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- W4328114458 endingPage "2153" @default.
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- W4328114458 abstract "The temporal and spatial extents of the Palaeo – Pacific and Mongol – Okhotsk tectonic systems, which together dominated the Mesozoic tectonics of NE China, still remain unclear. Here, we present new zircon U–Pb ages, isotopic analyses and whole‐rock major‐ and trace‐element data for felsic rocks from west and east Songliao Basin to explore the above question. The granites in Shancheng area formed between 176 and 164 Ma and have ε Hf (t) values of −22.09 to −7.59 with a T DM2 age range of 3622–2336 Ma. The granites are dominated by adakites and I‐type granite whose primary magma is derived from a thickened ancient crust. The rhyolites in Wushijiazi area formed between 151 and 141 Ma and have ε Hf (t) values of 3.34–12.38 with a T DM2 age range of 517–1328 Ma. They are A‐type granite and have a flat rare‐earth‐element (REE) pattern with obvious negative Eu anomalies, suggesting they were derived from partial melting of lower crustal rocks. The above findings indicate that the middle – late Jurassic granite in the Shancheng area formed in a compression setting related to the subduction of the Palaeo – Pacific Plate beneath the Eurasian continent and the Late Jurassic to early Cretaceous rhyolites in Wushijiazi area formed in an extensional setting related to the collapse of the Mongol – Okhotsk belt. In combination with regional geologic data, we conclude that the Palaeo – Pacific tectonic system mainly affected the east side of Songliao Basin, while the Mongol Okhotsk tectonic system mainly affected the Erguna Block, through the GXAR to the northern margin of the North China Craton (NCC)." @default.
- W4328114458 created "2023-03-22" @default.
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- W4328114458 date "2023-03-20" @default.
- W4328114458 modified "2023-10-15" @default.
- W4328114458 title "Spatial–temporal influence of the <scp>Mongol–Okhotsk</scp> and <scp>Palaeo–Pacific</scp> tectonic systems in <scp>NE</scp> China: Evidence from geochronological and geochemical data of felsic rocks in the east‐Central Jilin Province and southern Great Xing'an Range" @default.
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