, northern Sweden, Svecofennian, IOA deposit
National Category
Geology
Research subject
Ore Geology
Identifiers
urn:nbn:se:ltu:diva-77874 (URN)10.1016/j.precamres.2020.105652 (DOI)000528208200001 ()2-s2.0-85080036882 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-04-06 (alebob)

Available from: 2020-02-26 Created: 2020-02-26 Last updated: 2020-05-14Bibliographically approved
Juanatey, M. A. G., Hübert, J., Tryggvason, A., Juhlin, C., Pedersen, L. B., Bauer, T. E. & Dehghannejad, M. (2019). 2D and 3D MT in the central Skellefte Ore District, northern Sweden. Tectonophysics, 764, 124-138
Open this publication in new window or tab >>2D and 3D MT in the central Skellefte Ore District, northern Sweden
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2019 (English)In: Tectonophysics, ISSN 0040-1951, E-ISSN 1879-3266, Vol. 764, p. 124-138Article in journal (Refereed) Published
Abstract [en]

New broadband magnetotelluric (MT) data have been acquired along two parallel profiles in the central part of the metallogenic Skellefte district in northern Sweden. The data were recorded as part of the Swedish 4D modelling of mineral belts project and cover an area with several economical and sub-economical deposits. The dimensionality and quality of the data were carefully analyzed and new error floors were systematically determined prior to inverse modelling in 2D and 3D. The algorithms used were EMILIA and WSINV3DMT. For the 2D inversion, only the determinant of the impedance tensor was used, while for the 3D inversion all elements were considered. The obtained models fit the inverted data, and image the main regional features. A detailed comparison reveals the superiority of the 3D model, both in model structures and data fit. After assessing the main features in the model, an interpretation is proposed and refined with the support of previous geophysical studies. The most interesting features are large and medium-sized conductors associated with crustal-scale shear zones and faults within the Skellefte Group rocks. These may be depicting a network of fossil pathways for hydrothermal fluid transport and as such, provide new insight into past processes in the area.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Magnetotellurics 3D inversion, Deep exploration, Brownfield, Shear zones, Mineral systems
National Category
Geology
Research subject
Ore Geology
Identifiers
urn:nbn:se:ltu:diva-73685 (URN)10.1016/j.tecto.2019.04.003 (DOI)000472697900008 ()2-s2.0-85066444822 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-06-27 (johcin)

Available from: 2019-04-17 Created: 2019-04-17 Last updated: 2019-08-15Bibliographically approved
Bauer, T., Andersson, J. B. .. & Kampmann, T. C. (2019). Analysis of data from Unmanned Aerial Systems (UAS) in a Virtual Reality environment. In: Tobias C. Kampmann (Ed.), Proceedings of the Visual3D conference: . Paper presented at Visual3D conference 2019, 1–2 October, Uppsala, Sweden (pp. 19-19).
Open this publication in new window or tab >>Analysis of data from Unmanned Aerial Systems (UAS) in a Virtual Reality environment
2019 (English)In: Proceedings of the Visual3D conference / [ed] Tobias C. Kampmann, 2019, p. 19-19Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

The use of Unmanned Aerial Systems (UAS) is getting increasingly popular for many different types of applications. The field of geology is slowly catching up resulting in new and innovative UAS solutions for various kinds of airborne measurement techniques. These techniques comprise a wide range of geophysical and remote sensing methods used to investigate the sub-surface. At Luleå University of Technology two different types of UAS are used in combination with a Virtual Reality environment in order to analyze geological structures and related ore deposits and mineralizations. The two UAS comprise a) a custom made quadrocopter (HUGIN) with a pay load of approx. 3.5 kg and an operational time of 5 times (batteries) maximum 35 minutes depending on payload, ambient temperatures and wind speed; and b) a foldable DJI Mavic Pro with an operational time of 3 times 30 minutes. The HUGIN system can be operated with a high-resolution optical camera for photogrammetry surveys and a 3-axial fluxgate magnetometer for measuring magnetic anomalies within bedrock and ultimately delineating geological structures. The system is highly flexible and a thermal camera is currently added to the system in order detect water fluxes in relation to geological structures or exothermal mineral processes. The DJI system is equipped with an optical camera for photogrammetric surveying and is a highly valuable tool in remote areas due to its lightweight and compact construction.Data acquired from both UAS is subsequently analysed in a Virtual Reality lab utilizing a 6m wide screen with active stereo functions. Photogrammetry data is first processed using the Aigsoft software package following a Structure for Motion (SfM) workflow where dense point cloud models and subsequently meshed and textured 3D surface models are produced. These models are then converted and transferred to the GeoVisionary software package that allows visualization of models in stereo 3D view. This allows digitizing geological structures such as foliation, fractures, and faults among others in an immersive 3D environment and provides an efficient tool complimentary to traditional field mapping. In particular, this makes it possible to capture and analyse data from hardly accessible and dangerous areas such as rock faces in open pits. Another complimentary method of data analysis comprises SCAT analysis of the meshed surfaces using the MOVE software package.

