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García-Tudela, M. A., Proenza, J. A., Farré-de-Pablo, J., Aiglsperger, T. H., Pujol-Solà, N. & González-Jiménez, J. M. (2023). A new look to the high-PGE chromitites from the Cabo Ortegal Complex (NW Spain). In: Proceedings of the 17th SGA Biennial Meeting, 28 August – 1 September 2023: . Paper presented at 17th SGA Biennial Meeting "Mineral Resources in a changing world", Zürich, Switzerland, Auguust 28 - September 1, 2023 (pp. 141-144). The Society for Geology Applied to Mineral Deposits (SGA), 3
Open this publication in new window or tab >>A new look to the high-PGE chromitites from the Cabo Ortegal Complex (NW Spain)
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2023 (English)In: Proceedings of the 17th SGA Biennial Meeting, 28 August – 1 September 2023, The Society for Geology Applied to Mineral Deposits (SGA) , 2023, Vol. 3, p. 141-144Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
The Society for Geology Applied to Mineral Deposits (SGA), 2023
National Category
Geochemistry Geology
Research subject
Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-103271 (URN)
Conference
17th SGA Biennial Meeting "Mineral Resources in a changing world", Zürich, Switzerland, Auguust 28 - September 1, 2023
Note

Funder: Spanish Projects (CGL2015–65824, RTI2018-099157-A-I00, PID2019-105625RB-C2);

ISBN for host publication: 978-2-8399-4046-7

Available from: 2023-12-08 Created: 2023-12-08 Last updated: 2023-12-08Bibliographically approved
Zwahlen, C., Rehn, A., Aiglsperger, T. & Dold, B. (2023). Geochemical and mineralogical aspects of acid mine drainage associated with 100 years of coal mining in the arctic, Svalbard (78°N). Journal of Geochemical Exploration, 252, Article ID 107266.
Open this publication in new window or tab >>Geochemical and mineralogical aspects of acid mine drainage associated with 100 years of coal mining in the arctic, Svalbard (78°N)
2023 (English)In: Journal of Geochemical Exploration, ISSN 0375-6742, E-ISSN 1879-1689, Vol. 252, article id 107266Article in journal (Refereed) Published
Abstract [en]

Acid mine drainage (AMD) is a pressing issue due to increasing mining activities in arctic climate zones. Over 100 years of coal mining in Svalbard presents an ideal study case for the development of AMD in arctic regions.

The mined coal (low liptinite type oil prone coal) has less than 1.1 wt% sulphur with micro inclusions of pyrite but the contacting silt and sandstones contain pyrite nodules of centimeter size. These forms of pyrite are left to oxidize on multiple large waste rock piles. Simple accounting of the acid producing and neutralizing potential reveals that all studied lithologies are prone to produce acid waters despite a relatively low pyrite content but with an almost absent neutralization potential.

During spring and summer, there are small streams draining the waste rock piles with a pH of 2.5 to 3.7, buffered by an iron hydroxide assemblage. The sulphate concentration of the water samples correlates well with the sum of the cations, indicating that pyrite oxidation is the dominant weathering process. There is no correlation between the age of the waste rock piles and the acidity of the effluents and the system might be controlled by the geometry of the waste rock piles combined with the local hydrology.

Mass balance calculations for one of the mine sites estimates that AMD will continue for another 150 years. The sole operating mine site to date is likely to face a similar prospect once lime buffering measures seize.

Place, publisher, year, edition, pages
Elsevier B.V., 2023
Keywords
Acid mine drainage, Arctic, Coal mining, Pyrite, Water quality
National Category
Geochemistry
Research subject
Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-99426 (URN)10.1016/j.gexplo.2023.107266 (DOI)001024388700001 ()2-s2.0-85163433838 (Scopus ID)
Funder
Luleå University of Technology
Note

Validerad;2023;Nivå 2;2023-08-10 (joosat);

