气候变化领域集成服务门户(CCPortal): Geochronology, Geochemistry, and Implications of Aplite Dyke in the Giant Jiama Porphyry Copper System, Tibet

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DOI	10.1111/1755-6724.15037
	Geochronology, Geochemistry, and Implications of Aplite Dyke in the Giant Jiama Porphyry Copper System, Tibet
	Qi, Jing; Tang, Juxing; Lin, Bin; Yang, Hairui; Tang, Xiaoqian; Tang, Pan; Fang, Xiang; Zhang, Tingting; Li, Faqiao; Sun, Miao; Wang, Mengdie; Cui, Hao; Xie, Jinling
发表日期	2023
ISSN	1000-9515
EISSN	1755-6724
起始页码	1406
结束页码	1421
卷号	97 期号:5
英文摘要	Jiama is a giant, high-grade porphyry copper system in the Gangdese metallogenic belt, Tibet. Multistage intermediate-felsic porphyries intruded in this deposit, some of which are strongly associated with copper-polymetallic mineralization. These ore-bearing porphyries include monzogranite, granodiorite, and quartz diorite porphyries. A new granite aplite dyke was found in the south of Jiama. Its age, genesis, and relationship with ore-related magmatism are obscure. Here, its emplacement age and petrogenesis were determined using mineralogy, zircon U-Pb dating, geochemistry, and Sr-Nd-Pb isotope studies. The zircon LA-ICP-MS U-Pb age of the aplite dyke is 16.66 +/- 0.21 Ma (n = 14, MSWD = 0.66), earlier than that of the ore-bearing porphyries (similar to 15 Ma) in Jiama. Furthermore, the aplite exhibits high amounts of silicon (SiO2 = 73.39%-74.74%), potassium (K2O = 5.12%-6.61%), aluminum (Al2O3 = 14.25%-14.69%), and light/heavy rare earth elements (LREE/HREE = 12.12-16.19) as well as negative europium (delta Eu = 0.47-0.72) and weak negative cerium anomalies (delta Ce = 0.84-0.93). The aplite dyke is characteristic of metaluminous-peraluminous I-type granite, which is rich in large-ion lithophile elements (Rb, Ba, Th and U) and depleted in high-field-strength elements (Nb, P and Ti). The aplite dyke and ore-bearing porphyries in the Jiama deposit are the results of a partial melting of the juvenile lower crust, according to whole-rock geochemistry and Sr-Nd-Pb isotope data, but the dyke and ore-bearing porphyries were emplaced from the same magma chamber at different times. Thus, the aplite dyke shows the composition of the early evolution stage of shallow magma in the Jiama deposit and is the product of rapid condensation and crystallization. image
关键词	U-Pb age Sr-Nd-Pb isotope geochemistry aplite dyke Jiama
英文关键词	I-TYPE GRANITES; S-TYPE GRANITES; U-PB AGE; TRACE-ELEMENTS; ARC MAGMAS; DEPOSIT; ZIRCON; CU; SUBDUCTION; GEOLOGY
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001093353000008
来源期刊	ACTA GEOLOGICA SINICA-ENGLISH EDITION
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283114
作者单位	China University of Geosciences - Beijing; China Geological Survey; Chinese Academy of Geological Sciences; Southwest University of Science & Technology - China; China Geological Survey; Chinese Academy of Geological Sciences; China Geological Survey; Chengdu University of Technology; Tibet University
推荐引用方式 GB/T 7714	Qi, Jing,Tang, Juxing,Lin, Bin,et al. Geochronology, Geochemistry, and Implications of Aplite Dyke in the Giant Jiama Porphyry Copper System, Tibet[J],2023,97(5).
APA	Qi, Jing.,Tang, Juxing.,Lin, Bin.,Yang, Hairui.,Tang, Xiaoqian.,...&Xie, Jinling.(2023).Geochronology, Geochemistry, and Implications of Aplite Dyke in the Giant Jiama Porphyry Copper System, Tibet.ACTA GEOLOGICA SINICA-ENGLISH EDITION,97(5).
MLA	Qi, Jing,et al."Geochronology, Geochemistry, and Implications of Aplite Dyke in the Giant Jiama Porphyry Copper System, Tibet".ACTA GEOLOGICA SINICA-ENGLISH EDITION 97.5(2023).