National Category
Geosciences, Multidisciplinary
Research subject
Ore Geology
Identifiers
urn:nbn:se:ltu:diva-76446 (URN)978-91-7790-474-8 (ISBN)
Conference
Visual3D conference 2019, 1–2 October, Uppsala, Sweden
Available from: 2019-10-18 Created: 2019-10-18 Last updated: 2019-10-18
Sarlus, Z., Martinsson, O., Bauer, T., Wanhainen, C., Andersson, J. & Nordin, R. (2019). Character and tectonic setting of plutonic rocks in the Gällivare area, northern Norrbotten, Sweden. GFF, 141(1), 1-20
Open this publication in new window or tab >>Character and tectonic setting of plutonic rocks in the Gällivare area, northern Norrbotten, Sweden
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2019 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 141, no 1, p. 1-20Article in journal (Refereed) Published
Abstract [en]

Petrographical and lithogeochemical investigations in combination with mapping in the Gällivare area, northern Norrbotten, Sweden, have led to the identification of several igneous intrusive rock types. These include: (1) ultramafic-mafic complexes, (2) mafic-intermediate rocks, (3) dolerites and (4) felsic plutons. The ultramafic-mafic rocks include the ca. 1.88 Ga Dundret complex and ca. 1.80 Ga Vassaravaara complex. The Dundret complex has tholeiitic to calc-alkaline affinity, shows a primitive mineral content and was formed in an extensional tectonic setting. The Vassaravaara complex has a similar chemical signature as the Dundret complex. The mafic-intermediate plutons vary in composition from gabbro to diorite. The chemical signature of the dioritic rocks indicate formation in a volcanic arc setting. Dolerites occur as solitary dikes and have calc-alkaline affinity. The felsic plutons include granite and syenite of ca. 1.88, 1.80 and 1.78 Ga age. The felsic plutons have calc-alkaline to shoshonitic affinity and mostly show a metaluminous I-type character. Results indicate subduction at 1.90 Ga resulting in a volcanic arc system, and including extensional events generating back-arc environments leading to mafic, intermediate and felsic magmatism in the Gällivare area. Subduction at 1.80 Ga is suggested to have caused a similar process generating mafic and felsic magmatic rocks in the same area. A subsequent collision event finally generated 1.78 Ga granitic rocks.

Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
Gällivare area, mafic layered intrusions, petrography, lithogeochemistry, back-arc environment
National Category
Geology
Research subject
Ore Geology
Identifiers
urn:nbn:se:ltu:diva-69190 (URN)10.1080/11035897.2018.1526209 (DOI)000467182600001 ()
Note

Validerad;2019;Nivå 2;2019-06-18 (johcin)

Available from: 2018-06-08 Created: 2018-06-08 Last updated: 2019-06-18Bibliographically approved
Kampmann, T. C. & Bauer, T. (2019). The benefits of organized networking and matchmaking for the development of 3D/4D geomodel visualization. In: Tobias C. Kampmann (Ed.), Proceedings of the Visual3D conference 2019, 1–2 October, Uppsala, Sweden. Luleå University of Technology, 60 pages.: Visualization of 3D/4D models in geosciences, exploration and mining. Paper presented at Visual3D conference 2019, 1–2 October, Uppsala, Sweden (pp. 43-43). Luleå, Sweden: Luleå University of Technology
Open this publication in new window or tab >>The benefits of organized networking and matchmaking for the development of 3D/4D geomodel visualization
2019 (English)In: Proceedings of the Visual3D conference 2019, 1–2 October, Uppsala, Sweden. Luleå University of Technology, 60 pages.: Visualization of 3D/4D models in geosciences, exploration and mining / [ed] Tobias C. Kampmann, Luleå, Sweden: Luleå University of Technology, 2019, p. 43-43Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

