Results 121 to 130 of about 16,262 (232)

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

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 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

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

Primordial Eukaryotes in a Paleoproterozoic Sea [PDF]

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

Paleoproterozoic orogenic belts

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

U-Pb ID-TIMS age of the Tiksheozero carbonatite: expression of 2.0 Ga alkaline magmatism in Karelia, Russia

Open Geosciences, 2011
Corfu Fernando, Bayanova Tamara, Shchiptsov Vladimir, Frantz Natalia   +3 more
doaj   +1 more source

Revisiting the greatness of Earth's great oxidation. [PDF]

Commun Earth Environ
Crockford PW, Sugiyama I, Kipp MA, Hao J, Nelson LL, Hemingway JD, Wimmer S, Fakhraee M.   +7 more
europepmc   +1 more source