| 广西佛子冲矿区花岗闪长岩成岩时代讨论 |
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| 引用本文： | 蔡锦辉,刘炜,韦昌山,江河,张燕挥.广西佛子冲矿区花岗闪长岩成岩时代讨论[J].华南地质与矿产,2013(4):271-281. |
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| 作者姓名： | 蔡锦辉 刘炜 韦昌山 江河 张燕挥 |
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| 作者单位： | [1]中国地质调查局武汉地质调查中心,武汉430205 [2]广西佛子冲铅锌矿,广西梧州543003 [3]中国地质科学院地质力学所,北京100081 [4]山东省物化探勘查院,济南250013 |
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| 基金项目： | 广西国土资源厅“钦杭成矿带广西段整装勘查部署选区及成矿规律综合研究”和华锡集团广西佛子矿业有限公司“广西佛子冲矿田岩浆岩岩石地球化学特征及成岩成矿时代研究”项目资助. |
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| 摘 要： | 广西佛子冲铅锌矿区岩浆岩发育，其中花岗闪长岩与矿化存在密切的空间分布关系，在花岗闪长岩与围岩接触带形成矽卡岩化，主要铅锌矿体分布于矽卡岩蚀变带中。本文通过对花岗闪长岩和伟晶岩中锆石的研究，并采用LA—ICP-MS对单颗锆石进行了年龄测定，分别获得～228Ma和～248Ma两组和谐年龄，以及一批锆石稀土元素数据。在空间上，伟晶岩脉仅仅分布于花岗闪长岩附近，在伟晶岩中有花岗闪长岩残留。两组锆石样品中的稀土配分特征十分相似，两者的单颗粒锆石同位素年龄值也基本一致，这一时间与广西钦防海槽开始闭合，华夏板块与扬子板块发生碰撞的时间一致；反映出在海西．印支早期沿岑溪．博白深大断裂有一次岩浆上侵于老地层中，形成侵入岩和铅锌矿床。
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| 关 键 词： | 花岗闪长岩 LA-ICP—MS锆石年代学 海西一印支早期 佛子冲铅锌矿 |
Zircon U-Pb geochronology and mineralization significance of granodiorites from Fuzichong Pb-Zn deposit,Guangxi, South China. |
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| CAI Jin-Hui,LIU Wei,WEI Chang-Shan,JIANG He,ZHANG Yan-Hui.Zircon U-Pb geochronology and mineralization significance of granodiorites from Fuzichong Pb-Zn deposit,Guangxi, South China.[J].Geology and Mineral Resources of South China,2013(4):271-281. |
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| Authors: | CAI Jin-Hui LIU Wei WEI Chang-Shan JIANG He ZHANG Yan-Hui |
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| Institution: | Wtthan Centre of China Geological Survey, Wuhan 430205, China; 2. Fuzichong Pb-Zn Ore, Wuzhou 543100, Guangxi, China; 3. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China; 4. Shandong provincial Institute of geophysical and geochemical exploration, Ji ＇nan 250013, China) |
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| Abstract: | Granodiorite in Guangxi Fuzichong lead-zinc deposit are closely related to mineralization in spatial distribution, while the ore-bodies are mainly occurred in skarn zone between sedimentary rocks and granodior- ite. LA-ICP-MS zircons U-Pb dating of granodiorite and pegmatite in Fuzichong deposit are yielded average ages of- 228 Ma and - 248 Ma respectively, ha space, only the distribution ofpegmatite veins near the gran- odiorite, granodiorite have left in the pegmatite. Two samples of zircon REE characteristics are very similar, single zircon isotopic ages of both are basically the same, and concordance with the time of Qingzhou- Fang cheng trough starting close and beginning collision of Yangtze and Cathysia plate, which indicated that Fuzi- chong deposit was formed by magma intrusion in old stratum along Cenxi - Bobai deep fault in Hercynian - earlier Indosinian. |
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| Keywords: | Granodiorite LA-ICP-MS zircon geochronology Hercynian - earlier Indosinian Fuzichong Pb-Zndeposit Guangxi |
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