While huge territory of the EU shows a very high exploration potential and many EU countries remain attractive to investors (e.g. Fraser Institute, 2015), a mere 4% of global exploration expenditure is currently invested within European countries. One tool to trigger a higher degree of investment in exploration and to secure the domestic supply of both main commodities and critical raw materials (CRM) is to enhance our three-dimensional geometric understanding of the Earth’s crust.For these reasons, EIT Raw Materials decided to fund the Visual3D network of infrastructure (NoI) for three years (2017–2019). Visual3D involves to-date 14 partner organisations from nine EU countries. The NoI aims to integrate expertise within exploration and 3D modelling from industry, academia and research institutes, with the ambition to increase the understanding of geological bodies in 3D and 4D through improved visualisation techniques. The network believes firmly that the integration of novel visualization technologies (e.g. virtual and augmented reality) into workflows of exploration, mining and geoscientific research will bring a much-needed innovation boost to the European raw materials sector and increase its competitiveness.During its first year, Visual3D has compiled the network expertise and infrastructure regarding visualization tools available at the partner facilities. An overview of this infrastructure, as well as projects conducted by network partners is available on the Visual3D homepage (www.visual3d.info). The network also managed to identify common issues in the field of geomodelling, the solutions to which may be facilitated by a pan-European network approach, such as data compatibility, communication of geomodels, as well as complexity and variety of software. Subsequent years have been dedicated to the conceptualization of possible projects in order to solve the issues name above, as well as matchmaking to find expert consortia for these projects.So far, four workshops including project partners and invited external stakeholders have been held. Networking and matchmaking during these workshops has resulted in successful project proposals in the EIT RawMaterials KAVA calls for educational (MireBooks), as well as upscaling projects (FARMIN). Both these projects are presented at the Visual3D conference 2019. Further project ideas have been discussed within Visual3D and will be developed further.The benefits of organized networking in novel research and developments fields, such as visualization of 3D/4D models for exploration and geosciences, has become apparent during the lifetime of the Visual3D network. The network partners would encourage pan-European funding institutions such as EIT RawMaterials to provide continuous funding to similar networking initiatives, especially in highly innovative and novel research fields. Well-organized communication between different stakeholders is the basis of technological innovation and has the potential to give the European raw materials sector the leading edge in this highly competitive global market.

Place, publisher, year, edition, pages
Luleå, Sweden: Luleå University of Technology, 2019
National Category
Geosciences, Multidisciplinary
Research subject
Ore Geology
Identifiers
urn:nbn:se:ltu:diva-76441 (URN)978-91-7790-474-8 (ISBN)
Conference
Visual3D conference 2019, 1–2 October, Uppsala, Sweden
Available from: 2019-10-18 Created: 2019-10-18 Last updated: 2019-10-18
Zainy, M. T., Bauer, T., Al-Ansari, N. & Ask, M. (2018). Geometric Analysis of the Minor Structures in Iraqi Part of the Zagros Belt, NE Iraq. In: M. Gurhan Yalcin, Yasemin Leventeli (Ed.), 9th International Symposium on Eastern Mediterranean Geology 07-11 May 2018 Antalya-Turkey: Abstracts and Proceedings Book. Paper presented at 9th International Symposium on Eastern Mediterranean Geology; 07-11 May 2018; Antalya-Turkey (pp. 324-324). Turkey: Academic Conferences Publishing
Open this publication in new window or tab >>Geometric Analysis of the Minor Structures in Iraqi Part of the Zagros Belt, NE Iraq
2018 (English)In: 9th International Symposium on Eastern Mediterranean Geology 07-11 May 2018 Antalya-Turkey: Abstracts and Proceedings Book / [ed] M. Gurhan Yalcin, Yasemin Leventeli, Turkey: Academic Conferences Publishing, 2018, p. 324-324Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

Geometric analysis was carried out on part of the Zagros Belt, along the border between Iraq andIran, within rocks of Cretaceous age, which are composed of alternative sequences of competentand incompetent layers, and it contains a number of minor structures. The minor folds identifiedwithin the study area have different shapes, orientations and sizes, and exhibit high intensityfolding. Their wave length and amplitude range from few centimeters up to tens of meters. They areranged from gentle to tight according to the Fleuty, 1964 classification. Class 1B is dominated andfollowed by class 1C according to the Ramsay, 1967. The orientation of the minor folds, theirrelation with the major structures, variance in their shapes and sizes and difference interlimb angle,all indicate that they were developed progressively and in harmony with the major structuredevelopment. It can be concluded that the congruous and subcongruous minor folds weredeveloped successively during a single phase of deformation with simulation of variouscompressive stress directions (generally, at NE-SW and E-W), and the reorientation of the stressfield from one direction to another is attributed to the oblique collision between the Arabian andEurasian plates and to the anticlockwise rotation of the Arabian plate relative to Eurasian plate.

