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  • 1.
    Allen, Rodney
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Montelius, Cecilia
    Schlatter, Denis
    Imana, Marcello
    Barrett, T.
    Svenson, Sven-Åke
    Boliden Mineral AB.
    Application of volcanology to understanding massive sulphide deposits in the 1.9 Ga Skell2004In: The 26th Nordic Geological Winter Meeting: abstract volume / [ed] Joakim Mansfeld, Uppsala: Geological Society of Sweden , 2004, p. 45-Conference paper (Refereed)
  • 2.
    Allen, Rodney
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Montelius, Cecilia
    Svenson, Sven-Åke
    Geology of the Maurliden Area, Central Skellefte District, and Visit to the West Maurliden Zn-Cu-Au Massive Sulfide Deposit: Day three field guide2004In: Svecofennian Ore-Forming Environments Field Trip Volcanic-associated Zn-Cu-Au-Ag and magnetite-apatite, sediment-hosted Pb-Zn, and intrusion-associated Cu-Au deposits in northern Sweden, Littleton, Colorado: Society of Economic Geologists, 2004, p. 111-Chapter in book (Other academic)
  • 3. Montelius, Cecilia
    The genetic relationship between rhyolitic volcanism and Zn-Cu-Au deposits in the Maurliden volcanic centre, Skellefte district, Sweden: volcanic facies, lithogeochemistry and geochronology2005Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The Skellefte district is one of three major ore provinces in Sweden and contains more than 80 Zn-Cu-Au-Ag massive sulphide deposits. The Maurliden area in the central part of the district represents a subaqueous, constructional and relatively topographic high silicic volcanic centre. It hosts four sulphide deposits and was active during around 1885 Ma. The tholeiitic to transitional Maurliden volcanic centre developed in an extensional arc region in the Skellefte district that probably developed on an immature (relatively thin) continental arc crust. The four Maurliden Zn- Cu-Au massive to stringer sulphide deposits are hosted within the same quartz-feldspar porphyritic pumice breccia-sandstone unit (QFP pumice unit) and were formed by replacement and infilling of this unit together with seafloor precipitation/exhalation. The QFP pumice unit was generated by explosive subaqueous eruptions and was sedimented on the seafloor as a succession of subaqueous mass-flow pulses. Field relationships and geochemistry indicate a close relationship between massive sulphide deposition and host rock in composition, intensity of volcanism and sedimentation during the evolution of the Maurliden volcanic centre. The volcanic activity before ore deposition was dominated by felsic extrusive volcanism associated with both terrestrial to shallow marine breccia-conglomerates and siltstone-sandstone turbidites deposited below wave base. At the same time or slightly after this stage, there was a stage of quartz-feldspar porphyritic rhyolitic extrusive and explosive volcanism. At this stage the ore-host, the QFP pumice unit, was subaqeously erupted and emplaced. The waning stage of the felsic volcanic activity was accompanied by deposition of massive sulphide and siltstone-sandstone. Most mafic rocks are post-ore dykes. The similar geochemical composition of the felsic rocks suggests that they were derived from a common magma source. Trace element and rare earth element characteristics suggest that these magmas were relatively primitive. The coeval felsic volcanic activity and the strong facies control on massive sulphide deposition, suggest that massive sulphide deposition was intimately linked to the magmatic evolution of the Maurliden volcanic centre. The QFP pumice unit has a strong control on the location of sulfide mineralization in the Maurliden area, and represents a new VMS horizon in the central Skellefte district and it is possible that this horizon occurs in other unexplored parts of the Maurliden domain.

  • 4.
    Montelius, Cecilia
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Volcanology of the paleoproterozoic Maurliden area and its four unusual massive sulphide deposits, Skellefteå district, Sweden2001Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The Skellefte district is one of three major ore provinces in Sweden and contains more than 85 Zn-Cu-Au-Ag massive sulphide deposits. The Maurliden area is situated in the central part of the district and is a subaqueous volcanic dominated area with four Zn-Pb-Cu-Au-Ag sulphide deposits. The stratigraphy is characterised by felsic coherent intrusions, lavas and their clastic facies, sulphide mineralisations and fine to coarse grained stratified to graded volcaniclastic sedimentary rocks. Facies analysis of the Maurliden domain involving mapping and drillcore logging in a number of areas, but mainly in the central mineralised part where most drill-cores and outcrops occur, has led to a better understanding of the palaeovolcanology. Coherent felsic intrusions, lavas and their clastic facies and minor sedimentary and mafic rocks characterize the area. These rocks are tightly to closely upright folded and the massive sulphide deposits are situated in the northern and southern limbs of a major synform. The principal sedimentary facies are; 1) mudstone and sandstone turbidites; 2) pebbly sandstone and sand to siltstone turbidites; 3) graded to stratified breccia/conglomerate and 4) locally derived breccia/conglomerates. The volcanic and sedimentary facies together reflect a dynamic interplay between subsidence and uplift and between volcanism and tectonism. This resulted in adjacent and juxtaposed deep and shallow water depositional environments at different stratigraphic levels. The four massive to network sulphide deposits occur in and above stratigraphic intervals containing sedimentary facies emplaced below wave base, but shallow water facies are widespread and occur close to and stratigraphically below the mineralizations. Based on field relationships, petrographic and textural evidence are all four Maurliden mineralizations interpreted to be hosted in the same strongly quartz-feldspar porphyritic rhyolite. Intrusive contact relationships and high crystal content of this rhyolite suggest that it is an intrusion. The Maurliden sulfide deposits show several features typical of seafloor VHMS such as well-developed stringer zones, metal zonation, potential ore bearing sub-aqueous sedimentary horizon, colloform pyrite and polymetallic composition. However, other features such as intrusive host facies, extensive hydrothermal brecciation, disseminated and vein mineralizations are more typical of porphyry and high sulfidation deposits. The Maurliden deposits with all these different features form a transition between these hydrothermal end members.