Licens fulltext: CC BY License

Available from: 2023-08-10 Created: 2023-08-10 Last updated: 2023-08-10Bibliographically approved
García-Tudela, M., Proenza, J., González-Jiménez, J. & Aiglsperger, T. (2023). New observations on PGM assemblages of the anomalously high PGE-rich chromitites from Cabo Ortegal (NW Spain). In: Abstract Volume: 14th International Platinum Symposium, Cardiff, Wales, 4-7 July, 2023. Paper presented at 14th International Platinum Symposium, Cardiff, Wales, Great Britain, July 4-7, 2023 (pp. 286-287). Cardiff University
Open this publication in new window or tab >>New observations on PGM assemblages of the anomalously high PGE-rich chromitites from Cabo Ortegal (NW Spain)
2023 (English)In: Abstract Volume: 14th International Platinum Symposium, Cardiff, Wales, 4-7 July, 2023, Cardiff University , 2023, p. 286-287Conference paper, Oral presentation with published abstract (Other academic)
Place, publisher, year, edition, pages
Cardiff University, 2023
National Category
Geochemistry
Research subject
Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-103092 (URN)
Conference
14th International Platinum Symposium, Cardiff, Wales, Great Britain, July 4-7, 2023
Available from: 2023-11-29 Created: 2023-11-29 Last updated: 2023-11-30Bibliographically approved
Villanova-de-Benavent, C., Proenza, J. A., Torró, L., Aiglsperger, T., Domènech, C., Domínguez-Carretero, D., . . . Rodríguez, J. (2023). REE ultra-rich karst bauxite deposits in the Pedernales Peninsula, Dominican Republic: Mineralogy of REE phosphates and carbonates. Ore Geology Reviews, 157, 105422-105422, Article ID 105422.
Open this publication in new window or tab >>REE ultra-rich karst bauxite deposits in the Pedernales Peninsula, Dominican Republic: Mineralogy of REE phosphates and carbonates
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2023 (English)In: Ore Geology Reviews, ISSN 0169-1368, E-ISSN 1872-7360, Vol. 157, p. 105422-105422, article id 105422Article in journal (Refereed) Published
Abstract [en]

Karst bauxites have recently received renewed attention for their potential as non-conventional REE sources. Karst bauxites from the Pedernales Peninsula in the Dominican Republic stand among the world’s richest in REE. Bauxite ore from two deposits from this bauxite district, Aceitillar and El Turco, have been selected for this study due to their outstanding REE contents and contrasting mineralogy. REE (La to Lu) contents in Aceitillar, range from 0.07 to 0.16 wt%, and Y from 0.01 to 0.13 wt%, whereas El Turco contains between 0.28 and 1.40 wt% REE, and 0.33 to 1.48 wt% Y. The characterisation of REE mineralisation was performed through powder and monocrystal XRD, SEM-EDS, and EMP analyses. REE phosphates and carbonates reveal textural features that suggest significant REE mobilisation and re-deposition within the bauxite profile. The identified REE minerals can be classified into: i) primary monazite(-Ce) and minor monazite(-La); ii) secondary Y- and Nd-dominant phosphates; and iii) secondary Gd- and Nd-carbonates of the (hydroxyl)bastnäsite group. While monazites are ubiquitous in the two studied deposits, secondary phosphates are predominant in El Turco while secondary carbonates are exclusive of Aceitillar. This contrasting mineralogy is explained by the total concentration of carbonate and/or phosphate in the karst bauxite groundwater solutions. REE phosphates are the most stable phases at [CO32−]total/[PO43-]total ≤ 2; whereas REE carbonates are stable at near neutral pH when the total aqueous carbonate concentration is two orders of magnitude higher than that of phosphate. Results of this investigation contribute to a better understanding of the formation REE minerals in the supergene environment and can be applied in REE separation methods.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Rare earth elements (REE), Supergene deposits, Monazite, Secondary REE phosphates, Bastnäsite
National Category
Geochemistry
Research subject
Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-96695 (URN)10.1016/j.oregeorev.2023.105422 (DOI)2-s2.0-85151403021 (Scopus ID)
Projects
PID2019-105625RB-C21 (IP J.A. Pro-enza)
Note

Validerad;2023;Nivå 2;2023-04-21 (sofila);

Funder: MESCYT (Ministry of HigherEducation, Science and Technology of the Dominican Republic) (grant nos. 2014-1B4-133 & 2022-1A4-189)

