广西五圩矿田成矿温度变化及找矿方向分析
Ore-forming temperature variation and prospecting target of the Wuxu ore field in Guangxi
查看参考文献36篇
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文摘
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五圩矿田位于丹池锡多金属成矿带的南东端,发育一系列Zn-Sb-Hg-As矿床,具有良好找矿潜力。本文分析了五圩矿田八达Zn-Sb矿床、芙蓉厂Sb矿床及箭猪坡Zn-Sb-Pb-Ag矿床包裹体组成及均一温度和闪锌矿微量元素组成。八达矿床闪锌矿6个分析点Fe含量在0.13%~0.27%之间,平均为0.20%, Zn/Cd比值在81~158之间,平均103;箭猪坡矿床闪锌矿37个分析点Fe含量在1.18%~7.70%之间,平均为3.61%,27个分析点Zn/Cd比值在158~383之间,平均249。箭猪坡矿床闪锌矿的Fe含量和Zn/Cd比值比八达矿床的高,显示前者形成温度较高;矿床矿化石英及闪锌矿流体包裹体测温结果显示:芙蓉厂矿床的成矿温度主要集中于160~200 ℃,八达矿床的成矿温度集中于190~240℃,箭猪坡矿床的成矿温度集中于240~320℃。闪锌矿微量元素特征及成矿流体包裹体均一温度表明,从五圩矿田芙蓉厂矿床、八达矿床至其SSE向的箭猪坡矿床,成矿温度逐渐增高。成矿流体包裹体富含CO_2、CH_4、沥青质等有机物且均一温度最高达350 ℃等,表明五圩矿田成矿流体主要来源于盆地热卤水及混合部分高温流体。这表明五圩矿田深部存在一个高温热源,其中心位置应位于箭猪坡矿床的SSE方向,而不是过去认为的NNW方向区域,今后应注意箭猪坡矿床SSE主向背斜轴部深部找矿工作。 |
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其他语种文摘
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The Wuxu ore field is tectonically located in the southeast of the Nandan-Hechi tin polymetallic metallogenic belt, and is characterized by a series of Zn-Sb-Hg-As deposits, showing good prospecting potential. We have analyzed composition and temperature of inclusions and composition of trace elements in sphalerites from the Bada Zn-Sb deposit, the Furongchang Sb deposit and the Jianzhupo Zn-Sb-Pb-Ag deposit in the Wuxu ore field. It is found that the Fe content of sphalerites (for 6 samples) from the Bada deposit ranges from 0.13% to 0.27% with an average of about 0.20%, and the Zn/Cd ratios range from 81 to 158 with an average of about 103; the Fe content of sphalerites (for 37 samples) from the Jianzhupo deposit ranges from 1.18% to 7.70% with an average of about 3.61%, and the Zn/Cd ratios rang from 158 to 383 with an average of 249. The Fe content and Zn/Cd ratios of sphalerites from the Jianzhupo deposit are higher than those from the Bada deposit, showing that the former was formed at higher temperatures. The homogeneous temperature of fluid inclusions in mineralized quartz and sphalerites of the ore deposits shows that the Furongchang deposit, the Bada deposit and the Jianzhupo deposit were mainly formed in the temperature ranges of 160 °C to 200 °C, 190 ℃ to 240 ℃ and 240 ℃ to 320 ℃,respectively. The sphalerite Fe content and Zn/Cd ratios and homogeneous temperature of ore-forming fluid inclusions all show that the mineralization temperature increases from the Furongchang deposit to the Bada deposit and to the Jianzhupo deposit in the Wuxu ore field. The ore-forming fluid inclusions of the three analyzed deposits in the Wuxu ore field are characterized by enrichment of CO_2, CH_4, asphaltene and other organics, suggesting that the ore-forming fluids were derived mainly from formation brine. Some high homogeneous temperature fluid inclusions (up to 350 ℃) were found in some of the deposits, suggesting that high temperature fluid was involved in the formation of the deposits in the Wuxu ore field and that the mineralization of the Wuxu ore field was triggered by high temperature sources that occurred in the deep localities of the ore field. Based on that the mineralization temperature increases systematically from the Furongchang deposit in the northwest to the Jianzhupo deposit in the southeast, it is reasonable to conclude that the heat sources that resulted in the mineralization of the Wuxu ore field were located in the southeastern domain of the Jianzhupo deposit and that the anticline axis in the southeastern domain of the Jianzhupo deposit could be the future prospecting target. |
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来源
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地球化学
,2015,44(6):546-555 【核心库】
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关键词
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微量元素
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流体包裹体
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闪锌矿
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找矿方向
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广西五圩矿田
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地址
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中国科学院广州地球化学研究所, 中国科学院矿物学与成矿学重点实验室, 广东, 广州, 510640
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广西大学资源与冶金学院, 广西, 南宁, 530004
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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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0379-1726 |
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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
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广西壮族自治区八桂学者专项资金
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文献收藏号
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CSCD:5571946
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