| 粤东仙水沥Sn-W矿床地质特征及成岩成矿年代学研究 |
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| 引用本文： | 姚薇,钱龙兵,杨瀚文,甘黎明,冯博鑫.粤东仙水沥Sn-W矿床地质特征及成岩成矿年代学研究[J].岩石学报,2021,37(3):733-746. |
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| 作者姓名： | 姚薇 钱龙兵 杨瀚文 甘黎明 冯博鑫 |
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| 作者单位： | 中国地质调查局西安矿产资源调查中心, 西安 710100;广东省有色金属地质局九三一队, 汕头 515041 |
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| 基金项目： | 本文受国家自然科学基金项目（41902072）和中国地质调查局地质调查项目（DD20190166-2020-06）联合资助. |
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| 摘 要： | 近年来,粤东沿海地区新识别出一期早白垩世锡多金属成矿事件,但关于区内矿床类型仍然存在争议,包括与高分异花岗岩有关和动力变质热液成因。仙水沥Sn-W矿位于粤东沿海莲花山动力变质带,前人研究认为该矿床类型为动力变质热液成因。本文在详细介绍了仙水沥矿床地质特征的基础上,开展了锡石LA-ICP-MS U-Pb定年,并对空间上与矿化密切相关的黑云母花岗斑岩开展锆石LA-ICP-MS U-Pb定年,探讨了矿床成因。获得锡石U-Pb年龄为147.7±2.7Ma,2个黑云母花岗斑岩锆石U-Pb年龄为146.4±1.5Ma和146.0±1.4Ma,成岩成矿年龄在误差范围内一致,结合矿化蚀变空间关系,认为成矿与黑云母花岗斑岩密切相关。另外,还获得1个辉钼矿Re-Os模式年龄为118.5±3.2Ma,结合粤东地区最新研究进展,推测矿区可能存在一期白垩纪中期Mo矿化事件,并提出粤东沿海与闽浙沿海类似,可能发育白垩纪中期斑岩Cu-Mo矿成矿作用,区内具有寻找白垩纪中期斑岩Cu-Mo矿的找矿潜力。
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| 关 键 词： | 锡石U-Pb定年 Sn-W矿床 黑云母花岗斑岩 仙水沥 粤东沿海 |
| 收稿时间： | 2020/11/15 0:00:00 |
| 修稿时间： | 2021/2/9 0:00:00 |
Geological characteristics and geochronology of the Xianshuili Sn-W deposit, eastern Guangdong Province |
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| YAO Wei,QIAN LongBing,YANG HanWen,GAN LiMing,FENG BoXin.Geological characteristics and geochronology of the Xianshuili Sn-W deposit, eastern Guangdong Province[J].Acta Petrologica Sinica,2021,37(3):733-746. |
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| Authors: | YAO Wei QIAN LongBing YANG HanWen GAN LiMing FENG BoXin |
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| Institution: | Xi''an Center of Mineral Resources Survey, China Geological Survey, Xi''an 710100, China;931 Team, Geology Bureau for Nonferrous Metals of Guangdong Province, Shantou 515041, China |
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| Abstract: | Recently, an episode of Early Cretaceous tin polymetallic metallogenic event was newly recognized in the eastern Guangdong Province, but the ore genesis remains controversial including highly-fractionated granite-related and dynamometamorphic hydrothermal origins. The Xianshuili tin-tungsten deposit, located in the Lianhuashan dynamometamorphic belt, coastal eastern Guangdong Province, is regarded as dynamometamorphic hydrothermal mineralization. In this paper, based on the detailed investigation of the characteristics of ore deposit geology, we present cassiterite LA-ICP-MS U-Pb dating and zircon LA-ICP-MS U-Pb dating for biotite granite porphyry which displays a closely spatial relation with mineralization, in order to identify the ore genesis. LA-ICP-MS U-Pb dating yielded a cassiterite U-Pb age of 147.7±2.7Ma for the ore, and two zircon U-Pb ages of 146.4±1.5Ma and 146.0±1.4Ma for the biotite granite porphyry, which are consistent within uncertainty. In combination with the spatial relationship between mineralization and alteration, we suggest that the Xianshuili mineralization is genetically related to the biotite granite porphyry. In addition, a molybdenite Re-Os model age obtained implies a later stage of the Middle Cretaceous Mo mineralization. In combination with the research progress of the southeastern coastal belt, China, we propose that, similar to the coastal Fujian and Zhejiang provinces, the Middle Cretaceous Cu-Mo mineralization can also develop in the coastal eastern Guangdong Province, and there is potential for the Middle Cretaceous porphyry Cu-Mo exploration in the region. |
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| Keywords: | Cassiterite U-Pb dating Sn-W deposit Biotite granite porphyry Xianshuili Coastal eastern Guangdong Province |
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