Place, publisher, year, edition, pages
Turkey: Academic Conferences Publishing, 2018
Keywords
Geomertrical Analysis, Minor Folds, Zagros Belt
National Category
Geology
Research subject
Applied Geology
Identifiers
urn:nbn:se:ltu:diva-77477 (URN)978-605-4483-50-1 (ISBN)
Conference
9th International Symposium on Eastern Mediterranean Geology; 07-11 May 2018; Antalya-Turkey
Funder
Luleå University of Technology
Available from: 2020-01-22 Created: 2020-01-22 Last updated: 2020-02-18Bibliographically approved
Bauer, T., Andersson, J., Sarlus, Z., Lund, C. & Kearney, T. (2018). Structural controls on the setting, shape and hydrothermal alteration of the Malmberget IOA deposit, northern Sweden. Economic geology and the bulletin of the Society of Economic Geologists, 113(2), 377-395
Open this publication in new window or tab >>Structural controls on the setting, shape and hydrothermal alteration of the Malmberget IOA deposit, northern Sweden
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2018 (English)In: Economic geology and the bulletin of the Society of Economic Geologists, ISSN 0361-0128, E-ISSN 1554-0774, Vol. 113, no 2, p. 377-395Article in journal (Refereed) Published
Abstract [en]

The Malmberget iron oxide-apatite (IOA) deposit in northern Sweden is one of the largest underground iron ore mine operations in the world with estimated ore reserves in 2015 of 346 million metric tons (Mt) at 42.5% Fe. The underground operation is concentrated in 10 orebodies of 5 to 245 Mt each, which currently produce 17.4 Mt of apatite iron ore per year. Structural investigations were combined with data on hydrothermal mineral assemblages in order to reconstruct the relative timing of ore-forming, deformation, and overprinting hydrothermal events. The results improve the understanding of structural geometries, relationships, and control on orebody transposition in the deposit. A first compressional event (D1) around 1.88 Ga represents the main metamorphic event (M1) in the area and was responsible for a strong transposition of potential primary layering and the orebodies and led to the formation of a composite S0/1 fabric. A subsequent F2 folding event around 1.80 Ga resulted in the formation of an open, slightly asymmetric synform with a steeper southeast limb and a roughly SW-plunging fold axis. The result of structural modeling implies that the ore formed at two separate horizons. The folding was accompanied by stretching, resulting in boudinage of the iron orebodies. D2-related high-strain zones and syntectonic granites triggered the remobilization of amphibole, biotite, magnetite, and hematite and controlled the formation of iron oxide-copper-gold (IOCG)-type hydrothermal alteration, including an extensive K-feldspar alteration accompanied with sulfides, scapolite, and epidote. This shows a distinct time gap of at least 80 m.y. between the formation of iron oxides and sulfides. Brittle structures and the lack of an axial planar parallel fabric in conjunction with previous results suggest upper crustal, low-pressure, and high-temperature conditions during this D2 deformation phase, indicating a hydrothermal event rather than a purely regional metamorphic compression. It is proposed in the present study that the Malmberget IOA deposit was deformed and metamorphosed during a 1.88 Ga crustal shortening event. Moreover, the Malmberget IOA deposit was affected by a 1.8 Ga folding and hydrothermal event that is related to a regional IOCG overprint.

Place, publisher, year, edition, pages
Society of Economic Geologists, 2018
Keywords
Palaeoproterozoic, IOA, IOCG, deformation, 3D-modelling
National Category
Geology Metallurgy and Metallic Materials
Research subject
Ore Geology; Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-66455 (URN)10.5382/econgeo.2018.4554 (DOI)000429317200003 ()2-s2.0-85043379790 (Scopus ID)
Projects
Multi-scale 4-dimensional geological modeling of the Gällivare area
Note

Validerad;2018;Nivå 2;2018-03-19 (andbra)

Available from: 2017-11-08 Created: 2017-11-08 Last updated: 2018-11-19Bibliographically approved
Sarlus, Z., Andersson, U. B., Bauer, T. E., Wanhainen, C., Martinsson, O., Nordin, R. & Andersson, J. B. .. (2018). Timing of plutonism in the Gällivare area: mplications for Proterozoic crustal development in the northern Norrbotten ore district, Sweden. Geological Magazine, 155(6), 1351-1376
Open this publication in new window or tab >>Timing of plutonism in the Gällivare area: mplications for Proterozoic crustal development in the northern Norrbotten ore district, Sweden
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2018 (English)In: Geological Magazine, ISSN 0016-7568, E-ISSN 1469-5081, Vol. 155, no 6, p. 1351-1376Article in journal (Refereed) Published
Abstract [en]

