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Whole-rock geochemistry and zircon trace element, UPb and Hf isotopic data for Upper Permian volcanic ash at Shangsi show a significant change in source from the Emeishan Large Igneous Province (LIP) to a convergent plate margin magmatic arc. The lower stratigraphic samples display high Al2O3/TiO2 ratios, strong negative Eu anomalies, and no depletion in high field strength elements. Zircons with...
In this paper, we report new whole-rock geochemical and zircon U–Pb data for monzogranites in the NE Xing’an block. These data constrained the petrogenesis of C type (high Sr/Y) adakitic rocks and showed the spatial extent of the influence of the Mongol-Okhostsk ocean tectonic regime and the collision between the Jiamusi Massif and Songliao Terrane. New zircon laser-ablation inductivity coupled plasma...
Claystone beds directly below and above the Emeishan basalts in SW China formed around the Guadalupian-Lopingian (G−L) boundary. Zircons from both levels give U–Pb ages of ~260Ma, and are identical within-error to ages reported for the Emeishan Large Igneous Province (LIP). The claystones lack Nb−Ta anomalies on primitive mantle normalized elemental diagrams; zircons from these claystones have a geochemical...
The Linghao Formation is composed of interbedded clastic and basaltic rocks in the Napo region of Youjiang Basin, Southwest China. The basalts are geochemically divided into low-Ti and high-Ti groups. Relative to the high-Ti group, the low-Ti group exhibits lower Ti/Y ratios, higher ratios of Th/Nb and Th/La, more significant negative Nb–Ta anomalies and lower ε Nd (t) values (−7.26 to +0...
Continual deep-water sediments from the late Early Devonian to the Late Permian extended in wide areas of western Guangxi. We analyzed the major, trace, and rare earth elements of the Upper Paleozoic cherts in Badu, western Guangxi. High non-terrigenous SiO2 contents (Sinon-ter/Sibulk(%)> 80%) and pure chert components (> 70%) indicate a large extent of silicification in the Upper Paleozoic...
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