scholarly journals Vein Mineral Zoning in the Mines Gaspe, Ore System, Gaspe, Quebec

1989 ◽  
Author(s):  
K Stevens
Keyword(s):  
Vein Mineral ◽  
Mineral Zoning

scholarly journals Biosignatures of ancient microbial life are present across the igneous crust of the Fennoscandian shield

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Henrik Drake ◽  
Nick M. W. Roberts ◽  
Manuel Reinhardt ◽  
Martin Whitehouse ◽  
Magnus Ivarsson ◽  
...  
Keyword(s):  
Fennoscandian Shield ◽  
Stable Carbon ◽  
Deep Biosphere ◽  
Isotopic Signatures ◽  
Microbial Life ◽  
Carbon Isotopic ◽  
Terrestrial Life ◽  
Vein Mineral ◽  
Methyl Branched Fatty Acids

AbstractEarth’s crust contains a substantial proportion of global biomass, hosting microbial life up to several kilometers depth. Yet, knowledge of the evolution and extent of life in this environment remains elusive and patchy. Here we present isotopic, molecular and morphological signatures for deep ancient life in vein mineral specimens from mines distributed across the Precambrian Fennoscandian shield. Stable carbon isotopic signatures of calcite indicate microbial methanogenesis. In addition, sulfur isotope variability in pyrite, supported by stable carbon isotopic signatures of methyl-branched fatty acids, suggest subsequent bacterial sulfate reduction. Carbonate geochronology constrains the timing of these processes to the Cenozoic. We suggest that signatures of an ancient deep biosphere and long-term microbial activity are present throughout this shield. We suggest that microbes may have been active in the continental igneous crust over geological timescales, and that subsurface investigations may be valuable in the search for extra-terrestrial life.

Mineralogy, paragenesis, and mineral zoning of the West Fork Mine, Virburnum Trend, Southeast Missouri

1992 ◽  
Vol 87 (1) ◽  
pp. 113-124 ◽  
Author(s):  
John A. Mavrogenes ◽  
Richard D. Hagni ◽  
Paul R. Dingess
Keyword(s):  
The West ◽  
West Fork ◽  
Southeast Missouri ◽  
Mineral Zoning

scholarly journals Mineral zoning and gold occurrence in the Fortuna skarn mine, Nambija district, Ecuador

2006 ◽  
Vol 41 (4) ◽  
pp. 301-321 ◽  
Author(s):  
Agnès Markowski ◽  
Jean Vallance ◽  
Massimo Chiaradia ◽  
Lluìs Fontboté
Keyword(s):  
Gold Occurrence ◽  
Mineral Zoning

Mineral zoning in the New Jersey-Pennsylvania-Virginia Triassic area

1933 ◽  
Vol 28 (7) ◽  
pp. 613-633 ◽  
Author(s):  
Walter Harry Newhouse
Keyword(s):  
New Jersey ◽  
Mineral Zoning
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