Diverse metal sources of Archean gold deposits: evidence from in situ lead-isotope analysis of individual grains of galena and altaite in the Ross and Kirkland Lake deposits, Abitibi Greenstone belt, Canada
Article Abstract:
Individual samples of galena and altaite were subjected to in situ analyses using a secondary ion mass spectrometer. The samples were collected from Archean gold-bearing veins of the Ross deposit and Kirkland Lake deposit, both of the Abitibi Greenstone belt in Canada. Lead-isotope compositions of the two minerals were determined in order to identify the sources of metals, specifically gold, and to develop genetic models for their mineralization. The different isotopic characteristics of the two deposits discounted the possibility of a common metal source but suggested that most of the gold were leached from upper crustal rocks during the fluid ascent.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1993
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Sources of continental magmatism adjacent to the late Archean Kolar Suture Zone, south India: distinct isotopic and elemental signatures of two late Archean magmatic series
Article Abstract:
A study shows that late Archean mantle-derived magmas are present in the gneisses on the west side of the Kolar Schist Belt, south India. The formation involves interaction with middle Archean crustal rocks. Similar magmas are absent in the east side gneisses. The tectonic setting of the rocks is similar to that in the Phanerozoic. The distinct isotopic data of the east and west terranes suggest that they originate from different regions.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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IIb trioctahedral chlorite from the Barberton greenstone belt: crystal structure and rock composition constraints with implications to geothermometry
Article Abstract:
The rock influence and structural constraints on the chemical composition of IIb trioctahedral chlorite from the Barberton greenstone belt are studied. Results show substantial chemical variability in IIb trioctahedral chlorite from ferrous clinochlore to magnesian-alumanian chamosite. The bulk rock influence on the chemical composition of chlorite is also represented by MgORock and the presence of other Al-bearing phases.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1997
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