Results 81 to 90 of about 2,604 (197)

Paleomagnetic Constraints on the Separation of the Olongbuluke Block From the North China Block During the Late Cambrian–Middle Ordovician and Its Tectonic Significance

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, Yanan Zhou, Ruiyang Chai, Xin Cheng, Hanning Wu   +4 more
wiley   +1 more source

Dark Land Surfaces Allow for Refugia That Could Support Photosynthetic Life on the Surface of Snowball Earth

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, Marysa M. Laguë, Abigail L. S. Swann, Cecilia M. Bitz, Edwin D. Waddington, Stephen G. Warren   +5 more
wiley   +1 more source

Estonian georesources in the European context [PDF]

Estonian Journal of Earth Sciences, 2008
Estonia is situated on the southern buried slope of the Baltic Shield where the sedimentary bedrock overlies the Precambrian crystalline basement. The Cambrian section contains mainly sandstone and clay (e.g.
Raudsep, Rein
doaj  

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, Shihong Zhang, Jikai Ding, Qiang Ren, Haiyan Li, Weiwei Bian, Tianshui Yang, Huaichun Wu   +7 more
wiley   +1 more source

The Significance of Inherited Crustal Thickening in Surface Uplift of Hangai Dome in Central Mongolia

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract The Hangai Dome in central Mongolia represents one of the most prominent intracontinental uplifts, yet the relative contributions of crustal and mantle dynamics in sustaining its high topography remain unresolved. Here we jointly invert Rayleigh wave dispersion and receiver function data to constrain crustal and uppermost mantle structures ...
Yingkai Wu, Xuewei Bao, Mengfan Jiang, Bingfeng Zhang, Wenjia Song   +4 more
wiley   +1 more source

Reduced Injection Rates and Shallower Depths Mitigated Induced Seismicity in Oklahoma

The Seismic Record
The proximity of wastewater disposal to the Precambrian basement is a critical factor influencing induced earthquake rates in the Central United States, but the impact of reducing injection depths has not been widely demonstrated.
Robert J. Skoumal, Andrew J. Barbour, Justin L. Rubinstein, Margaret E. Glasgow   +3 more
doaj   +1 more source

Ostracods from the Nimar Sandstone Formation, Bagh Group (Upper Cretaceous) of Pipaldehla, Jhabua District, Madhya Pradesh, India: Paleobiogeography and age

Journal of the Palaeontological Society of India
The palaeobiogeography and age of the upper calcareous part of the Nimar Sandstone (NS), Bagh Group is determined based on ostracod fossils. The rocks of the NS directly rest over the Precambrian basement rocks outcropping near Pipaldehla, Gola Chhoti ...
Madan L. Nagori, Maya Chaudhary, Mahesh Kalal   +2 more
doaj   +1 more source

Assessment of the contribution of Precambrian deposits in forming the petroleum potential of the eastern part of the Volga-Urals basin using results of modeling

Записки Горного института
Consideration is given to results of geochemical analysis of organic matter and oils of the Proterozoic (the RF-V complex) and the Paleozoic (the pay intervals D2, D3, C1-2) of the eastern part of the Volga-Urals petroleum basin.
Dmitrii D. Kozhanov, Mariya Bolshakova
doaj  

Molybdenum isotope fractionations between ferromanganese oxides and seawater influenced ancient sedimentary isotopic signatures

Communications Earth & Environment
The use of molybdenum isotopes (δ98Mo) as a paleo-redox proxy requires quantifications of fluxes and isotopic fractionations in each molybdenum sink.
Mengchun Cao, Guang-Yi Wei, Feifei Zhang, Xiangwen Ren, Xuefa Shi, Yi-Bo Lin, Tao Li, Sihui Chen, Hong-Fei Ling, Jian Cao   +9 more
doaj   +1 more source

Geology of the Precambrian W (lower Precambrian) rocks in western Gogebic County, Michigan [PDF]

, 1976
openaire   +1 more source