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Article by Gao G
Article by Li B
Article by Yang B
Article by Liao Y
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Zircon U-Pb geochronology, geochemistry and Hf isotopic of granite porphyry in Xitieshan area of north margin of Qaidam Basin
GAO Ge-yue, LI Bi-le, YANG Bai-hui, LIAO Yu-bin
College of Earth Sciences, Jilin University, Changchun 130061, China
Abstract: The U-Pb chronology, geochemistry and Hf isotopic data of granite porphyry in the northeast Xitieshan area were studied. The results of zircon U-Pb geochronology and geochemical data for the granite porphyry show that the weighted mean age of the rock is 373.9±2.2 Ma (MSWD=0.069), suggesting that the intrusion was emplaced in Late Devonian. Petrogeochemically, the granites are characterized by high content of SiO2 (76.33%~76.99%) and (K2O+Na2O) (7.28%~8.19%), low content of CaO (0.58%~0.75%), MgO (0.20%~0.31%) and Mg# (23.29~30.17). The aluminum saturation index (A/CNK) is 0.97~0.98, belonging to metaluminous calc-alkaline rock series. The samples are enriched in large ion elements (Rb, Th, U), depleted in high field strength elements (Nb, Ta, Ti, P) and partial large ion elements (Ba, Sr). In the REE distribution patterns, the samples show a right inclined LREE/HREE pattern. The fractionation of LREE is obvious, while the fractionation of HREE is weak. And the granite porphyry is rich in LREE and poor in HREE, with obviously negative Eu anomalies (��Eu=0.36~0.43). The ��Hf(t) values of the granite porphyry range from +6.6 to +9.6, and two-stage Hf model ages (TDM2) range from 760 to 950 Ma. Integrating the study of geochemistry and isotopes, the granitic rocks belong to highly fractionated I-type granites, and the magma was originated from the partial melting of Neoproterozoic juvenile accreted lower crust that was derived from the depleted mantle. Combining with the regional tectonic background and previous research, it is concluded that the granite porphyry from Xitieshan were formed in extensional tectonic setting after the collision between Qaidam block and Qilian block.
Keywords: Xitieshan area   granite porphyry   geochemistry   zircon U-Pb age   zircon Hf isotopes  
�ո����� 2018-01-15 �޻����� 2018-04-19 ����淢������  
DOI: 10.3969/j.issn.1004-5589.2018.03.008
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