Establishing an Indosinian geochronological framework for episodic granitic emplacement and W-Sn-Nb-Ta mineralization in Limu mining district, South China
Establishing an Indosinian geochronological framework for episodic granitic emplacement and W-Sn-Nb-Ta mineralization in Limu mining district, South China
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建立华南梨木矿区幕式花岗岩侵位和钨锡铌钽矿化印支年代学框架
DOI：
10.1016/j.oregeorev.2019.02.012
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发表时间：
2019-04
影响因子：
3.3
通讯作者：
Chunzeng Wang
中科院分区：
文献类型：
--
作者：
Meng Feng;Zuohai Feng;Zhiqiang Kang;Wei Fu;Ya Qing;Rongguo Hu;Yongfeng Cai;Yangyang Feng;Chunzeng Wang
栗木矿区位于中国南方南岭多金属带。该区有多个钨锡铌钽矿床和多个出露和未出露花岗岩体，这些岩体在深部连接成一个单一的岩体，称为栗木复合岩体。矿床产于岩体岩株之内或之上，具有密切的相互空间关系。该地区存在两种类型的W-Sn-Nb-Ta矿化或矿石：主要的石英脉型和次要的钠长岩花岗岩型。近年来，除了石英脉型矿石外，对花岗岩和矿石进行了广泛的高精度U-Pb锆石（SHRIMP和LA-ICP-MS）和Ar-Ar白云母年代学分析。本文应用Ar-Ar白云母定年方法对5个石英脉型矿床的石英脉型矿石进行了定年，获得了5个新的40 Ar/39 Ar坪年龄，范围为210 ± 1.5 ~ 205.5 ± 1.6Ma。用LA-ICP-MS法对未矿化的泡水岭和矿化的育才岩块进行了新的锆石U-Pb定年，得到加权平均年龄分别为230.8 ± 0.63Ma和222.7 ± 1.2Ma。本研究以栗木地区所有花岗岩和矿化类型的可靠年代学资料为基础，结合野外和岩相学观察，试图建立栗木地区三个幕式花岗岩类和两种矿化类型的高分辨率年代学格架。第一幕为跑水岭钠长-锂云母花岗岩，年龄为230.8 ± 0.63Ma，第二幕为224.8 ± 1.6-222.7 ± 1.2Ma，第三幕为218.3 ± 2.4-212.3 ± 1.8Ma。高温钠长花岗岩型成矿作用始于第二幕花岗岩侵位，并持续到第三幕。白云母Ar-Ar年龄表明，石英脉型成矿作用发生在钠长花岗岩型成矿作用之后，在第三幕后热液成矿作用中起主导作用，成矿时间为210 ± 1.5-205.5 ± 1.6Ma。
The Limu mining district is located in the Nanling Polymetallic Belt in South China. The district contains a number of W-Sn-Nb-Ta deposits and a number of exposed and unexposed granitic stocks that are connected as a single pluton at depth, referred to as Limu composite pluton. The deposits occur either within or above the stocks of the pluton, bearing a close mutual spatial relationship. Two types of W-Sn-Nb-Ta mineralization or ores exist in the district: the predominant quartz-vein type and the lesser albite-granite type. Extensive high-precision U-Pb zircon (SHRIMP and LA-ICP-MS) and Ar-Ar muscovite geochronological analyses on the granite stocks and the ores were performed in recent years, with exception only for the quartz-vein-type ores. This study applied Ar-Ar muscovite dating method for the quartz-vein-type ores at five quartz-vein-type deposits and obtained five new40Ar/39Ar plateau ages ranging from 210 ± 1.5 Ma to 205.5 ± 1.6 Ma. New U-Pb zircon dating with LA-ICP-MS method was also performed for the non-mineralized Paoshuiling and mineralized Yucai stocks, which yielded weighted mean ages of 230.8 ± 0.63 Ma and 222.7 ± 1.2 Ma, respectively. With reliable geochronological data available for all the granites and mineralization types, combining field and petrographic observations, this study attempts to establish a high-resolution geochronological framework for three episodic granitic stocks and two mineralization types of the Limu district. The first episode is represented by Paoshuiling annite-lepidolite granite aged at 230.8 ± 0.63 Ma; the second-episode granite was emplaced at 224.8 ± 1.6–222.7 ± 1.2 Ma; and the third at 218.3 ± 2.4–212.3 ± 1.8 Ma. The high-temperature albite-granite-type mineralization began in the second episode of granitic emplacement and lasted into the third episode. The quartz-vein-type mineralization was subsequent to the albite-granite-type mineralization and immediately dominated the post-third-episode hydrothermal ore-forming process at 210 ± 1.5–205.5 ± 1.6 Ma as revealed by new muscovite Ar-Ar ages obtained in this study.
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DOI：
10.1144/gsl.mem.1985.010.01.26
发表时间：
1985
期刊：
Geological Society, London, Memoirs
影响因子：
--
作者：
M. H. Dodson;E. McClelland-Brown
通讯作者：
M. H. Dodson;E. McClelland-Brown
华南珊瑚矿田晚白垩世钨锡矿化锆石U-Pb和白云母40Ar-39Ar精密年代学新成果
影响因子：
3.3
作者：
Yongfeng Cai;Zuohai Feng;Tongbin Shao;Rongguo Hu;Yun Zhou;Jifeng Xu
通讯作者：
Jifeng Xu
DOI：
--
发表时间：
1996
期刊：
--
影响因子：
--
作者：
O. Earth
通讯作者：
O. Earth
影响因子：
3.5
作者：
Belousova, EA;Griffin, WL;Fisher, NI
通讯作者：
Fisher, NI
DOI：
--
发表时间：
2014
期刊：
--
影响因子：
--
作者：
Chen Yu-chua
通讯作者：
Chen Yu-chua