U-Pb, Re-Os and Ar-Ar dating of the Linghou polymetallic deposit, Southeastern China: Implications for metallogenesis of the Qingzhou-Hangzhou metallogenic belt
U-Pb, Re-Os and Ar-Ar dating of the Linghou polymetallic deposit, Southeastern China: Implications for metallogenesis of the Qingzhou-Hangzhou metallogenic belt
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东南岭后多金属矿床U-Pb、Re-Os和Ar-Ar定年：对青杭成矿带成矿的启示
DOI：
10.1016/j.jseaes.2017.02.016
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发表时间：
2017
影响因子：
3
通讯作者：
Zhou Limin
中科院分区：
文献类型：
--
作者：
Tang Yanwen;Xie Yuling;Liu Liang;Lan Tingguan;Yang Jianling;Sebastien Meffre;Yin Rongchao;Liang Songsong;Zhou Limin
中国东南部的青杭成矿带近年来日益受到人们的关注。attention.in然而，由于该带中的侵入体和相关矿床缺乏可靠的年龄，QHMB的构造背景和成矿作用尚未得到很好的了解。浙西北岭后多金属存款矿床是典型的QHMB矿床之一。根据野外关系，该存款可分为早期Cu-Au-Ag成矿阶段和晚期Pb-Zn-Cu成矿阶段。从铜、金、银矿体附近的铜矿巷道中采集了辉钼矿样品，矿物组合为辉钼矿-黄铜矿-黄铁矿±石英。6个辉长岩样品的Re-Os模式年龄为160.3 ~ 164.1Ma，Cu-Au-Ag矿化的平均年龄为162.2 ± 1.4Ma。热液白云母对铅锌铜矿化的Ar-Ar等时线年龄为160.2 ± 1.1Ma。该存款中分三期花岗闪长斑岩，LA-ICP-MS锆石U-Pb年龄分别为158.8 ± 2.4Ma、158.3 ± 1.9Ma和160.6 ± 2.1Ma，与Cu-Au-Ag和Pb-Zn-Cu成矿年龄相当。formed.at因此，这些侵入岩与铜金银、铅锌铜矿体有着密切的时空关系。矽卡岩矿物的存在（例如，石榴子石型和脉型矿石，结合前人的流体包裹体和H-O-C-S-Pb同位素资料，清楚地表明Cu-Au-Ag和Pb-Zn-Cu矿化与这些花岗闪长斑岩有成因联系。这一结论排除了该存款是“SEDEX”型矿床的可能性，也排除了以前提出的形成于大陆裂谷环境的坳陷盆地的可能性。相反，岭后多金属矿床和类似的矿床，如150-160 Ma永平斑岩-矽卡岩型铜钼矿床、东乡斑岩？水口山/康家旺矽卡岩铅锌矿床、佛子冲矽卡岩铅锌矿床和大宝山斑岩矽卡岩铅锌矿床均为岩浆-热液成因，可能形成于与俯冲有关的环境。这项工作提供了新的见解，这些侵入相关的存款（例如，。斑岩和矽卡岩类型）的中晚侏罗世年龄可以是最重要的目标QHMB。exploration.in
The Qingzhou–Hangzhou metallogenic belt (QHMB) in Southeastern China has gained increasingly attention.in recent years. However, due to the lack of reliable ages on intrusions and associated deposits in this.belt, the tectonic setting and metallogenesis of the QHMB have not been well understood. The Linghou.polymetallic deposit in northwestern Zhejiang Province is one of the typical deposits of the QHMB..According to the field relationships, this deposit consists of the early Cu–Au–Ag and the late Pb–Zn–Cu.mineralization stages. Molybdenite samples with a mineral assemblage of molybdenite–chalcopyrite–pyr.ite ± quartz are collected from the copper mining tunnel near the Cu–Au–Ag ore bodies. Six molybdenite.samples give the Re–Os model ages varying from 160.3 to 164.1 Ma and yield a mean age of.162.2 ± 1.4 Ma for the Cu–Au–Ag mineralization. Hydrothermal muscovite gives a well-defined Ar–Ar.isochron age of 160.2 ± 1.1 Ma for the Pb–Zn–Cu mineralization. Three phases of granodioritic porphyry.have been distinguished in this deposit, and LA–ICP–MS zircon U–Pb dating shows that they have formed.at 158.8 ± 2.4 Ma, 158.3 ± 1.9 Ma and 160.6 ± 2.1 Ma, comparable to the obtained ages of the Cu–Au–Ag.and Pb–Zn–Cu mineralization. Therefore, these intrusive rocks have a close temporal and spatial relationship.with the Cu–Au–Ag and Pb–Zn–Cu ore bodies. The presences of skarn minerals (e.g., garnet) and.vein-type ores, together with the previous fluid inclusion and H–O–C–S–Pb isotopic data, clearly indicate.that the Cu–Au–Ag and Pb–Zn–Cu mineralization are genetically related to these granodiorite porphyries..This conclusion excludes the possibility that this deposit is of ‘‘SEDEX” type and formed in a sag basin of.continental rifts setting as previously proposed. Instead, it is proposed that the Linghou polymetallic and.other similar deposits in the QHMB, such as the 150–160 Ma Yongping porphyry-skarn Cu–Mo,.Dongxiang porphyry? Cu, Shuikoushan/Kangjiawang skarn Pb–Zn, Fozichong skarn Pb–Zn and.Dabaoshan porphyry-skarn deposits are of magmatic-hydrothermal origin and likely formed in a.subduction-related setting. This work provides new insight that these intrusion-related deposits (e.g.,.porphyry and skarn types) of middle to late Jurassic age can be the most important targets for exploration.in the QHMB.