The Pirrit Hills are located in the Ellsworth–Whitmore Mountains of West Antarctica. granite exhibits significant negative Eu anomalies (Eu/Eu* = 0.01~0.25) and a REE tetrad effect indicating intensive magmatic differentiation. Whole-rock Rb-Sr Sm-Nd geochronologic analysis gave respective ages 172.8 ± 2.4 Ma with initial 87Sr/86Sr 0.7065 0.0087 169 12 144Nd/143Nd 0.512207 0.000017. isotopic ra...

The availability of oxygen and nutrients during the Mesoproterozoic (1.6–1.0 Ga) is thought to influence rate eukaryote evolution. cause transition from low productivity in upper Wumishan Formation organic-rich sediments Hongshuizhuang remains unknown. We report FeHR/FeT, Fepy/FeHR, MoEF, UEF, VEF, [Ce/Ce*]SN one core Yanliao Basin study redox evolution compare it with other sections different ...

Sedimentologic, paleogeographic, stratigraphic, structural and tectonic studies in a paleo/mesoproterozoic metasedimentary succession (Espinhaço Megasequence, southeastern Brazil) indicates deposition in a rift-sag basin. Four basin evolution stages are recognized (prerift, rift, transitional and flexural). The four stages can be represented by six unconformity-bounded tectonosequences. The unc...

This trip examines exposures in the Adirondack Lowlands that contain Paleozoic hydrothermal and faultrelated features hosted by Mesoproterozoic ‘Grenville’ marbles and Cambrian Potsdam Sandstone. These features have been the source of some debate historically and are now explicable as resulting from hydrothermal activity within an ancient wrench fault system. This system is similar to the deep ...

Deformation-resistant cratons comprise >60% of the continental landmass on Earth. Because they were formed mostly in Archean to Mesoproterozoic, it remains unclear if cratonization was a process unique early We address this question by presenting an integrated geological-geophysical data set from Tarim region central Asia. This shows that deformable domain Proterozoic Paleozoic, but defo...