Geochemistry and genesis of the Nadun Nb-enriched arc basalt in the Duolong mineral district, western Tibet: Indication of ridge subduction
文献类型：CNKI期刊论文
| 作者 | Tian-Yu Zhang; Jianghong Deng; Ming Wang; Cai Li; Lipeng Zhang; Weidong Sun
|
| 发表日期 | 2022-01-12 |
| 出处 | Geoscience Frontiers
 |
| 关键词 | Tibet Duolong porphyry Cu–Au deposit Nb-enriched arc basalt Tethys ocean Ridge subduction |
| 英文摘要 | 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 Ti O2(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(87 Sr/86 Sr)iratios of 0.7052 to 0.7056, negative eNd(t)(à 0.7 to à 0.2) and eHf(t) values(+ 6.0 to + 6.5), and high(206 Pb/204 Pb)i,(207 Pb/204 Pb)i,(208 Pb/204 Pb)iand 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. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | supported by the National Natural Science Foundation of China (Grant Nos.42002235,41803002) ; the National Key R&D Program of China (2016YFC0600408) ; the China Postdoctoral Science Foundation (Grant Nos.2019M652495,2018M642708) ; the Taishan Scholar Program of Shandong(ts201712075) ; the Ao Shan Talents Cultivation Program Supported by Qingdao National Laboratory for Marine Science and Technology (2017ASTCP-OS07) ; the Pilot National Laboratory for Marine Science and Technology (Qingdao)(No.JCZX202026) |
| 卷 | v.13期:01页:236-249 |
| 语种 | 英文; |
| 分类号 | P618.2;P588.145 |
| ISSN号 | 1674-9871 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/187542]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.CenterofDeepSeaResearch,InstituteofOceanology,CenterforOceanMega-Science,ChineseAcademyofSciences 2.SchoolofMarineSciences,UniversityofChineseAcademyofSciences 3.CollegeofEarthSciences,JilinUniversity 4.LaboratoryforMarineMineralResources,QingdaoNationalLaboratoryforMarineScienceandTechnology |
| 推荐引用方式 GB/T 7714 | Tian-Yu Zhang,Jianghong Deng,Ming Wang,et al. Geochemistry and genesis of the Nadun Nb-enriched arc basalt in the Duolong mineral district, western Tibet: Indication of ridge subduction. 2022. |
入库方式： OAI收割
来源：海洋研究所
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