Available from: 2023-04-21 Created: 2023-04-21 Last updated: 2023-04-21Bibliographically approved
Oğuz-Saka, S., Aydin, F., Karsli, O., Dokuz, A., Aiglsperger, T., Miggins, D. P., . . . Koppers, A. A. .. (2023). Two-stage bimodal volcanism in a Late Cretaceous arc/back-arc setting, NE Turkey: Constraints from volcano-stratigraphy, zircon U–Pb and 40Ar/39Ar geochronology and whole-rock elemental and Sr-Nd-Pb isotope geochemistry. Lithos, 440-441, Article ID 107018.
Open this publication in new window or tab >>Two-stage bimodal volcanism in a Late Cretaceous arc/back-arc setting, NE Turkey: Constraints from volcano-stratigraphy, zircon U–Pb and 40Ar/39Ar geochronology and whole-rock elemental and Sr-Nd-Pb isotope geochemistry
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2023 (English)In: Lithos, ISSN 0024-4937, E-ISSN 1872-6143, Vol. 440-441, article id 107018Article in journal (Refereed) Published
Abstract [en]

The eastern Blacksea magmatic arc (EBMA) in the eastern Sakarya Zone (ESZ) provides an excellent opportunity to investigate birth of an extensional intra-arc and back-arc settings in the Late Cretaceous over the Early Cretaceous northern passive margin of the Neotethys Ocean. Volcano-stratigraphy clearly shows that the Late Cretaceous volcanic activity of the EBMA occurred in two major phases. Bimodality, characterized by mafic/basaltic rocks at the base and felsic/silicic types on top of it, is a typical feature of the lower (LVS) and upper (UVS) volcanic successions in the Giresun region of the ESZ. U–Pb and Ar–Ar ages support the volcanic succession as two-stage (LVS: ca. 92–85 and UVS: ca. 83–67 Ma) bimodal volcanism. Both the volcanic successions are represented by similar rock types consisting of tholeiitic to calc-alkaline basalt-basaltic andesites and calc-alkaline to shoshonitic dacite-rhyolites. Basaltic (M1- and M2-series) and felsic/silicic (F1- and F2-series) samples of the LVS and UVS have an arc-like signature with enriched large ion lithophile elements (LILEs) and light rare earth elements (LREEs) and depleted high field strength elements (HFSEs). Also, the felsic/silicic samples of the F1- and F2-series show prominent negative Sr and Eu anomalies (Eu/Eu* = 0.4 to 0.9), suggesting that plagioclase fractionation played a key role on the evolution of both felsic series. Bimodal rock series in two phases have a wide range of 87Sr/86Sr(i) (0.7048–0.7075) and 143Nd/144Nd(i) (0.5123–0.5127) ratios with variable ɛNd(i) values of −3.8 to +3.0. 206Pb/204Pb(i), 207Pb/204Pb(i) and 208Pb/204Pb(i) isotope ratios of the Giresun volcanic rocks vary in the range of 17.97–18.52, 15.55–15.65 and 37.53–38.56, respectively.

Geochemical and isotopic data suggest that the parental magma of the M1-basaltic rocks were probably derived from a shallow (spinel-bearing) mantle metasomatized by slab/sediment-derived fluids. In contrast, the M2-basalts seem to have been originated from a deeper mantle source (spinel-garnet transition zone) enriched by slab/sediment-derived fluids and hydrous melts (bulk sediment) metasomatism with some contributions of lower/upper crustal materials. The least evolved basaltic samples in two phases are consistent with moderate (∼10–15%) to high degree (∼20–30%) partial melting of the metasomatized mantle. The silicic melts of the F1- and F2-rocks series, on the other hand, were likely derived from melting of lower crustal materials consisting of meta-basalts/andesites and lesser amount of meta-sediments. Subsequently, these melts experienced FC ± AFC and mixing processes during their ascent and emplacement to generate high-silica (rhyolitic) melts. Our data, combined with previous studies, suggest that two-stage bimodal volcanic rocks of the Late Cretaceous in the ESZ were formed in the transition from an extensional continental intra-arc to a back-arc setting during the northward subduction of the northern branch of Neotethys Ocean.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Back-arc, Bimodal volcanism, Eastern Pontide magmatic arc, Late Cretaceous, Mantle-crust interaction, NE Turkey, Sakarya zone
National Category
Geochemistry
Research subject
Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-95562 (URN)10.1016/j.lithos.2023.107018 (DOI)000923896300001 ()2-s2.0-85146662402 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-02-10 (hanlid);

