Geochemistry and genesis of the Nadun Nb-enriched arc basalt in the Duolong mineral district, western Tibet: Indication of ridge subduction

doi:10.1016/j.gsf.2021.101283

	Geochemistry and genesis of the Nadun Nb-enriched arc basalt in the Duolong mineral district, western Tibet: Indication of ridge subduction
	Zhang, Tian-Yu 1,2; Deng, Jianghong 1,2; Wang, Ming 3; Li, Cai 3; Zhang, Lipeng 1,2; Sun, Weidong1,2,4
	2022
发表期刊	GEOSCIENCE FRONTIERS
ISSN	1674-9871
卷号	13 期号:1 页码:14
通讯作者	Deng, Jianghong(jhdeng0507@163.com)
摘要	The Duolong mineral district in western Tibet is one of the largest porphyry Cu-Au deposit fields with significant metallogenic potential in China. Its tectonic environment relevant to Early Cretaceous Cu- Au mineralization remains controversial. Here we report new whole-rock major and trace element, and Sr-Nd-Hf-Pb isotopic data for the newly discovered basalt in the Nadun area, Duolong mineral district, to decipher their genesis and further constrain the tectonic environment. A contemporaneous rhyolite sample interbedded with the basalt in the lower part of the volcanic section in the Nadun area yields an LA-ICP-MS zircon U-Pb age of 122.5 +/- 1.2 Ma. The basalt samples exhibit high-K calc-alkaline/ shoshonite properties and are enriched in high field strength elements, e.g., high TiO2 (1.43-1.79 wt.%) and Nb (14.6-19.5 ppm) contents, with high Nb/La ratios (0.4-0.6), which are compositionally comparable to those of Nb-enriched arc basalts (NEABs). The (87Sr/86Sr)i ratios of 0.7052 to 0.7056, negative eNd(t) (- 0.7 to - 0.2) and eHf(t) values (+ 6.0 to + 6.5), and high (206Pb/204Pb)i, (207Pb/204Pb)i, (208Pb/204Pb)i and ratios (18.522 to 18.561, 15.641 to 15.645 and 38.679 to 38.730, respectively) suggest that the Nadun NEABs are more enriched than those of the island arc basalts (IABs) in the area. The slightly enriched radiogenic isotopes for the Nadun NEABs indicate that the subducting sediments play an important role in the source. Furthermore, their high Nb, Ti, and Cu contents indicate that the source mantle wedge was metasomatized by slab melts. The Nadun NEAB and other coeval magmatic rocks in the Duolong mineral district, including adakite, OIB-like basalt, MORB-type basalt, A-type rhyolite, and common IAB, are typical rock assemblages of ridge subduction. We infer that the Duolong mineral district were formed by ridge subduction in the Early Cretaceous. (c) 2021 China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).
关键词	Tibet Duolong porphyry Cu-Au deposit Nb-enriched arc basalt Tethys ocean Ridge subduction
DOI	10.1016/j.gsf.2021.101283
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[42002235] ; National Natural Science Foundation of China[41803002] ; National Key R&D Program of China[2016YFC0600408] ; China Postdoctoral Science Foundation[2019M652495] ; China Postdoctoral Science Foundation[2018M642708] ; Taishan Scholar Program of Shandong[ts201712075] ; AoShan Talents Cultivation Program - Qingdao National Laboratory for Marine Science and Technology[2017ASTCP-OS07] ; Pilot National Laboratory for Marine Science and Technology (Qingdao)[JCZX202026]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000731456400004
出版者	CHINA UNIV GEOSCIENCES, BEIJING
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/177558
专题	深海极端环境与生命过程研究中心
通讯作者	Deng, Jianghong
作者单位	1.Chinese Acad Sci, Ctr Deep Sea Res, Ctr Ocean Megasci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China 3.Jilin Univ, Coll Earth Sci, Changchun 130061, Peoples R China 4.Univ Chinese Acad Sci, Sch Marine Sci, Beijing 100049, Peoples R China
第一作者单位	中国科学院海洋大科学研究中心
通讯作者单位	中国科学院海洋大科学研究中心
推荐引用方式 GB/T 7714	Zhang, Tian-Yu,Deng, Jianghong,Wang, Ming,et al. Geochemistry and genesis of the Nadun Nb-enriched arc basalt in the Duolong mineral district, western Tibet: Indication of ridge subduction[J]. GEOSCIENCE FRONTIERS,2022,13(1):14.
APA	Zhang, Tian-Yu,Deng, Jianghong,Wang, Ming,Li, Cai,Zhang, Lipeng,&Sun, Weidong.(2022).Geochemistry and genesis of the Nadun Nb-enriched arc basalt in the Duolong mineral district, western Tibet: Indication of ridge subduction.GEOSCIENCE FRONTIERS,13(1),14.
MLA	Zhang, Tian-Yu,et al."Geochemistry and genesis of the Nadun Nb-enriched arc basalt in the Duolong mineral district, western Tibet: Indication of ridge subduction".GEOSCIENCE FRONTIERS 13.1(2022):14.

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