Results 101 to 110 of about 6,981 (220)

Pb Isotope Mapping of Paleoproterozoic Gneisses in the SW Grenville Province: Evidence for a Cryptic Continental Suture

Geosciences, 2018
New whole-rock lead (Pb) isotope analyses are presented in this study for granitoid orthogneisses from the Southwest Grenville Province in Ontario and Western Quebec.
Gabriel A. Arcuri, Alan P. Dickin
doaj   +1 more source

Paleoproterozoic crustal history of the southwestern Grenville Province: evidence from Nd isotopic mapping

, 1995
Nd isotopic mapping in the North Bay area of the Central Gneiss Belt, southwestern Grenville Province, has revealed the precise trend of a TDM model age line developed between the uplifted southern margin of the Archean Superior craton (TDM = 2.7 Ga ...
A. P. Dickin, C. Holmden
core   +1 more source

The nagssugtoqidian orogen in South-East Greenland: evidence for paleoproterozoic collision and plate assembly

, 2008
The 200 km wide, east-west trending Paleoproterozoic mobile belt of the Ammassalik region of South-East Greenland contains a diverse assemblage of Paleoproterozoic and Archean rocks, variably affected by Paleoproterozoic deformations and high-grade low ...
Clark R L Friend (20199522), Allen Nutman (19587061), Feiko Kalsbeek (8738454)   +2 more
core  

Late Paleoproterozoic ultrahigh-temperature metamorphism in the Korean Peninsula

, 2018
The Paleoproterozoic rock record from the Sino-Korean Peninsula was fundamental to the models on evolution of the Asian continental collage and its relationship with the amalgamation and disruption of Proterozoic supercontinents such as Columbia and ...
Weon-Seo Kee, Chao-Nan Hu, Sung Won Kim, Kee, W., Li Tang, Tang, L., M. Santosh, Kim, S., Santosh, M., Hu, C.   +9 more
core   +1 more source

Geochemistry of Precambrian carbonates: V. Late Paleoproterozoic seawater

, 1992
In an effort to obtain better constrained data for the first- and second-order variations in the isotopic composition of late Paleoproterozoic (1.8 ± 0.2 Ga) seawater, we report a study of mineralogy, chemistry, and isotopic composition of the Coronation
Plumb, K. A., Hinton, R. W., Clayton, R. N., Veizer, Ján, Grotzinger, J. P.   +4 more
core  

Paleoproterozoic Birimian Geology for sustainable development

, 2018
International audienceThe aim of this volume namely “Paleoproterozoic Birimian Geology of West African Craton for Sustainable Development” is the fruit of IGCP638 meetings in Senegal and Morocco.
Aifa, Tahar
core   +1 more source

Ocean chemistry in the Paleoproterozoic

, 2019
The present-day oxidizing conditions at Earth's surface are due to the high oxygen content of the atmosphere. However, oxygen was not always stable in the terrestrial atmosphere. Two distinct periods during which oxygen increased in a step-like manner were required to reach the current atmospheric oxygen level.
openaire   +1 more source

Development of thermal state and plate tectonics in the North China Craton during Neoarchean–Paleoproterozoic

Communications Earth & Environment
Although the early tectonic regime of the Earth remains debated, it is generally accepted that the geodynamic system underwent a notable transition during the Neoarchean–Paleoproterozoic.
Xiangqiao Han, Jiahui Qian, Changqing Yin, Jian Zhang, Peng Gao   +4 more
doaj   +1 more source

Detrital Zircon Evidence for Paleoproterozoic West African Crust Along the Eastern North American Continental Margin, Georges Bank, Offshore Massachusetts, USA

, 2017
Basement rocks from the Continental Offshore Stratigraphic Test (COST) No. G-1 petroleum exploration well, Georges Bank, offshore Massachusetts, USA, show the first direct evidence for a fragment of Paleoproterozoic West African crust preserved along the
Margaret D. Thompson, Sandra M. Barr, Thompson, Margaret D., J. Christopher Hepburn, White, Chris E., Kuiper, Yvette D., Barr, Sandra M., Hepburn, J. Christopher, Yvette D. Kuiper, James L. Crowley, Crowley, James L., Chris E. White   +11 more
core   +1 more source

Age of the granulitic metamorphism of the Nyong complex in the west border of Congo Craton, South Cameroon

Discover Geoscience
Pressure and temperature conditions and electron microprobe analysis dating on monazite were conducted to investigate the age of the tectono-metamorphic events of Nyong Complex.
Ndema Mbongué Jean-Lavenir, Nzenti Jean Paul, Cheo Emmanuel Suh, Sigue Cyrille   +3 more
doaj   +1 more source