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桂东北苗儿山-越城岭岩体是南岭成矿带西段出露面积最大的复式岩体,出露面积超过3000km2,由早期岩基及晚期小岩体组成.早期岩基主要为中粒斑状黑云母花岗岩,晚期岩体主要为白云母花岗斑岩及白云母二长花岗岩.岩基内外接触带发育一系列W-Sn-Mo-Pb-Zn-Cu矿床,形成矿集区.本文分析了苗儿山-越城岭南西部早期岩基、产于岩基中云头界晚期赋矿岩体及云头界W-Mo矿床同位素年龄.苗儿山-越城岭岩基锆石LA-ICP-MSU-Pb年龄:228.7±4.1Ma,MSWD=2.49,可能发育一期锆石LA-ICP-MSU-Pb年龄为243.0±5.8Ma,MSWD=2.62的岩浆活动.云头界晚期赋矿岩体锆石LA-ICP-MSU-Pb年龄216.8±4.9Ma,MSWD=1.44;云头界W-Mo矿床辉钼矿Re-Os等时线年龄216.8±7.5Ma,MSWD=11.3.苗儿山-越城岭南西部岩基、晚期赋矿岩体及矿床同位素年龄表明南西部岩基、晚期岩体及相关矿床都是印支期形成的,苗儿山-越城岭岩基内外接触带矿床主要和晚期岩浆活动有关;实验获得的同位素年龄及前人华南印支期花岗岩及矿床同位素年龄表明,华南不但经历了燕山期大规模岩浆成矿事件,也经历了印支期成岩成矿事件,有很好的找矿前景,今后应注意华南印支期矿床的找矿工作.
The northeastern Guangxi Miaoshan - Yuechengling pluton is the largest exposed complex rock mass in the western part of Nanling metallogenic belt, with an area of more than 3000 km 2, consisting of early and late small rock mass.The early subgrade is mainly Mesolithic biotitic granodiorite, the late rock mass is mainly muscovite granite porphyrite and muscovite monzogranite.With a series of W-Sn-Mo-Pb-Zn-Cu deposits in the inner and outer contact zone of the rock foundation, forming ore district This paper analyzes the early basement of the Miao’ershan-Yuechengling southwestern part, the late-stage ore-bearing intrusions in the Yuntoujie of the rock foundation and the W-Mo deposit ages of the Yuntoujie Formation. The age of the ICP-MSU-Pb is 228.7 ± 4.1Ma and the MSWD is 2.49. The magmatic activity of the LA-ICP-MSU-Pb zircon of stage I is 243.0 ± 5.8Ma and the MSWD is 2.62. The zircon LA-ICP-MSU-Pb age is 216.8 ± 4.9Ma and the MSWD is 1.44. The Re-Os isochron age of W-Mo deposit in Yuntoujie is 216.8 ± 7.5Ma and MSWD is 11.3. The rock foundation in the south western part of Chengling Ridge and the age of the late ore body and the isotopic ages of the ore deposits show that the rock foundation in the southwestern part, the late rock mass and the related ore deposits are formed during the Indosinian. The deposits of the Mianershan- It is related to the late magmatic activity. The isotopic ages obtained from the experiment and the predecessors, the South China Indosinian granites and the isotopic age of the ore deposits indicate that the South China experienced not only the large-scale magmatic mineralization event of Yanshanian period but also the Indosinian diagenetic mineralization event, Have a good prospects for prospecting, the future should pay attention to Indochina prospecting work in South China.