  • 5. Montelius, Cecilia
    et al.
    Allen, Rodney
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Crystal-rich Rhyolitic Pumice Flows and Domes: Evidence for Submarin Explosive and Extrusive Volcanism in the 1.9 Ga Maurliden Volcanic Centre, Skellefte District, Sweden2004Conference paper (Refereed)
  • 6. Montelius, Cecilia
    et al.
    Allen, Rodney
    Svenson, S. A.
    Weihed, Pär
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    The Maurliden volcanogenic Zn-Cu-Au-Ag massive- and network-sulfide deposits, Skellefte District, Sweden2000In: Volcanic environments and massive sulfide deposits / [ed] J. Bruce Gemmell; June Pongratz, Hobart: Colonialism and its Aftermath, University of Tasmania, 2000, p. 135-136Conference paper (Other academic)
  • 7. Montelius, Cecilia
    et al.
    Allen, Rodney
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Svenson, S. Å.
    Weihed, Pär
    Volcanology of a palaeoproterozoic shallow marine region with unusual massive sulphide deposits: potential for a gold-bearing system, Maurliden, Skellefte district, Sweden1999In: Gold 99 Trondheim: Precambrian gold in the Fennoscandian and Ukrainian shields and related areas : abstract volume / [ed] Nigel J. Cook; Krister Sundblad, Trondheim: American Speech-Language-Hearing Association, 1999, p. 123-124Conference paper (Other academic)
  • 8. Montelius, Cecilia
    et al.
    Allen, Rodney
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Svenson, Sven-Åke
    Boliden Mineral AB.
    Weihed, Pär
    Facies architecture of the Palaeoproterozoic VMS-bearing Maurliden volcanic centre, Skellefte district, Sweden2007In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 129, no 3, p. 177-196Article in journal (Refereed)
    Abstract [en]

    The four Maurliden massive to network sulphide deposits are hosted by a silicic volcanic succession in the Palaeoproterozoic Maurliden domain in the central part of the Skellefte district, northern Sweden. The bedrock in the Maurliden domain can be divided into primary volcanic rocks and volcaniclastic sedimentary rocks. The primary volcanic rocks comprise coherent rhyolitic, dacitic, andesitic and mafic volcanic facies and their related autoclastic and pumiceous breccia facies. The volcaniclastic sedimentary rocks include monomict to slightly polymict breccia-conglomerates, which are related to terrestrial to shallow marine erosion of domes, and sandstone turbidites and mudstones, which indicate submarine settings below wave base. The primary volcanic rocks and volcaniclastic sedimentary rocks collectively define a submarine volcanic centre. This volcanic centre was characterized by the emplacement of rhyolitic domes and cryptodomes, accompanied by subordinate explosive activity. It was developed in the ensialic back-arc or intra-arc basin of the Skellefte district. The facies architecture shows that prior to massive sulphide deposition, feldspar porphyritic rhyolitic volcanism, and both terrestrial/shallow marine and below wave base environments characterized the volcanic centre. At the time of massive sulphide deposition the Maurliden volcanic centre was characterized by quartz-feldspar porphyritic rhyolite volcanism and below wave base environment. This volcanism resulted in strongly quartz-feldspar porphyritic rhyolite cryptodomes, domes and quartz-feldspar porphyritic pumice breccia-sandstone (QFP pumice unit). The QFP pumice unit erupted explosively and was rapidly sedimented on the sea floor as a series of subaqueous mass-flows. All four Maurliden sulphide deposits are hosted within this QFP pumice unit, which suggest a genetic connection between eruption of the QFP pumice unit and formation of the sulphide deposits.

  • 9. Montelius, Cecilia
    et al.
    Allen, Rodney
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Svenson, Sven-Åke
    Weihed, Pär
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Intrusion-Hosted, Polymetallic Massive and Network Sulfide Deposits, Maurliden, Skellefte District, Sweden2004In: Svecofennian Ore-Forming Environments Field Trip Volcanic-associated Zn-Cu-Au-Ag and magnetite-apatite, sediment-hosted Pb-Zn, and intrusion-associated Cu-Au deposits in northern Sweden, Littleton, Colorado: Society of Economic Geologists, 2004, p. 95-Chapter in book (Other academic)
1 - 9 of 9
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