Results 61 to 70 of about 12,911 (237)

Data from: The Proterozoic record of eukaryotes

, 2015
Proterozoic strata host evidence of global “Snowball Earth” glaciations, large perturbations to the carbon cycle, proposed changes in the redox state of oceans, the diversification of microscopic eukaryotes, and the rise of metazoans.
Macdonald, Francis A., Cohen, Phoebe A.
core   +1 more source

Mid-Proterozoic Evolution of the Grenville Belt: Evidence from Neodymium Isotopic Mapping, Bancroft, Ontario [PDF]

, 1992
Detailed Neodymium isotopic mapping was performed on grey gneisses from the Algonquin Park area of Ontario, in the Central Gneiss Belt of the southwestern Grenville Province.
Martin, Christopher
core  

Cambro-Proterozoic volcanism near Buckingham, Quebec

, 1981
Grenvillian gneiss and marble of the Buckingham area, Quebec were intruded by a syenite–monzonite–diorite suite, overlain by trachyandesite, and, finally, intruded by diabase.
Donald D. Hogarth, Jean Lafleur
core   +1 more source

Dating mylonitic overprinting of ancient rocks

Communications Earth & Environment, 2023
The timing of deformation in ancient shear zones of the Akia Terrane, Greenland, is recorded by the Proterozoic Rb-Sr age of mylonitic biotite which is determined through collision cell laser ablation and inverse thermal history modelling.
Christopher L. Kirkland, Hugo K. H. Olierook, Martin Danišík, Janne Liebmann, Julie Hollis, Bruno V. Ribeiro, Kai Rankenburg   +6 more
doaj   +1 more source

Lipid taphonomy in the Proterozoic and the effect of microbial mats on biomarker preservation

The pre-Ediacaran biomarker record has several characteristic features that distinguish it from its Phanerozoic counterpart, including high concentrations of unresolved complex mixture (UCM), low concentrations or absence of eukaryotic steranes, and a ...
Brocks, Jochen J., Butterfield, Nicholas J., Pawlowska, Maria M.   +2 more
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Proterozoic ocean redox and biogeochemical stasis [PDF]

, 2013
International audienceThe partial pressure of oxygen in Earth's atmosphere has increased dramatically through time, and this increase is thought to have occurred in two rapid steps at both ends of the Proterozoic Eon (~2.5-0.543 Ga).
Lalonde, Stefan, Partin, C.A., Konhauser, K.O, Bekker, A., Robbins, Leslie J., Konhauser, Kurt O., Gill, B.C., Reinhard, C., T., Lyons, Timothy W., Reinhard, Christopher T., Planavsky, Noah J., Gill, Benjamin C., Lalonde, Stefan V., Planavsky, N.J., Robbins, L. J., Partin, Camille A., Lyons, T. W., Bekker, Andrey   +17 more
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Uranium deposits of Canada: a review

FACETS
Over the past 15 years, there has been a resurgence of interest in nuclear power and advanced nuclear fuel cycles because nuclear energy can have a significant impact on the reduction of greenhouse gases.
S.R. Beyer, M. Fayek
doaj   +1 more source

Proterozoic Geology

Eos, Transactions American Geophysical Union, 1984
This book and its companion, Early Proterozoic Geology of the Great Lakes Region (Mem. 160 Geological Society of America, 1984), edited by L.G. Medaris, Jr., are the products of an International Proterozoic symposium held at the University of Wisconsin, Madison, May 18–21, 1981.
openaire   +1 more source

Late Proterozoic bedrock geology and its influence on neogene littoral marine diamondiferous trapsites, MA1-Sperrgebiet, Namibia

, 2001
Bibliography: leaves 117-128.Namibia's south western coast, the Sperrgebiet, hosts one of the world's largest diamond placer deposits. Diamond distribution in this placer deposit is directly related to the presence of a diamond-carrying gravel, the ...
Jacob, Jana
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Proterozoic Eastern Ghats Belt, India - a witness of multiple orogenies and its lineage with ancient supercontinents

, 2009
The Eastern Ghats Belt of India exposes a deep crustal section that witnessed multiple events of deformation, magmatism and metamorphism throughout the Proterozoic eon. Structural and petrological styles show variations in both, space and time. Available
Karmakar, Subrata, Das, Kaushik, Bose, Sankar, Sankar Bose, Kaushik Das, Somnath Dasgupta, Dasgupta , Somnath, Subrata Karmakar   +7 more
core   +1 more source