Results 71 to 80 of about 6,981 (220)

Paleoproterozoic molassoid complexes of SW Chana

Moscow University Bulletin. Series 4. Geology, 2016
Based on a study of modern-day published evidences and own data the lithology, conditions of sedimentations, tectonic evolution and mineralization of molassoid complexes of SW Ghana which filled Tarkwa and Bui basins within the Birrimian paleoproterozoic orogenic belt are considered.
N. A. Bozhko, T. K. Adu, M. Yu. Kravtsova   +2 more
openaire   +2 more sources

Geochemical and Isotopic Constraints on Long‐Lived Source Enrichment and Mantle Evolution in Paleoproterozoic Cratonic Lamprophyres

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.
Abstract The cratonic lithospheric mantle records complex metasomatic processes and is frequently tapped by alkaline magmatism, offering a unique opportunity to trace the progressive evolution of the mantle. In the present contribution, we investigate a newly identified calc‐alkaline lamprophyre field from the Neoarchean Jonnagiri Schist Belt, Eastern ...
Sourav Naskar, Rohit Pandey, Nils Björn Baumann, N. V. Chalapathi Rao, George Mathew, J. Amal Dev, J. K. Tomson   +6 more
wiley   +1 more source

Quantifying Water Diffusivity and Metamorphic Reaction Rates Within Mountain Belts, and Their Implications for the Rheology of Cratons

Geochemistry, Geophysics, Geosystems, 2021
The distribution of rheologically strong cratons, and their weakening by metamorphic hydration reactions, is of fundamental importance for understanding first‐order strength contrasts within the crust and the resulting controls on the tectonic evolution ...
A. J. Whyte, O. M. Weller, A. C. Copley, M. R. St‐Onge   +3 more
doaj   +1 more source

Microbial Ecology of the Heterogeneous Terrestrial Deep Biosphere Over 4 years in the Deep Mine Microbial Observatory (DeMMO)

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 6, June 2026.
Abstract The deep continental subsurface hosts a large, diverse, and poorly characterized microbiome. The geochemistry and microbiology of deep subsurface sites are closely linked and influenced by geological, hydrological, and anthropogenic factors. The Deep Mine Microbial Observatory (DeMMO; Lead, SD) was established in 2015 to provide stable portals
Magdalena R. Osburn, Caitlin P. Casar, Bradley S. Stevenson, Matthew Selensky, Brittany Kruger, Lily M. Momper, Theodore M. Flynn, Jan P. Amend   +7 more
wiley   +1 more source

AGE AND PETROGENESIS OF DOLERITES ON THE MARA RIVER (SAYAN MARGINAL UPLIFT OF THE BASEMENT, SOUTHERN PART OF THE SIBERIAN CRATON)

Геодинамика и тектонофизика
This work focuses on petrological-and-geochemical features, as well as age of dolerites widespread within the basins of the Mara, Kamenka and Uvat rivers.
I. А. Izbrodin, А. G. Doroshkevich, А. B. Kotov, Е. B. Salnikova, А. E. Izokh, Е. F. Letnikova, А. V. Ivanov   +6 more
doaj   +1 more source

Dating the Sedimentary Protolith of the Daldyn Group Quartzite, Anabar Shield, Russia: New Detrital Zircon Constraints

Geosciences, 2020
Quartzites and paragneisses of the Archean granulite series of the Anabar Shield (Siberian Craton, Russia) are described geochemically. The Sm-Nd isotope systematics of the rocks and the U-Pb age (SHRIMP II) and geochemistry of zircons from quartzites ...
Nikolay I. Gusev, Lyudmila Yu. Sergeeva, Sergey G. Skublov   +2 more
doaj   +1 more source

Gold mobilization during metamorphic devolatilization of Archean and Paleoproterozoic metavolcanic rocks

, 2020
Volcanic rocks in Archean and Paleoproterozoic greenstone belts are abundant and have been suggested as potential Au source for orogenic Au deposits. The behavior of Au during metamorphism of these rocks is however, poorly known.
Pitcairn, Iain K.,, Kolb, J., Molnár, Ferenc, Patten, Clifford, Guilmette, C., Peillod, Alexandre,, Peillod, A., Peillod, Alexandre, Pitcairn, Iain, Molnár, F., Beaudoin, Georges, Kolb, Jochen, Guilmette, Carl, Patten, C. G. C., Beaudoin, G., Pitcairn, I. K.   +15 more
core   +1 more source

Table3_Tectonic Juxtaposition of Two Independent Paleoproterozoic Arcs by Cenozoic Duplexing in the Arun Tectonic Window of the Eastern Nepalese Himalaya.XLSX

, 2022
The tectonic evolution of the Himalayan orogenic belt before Cenozoic convergence is important to understand its modern structural framework. There is still controversy regarding the tectonic history of the lower Lesser Himalaya Sequence (LHS) in the ...
Songjian Ao (7335755), Saunak Bhandari (11138066), Rui Li (4631), Karel Schulmann (2842937), Wenjiao Xiao (2816182), Qigui Mao (11640707), Dongfang Song (7335758), Zhou Tan (223704), Hao Wang (39217)   +8 more
core   +1 more source

Laurasian Seaway History During the Early Jurassic From Quantitative Mineralogy and Detrital Zircon Dating

Paleoceanography and Paleoclimatology, Volume 41, Issue 6, June 2026.
Abstract The Laurasian Seaway comprises a N‐S oriented trans‐Pangaean corridor linking Tethys to the Boreal Sea during the Jurassic, and direction of water flow has been the subject of considerable debate. The Llanbedr (Mochras Farm) borehole, Cardigan Bay Basin, Wales, is a uniquely informative record that comprises an expanded deep‐marine silty ...
M. Jiang, S. P. Hesselbo, G. Pieńkowski, E. Krzemińska, J. B. Riding, A. Uchman, D. Salata, C. V. Ullmann   +7 more
wiley   +1 more source

The Paleoproterozoic-Mesoproterozoic boundary of the North China Craton and the related geological issues: A review

, 2015
1.8 similar to 1.6Ga is a period when the planet Earth witnessed a critical revolution in global tectonic configuration, paleogeographic environment and biological evolution.
Zhai MingGuo, Deng XiaoQin, Hu GuoHui, Peng Peng, Zhao TaiPing, Zhou YanYan   +5 more
core