气候变化领域集成服务门户(CCPortal): Petrogenesis and tectonic dynamics of Early Jurassic magmatic rock in the Taizhao area, southern Tibet

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DOI	10.18654/1000.0569/2023.12.05
	Petrogenesis and tectonic dynamics of Early Jurassic magmatic rock in the Taizhao area, southern Tibet
	Wang HaiTao; Zeng LingSen; Gao LiE; Zhao LingHao; Gao JiaHao
发表日期	2023
ISSN	1000-0569
EISSN	2095-8927
起始页码	3585
结束页码	3604
卷号	39 期号:12
英文摘要	The Gangdese batholith in southern Tibet preserves various magmatic rocks that can be used to infer tectono-magmatic processes associated with the northward subduction of the Neo-Tethyan oceanic lithosphere and with the Indian -Eurasian continental collision. The granitic pluton in Taizhao area in this batholith consists of two groups of granites, i. e., Group I with high Na/K ratios and Group II with low Na/K ratios, respectively. Furthermore, a set of gabbro and diorite developed in Basum Co area, several kilometers to the east of Taizhao area. The Group II granites are treated as the main object in this paper to the studies for comparing with the other two ones. Zircon U-Pb dating results indicate that Group II granites formed at 190 similar to 194Ma, which is coeval with Group I granites. The Group II granites are characterized by slightly more enriched Hf (epsilon(Hf)( t) = 7. 2 similar to -2. 5) and Nd(epsilon(Nd)(t) = 4. 1 3. 7) and lower Sr (Sr-87/Sr-86( t) = 0. 7061 - 0. 7070) isotope compositions than those in Group I granites, which is similar to the isotope compositions of intermediate-mafic rocks. Such features indicate that Group II granites represent the product derived from fractional crystallization of intermediate-mafic magmas. The intermediate-mafic magmas originated from melting of melt -modified sub -arc mantle. The contents of SiO2 of Group II granites display negative correlations with Al2O3 CaO, TiO2, FeOT, MgO, Sr and Sc, but positive correlations with Na2O, Rb, Nb and Ta. These geochemical features suggest the important role of hornblende and plagioclase and potassium feldspar as fractional crystallization phases during the differentiation of more -primitive mafic magma and the formation of high -Si granites, respectively. Both of them possibly represent the contemporaneous magmatism during the northward subduction of the Neo-Tethyan Oceanic lithosphere.
关键词	Lhasa terrane Early Jurassic Granite Neo-Tethys Ocean Tibet
英文关键词	U-PB; HF ISOTOPES; ARC MAGMAS; ZIRCONS; EVOLUTION; COLLISION; GANGDESE; BELT
WOS研究方向	Geology
WOS记录号	WOS:001152994000005
来源期刊	ACTA PETROLOGICA SINICA
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282755
作者单位	Tianjin Normal University; China Geological Survey; Institute of Geology, Chinese Academy of Geological Sciences; Ministry of Natural Resources of the People's Republic of China; Chinese Academy of Geological Sciences; China Geological Survey; Chinese Academy of Geological Sciences; Institute of Geology, Chinese Academy of Geological Sciences; China Geological Survey; National Research Center for Geoanalysis, Chinese Academy of Geological Sciences; Chinese Academy of Geological Sciences
推荐引用方式 GB/T 7714	Wang HaiTao,Zeng LingSen,Gao LiE,et al. Petrogenesis and tectonic dynamics of Early Jurassic magmatic rock in the Taizhao area, southern Tibet[J],2023,39(12).
APA	Wang HaiTao,Zeng LingSen,Gao LiE,Zhao LingHao,&Gao JiaHao.(2023).Petrogenesis and tectonic dynamics of Early Jurassic magmatic rock in the Taizhao area, southern Tibet.ACTA PETROLOGICA SINICA,39(12).
MLA	Wang HaiTao,et al."Petrogenesis and tectonic dynamics of Early Jurassic magmatic rock in the Taizhao area, southern Tibet".ACTA PETROLOGICA SINICA 39.12(2023).