Hydrothermal evolution of volcanogenic Zn-Cu-Pb deposits, Taylors Brook showing, Stirling Belt, southeastern Cape Breton Island, Nova Scotia
1 online resource (vi, 64 p.) : ill. (chiefly col.), col. maps Includes abstract and appendices. Includes bibliographical references (p. 50-54). The Taylors Brook showing is a suspected volcanogenic massive sulfide (VMS) occurrence (Zn-Pb-Cu-Au-Ag) that occurs within the ~680 Ma Stirling volcanosedi...
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ftstmarysunivca:oai:library2:01/26619 2023-05-15T15:46:44+02:00 Hydrothermal evolution of volcanogenic Zn-Cu-Pb deposits, Taylors Brook showing, Stirling Belt, southeastern Cape Breton Island, Nova Scotia LeBlanc, Haley D. Hanley, Jacob James, 1976- Nova Scotia 2016 application/pdf http://library2.smu.ca/handle/01/26619 en eng Halifax, N.S. : Saint Mary's University http://library2.smu.ca/handle/01/26619 Text 2016 ftstmarysunivca 2022-05-13T05:44:42Z 1 online resource (vi, 64 p.) : ill. (chiefly col.), col. maps Includes abstract and appendices. Includes bibliographical references (p. 50-54). The Taylors Brook showing is a suspected volcanogenic massive sulfide (VMS) occurrence (Zn-Pb-Cu-Au-Ag) that occurs within the ~680 Ma Stirling volcanosedimentary-plutonic belt, southeastern Cape Breton Island, Nova Scotia, Canada. In addition to mineralized mudstones, there are 7 associated hydrothermal vein types, characterized using three criteria: vein-filling mineral composition and alteration style, cross cutting relationships and mineralization. Mineralized (Zn-Cu-Pb-Sc-Y-Ag-Te) veins show propylitic and potassic alteration assemblages. Compositional zoning in epidote and a pyrrhotite-smythite replacement reaction indicate that the hydrothermal fluid was experiencing fluctuations in /O2 and cooling, respectively, rendering the metals less soluble causing their precipitation. Bulk rock geochemistry indicates mineralization anomalies are associated with host rock Zn-Pb anomalies in pyritic mudstone units and Cu anomalies in type IA (epidote-actinolite-calcite-K-feldspar-quartz-pyrite) veins. Fluid inclusion data from two generations of calcite in later type V veins suggest a CaCl2-rich hydrothermal brine responsible for metal transport and deposition with bulk salinities ranging between 43-54 wt% total salt (absolute: 33-50 wt% CaCl2 and up to 20 wt % NaCl). The homogenization temperatures for calcite A-hosted inclusions range from 106-306[degree]C (n=21) and in calcite B-hosted inclusions from 212-331[degree]C (n=91). Isochore ranges were plotted using microthermometric data, paired with a po-py equilibrium boundary constraint limits trapping conditions to a maximum of 400[degree]C and 5kbar. The distinct Ca-Cl-rich brine composition can only be formed naturally under specific conditions. There are four conceivable explanations for this Ca rich fluid: boiling, cation exchange between Na and Ca, evaporation of Ca-rich paleoseawater and dissolution of ... Text Breton Island Saint Mary's University, Halifax: Institutional Repository Canada Breton Island ENVELOPE(141.383,141.383,-66.800,-66.800) Stirling ENVELOPE(164.117,164.117,-71.550,-71.550) Taylors Brook ENVELOPE(-57.098,-57.098,49.550,49.550) |
institution |
Open Polar |
collection |
Saint Mary's University, Halifax: Institutional Repository |
op_collection_id |
ftstmarysunivca |
language |
English |
description |
