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| 江西信丰桐木稀土矿区龙舌岩体的成岩时代及成矿条件分析 | |
| 引用本文： | 孙艳,李建康,陈振宇,陈郑辉,侯可军,赵正.江西信丰桐木稀土矿区龙舌岩体的成岩时代及成矿条件分析[J].大地构造与成矿学,2012,36(3):422-426. |
| 作者姓名： | 孙艳 李建康 陈振宇 陈郑辉 侯可军 赵正 |
| 作者单位： | 1. 中国地质大学(北京)地球科学与资源学院,北京100083;国土资源部成矿作用与资源评价重点实验室,中国地质科学院矿产资源研究所,北京100037 2. 国土资源部成矿作用与资源评价重点实验室,中国地质科学院矿产资源研究所,北京100037 3. 中国地质科学院,北京,100037 |
| 基金项目： | 中国地质大调查项目“南岭地区岩浆岩成矿专属性研究”，“我国重要矿产和区域成矿规律研究”，我国三稀金属资源战略调查—“我国三稀资源战略调查及综合”，国家深部探测技术与实验研究专项的“南岭成矿带地壳岩浆系统结构探测实验”课题，“南岭于都-赣县矿集区立体探测技术与深部成矿预测示范”课题 |
| 摘 要： | 选择赣南离子吸附型稀土矿床产地——龙舌花岗岩体开展了锆石LA-ICP-MS定年工作。研究结果表明,岩体中的锆石晶型较完整,环带明显,属于典型的岩浆锆石;龙舌岩体之中粗粒斑状黑云母花岗岩形成于加里东期(206Pb/238U加权平均年龄为457.5±1.7Ma,MSWD=0.39)。加里东期的花岗岩可能是扬子陆块与华夏陆块拼接的结果,该花岗岩含有褐帘石等易风化的富稀土副矿物,经受多起构造事件,断裂发育,加之地处温热气候,遭受强烈的风化作用,有助于形成离子吸附型稀土矿床,因此对南岭离子吸附型稀土矿床的形成具有重要贡献。 |
| 关 键 词： | LA-ICP-MSU-Pb法定年 龙舌岩体 加里东期 桐木稀土矿床 |
LA-MC-ICP-MS Zircon U-Pb Dating and Rare Earth Potential of the Longshe Granite in Ganzhou, Jiangxi Province |
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| SUN Yan , LI Jiankang , CHEN Zhenyu , CHEN Zhenghui , HOU Kejun , ZHAO Zheng.LA-MC-ICP-MS Zircon U-Pb Dating and Rare Earth Potential of the Longshe Granite in Ganzhou, Jiangxi Province[J].Geotectonica et Metallogenia,2012,36(3):422-426. | |
| Authors: | SUN Yan LI Jiankang CHEN Zhenyu CHEN Zhenghui HOU Kejun ZHAO Zheng |
| Institution: | 1.School of the Earth Sciences and Resources China University of Geosciences(Beijing),Beijing 100083,China;2.MLR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;3.Chinese Academy of Geological Sciences,Beijing 100037,China) |
| Abstract: | The Longshe granite located in Ganzhou,Jiangxi province,whose weathering crust bears ion exchangeable rare earths,was dated using LA-MC-ICP-MS zircon U-Pb method.The zircons from the medium-coarse grained prophyritic biotite granite are euhedral crystals with oscillatory zoning on CL images.LA-MC-ICP-MS zircon U-Pb determinations yield a weighted mean 206Pb/238U age of(457.5±1.7) Ma(MSWD=0.39),suggesting that the granite was formed in Caledonian during the convergence between the Yangtze and Cathaysia blocks.In Nanling district,the Caledonian intrusions have great contribution to the formation of ion exchangeable REE resources.The Caledonian intrusions bearing REE-rich accessory minerals(such as allanite) experienced multistage faulting have developed thick weathering crusts under subtropical conditions,which are very promising for the formation of ion exchangeable rare earth element deposits. |
| Keywords: | LA-MC-ICP-MS zircon U-Pb Longshe granite Caledonian Tongmu REE deposit |
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