Results 111 to 120 of about 16,157 (210)

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

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

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

The Magondi Belt in southern Africa: Implication for Paleoproterozoic crustal evolution in the northwestern Zimbabwe Craton [PDF]

, 2019
The Tenth Symposium on Polar Science/Ordinary sessions: [OG] Polar Geosciences, Wed. 4 Dec.
Kazuki Takahashi, Maideyi Lydia Meck, Md. Sazzadur Rahman, Prince Mandingaisa, Sam Uthup, Toshiaki Tsunogae   +5 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

Neoarchean sanukitoid series in the Karelian Province, Finland [PDF]

, 2011
Sanukitoid series intrusions can be found throughout the Archean Karelian Province of the Fennoscandian shield. All sanukitoids share the same controversial elemental characteristics: they have high content of incompatible elements such as K, Ba, and Sr ...
Heilimo, Esa
core  

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

Paleoproterozoic volcanic arc magmatism in the Lützow-Holm Complex, East Antarctica [PDF]

, 2016
第7回極域科学シンポジウム:[OG] 地圏11月29日（火）国立極地研究所 1階 ...
堤 之恭, 角替 敏昭, 高村 悠介, 高橋 一輝   +3 more
core   +1 more source