Results 111 to 120 of about 6,981 (220)

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

Geochronology and geochemistry of the late Paleoproterozoic aluminous A-type granite in the Xiaoqinling area along the southern margin of the North China Craton: Petrogenesis and tectonic implications

, 2016
The occurrence of extensional-related A-type granites with a high-K nature in some early Precambrian blocks hints a possible link with the orogeny, and may imply the ending of the orogenic processes and the beginning of craton stabilization.
Deng, Xiaoqin, Peng, Touping, Zhao, Taiping   +2 more
core   +1 more source

Primordial Eukaryotes in a Paleoproterozoic Sea [PDF]

Goldschmidt Abstracts, 2020
Benjamin Nettersheim, Jochen Brocks
openaire   +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

PALEOPROTEROZOIC MINISTROMATOLITES OF KARELIA: STRUCTURE AND COMPOSITION

Proceedings of the Karelian Research Centre of the Russian Academy of Sciences, 2019
The main subdivisions among the most widespread column types in the Paleoproterozoic complex of Karelian ministromatolites were identified based on their characteristic morphological features. That helps to refine the classification of the class Ministromatophyceae (ministromatolites) and systematize the available material. Individual petrographic thin
openaire   +3 more sources

Zircon provenances of the late Paleoproterozoic metasedimentary rock in the South Yangtze Block: Implications for paleogeographic reconstruction

The zircon provenances of the late Paleoproterozoic metasedimentary rocks are important for assembling Proto-Yangtze and its reconstruction in the Nuna supercontinent.
Guangming Ren (5787479), Fenglin Chen (4448632), Weihua Pang (6824606), Jie Peng (188267), Zhiming Sun (8524680), Shilei Liu (7498997)   +5 more
core   +1 more source

Paleoproterozoic Reworking of Archean Crust and Extreme Back‐Arc Metamorphism in the Enigmatic Southern Trans‐Hudson Orogen

Geophysical Research Letters
The crustal evolution of the southernmost ∼2000–1800 Ma Trans‐Hudson orogen (THO) is enigmatic due to burial by Phanerozoic sediments. We provide new insights through petrochronologic analysis of a paragneiss drill core sample.
Ian W. Hillenbrand, Amy K. Gilmer, Michael L. Williams, A. Kate Souders, Michael J. Jercinovic, Heather A. Lowers, Jorge A. Vazquez   +6 more
doaj   +1 more source

Paleoproterozoic evolution of Senegal in the Birimian Framework

, 2012
The whole of East-Senegal Birimian terrains have been investigated with a pluri-thematic approach combining airborne geophysics, field mapping, geochemical and isotopic data. Birimian Easternmost Paleoproterozoic terrains begins with the Mako Group of volcanics and metavolcanics, all assumed to have been emplaced at 2.20-2.18 Ga as a juvenile crust ...
Théveniaut, Hervé, Delor, Claude
openaire   +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

Paleoproterozoic orogenic belts

, 1996
M R St-Onge, S B Lucas
openaire   +1 more source