Funder: Scientific and Technological Research Council of Turkey, TUBITAK (112Y365)

Available from: 2023-02-10 Created: 2023-02-10 Last updated: 2023-04-21Bibliographically approved
Jansson, N., Hjorth, I., Ivarsson, F., Aiglsperger, T., Azim Zadeh, A. M., Kooijman, E., . . . Kozub-Budzyń, G. (2022). Cobalt and REE distribution at the Zinkgruvan Zn-Pb-Ag and Cu deposit, Bergslagen, Sweden. In: EGU General Assembly 2022: . Paper presented at EGU General Assembly 2022, Vienna, Austria [Online], May 23–27, 2022. Copernicus GmbH, Article ID EGU22-1067.
Open this publication in new window or tab >>Cobalt and REE distribution at the Zinkgruvan Zn-Pb-Ag and Cu deposit, Bergslagen, Sweden
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2022 (English)In: EGU General Assembly 2022, Copernicus GmbH , 2022, article id EGU22-1067Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

The metamorphosed, stratiform, c. 1.9 Ga Zinkgruvan Zn-Pb-Ag deposit is one of Europe’s largest producers of Zn. Since 2010, disseminated Cu mineralization is also mined from dolomite marble in a hydrothermal vent-proximal position in the stratigraphic footwall. Local enrichments of Co and REE exist in the vent-proximal mineralization types, albeit their distribution is poorly known. This contribution provides new data on the distribution of Co and REE within the Zinkgruvan deposit.

LA-ICP-MS analysis suggest that lattice-bound cobalt in sphalerite range between 44 ppm and 1372 ppm, with the lowest and highest values occurring in distal and proximal mineralization, respectively. Proximal Co-rich sphalerite is always Fe-rich. Lattice-bound Co also occur in pyrrhotite; ranging from 52 ppm in distal ore to 1608 ppm in proximal ore. There is a concurrent increase in lattice-bound Ni from 3 ppm to 529 ppm. In proximal ore, Co is also hosted by cobalt minerals such as costibite (27.37 wt.% Co), safflorite (16.21 wt.% Co), nickeline (7.54 wt.% Co), cobaltite (32.74 wt.% Co) and cobaltpentlandite (25.49 wt.% Co). Automated quantitative mineralogy suggest that these minerals are highly subordinate to sphalerite (<70.11%) and pyrrhotite (<14.69%), amounting to <2.88% cobalt minerals with safflorite being most common (up to 2.67%). Cobalt deportment calculations suggest that the proportion of whole-rock Co that is lattice-bound to sphalerite and pyrrhotite ranges from 7.80% to 100%, with sphalerite being the main host. Whole-rock As and Ni contents pose a strong control on whether Co occurs lattice-bound or as Co minerals.

LA-ICP-MS analysis show that accessory apatite in proximal, marble-hosted Cu mineralization carries a few thousand ppm ∑REE, but locally up to c. 1.6 wt.% ∑REE. The apatite can be subdivided into two types. Type 1 apatite is characterized by dumbbell-shaped chondrite-normalized REE profiles with relative enrichment of in particular Sm-Tb, depletion of Yb-Lu relative to La-Pr, local positive Gd anomalies, and weak positive to negative Eu anomalies. Type 2 apatite is characterized by flat to negatively sloping REE profiles from La to Gd and relative HREE depletion. Additional REE is hosted by monazite. Type 1 apatite was only found as a gangue to Cu mineralization. The Type 1 apatite REE signature is characteristic of hydrothermal apatite, and a direct genetic association with vent-proximal Cu mineralization can be inferred.

Comparison with published REE contents in apatite suggest that vent-proximal Zinkgruvan apatite is locally as REE-rich as apatite from Kiruna-type apatite iron oxide deposits, and more REE-rich than apatite in other metamorphosed sediment-hosted sulphide deposits in the world, such as the Gamsberg deposit (RSA).

