Geological characteristics and metallogenic age of Tengshan'ao Sn deposit in Dayishan of South Hunan and its prospecting significance

IF 2 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Solid Earth Sciences Pub Date : 2021-03-15 DOI:10.1016/j.sesci.2021.01.002

Zunzun Zhang , Yongyun Ning , Youyue Lu , Jingya Cao , Jianming Fu , Zhuang Zhao , Jian Guo , Liyan Ma , Zhengwei Qin , Jianfeng Li

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引用次数: 8

Abstract

The Tengshan'ao Sn deposit, located at the Dayishan ore field, Nanling Range, is one of the recently explored deposits in this region. In this study, LA-MC-ICP-MS cassiterite U–Pb and muscovite ⁴⁰Ar-³⁹Ar isotopic dating analyses for altered granite-type Sn ores yielded ages of 156.7 ± 4.3 Ma and 151.1 ± 1.5 Ma, respectively. These ages are consistent to the LA-MC-ICP-MS zircon U–Pb age of the fine-grained two-mica monzogranite (158.2 ± 1.6 Ma), indicating a coeval magmatism and mineralization for the Late Jurassic Tengshan'ao Sn deposit. It is further demonstrated that the formation of this deposit is related to the Early Yanshanian (160-150 Ma) large-scale diagenesis and mineralization in Nanling Range. It is suggested that the late-stage fine-grained two-mica (muscovite) granite has an indicative significance for searching the altered granite type Sn polymetallic mineralization.

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湘南大山腾山岙矿床地质特征、成矿时代及找矿意义

腾山坳锡矿床位于南岭大山矿田，是该地区近年来发现的矿床之一。通过LA-MC-ICP-MS锡石U-Pb和白云母40Ar-39Ar同位素定年分析，蚀变花岗岩型锡矿石的年龄分别为156.7±4.3 Ma和151.1±1.5 Ma。这些年龄与细粒二云母二长花岗岩的LA-MC-ICP-MS锆石U-Pb年龄(158.2±1.6 Ma)一致，表明晚侏罗世腾山坳锡矿床存在岩浆作用和成矿作用。进一步论证了该矿床的形成与南岭早燕山期(160 ~ 150 Ma)大规模成岩成矿作用有关。认为晚期细粒二云母(白云母)花岗岩对寻找蚀变花岗岩型锡多金属成矿具有指示意义。

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