广西新路-水岩坝钨锡矿田的成因探讨
A genetic study of Xinlu-Shuiyanba W-Sn orefield, northeast Guangxi
查看参考文献33篇
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文摘
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广西新路-水岩坝钨锡矿田位于广西平桂地区、燕山中期姑婆山花岗岩的西南接触带,为南岭钨锡多金属成矿带的重要组成部分.文章在前人成果基础上,进行了岩石地球化学、石英流体包裹体成分及Rb-Sr同位素定年等研究,结果表明,该区成矿作用(约151 Ma)与姑婆山花岗岩主体(161～165 Ma)存在较大的年龄差,因此没有直接的成因联系.姑婆山花岗岩形成后,由于进一步的断裂活动和幔源物质上升在姑婆山南缘形成了晚期花岗质小岩体,伴随的深源流体活动造成了W、Sn等成矿物质的活化、运移和富集,才形成了以六合坳、烂头山为代表的矿床.矿床受晚期成矿花岗岩、有利赋矿层位及断裂构造等因素的综合控制,成矿物质主要来源于花岗岩.激光拉曼探针分析显示,该区矿床流体包裹体的成分主要为CO_2、CH_4和H_2O,结合其他特征,显示可能有较多幔源成分参与,其中新路六合坳矿床流体包裹体极富CH_4,而水岩坝烂头山矿床流体包裹体富CO_2,反映了两者在流体来源、形成机制、成矿深度等方面的差异. |
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其他语种文摘
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Situated at the southwestern outer contact zone of the Middle Yanshanian Guposhan granite pluton in Pinggui area of Guangxi, the Xinlu-Shuiyanha W-Sn deposit is one of the representative W-Sn-polymetallic orefields in the Nanling Range, South China. Based on the data obtained from previous researches, this paper has studied systematically petrochemistry, Rb-Sr isotopic age dating and fluid inclusion compositions of the quartz, and the results show that the ages of the ore deposits are about 136 Ma, quite different from the age of the host granite of Guposhan, which was dated at (161～165) Ma, It is thus considered that there is no direct relationship between the granite emplacement and the ore formation. There occurred an intrusion of a late small granite body at about 151 Ma in the southern part of Guposhan granite pluton, which was probably caused by the further rupture of the crust and the upwelling of mantle material. The activity of associated mantle-derived fluids stimulated the mobilization, transportation and enrichment of W, Sn and other ore-forming elements and resulted in the formation of the Liuheao and Lantoushan ore deposits as representative ones;.; It is suggested that the ore deposits are controlled by late granite as well as favorable strata and structures, and the ore materials were mainly derived from late granite. Researches on oxygen, hydrogen and sulfur isotopes show that δ~(18)O values are 8.1‰～ 13.38‰ and 10.2‰～12.35‰ for Liuheao and Lantoushan ore deposits, respectively, and δ~(34)S values are -2.09‰～1.7‰ and 0.95‰～3.6‰, respectively, indicating that ore-forming elements were dominantly derived from the granite. Laser Raman microprobe analyses show that CO_2, CH_4 and H_2O constitute the dominant part of the fluid inclusions in these ore deposits. Combined with other characteristics, it is suggested that ore-forming fluids were dominantly derived from the mantle. In addition, the fluid inclusions in the Liuheao ore deposit have rich CH_4, while those of the Lantoushan ore deposit have abundant CO_2, probably implying the differences of their fluid source, ore-forming process and mineralization depth. |
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来源
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矿床地质
,2007,26(3):265-276 【核心库】
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关键词
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地质学
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钨锡矿田
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成矿流体
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矿床成因
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新路-水岩坝
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广西
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地址
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花岗岩火山岩及成矿理论研究所, 内生金属矿床成矿机制研究国家重点实验室, 江苏, 南京, 210093
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0258-7106 |
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学科
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地质学 |
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基金
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国家自然科学基金项目
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国家973计划
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文献收藏号
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CSCD:2830997
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