Results 71 to 80 of about 2,704 (186)
Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.Abstract The collisional evolution of the micro‐blocks in the northeastern Tibetan Plateau is relatively well constrained. However, the reason why a fragment of the North China Block, the Olongbuluke Block, became separated from North China by the Central Qilian Block (a fragment of the South China Block) remains unclear.
Teng Wang +4 more
wiley +1 more source
Journal of Geophysical Research: Atmospheres, Volume 131, Issue 13, 16 July 2026.Abstract Photosynthetic eukaryotic algae survived the Neoproterozoic Snowball Earth events, indicating that liquid‐water refugia existed somewhere on the surface. We examine the potential for refugia at the coldest time of a snowball event, before CO2 had risen and with high‐albedo ice on the frozen ocean, before it became darkened by dust deposition ...
Greta E. M. Shum +5 more
wiley +1 more source
Molar tooth carbonates and benthic methane fluxes in Proterozoic oceans
Nature Communications, 2016 Molar tooth structures are common in early- to mid-Proterozoic carbonates but extremely rare in rocks younger than 750 Ma. Here, the authors show molar tooth carbonate formation is related to benthic methane fluxes.
Bing Shen +8 more
doaj +1 more source
Paleosecular Variation Constraints on Geomagnetic Field Morphology at ca. 1100 Ma
Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.Abstract Paleosecular variation provides a statistical test of long‐term geomagnetic field morphology, but its behavior across Precambrian polarity regimes remains poorly constrained. We compile a virtual geomagnetic pole dispersion data set spanning 1130–1070 Ma and apply nonlinear Model G fitting to evaluate field structure across the interval ...
Hanqing Zhao +7 more
wiley +1 more source
Geochemical environments of the Archean-Proterozoic
Доклады Академии наук, 2019 In the Precambrian section, there is a change of Archean calcite carbonate rocks to magnesia and ferrous in the Proterozoic. This is correlated with the massive development of cyanobacteria, the absorption of which carbon dioxide and the generation of oxygen, led to a change in the acidic reduction conditions of Archaean alkaline oxidizing in the ...
openaire +2 more sources
Precambrian glaciations and the evolution of the atmosphere
Annales GeophysicaePrecambrian glaciations appear to be confined to two periods, one in the early Proterozoic between 2.5 and 2 Gyears BP (Before Present) and the other in the late Proterozoic between 1 and 0.57 Gyear BP.
J. H. Carver, I. M. Vardavas
doaj
Proterozoic Basins of Peninsular India: Status within the Global Proterozoic Systems
Proceedings of the Indian National Science Academy, 2016 This compilation is intended to present a snap-shot of the current status of the knowledge on the Proterozoic sediments and tectonic events that are preserved in Peninsular India; on the backdrop of the growing understanding of global events and environmental evolution during that period.
openaire +1 more source
An early diverging SQR enzyme in Antarctic <i>Gloeobacterales</i> indicates sulfide tolerance in thylakoid-lacking cyanobacteria. [PDF]
Microbiol SpectrHambücken L +5 more
europepmc +1 more source
The Origin and Early Evolution of Fungi: Challenges, Inferences, and Principles. [PDF]
Annu Rev Cell Dev BiolRokas A.
europepmc +1 more source