Zircon ion probe (secondary-ion mass spectrometry or SIMS) data from a set of intrusive rocks emplaced in the vicinity of major ore bodies, as well as from large igneous intrusions in the Gällivare area, gave the following results: (1) the Dundret ultramafic–mafic layered complex (1883±5 Ma), the Aitik granite (1883±5 Ma), the Nautanen diorite (1870±12 Ma), the Vassaravaara ultramafic–mafic layered complex (1798±4 Ma), the Aitik dolerite (1813±9 Ma), the Bergmästergruvan and Sikträsk syenites (1795±4 Ma and 1801±3 Ma, respectively) and the Naalojärvi granite (1782±5 Ma). These data broadly fall within the ranges 1.89–1.87 Ga (early Svecofennian) and 1.80–1.78 Ga (late Svecofennian), but geochronologically allow further subdivision into pulses at 1885–1880, 1875–1870, 1800 and 1780 Ma. During these events, large layered ultramafic–mafic and felsic plutonic rocks were generated with distinct overlap in time suggesting coeval felsic–mafic magmatism. Results also indicate the presence of inherited c. 1.87 Ga zircon crystals in the plutonic rocks at 1.78 Ga, supporting reworking of the previous crust. These data indicate the importance of mantle-derived mafic underplating in the process of crustal magma generation in the region. The c. 1.88 Ga event that generated ultramafic–mafic layered complexes is tentatively suggested to have played an important role in the formation of the Aitik Cu–Au porphyry system. The later event at c. 1.80 Ga, generating voluminous mafic–felsic units, is suggested to be coupled to the regional iron-oxide-copper-gold (IOCG) overprint.

Place, publisher, year, edition, pages
Cambridge University Press, 2018
National Category
Geology
Research subject
Ore Geology
Identifiers
urn:nbn:se:ltu:diva-63390 (URN)10.1017/S0016756817000280 (DOI)000439690800008 ()2-s2.0-85018356169 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-07-26 (inah)

Available from: 2017-05-17 Created: 2017-05-17 Last updated: 2018-08-15Bibliographically approved
Zainy, M. T., Al-Ansari, N., Bauer, T. & Ask, M. (2017). The Tectonic and Structural Classifications of the Western Part of the Zagros Fold and Thrust Belt, North Iraq, Review and Discussion. Journal of Earth Sciences and Geotechnical Engineering, 7(2), 71-89
Open this publication in new window or tab >>The Tectonic and Structural Classifications of the Western Part of the Zagros Fold and Thrust Belt, North Iraq, Review and Discussion
2017 (English)In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 7, no 2, p. 71-89Article in journal (Refereed) Published
Abstract [en]

The Zagros fold and thrust belt represents a tectonically significant area, and one of the richest areas in oil and gas reservoirs in the world. The Zagros fold and thrust belt is the deformational product of the Cretaceous-present day convergence of the Arabian and Iranian (Eurasian) plates (subduction and collision). The belt extends more than 2000 km from southern Turkey through the north and northeastern Iraq to the Strait of Hormuz in southwestern Iran. The Zagros fold and thrust belt is divided into two parts which are; Western part within Iraqi region and Eastern part within Iranian region. The western part of the Zagros fold and thrust belt has been traditionally subdivided into several structural zones that are generally striking parallel to the plate boundary. This is characterized by exposure of Late Ordovician to Pliocene - Pliestocene formations with different types of Quaternary Sediments. This research will concentrate on Western part of Zagros fold and thrust belt and the styles of structural classifications, which will aid to clarify and better understand the tectonic and structural history and evolution of the region. We have considered the last version of structural classification as the most relevant one to the reality, especially within outer platform (Unstable shelf). Where it divides the region into four structural zones, which are: Low Folded zone, High Folded Zone, Imbricate Zone, and Zagros Suture Zone and these zones were further divided to several subzones. This classification is based on the structural style and intensity of deformation, stratigraphy, mechanicalstratigraphy and tectono-stratigraphy of the deformed sequences, Age of deformation, surface physiography and morphology. The data used in the classification is more reliable, up to date and relevant.

Place, publisher, year, edition, pages
ScienPress Ltd, 2017
Keywords
Tectonic, Classification, Western Zagros Belt, North Iraq
National Category
Geology Geotechnical Engineering
Research subject
Applied Geology; Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-61884 (URN)
Note

Validerad; 2017; Nivå 1; 2017-02-15 (andbra)

Available from: 2017-02-09 Created: 2017-02-09 Last updated: 2018-11-15Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-1627-7058

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