Place, publisher, year, edition, pages
Copernicus GmbH, 2022
National Category
Geology
Research subject
Ore Geology; Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-90420 (URN)10.5194/egusphere-egu22-1067 (DOI)
Conference
EGU General Assembly 2022, Vienna, Austria [Online], May 23–27, 2022
Available from: 2022-04-25 Created: 2022-04-25 Last updated: 2023-02-24Bibliographically approved
Farre-de-Pablo, J., Proenza, J. A., Gonzalez-Jimenez, J. M., Aiglsperger, T., Torro, L., Domenech, C. & Garcia-Casco, A. (2022). Low-temperature hydrothermal Pt mineralization in uvarovite-bearing ophiolitic chromitites from the Dominican Republic. Mineralium Deposita, 57(6), 955-976
Open this publication in new window or tab >>Low-temperature hydrothermal Pt mineralization in uvarovite-bearing ophiolitic chromitites from the Dominican Republic
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2022 (English)In: Mineralium Deposita, ISSN 0026-4598, E-ISSN 1432-1866, Vol. 57, no 6, p. 955-976Article in journal (Refereed) Published
Abstract [en]

Platinum-group elements (PGEs) occur in ophiolitic chromitite in the Dominican Republic as platinum-group minerals (PGMs) in spatial association with hydrothermal uvarovite and chromian clinochlore. Bulk-rock total PGE content in a single analyzed chromitite sample is of 6.54 g/t. Three main PGM types are distinguished: euhedral magmatic laurite completely encased in chromite, subhedral to euhedral Ru-Os-Fe-(Ir) compounds partially encased in chromite, and anhedral Pt-Fe-Ni-rich grains exclusively embedded in uvarovite or chromian clinochlore. The Ru-Os-Fe-(Ir) compounds are interpreted as magmatic Ru-Os sulfides that experienced desulfurization during hydrothermal alteration of the chromitites, whereas the Pt-Fe-Ni-rich grains are hydrothermal in origin. We propose a model in which the Pt-Fe-Ni-rich PGMs formed via the accumulation of nanoparticles directly precipitated from the hydrothermal fluids. An estimation of the temperature of crystallization of uvarovite and chromian clinochlore suggests hydrothermal alteration of the chromitite within the thermal range of 150-350 degrees C. Thermodynamic modeling shows that, within this range of temperature, Pt could be mobilized as aqueous bisulfide complexes (HS-) by S-poor, highly reducing hydrothermal fluids originated during serpentinization of the host chromitite rock. The crystallization of Ni sulfides in the chromitite would drop the S concentration of the fluid, causing the precipitation of Pt as native element. Ultimately, this process contributes to constrain the conditions for the genesis of hydrothermal PGE mineralizations in ophiolitic chromitites.

Place, publisher, year, edition, pages
Springer, 2022
Keywords
Platinum-group elements, Platinum-group minerals, Hydrothermal, Serpentinization, Uvarovite, Ophiolitic chromitite
National Category
Geochemistry
Research subject
Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-87632 (URN)10.1007/s00126-021-01079-8 (DOI)000707301300001 ()2-s2.0-85116991302 (Scopus ID)
Note

Validerad;2022;Nivå 2;2022-08-19 (sofila);

For funding information, see: https://doi.org/10.1007/s00126-021-01079-8

Available from: 2021-10-26 Created: 2021-10-26 Last updated: 2022-08-19Bibliographically approved
Domínguez-Carretero, D., Proenza, J. A., González-Jiménez, J. M., Llanes-Castro, A. I., Torres, H., Aiglsperger, T., . . . Garcia-Casco, A. (2022). Ultramafic-hosted volcanogenic massive sulfide deposits from Cuban ophiolites. Journal of South American Earth Sciences, 119, Article ID 103991.
Open this publication in new window or tab >>Ultramafic-hosted volcanogenic massive sulfide deposits from Cuban ophiolites
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2022 (English)In: Journal of South American Earth Sciences, ISSN 0895-9811, E-ISSN 1873-0647, Vol. 119, article id 103991Article in journal (Refereed) Published
Abstract [en]

