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Pan-African and Early Paleozoic Orogenic Events in Southern Tibet: Evidence from Geochronology and Geochemistry of the Kangbuzhenri Gneissic Granite in the Zhegu Area

文献类型：期刊论文

作者Cheng, Ming3; Hu, Xuming3; Tang, Yao3; Deng, Zhao3; Min, Yingzi3; Chen, Shiyi1,2; Sun, Saijun1,2; Zhou, Huanzhan3
刊名MINERALS
出版日期2024-08-01
卷号14期号:8页码:15
关键词chronology geochemistry Southern Tibet the Zhegu area Kerguelen mantle plume
DOI10.3390/min14080845
通讯作者Sun, Saijun(sunsaijun@qdio.ac.cn)
英文摘要The Zhegu area in southern Tibet is situated in the central and eastern part of the Tethys Himalayan tectonic belt, with the Kangbuzhenri area being abundant in gneissic granites. This study examines the petrology, chronology, and geochemistry of the Kangbuzhenri gneissic granite, providing insights into its Pan-African and Early Paleozoic geological evolution. The zircon U-Pb chronology indicates an upper intercept age of similar to 539 Ma, reflecting Pan-African orogenic events in the eastern part of the Tethys Himalayan tectonic belt, and a lower intercept age of similar to 144 Ma, representing a late tectonic-thermal event. Geochemically, the gneissic granites are calc-alkaline peraluminous rocks with high SiO2 and Al2O3 contents and low TiO2, P2O5, MgO, and FeOT contents. The gneissic granites are enriched in LREE and LILEs (Rb, Pb, Th, U, etc.), but relatively depleted in HREE and HFSEs (Nb, Ti, P, etc.). Most of them show a weak negative delta Eu anomaly, except for two samples which show a significant negative delta Eu anomaly due to the crystallization of plagioclase. Based on the above study, most of the gneissic granites exhibited the characteristics of an I-type granite, while two of the samples were a highly differentiated I-type granite with S-type affinities. All the above characteristics indicate that the gneissic granite likely originated from the partial melting of crustal materials and sediments with a minor involvement of mantle-derived materials. Combined with the previous chronological studies, the Kangbuzhenri gneissic granites were formed in an extensional tectonic environment during post-collision orogeny and then they were influenced by the Kerguelen mantle plume tectonic-thermal event around similar to 144 Ma and the subsequent Southern Tibet Detachment System (STDS).
WOS关键词LARGE IGNEOUS PROVINCE ; S-TYPE GRANITES ; TETHYAN HIMALAYA ; VOLCANIC-ROCKS ; INDIAN MARGIN ; MAFIC ROCKS ; MAGMAS ; PETROGENESIS ; DOME ; DISCRIMINATION
资助项目National Natural Science Foundation of China ; Taishan Scholar Program of Shandong[tspd20230609] ; Taishan Scholar Program of Shandong[LSKJ202204100] ; China Geological Survey Project[1212011220659] ; China Geological Survey Project[DD20230527] ; China Geological Survey Project[ZD20220309] ; [42373049]
WOS研究方向Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
语种英语
WOS记录号WOS:001307222400001
出版者MDPI
源URL[http://ir.qdio.ac.cn/handle/337002/198268]  
专题海洋研究所_深海极端环境与生命过程研究中心
通讯作者Sun, Saijun
作者单位1.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Key Lab Ocean Observat & Forecasting, Qingdao 266071, Peoples R China
2.Qingdao Marine Sci & Technol Ctr, Lab Marine Geol, Qingdao 266237, Peoples R China
3.China Geol Survey, Changsha Gen Survey Nat Resources Ctr, Changsha 410600, Peoples R China
推荐引用方式
GB/T 7714		 Cheng, Ming,Hu, Xuming,Tang, Yao,et al. Pan-African and Early Paleozoic Orogenic Events in Southern Tibet: Evidence from Geochronology and Geochemistry of the Kangbuzhenri Gneissic Granite in the Zhegu Area[J]. MINERALS,2024,14(8):15.
APA Cheng, Ming.,Hu, Xuming.,Tang, Yao.,Deng, Zhao.,Min, Yingzi.,...&Zhou, Huanzhan.(2024).Pan-African and Early Paleozoic Orogenic Events in Southern Tibet: Evidence from Geochronology and Geochemistry of the Kangbuzhenri Gneissic Granite in the Zhegu Area.MINERALS,14(8),15.
MLA Cheng, Ming,et al."Pan-African and Early Paleozoic Orogenic Events in Southern Tibet: Evidence from Geochronology and Geochemistry of the Kangbuzhenri Gneissic Granite in the Zhegu Area".MINERALS 14.8(2024):15.

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来源：海洋研究所

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