Early Paleoproterozoic–Archean dykes and gneisses in Russian Karelia of the Fennoscandian Shield—New paleomagnetic, isotope age and geochemical investigations

2006 ◽  
Vol 144 (3-4) ◽  
pp. 239-260 ◽  
Author(s):  
S MERTANEN ◽  
J VUOLLO ◽  
H HUHMA ◽  
N ARESTOVA ◽  
A KOVALENKO
Keyword(s):  
Fennoscandian Shield ◽  
Isotope Age ◽  
Russian Karelia

Paleomagnetism of 2.44 Ga mafic dykes in Russian Karelia, eastern Fennoscandian Shield — implications for continental reconstructions

1999 ◽  
Vol 98 (3-4) ◽  
pp. 197-221 ◽  
Author(s):  
S. Mertanen ◽  
H.C. Halls ◽  
J.I. Vuollo ◽  
L.J. Pesonen ◽  
V.S. Stepanov
Keyword(s):  
Fennoscandian Shield ◽  
Mafic Dykes ◽  
Russian Karelia

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.

Heat flux and seismicity in the Fennoscandian Shield

2001 ◽  
Vol 126 (3-4) ◽  
pp. 147-162 ◽  
Author(s):  
V. Pasquale ◽  
M. Verdoya ◽  
P. Chiozzi
Keyword(s):  
Heat Flux ◽  
Fennoscandian Shield

Mantle sources of rocks in the Vodlozero Domain of the Fennoscandian Shield

2009 ◽  
Vol 429 (1) ◽  
pp. 1284-1287 ◽  
Author(s):  
S. B. Lobach-Zhuchenko ◽  
V. A. Glebovitskii ◽  
N. A. Arestova
Keyword(s):  
Fennoscandian Shield ◽  
Mantle Sources

8-1: Fennoscandian shield–proterozoic VMS deposits

2005 ◽  
Vol 27 (1-4) ◽  
pp. 324-325 ◽  
Author(s):  
Pär Weihed ◽  
Pasi Eilu
Keyword(s):  
Fennoscandian Shield ◽  
Vms Deposits

U–Pb Isotope Age of Zircon (LA–ICP–MS Method) from Magmatic Rocks and Some Aspects of the Genesis of the Tyrnyauz Mo–W Deposit (North Caucasus)

2021 ◽  
Vol 63 (5) ◽  
pp. 409-430
Author(s):  
S. G. Soloviev ◽  
S. G. Kryazhev ◽  
D. V. Semenova ◽  
Yu. A. Kalinin ◽  
V. S. Kryazhev ◽  
...  
Keyword(s):  
North Caucasus ◽  
Pb Isotope ◽  
Isotope Age ◽  
Magmatic Rocks ◽  
Icp Ms
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