Ultramafic-hosted volcanogenic massive sulfide deposits (UM-VMS) located in the Havana-Matanzas ophiolite (Cuba) are the only known example of this type of mineralization in the Caribbean realm. UM-VMS from Havana-Matanzas are enriched in Cu, Ni, Co, Au, and Ag. The mineralization consists of massive sulfide bodies mostly composed of pyrrhotite and hosted by serpentinized upper mantle peridotites. Chemical composition of unaltered cores in Cr-spinel grains found within the massive sulfide mineralization and in the peridotite host indicates formation in the fore-arc region of the Greater Antilles volcanic arc. A first stage of serpentinization probably took place prior to the sulfide mineralization event. The UM-VMS mineralization formed by the near-complete replacement of the silicate assemblage of partially serpentinized peridotites underneath the seafloor. The sequence of sulfide mineralization has been divided into two stages. The first stage is characterized by a very reduced hydrothermal mineral assemblage consisting of pyrrhotite, Co–Ni–Fe diarsenides, chalcopyrite, Co-rich pentlandite, and electrum. In the second stage, pyrite and Co–Ni–Fe sulfarsenides partially replaced pyrrhotite and diarsenides, respectively, under a more oxidizing regime during the advanced stages of ongoing serpentinization. The proposed conceptual genetic model presented here can be useful for future exploration targeting this type of deposit in the Caribbean region and elsewhere.

Place, publisher, year, edition, pages
Elsevier, 2022
Keywords
Ultramafic-hosted volcanogenic massive sulfide deposits (UM-VMS), Ophiolite, Cuba, Supra-subduction zone (SSZ), Serpentinization, Gold
National Category
Geology Geosciences, Multidisciplinary
Research subject
Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-92976 (URN)10.1016/j.jsames.2022.103991 (DOI)000856151100001 ()2-s2.0-85137028401 (Scopus ID)
Note

Validerad;2022;Nivå 2;2022-09-12 (joosat);

Funder: MCIN/AEI/10.13039/501100011033 (Grant PID 2019-105625RB-C21); Spanish Ministry of Science and Innovation (PRE 2020-092140); CAP Investigacion PUCP-2022 (2022-A- 0047 [PI0975])

Available from: 2022-09-12 Created: 2022-09-12 Last updated: 2022-11-08Bibliographically approved
Aiglsperger, T., González-Jiménez, J. M., Proenza, J. A., Galí, S., Longo, F., Griffin, W. L. & O’Reilly, S. Y. (2021). Open system Re-Os isotope behavior in platinum-group minerals during laterization?. Minerals, 11(10), Article ID 1083.
Open this publication in new window or tab >>Open system Re-Os isotope behavior in platinum-group minerals during laterization?
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2021 (English)In: Minerals, E-ISSN 2075-163X, Vol. 11, no 10, article id 1083Article in journal (Refereed) Published
Abstract [en]

In this short communication, we present preliminary data on the Re-Os isotopic systematics of platinum-group minerals (PGM) recovered from different horizons in the Falcondo Ni-laterite in the Dominican Republic. The results show differences in the Os-isotope composition in different populations of PGM: (i) pre-lateritic PGM yield 187 Os/188 Os varying from 0.11973 ± 0.00134 to 0.12215 ± 0.00005 (2σ uncertainty) whereas (ii) lateritic PGM are more radiogenic in terms of 187 Os/188 Os (from 0.12390 ± 0.00001 to 0.12645 ± 0.00005; 2σ uncertainty). We suggest that these differences reflect the opening of the Re-Os system in individual grains of PGM during lateritic weathering. The implications of these results are twofold as they will help to (1) elucidate the small-scale mobility of noble metals in the supergene setting and therefore the possible formation of PGM at these very low temperatures, (2) better refine the Os-isotopic datasets of PGM that are currently being used for defining dynamic models of core–mantle separation, crustal generation, and fundamental plate-tectonic processes such as the opening of oceans.

