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- W1246704992 abstract "Neoproterozoic granitoids occur widely in the central uplift zone of the Tianshan Orogen. Two SHRIMP zircon U-Pb ages of (942±7) and (919±6) Ma (2σ) have been obtained for granitic gneisses of the Xingxingxia area in East Tianshan and the Wenquan area in West Tianshan, respectively. These granitoids are characterized by a very coarse-grained and huge augen gneiss texture. Major element data indicate that they belong to peraluminous monzogranite, with SiO2 (≥70%), K2O+Na2O (7% to≥8%), and K2O＞Na2O. These rocks show nearly parallel REE patterns with different abundances and distinct negative Eu anomalies. Contemporaneous migmatites from Xingxingxia have high REE abundances and show more pronounced LREE enrichment. All the granitoids from West Tianshan and East Tianshan display similar spidergrams with obvious negative anomalies in Ba, Nb, Sr, P, and Ti. In terms of Nd isotopic compositions, these rocks have e(subscript Nd) (t) from -4 to near zero, and t(subscript DM) ages from 2.0 to 1.6Ga. Due to the highly radiogenic nature of the Sr isotopic compositions, precise or meaningful initial ratios cannot be obtained. Based on the chemical characteristics and Nd isotopic compositions, the Neoproterozoic granitoids were likely generated in a continental margin tectonic setting and by remelting of Paleoproterozoic rocks, followed by advanced fractional crystallization. With consideration of the available zircon U-Pb ages from several areas (Wenquan, eastern Sayram Lake, Laerdundaban, Balguntay and Xingxingxia) in the Tianshan, we conclude that the formation of the Neoproterozoic granitoids in the Tianshan Orogen took place mainly in the period of 960 to 910 Ma. Furthermore, with the age information on the ancient terranes of Tarim basin, we suppose that the Tarim-Tianshan ancient blocks probably formed a part of Rodina during early Neoproterozoic period." @default.
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- W1246704992 date "2010-05-26" @default.
- W1246704992 modified "2023-09-23" @default.
- W1246704992 title "天山0.9Ga新元古代花岗岩SHRIMP锆石U-Pb年龄及其构造意义" @default.
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