桂东北苗儿山-越城岭东北部界牌钨-铜矿区成矿岩体锆石U-Pb年龄及华南加里东期成矿分析

发布时间：2018-05-22 13:16

本文选题：华南 + 苗儿山-越城岭　；参考：《大地构造与成矿学》2017年06期

【摘要】：界牌W-Cu矿床产于苗儿山-越城岭复式岩体东北部斑状黑云母花岗岩与灰岩接触带的矽卡岩中,是苗儿山-越城岭复式岩体矿集区最大的矽卡岩型W-Cu矿床。矿区出露的主要岩体为斑状黑云母花岗岩及后期浅色花岗岩体,矿区外围则大面积出露斑状黑云母二长花岗岩。矿化产于斑状黑云母花岗岩与灰岩接触带矽卡岩,及斑状黑云母花岗岩中灰岩捕虏体矽卡岩化带中。黑云母花岗岩发育花岗岩型钨矿床成矿早期常见的钠长石化、云英岩化及从岩体至外接触带蚀变矿物组合显示形成温度逐渐降低。这些现象表明斑状黑云母花岗岩与矿床具有紧密成因联系。本文获得矿区斑状黑云母花岗岩、斑状黑云母二长花岗岩和浅色花岗岩体锆石LA-ICP-MS U-Pb年龄分别为:422±11 Ma,428±7 Ma,410±7 Ma,表明界牌W-矿床及区内主要岩体均形成于加里东期。本文的同位素年龄及前人报道的苗儿山-越城岭矿集区和华南加里东期与花岗岩有关矿床同位素年龄表明苗儿山-越城岭矿集区W-Mo-Cu矿床成矿主要发生在加里东期和印支期,U矿成矿主要发生在燕山期,华南在加里东期发生了分布广泛、成矿元素组合多样的与花岗岩有关的成矿事件,有很好的找矿前景,今后应加强华南加里东期矿床的找矿工作。
[Abstract]:The Jiepai W-Cu deposit occurs in skarn in the contact zone between porphyry biotite granite and limestone in the northeastern Miaoershan-Yuechengling complex, and is the largest skarn type W-Cu deposit in the Miaoershan-Yuchengling complex. The main intrusions are porphyry biotite granite and late light-colored granite, while the porphyry biotite monzogranite is exposed in large area around the mine area. Mineralization occurs in skarn in the contact zone between porphyry biotite granite and limestone and in skarn belt of limestone xenoliths in porphyry biotite granite. The formation temperature of the biotite granitic tungsten deposit in the early stage of mineralization, such as albite, quartz and altered mineral assemblage from the rock mass to the external contact zone, gradually decreased. These phenomena indicate that the porphyry biotite granite is closely related to the deposit. The zircon LA-ICP-MS U-Pb ages of porphyry biotite granites, porphyry biotite monoliths and light colored granites are obtained in this paper. The zircon LA-ICP-MS U-Pb ages of the porphyry biotite granites, porphyry biotite monoliths and light colored granites are respectively: 1. 422 卤11 Ma428 卤7 Ma-410 卤7 Ma. indicating that the Jiepai W- deposit and the main rock bodies in the area were formed in Caled@@ The isotopic ages of the Miaoershan-Yuechengling ore concentration area and the Caledonian granite-related deposits in South China indicate that the W-Mo-Cu deposits in the Miao 'ershan-Yuechengling ore concentration area mainly occurred in the Caledonian period. In the Indosinian period, the ore-forming occurred mainly in the Yanshanian period. The metallogenic events related to granites occurred in the Caledonian period in South China with a wide distribution of metallogenic elements and various assemblages. The prospecting work of Caledonian deposits in South China should be strengthened in the future.
【作者单位】：中国科学院广州地球化学研究所矿物学与成矿学重点实验室;中国科学院大学;广西大学资源与冶金学院;
【基金】：国家自然科学基金项目(41372084、41272099) 科技部国家重点研究计划(2016YFC0600407)联合资助
【分类号】：P597;P618.2

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