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

doi:10.3390/min14080845

	Pan-African and Early Paleozoic Orogenic Events in Southern Tibet: Evidence from Geochronology and Geochemistry of the Kangbuzhenri Gneissic Granite in the Zhegu Area
	Cheng, Ming 1; Hu, Xuming 1; Tang, Yao 1; Deng, Zhao 1; Min, Yingzi 1; Chen, Shiyi 2,3; Sun, Saijun 2,3; Zhou, Huanzhan 1
	2024-08-01
发表期刊	MINERALS
卷号	14 期号:8 页码:15
通讯作者	Sun, Saijun([email protected])
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).
关键词	chronology geochemistry Southern Tibet the Zhegu area Kerguelen mantle plume
DOI	10.3390/min14080845
收录类别	SCI
语种	英语
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
WOS类目	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS记录号	WOS:001307222400001
出版者	MDPI
WOS关键词	LARGE IGNEOUS PROVINCE ; S-TYPE GRANITES ; TETHYAN HIMALAYA ; VOLCANIC-ROCKS ; INDIAN MARGIN ; MAFIC ROCKS ; MAGMAS ; PETROGENESIS ; DOME ; DISCRIMINATION
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/198269
专题	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.China Geol Survey, Changsha Gen Survey Nat Resources Ctr, Changsha 410600, Peoples R China 2.Qingdao Marine Sci & Technol Ctr, Lab Marine Geol, Qingdao 266237, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Key Lab Ocean Observat & Forecasting, Qingdao 266071, 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.