Results 101 to 110 of about 8,820 (215)

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

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

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  

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

Primordial Eukaryotes in a Paleoproterozoic Sea [PDF]

Goldschmidt Abstracts, 2020
Benjamin Nettersheim, Jochen Brocks
openaire   +1 more source

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

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

Geological records of the Great Oxidation Event (GOE) in China: Progress, challenge, and opportunity

Dizhi lixue xuebao
Objective  The Great Oxidation Event (GOE) during the early Paleoproterozoic represents one of the most significant geological events in Earth’s history and has profound impacts on Earth’s surface environment, biological evolution, and the formation of ...
ZHANG Shuanhong
doaj   +1 more source

Revisiting the origin and significance of the Paleoproterozoic complex in the Himalaya: new insights from apatite geochemistry

All Earth
This study examines the tectono-thermal evolution of the Paleoproterozoic complex in the Arun area, eastern Nepal, highlighting the role of apatite geochemistry, along with zircon U–Pb dating and whole-rock analyses.
Takeshi Imayama, Keewook Yi, Kazumasa Aoki   +2 more
doaj   +1 more source

Microbialite Niches Across the Archean and Paleoproterozoic

Geophysical Research Letters
Abstract Changes in microbialite abundance during the Archean and Paleoproterozoic have been attributed to a variety of environmental and biological factors, yet past work looking at large‐scale patterns of microbialite abundance generally assumes shallow marine deposition rather than incorporating specific settings.
C. M. Howard, N. D. Sheldon
openaire   +1 more source