Pb–Sr–Nd isotope constraints on the fluid source of the Dahu Au–Mo deposit in Qinling Orogen, central China, and implication for Triassic tectonic setting | |
Zhi-Yong Ni; Yan-Jing Chen; Nuo Li; Hui Zhang | |
刊名 | Ore Geology Reviews
![]() |
2012 | |
卷号 | 46页码:60-67 |
关键词 | Sr–nd–pb Isotope Systematics ore-forming Fluid the Dahu Au–mo Deposit qinling Orogen oceanic Plate Subduction |
英文摘要 | The Dahu Au–Mo deposit is a structure-controlled lode system occurring in the northern Xiaoqinling terrane, Huaxiong Block, Qinling Orogen. This paper reports a new Sr–Nd–Pb isotope dataset obtained for ore sulfides and the hostrocks within the Taihua Supergroup, in an attempt to constrain the source of the ore-forming fluids from a new dimension. 16 sulfide samples yield ISr ratios of 0.70470–0.71312, with an average of 0.70854; εNd(t) values between − 13.5 and − 18.1, with average of − 15.1; and (206Pb/204Pb)i, (207Pb/204Pb)i and (208Pb/204Pb)i ratios of 17.033–17.285, 15.358–15.438, and 37.307–37.582, with averages of 17.162, 15.405, and 37.440, respectively. 5 gneiss samples from the Taihua Supergroup yield ISr ratios of 0.70947–0.73201, averaging 0.72294; εNd(t) values of − 20.0 to − 31.1, averaging − 25.1; and (206Pb/204Pb)i, (207Pb/204Pb)i, (208Pb/204Pb)i ratios of 17.127–18.392, 15.416–15.604 and 37.498–37.814, with averages of 17.547, 15.470 and 37.616, respectively. These data show that the ore sulfides have less radiogenic Sr–Nd–Pb isotope systematics than the hostrocks, and suggest that the ore-forming fluids, which interacted with the wallrocks to form ores, must be sourced from a depleted mantle or a depleted, subducted oceanic slab. In combination with the spatial scenario and geochemical signatures of the Triassic magmatites and mineral systems, we argue that in the Triassic the Mianlue Ocean was not completely closed, and that the northward oceanic plate subduction still survived along the Mian-Lue suture, which caused the Late Triassic magmatism and associated mineralization in Qinling Orogen, including the Au–Mo Dahu deposit. |
语种 | 英语 |
内容类型 | 期刊论文 |
源URL | [http://ir.gyig.ac.cn/handle/42920512-1/9458] ![]() |
专题 | 地球化学研究所_矿床地球化学国家重点实验室 |
作者单位 | 1.Key Laboratory of Orogen and Crustal Evolution, Peking University, Beijing, 100871, China 2.Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China 3.Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China |
推荐引用方式 GB/T 7714 | Zhi-Yong Ni;Yan-Jing Chen;Nuo Li; Hui Zhang. Pb–Sr–Nd isotope constraints on the fluid source of the Dahu Au–Mo deposit in Qinling Orogen, central China, and implication for Triassic tectonic setting[J]. Ore Geology Reviews,2012,46:60-67. |
APA | Zhi-Yong Ni;Yan-Jing Chen;Nuo Li; Hui Zhang.(2012).Pb–Sr–Nd isotope constraints on the fluid source of the Dahu Au–Mo deposit in Qinling Orogen, central China, and implication for Triassic tectonic setting.Ore Geology Reviews,46,60-67. |
MLA | Zhi-Yong Ni;Yan-Jing Chen;Nuo Li; Hui Zhang."Pb–Sr–Nd isotope constraints on the fluid source of the Dahu Au–Mo deposit in Qinling Orogen, central China, and implication for Triassic tectonic setting".Ore Geology Reviews 46(2012):60-67. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论