Place, publisher, year, edition, pages
MDPI, 2021
Keywords
Re-Os isotopes, platinum-group minerals, Ni laterite, Dominican Republic
National Category
Geochemistry
Research subject
Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-87444 (URN)10.3390/min11101083 (DOI)000712847400001 ()2-s2.0-85116125573 (Scopus ID)
Note

Validerad;2021;Nivå 2;2021-10-11 (beamah);

Forskningsfinansiärer: Ministerio de Ciencia, Innovación y Universidades (PID2019-105625RB-C21; RTI2018–099157–A–I00); Ramón y Cajal Fellowship (RYC-2015-17596); ARC National Key Centre for Geochemical Evolution and Metallogeny of Continents; ARC Centre of Excellence for Core to Crust Fluid Systems; Centre of Advanced Mining and Metallurgy 

Available from: 2021-10-11 Created: 2021-10-11 Last updated: 2024-01-17Bibliographically approved
Melcher, F., Schwabl, S., Onuk, P., Meisel, T., Aiglsperger, T. & Proenza, J. A. (2021). The Haidbach deposit in the Central Tauern Window, Eastern Alps, Austria: a metamorphosed orthomagmatic Ni-Cu-Co-PGE mineralization in the Polymetallic Ore District Venediger Nappe System – Hollersbach Complex. Austrian Journal of Earth Sciences, 114(1), 1-26
Open this publication in new window or tab >>The Haidbach deposit in the Central Tauern Window, Eastern Alps, Austria: a metamorphosed orthomagmatic Ni-Cu-Co-PGE mineralization in the Polymetallic Ore District Venediger Nappe System – Hollersbach Complex
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2021 (English)In: Austrian Journal of Earth Sciences, ISSN 0251-7493, Vol. 114, no 1, p. 1-26Article in journal (Refereed) Published
Abstract [en]

Cu-Ni-Co-PGE mineralization occurs at Haidbachgraben in the Early Palaeozoic, Subpenninic Hollersbach Complex of the Central Tauern Window, Austria. Massive sulfide ore formed from sulfide melt segregated from silicate melt during intrusion of pyroxenite into magmatic rocks formed in an MORB-type environment. Relics of magmatic minerals include chromian spinel and polyphase sulfide droplets composed of pyrrhotite, chalcopyrite and pentlandite preserved in recrystallized pyrite. Both ore and host rocks were multiply deformed and metamorphosed, leading to hornblendite carrying the ore, enveloped by chlorite-epidote schist. Conditions of – likely Variscan – amphibolite facies metamorphism are documented by relict pargasitic cores in hornblende and actinolite-tremolite, and by ternary sulfarsenide compositions in the Co-Ni-Fe solid solution series that are the most common accessory minerals found in the sulfide ore. Pyrrhotite, pentlandite, chalcopyrite and pyrite are the major sulfide minerals. Chalcopyrite is Cd-rich and retains a high-temperature magmatic signature. High Co/Sb and moderate Se/As ratios in pyrite also point to a magmatic environment of mineralization. The accessory mineral assemblage of small grain size (mostly <10 µm) comprises native Au-Ag alloy and petzite as Au-Ag minerals, sperrylite, a variety of Pd tellurides and bismuthotellurides with elevated Sb, irarsite, and Re sulfides such as tarkianite and a Pb-Re sulfide. In addition, minor molybdenite, bournonite, scheelite and selenides have been identified. Two precious metal assemblages are present in individual samples: (1) hessite associated with Pd tellurides, often accompanied by sphalerite and chalcopyrite; (2) tarkianite forming euhedral inclusions in pyrite. Sperrylite and Au-Ag native alloys are present throughout and were also detected in silicate matrix. Most of the precious metal-bearing phases must have formed during recrystallization of base metal sulfides after the magmatic, and probably during later metamorphic events terminating in the Neoalpine Tauern crystallization.

Place, publisher, year, edition, pages
Walter de Gruyter, 2021
Keywords
Nickel-copper sulfide ore, platinum-group minerals, rhenium sulfide, Hollersbach Complex, orthomagmatic sulfide deposit
National Category
Geochemistry
Research subject
Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-83495 (URN)10.17738/ajes.2021.0001 (DOI)000624565400001 ()2-s2.0-85105833577 (Scopus ID)
Note

Validerad;2021;Nivå 2;2021-04-07 (alebob)

Available from: 2021-04-07 Created: 2021-04-07 Last updated: 2021-05-31Bibliographically approved
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