1 online resource (vi, 64 p.) : ill. (chiefly col.), col. maps Includes abstract and appendices. Includes bibliographical references (p. 50-54). The Taylors Brook showing is a suspected volcanogenic massive sulfide (VMS) occurrence (Zn-Pb-Cu-Au-Ag) that occurs within the ~680 Ma Stirling volcanosedimentary-plutonic belt, southeastern Cape Breton Island, Nova Scotia, Canada. In addition to mineralized mudstones, there are 7 associated hydrothermal vein types, characterized using three criteria: vein-filling mineral composition and alteration style, cross cutting relationships and mineralization. Mineralized (Zn-Cu-Pb-Sc-Y-Ag-Te) veins show propylitic and potassic alteration assemblages. Compositional zoning in epidote and a pyrrhotite-smythite replacement reaction indicate that the hydrothermal fluid was experiencing fluctuations in /O2 and cooling, respectively, rendering the metals less soluble causing their precipitation. Bulk rock geochemistry indicates mineralization anomalies are associated with host rock Zn-Pb anomalies in pyritic mudstone units and Cu anomalies in type IA (epidote-actinolite-calcite-K-feldspar-quartz-pyrite) veins. Fluid inclusion data from two generations of calcite in later type V veins suggest a CaCl2-rich hydrothermal brine responsible for metal transport and deposition with bulk salinities ranging between 43-54 wt% total salt (absolute: 33-50 wt% CaCl2 and up to 20 wt % NaCl). The homogenization temperatures for calcite A-hosted inclusions range from 106-306[degree]C (n=21) and in calcite B-hosted inclusions from 212-331[degree]C (n=91). Isochore ranges were plotted using microthermometric data, paired with a po-py equilibrium boundary constraint limits trapping conditions to a maximum of 400[degree]C and 5kbar. The distinct Ca-Cl-rich brine composition can only be formed naturally under specific conditions. There are four conceivable explanations for this Ca rich fluid: boiling, cation exchange between Na and Ca, evaporation of Ca-rich paleoseawater and dissolution of ... |
author2 |
Hanley, Jacob James, 1976- |
format |
Text |
author |
LeBlanc, Haley D. |
spellingShingle |
LeBlanc, Haley D. Hydrothermal evolution of volcanogenic Zn-Cu-Pb deposits, Taylors Brook showing, Stirling Belt, southeastern Cape Breton Island, Nova Scotia |
author_facet |
LeBlanc, Haley D. |
author_sort |
LeBlanc, Haley D. |
title |
Hydrothermal evolution of volcanogenic Zn-Cu-Pb deposits, Taylors Brook showing, Stirling Belt, southeastern Cape Breton Island, Nova Scotia |
title_short |
Hydrothermal evolution of volcanogenic Zn-Cu-Pb deposits, Taylors Brook showing, Stirling Belt, southeastern Cape Breton Island, Nova Scotia |
title_full |
Hydrothermal evolution of volcanogenic Zn-Cu-Pb deposits, Taylors Brook showing, Stirling Belt, southeastern Cape Breton Island, Nova Scotia |
title_fullStr |
Hydrothermal evolution of volcanogenic Zn-Cu-Pb deposits, Taylors Brook showing, Stirling Belt, southeastern Cape Breton Island, Nova Scotia |
title_full_unstemmed |
Hydrothermal evolution of volcanogenic Zn-Cu-Pb deposits, Taylors Brook showing, Stirling Belt, southeastern Cape Breton Island, Nova Scotia |
title_sort |
hydrothermal evolution of volcanogenic zn-cu-pb deposits, taylors brook showing, stirling belt, southeastern cape breton island, nova scotia |
publisher |
Halifax, N.S. : Saint Mary's University |
publishDate |
2016 |
url |
http://library2.smu.ca/handle/01/26619 |
op_coverage |
Nova Scotia |
long_lat |
ENVELOPE(141.383,141.383,-66.800,-66.800) ENVELOPE(164.117,164.117,-71.550,-71.550) ENVELOPE(-57.098,-57.098,49.550,49.550) |
geographic |
Canada Breton Island Stirling Taylors Brook |
geographic_facet |
Canada Breton Island Stirling Taylors Brook |
genre |
Breton Island |
genre_facet |
Breton Island |
op_relation |
http://library2.smu.ca/handle/01/26619 |
_version_ |
1766381444192534528 |