3D modelling and sheath folding at the Falun Zn-Pb-Cu-(Au-Ag) massive sulphide deposit and implications for exploration in a 1.9 Ga ore district, Fennoscandian Shield, Sweden
The Falun pyritic Zn-Pb-Cu-(Au-Ag) deposit, situated in the Palaeoproterozoic (1.9–1.8 Ga) Bergslagen lithotectonic unit in the south-western part of the Fennoscandian Shield, is one of the major base metal sulphide deposits in Sweden. Altered rocks and ore types at Falun have been metamorphosed and...
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Luleå tekniska universitet, Geovetenskap och miljöteknik
2016
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ftluleatu:oai:DiVA.org:ltu-9197 2023-05-15T16:12:56+02:00 3D modelling and sheath folding at the Falun Zn-Pb-Cu-(Au-Ag) massive sulphide deposit and implications for exploration in a 1.9 Ga ore district, Fennoscandian Shield, Sweden Kampmann, Tobias Christoph Stephens, Michael Weihed, Pär 2016 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-9197 https://doi.org/10.1007/s00126-016-0638-z eng eng Luleå tekniska universitet, Geovetenskap och miljöteknik Mineralium Deposita, 0026-4598, 2016, 51:5, s. 665-680 http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-9197 doi:10.1007/s00126-016-0638-z ISI:000377024500007 Scopus 2-s2.0-84955598369 Local 7c293c1b-cd76-47eb-85c5-e1cf3a56f6d9 info:eu-repo/semantics/openAccess Geology Geologi Article in journal info:eu-repo/semantics/article text 2016 ftluleatu https://doi.org/10.1007/s00126-016-0638-z 2022-10-25T20:54:37Z The Falun pyritic Zn-Pb-Cu-(Au-Ag) deposit, situated in the Palaeoproterozoic (1.9–1.8 Ga) Bergslagen lithotectonic unit in the south-western part of the Fennoscandian Shield, is one of the major base metal sulphide deposits in Sweden. Altered rocks and ore types at Falun have been metamorphosed and deformed in a heterogeneous ductile manner, strongly modifying mineral assemblages in the original hydrothermal alteration system and the geometry of the deposit. Using a combined methodological approach, including surface mapping of lithologies and structures, drill core logging and microstructural investigation, the polyphase character (D1 and D2) of the ductile deformation is demonstrated and a 3D model for the deposit created. F2 sheath folding along axes that plunge steeply to the south-south-east, parallel to a mineral stretching lineation and the dip direction of the S2 foliation, is suggested as a key deformation mechanism forming steeply plunging, rod-shaped ore bodies. This is in contrast to previous structural models involving fold interference and, in turn, has implications for near-mine exploration, the occurrence of hanging-wall components to the ore body being questioned. Typical rock-forming minerals in the Falun alteration aureole include quartz, biotite/phlogopite, cordierite, anthophyllite and minor almandine, andalusite and chlorite, as well as dolomite, tremolite and actinolite. Where observable, the silicate minerals in the alteration rocks show growth patterns during different phases of the tectonothermal evolution, considerable static grain growth occurring between D1 and D2 and even after D2. A major high-strain zone, characterized by the mineral assemblage talc-chlorite-(quartz-biotite/phlogopite) defines a boundary between northern and southern structural domains at the deposit, and is closely spatially associated with the polymetallic massive sulphide ores. A possible role as a metal-bearing fluid conduit during ore genesis is discussed. Validerad; 2016; Nivå 2; 20150212 (tobkam) ... Article in Journal/Newspaper Fennoscandian Luleå University of Technology Publications (DiVA) Mineralium Deposita 51 5 665 680 |
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Luleå University of Technology Publications (DiVA) |
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language |
English |
topic |
Geology Geologi |
spellingShingle |
Geology Geologi Kampmann, Tobias Christoph Stephens, Michael Weihed, Pär 3D modelling and sheath folding at the Falun Zn-Pb-Cu-(Au-Ag) massive sulphide deposit and implications for exploration in a 1.9 Ga ore district, Fennoscandian Shield, Sweden |
topic_facet |
Geology Geologi |
