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

1989 ◽  
Author(s):  
K Stevens
Keyword(s):  
2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Henrik Drake ◽  
Nick M. W. Roberts ◽  
Manuel Reinhardt ◽  
Martin Whitehouse ◽  
Magnus Ivarsson ◽  
...  

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.


1992 ◽  
Vol 87 (1) ◽  
pp. 113-124 ◽  
Author(s):  
John A. Mavrogenes ◽  
Richard D. Hagni ◽  
Paul R. Dingess

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

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

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