Results 71 to 80 of about 17,986 (209)

The structure of the Western and Central parts of the Ukrainian schield. Controversial issues

Геофизический журнал, 2018
Some controversial issues of composing the Scheme of the fault megablock tectonics of the western half of the Ukrainian shield in connection with the decision of the Interdepartmental Tectonic Committee of Ukraine on drawing up the Tectonic map of the ...
О. B. Gintov, M. I. Orlyuk, V. A. Entin, I.K. Pashkevich, S. V. Mychak, M. I. Bakarzhieva, L. M. Shimkiv, A. V. Marchenko   +7 more
doaj   +1 more source

Old subcontinental mantle zircon below Oahu

Communications Earth & Environment, 2021
Oceanic mantle-derived zircon grains recovered from pyroxenite xenoliths in Hawaii have 14-million-year-old rims, Cretaceous cores and Proterozoic lutetium-hafnium model-ages, according to mass spectrometry and electron microprobe analyses.
John D. Greenough, Sandra L. Kamo, Donald W. Davis, Kyle Larson, Zhen Zhang, Daniel Layton-Matthews, Joan De Vera, Bridget A. Bergquist   +7 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
core   +1 more source

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

Trace element and Sr-Nd-Pb isotope geochemistry of Rungwe Volcanic Province, Tanzania: Implications for a superplume source for East Africa Rift magmatism

Frontiers in Earth Science, 2014
The recently discovered high, plume-like 3He/4He ratios at Rungwe Volcanic Province (RVP) in southern Tanzania, similar to those at the Main Ethiopian Rift in Ethiopia, strongly suggest that magmatism associated with continental rifting along the entire ...
Paterno R Castillo, David R Hilton, Sæmundur A Halldórsson, Sæmundur A Halldórsson   +3 more
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Proterozoic Sutures in Canada

, 1980
Geophysicists generally agree that one ormore supercontinents were in motion during the Proterozoic. A more controversial issue is whether these supercontinents were at times internally fragmented into smaller crustal units that subsequently collided and
Gibb, R. A., Thomas, M. D., Mukhopadhyay, M.   +2 more
core   +1 more source

Phosphorites [PDF]

, 2017
First International Field Workshop and Seminar on Proterozoic-Cambrian Phosphorites, held in Australia, August ...
International Field Workshop and Seminar on Proterozoic-Cambrian Phosphorites, International Geological Correlation Programme   +1 more
core  

AP, 2004. Petrogenesis of Proterozoic lamproites and kimberlites from Cuddapah Basin and Dharwar Craton, southern India

, 2004
Proterozoic mafic potassic and ultrapotassic igneous rocks emplaced in the Cuddapah Basin and Dharwar Craton of the southern Indian shield are among the earliest recorded on Earth.
Gibson, S. A., Chalapathi Rao, N. V., Pyle, D. M., Dickin, A. P.   +3 more
core   +1 more source

A Research into the Relationship between Vegetation Changes and Stratum of the Mt.Qomolangma National Nature Reserve

Shuitu baochi yanjiu, 2012
According to the MODIS NDVI data from 2000 to 2009,TM,ETM data from 2000 to 2007,SRTM DEM data and Geological map in this study area,the maps of stratum,vegetation cover,DEM,change of NDVI-Max and slope were generated by interpretation and processing.We ...
CHEN Ying-feng, PENG Pei-hao
doaj