description |
The Falun pyritic Zn-Pb-Cu-(Au-Ag) deposit, situated in the Palaeoproterozoic (1.9–1.8 Ga) Bergslagen lithotectonic unit in the south-western part of the Fennoscandian Shield, is one of the major base metal sulphide deposits in Sweden. Altered rocks and ore types at Falun have been metamorphosed and deformed in a heterogeneous ductile manner, strongly modifying mineral assemblages in the original hydrothermal alteration system and the geometry of the deposit. Using a combined methodological approach, including surface mapping of lithologies and structures, drill core logging and microstructural investigation, the polyphase character (D1 and D2) of the ductile deformation is demonstrated and a 3D model for the deposit created. F2 sheath folding along axes that plunge steeply to the south-south-east, parallel to a mineral stretching lineation and the dip direction of the S2 foliation, is suggested as a key deformation mechanism forming steeply plunging, rod-shaped ore bodies. This is in contrast to previous structural models involving fold interference and, in turn, has implications for near-mine exploration, the occurrence of hanging-wall components to the ore body being questioned. Typical rock-forming minerals in the Falun alteration aureole include quartz, biotite/phlogopite, cordierite, anthophyllite and minor almandine, andalusite and chlorite, as well as dolomite, tremolite and actinolite. Where observable, the silicate minerals in the alteration rocks show growth patterns during different phases of the tectonothermal evolution, considerable static grain growth occurring between D1 and D2 and even after D2. A major high-strain zone, characterized by the mineral assemblage talc-chlorite-(quartz-biotite/phlogopite) defines a boundary between northern and southern structural domains at the deposit, and is closely spatially associated with the polymetallic massive sulphide ores. A possible role as a metal-bearing fluid conduit during ore genesis is discussed. Validerad; 2016; Nivå 2; 20150212 (tobkam) ... |
format |
Article in Journal/Newspaper |
author |
Kampmann, Tobias Christoph Stephens, Michael Weihed, Pär |
author_facet |
Kampmann, Tobias Christoph Stephens, Michael Weihed, Pär |
author_sort |
Kampmann, Tobias Christoph |
title |
3D modelling and sheath folding at the Falun Zn-Pb-Cu-(Au-Ag) massive sulphide deposit and implications for exploration in a 1.9 Ga ore district, Fennoscandian Shield, Sweden |
title_short |
3D modelling and sheath folding at the Falun Zn-Pb-Cu-(Au-Ag) massive sulphide deposit and implications for exploration in a 1.9 Ga ore district, Fennoscandian Shield, Sweden |
title_full |
3D modelling and sheath folding at the Falun Zn-Pb-Cu-(Au-Ag) massive sulphide deposit and implications for exploration in a 1.9 Ga ore district, Fennoscandian Shield, Sweden |
title_fullStr |
3D modelling and sheath folding at the Falun Zn-Pb-Cu-(Au-Ag) massive sulphide deposit and implications for exploration in a 1.9 Ga ore district, Fennoscandian Shield, Sweden |
title_full_unstemmed |
3D modelling and sheath folding at the Falun Zn-Pb-Cu-(Au-Ag) massive sulphide deposit and implications for exploration in a 1.9 Ga ore district, Fennoscandian Shield, Sweden |
title_sort |
3d modelling and sheath folding at the falun zn-pb-cu-(au-ag) massive sulphide deposit and implications for exploration in a 1.9 ga ore district, fennoscandian shield, sweden |
publisher |
Luleå tekniska universitet, Geovetenskap och miljöteknik |
publishDate |
2016 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-9197 https://doi.org/10.1007/s00126-016-0638-z |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_relation |
Mineralium Deposita, 0026-4598, 2016, 51:5, s. 665-680 http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-9197 doi:10.1007/s00126-016-0638-z ISI:000377024500007 Scopus 2-s2.0-84955598369 Local 7c293c1b-cd76-47eb-85c5-e1cf3a56f6d9 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s00126-016-0638-z |
container_title |
Mineralium Deposita |
container_volume |
51 |
container_issue |
5 |
container_start_page |
665 |
op_container_end_page |
680 |
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1765998545102438400 |