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The controls on the formation of gold-bearing hydrothermal quartz veins at the Bleka Concession, Telemark, Norway

The controls on the formation of gold-bearing hydrothermal quartz veins at the Bleka Concession,... APPLIED EARTH SCIENCE 85 Discriminating porphyry and endoskarn-forming magmatic-hydrothermal systems in the Daye district, China F. Zhang, B.J. Williamson and H.S.R. Hughes Camborne School of Mines, University of Exeter, Penryn, Cornwall Porphyry magmatic systems emplaced within carbon- alteration (replacement of plagioclase with K-feldspar), ate host rocks constitute a major source of the world’s and later quartz-calcite veining. The endoskarn, which Cu, Mo, Pb, Zn and Au (Sillitoe 2010). Mineralisation shows relict minerals and textures from the granite, is generally either porphyry-style or endoskarn-style underwent: 1) sericitic alteration, 2) prograde endos- within, or porphyry-, exoskarn- or manto-style outside karn formation, 3) retrograde endoskarn formation, the porphyry intrusion(s) (Sillitoe 2010; Meinert et al. and 4) Na-K-Ca metasomatism. Stage 1, sericite repla- 2005). Genetic models for porphyry and skarn miner- cing feldspar, is tentatively suggested to have resulted alisation are well established, however questions from the mixing of CO , derived from wall-rock de-car- remain as to why endoskarn- rather than porphyry- bonation, with magmatic-hydrothermal fluids, to pro- style mineralisation predominates within certain sys- duce the required acid (Lentz 2005). Stage 2 is tems and regions. Recent studies show that magmas characterised by diopside, granditic garnet, intermedi- can assimilate large volumes of http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Earth Science Taylor & Francis

The controls on the formation of gold-bearing hydrothermal quartz veins at the Bleka Concession, Telemark, Norway

Bishop, C. S.; Jenkin, G. R. T.; Duckworth, D.
Applied Earth Science , Volume 129 (2): 2 – Apr 2, 2020
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The controls on the formation of gold-bearing hydrothermal quartz veins at the Bleka Concession, Telemark, Norway

Abstract

APPLIED EARTH SCIENCE 85 Discriminating porphyry and endoskarn-forming magmatic-hydrothermal systems in the Daye district, China F. Zhang, B.J. Williamson and H.S.R. Hughes Camborne School of Mines, University of Exeter, Penryn, Cornwall Porphyry magmatic systems emplaced within carbon- alteration (replacement of plagioclase with K-feldspar), ate host rocks constitute a major source of the world’s and later quartz-calcite veining. The endoskarn, which Cu, Mo, Pb, Zn and Au (Sillitoe...
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Publisher
Taylor & Francis
Copyright
© 2019 Institute of Materials, Minerals and Mining and The AusIMM
ISSN
2572-6838
eISSN
2572-6846
DOI
10.1080/25726838.2019.1599198
Publisher site
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Abstract

APPLIED EARTH SCIENCE 85 Discriminating porphyry and endoskarn-forming magmatic-hydrothermal systems in the Daye district, China F. Zhang, B.J. Williamson and H.S.R. Hughes Camborne School of Mines, University of Exeter, Penryn, Cornwall Porphyry magmatic systems emplaced within carbon- alteration (replacement of plagioclase with K-feldspar), ate host rocks constitute a major source of the world’s and later quartz-calcite veining. The endoskarn, which Cu, Mo, Pb, Zn and Au (Sillitoe 2010). Mineralisation shows relict minerals and textures from the granite, is generally either porphyry-style or endoskarn-style underwent: 1) sericitic alteration, 2) prograde endos- within, or porphyry-, exoskarn- or manto-style outside karn formation, 3) retrograde endoskarn formation, the porphyry intrusion(s) (Sillitoe 2010; Meinert et al. and 4) Na-K-Ca metasomatism. Stage 1, sericite repla- 2005). Genetic models for porphyry and skarn miner- cing feldspar, is tentatively suggested to have resulted alisation are well established, however questions from the mixing of CO , derived from wall-rock de-car- remain as to why endoskarn- rather than porphyry- bonation, with magmatic-hydrothermal fluids, to pro- style mineralisation predominates within certain sys- duce the required acid (Lentz 2005). Stage 2 is tems and regions. Recent studies show that magmas characterised by diopside, granditic garnet, intermedi- can assimilate large volumes of

Journal

Applied Earth Science – Taylor & Francis

Published: Apr 2, 2020

References