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| 华南燕山晚期构造-岩浆事件与成矿作用——来自广西大瑶山龙头山金矿床的地球化学约束 | |
| 引用本文： | 段瑞春,凌文黎,李青,陈子万,刘立芬,杨红梅.华南燕山晚期构造-岩浆事件与成矿作用——来自广西大瑶山龙头山金矿床的地球化学约束[J].地质学报,2011,85(10):1644-1658. |
| 作者姓名： | 段瑞春 凌文黎 李青 陈子万 刘立芬 杨红梅 |
| 作者单位： | 1. 中国地质大学(武汉)地球科学学院,武汉,430074;武汉地质矿产研究所,武汉,430205 2. 中国地质大学(武汉)地球科学学院,武汉,430074 3. 广西地质矿产勘查开发局,南宁,530023 4. 武汉地质矿产研究所,武汉,430205 5. 黑龙江省地质调查研究总院,哈尔滨,150036 |
| 基金项目： | 自然科学基金面上项目“扬子克拉通西北缘-南秦岭西段前寒武纪早期基底岩系的同位素年代学和地球化学研究”（编号：40873017）和“扬子克拉通神农架-黄陵地区古元古代晚期岩浆事件与地壳增生的地球化学研究”（编号：40673025） |
| 摘 要： | 广西贵港大瑶山成矿带位于华南东南沿海成矿带西南端,对矿带内龙头山金矿黄铁矿化斑岩进行定年的结果为96.1±3.0 Ma,与区域内邻近的平天山侵入岩体(96.2±0.4 Ma)相同.龙头山矿床的Sr同位素组成与其锆石的REE特征表明,成矿作用伴随有大量的流体参与；矿化斑岩与区内侵入相岩石相同的形成时代以及矿化斑岩中锆石C... |
| 关 键 词： | 龙头山金矿 U- Pb年代学 地球化学 成矿作用 华南成矿带 |
| 收稿时间： | 2010/12/21 0:00:00 |
| 修稿时间： | 5/3/2011 6:27:29 PM |
Correlations of the Late Yanshanian Tectonomagmatic Events with Metallogenesis in South China: Geochemistry Constraints from the Longtoushan Gold Ore Deposit of the Dayaoshan Area, Guangxi Province |
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| Duan Rui Chun,Ling Wenli,Li Qing,Chen Ziwan,Liu Lifen and Yang Hongmei.Correlations of the Late Yanshanian Tectonomagmatic Events with Metallogenesis in South China: Geochemistry Constraints from the Longtoushan Gold Ore Deposit of the Dayaoshan Area, Guangxi Province[J].Acta Geologica Sinica,2011,85(10):1644-1658. | |
| Authors: | Duan Rui Chun Ling Wenli Li Qing Chen Ziwan Liu Lifen and Yang Hongmei |
| Institution: | Wuhan Institute of Geology and Mineral Resources,Faculty of Earth Science, China University of Geosciences,Guangxi Bureau of Geology, Mineral Prospecting and Exploitation,Faculty of Earth Science, China University of Geosciences,Hei Longjiang Institute of Geological survey,Wuhan Institute of Geology and Mineral Resources |
| Abstract: | The SW end of the southeastern coast polymetallic mineralization belt comprises the Dayaoshan golden metallogenic zone, the Guigang area in Guangxi province. The LA-ICP-MS U-Pb zircon dating for pyrite-mineralized porphyry of the Longtoushan gold deposit from this region yields a weighted mean 206Pb/238U age of 96.13.0Ma, which is consistent with the result obtained from nearby Pingtianshan pluton (96.20.4Ma) within analytical error. Host rock Sr isotope and zircon REE feature of the Longtoushan deposit reveal that the mineralization was coupled with massive fluid activity. The coeval ages of mineralized porphyry and intrusive rock and evidently higher Ce positive anomalies of zircons from the porphyry relative to those from the intrusion imply a rapid regional crust uplifting along with pronounced rise of oxygen fugacity in magmatic system. The two igneous suites show a Nd isotopic signature akin to the low Nd model age belt of South China, indicative of mantle-derived magma involvement. Accordingly, it is suggested that large-scale fluid upward migration, rapid crustal uplift, abrupt cooling of ore-forming fluid along deep-seated fault, and oxygen fugacity increasing are key factors resulted in the metallogenesis of the Longtoushan gold deposit. We thus propose that the low-angle subduction of Pacific plate derived large-scale fluid migration spread widely along the southeastern coast, while the underplating of mantle-derived magma resulted in the ascending of high-solubility mineralized fluid along the tectonic channels, which are the critical setting responsible for the large-scale metallogenesis along the southeastern coast of South China during the Mesozoic. |
| Keywords: | Longtoushan gold deposit U-Pb geochronology geochemistry metallogenesis metallogenic belt in South China |
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