| 浙江遂昌治岭头筒状铅锌矿体地质特征及成因 |
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| 引用本文： | 钱建民,濮为民,钟增球,林清贫.浙江遂昌治岭头筒状铅锌矿体地质特征及成因[J].大地构造与成矿学,2010,34(1). |
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| 作者姓名： | 钱建民 濮为民 钟增球 林清贫 |
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| 作者单位： | 中国地质大学(武汉)地球科学学院,湖北,武汉,430074;浙江省地球物理地球化学勘查院,浙江,杭州,310005;浙江省遂昌金矿有限公司,浙江,遂昌,323304;中国地质大学(武汉)地球科学学院,湖北,武汉,430074 |
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| 基金项目： | 国土资源部危机矿山接替资源勘查项目;项目编号 |
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| 摘 要： | 通过矿床地质特征、同位素和稀土地球化学特征的研究,认为浙江遂昌治岭头直筒状铅锌矿体为隐爆角砾岩型的铅锌矿,受直筒状的隐爆角砾岩控制,主矿元素Pb的平均品位自下而上逐渐升高,而Zn的平均品位则相反,具有下部Zn,上部Pb、Zn的分带性;直筒状铅锌矿的黄铁矿δ34S平均值为6.78‰,铅同位素:206Pb/204Pb平均值为17.986、207Pb/204Pb平均值为15.596、208Pb/204Pb平均值为38.893,δEu值0.53,稀土演化曲线与变质岩和上侏罗统火山岩相似;铅、硫同位素以及稀土地球化学特征表明,成矿物质来源较单一,与燕山期壳源重熔型花岗岩型火山活动有关,从矿石组合来看,表明了热液富含Mn,且含较丰富的S、F及碳酸根等阴离子,成矿为相对封闭的还原环境,成矿时代介于148.2±0.5～104.8±0.8Ma之间。
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| 关 键 词： | 治岭头 直筒状铅锌矿体 成矿时代 同位素 稀土 |
Geologic Characteristics and Genesis of the Zhilingtou Pipe-like Pb-Zn Deposit in Suichang, Zhejiang |
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| QIAN Jianmin,PU Weimin,ZHONG Zengqiu,LIN Qingpin.Geologic Characteristics and Genesis of the Zhilingtou Pipe-like Pb-Zn Deposit in Suichang, Zhejiang[J].Geotectonica et Metallogenia,2010,34(1). |
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| Authors: | QIAN Jianmin PU Weimin ZHONG Zengqiu LIN Qingpin |
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| Abstract: | The Zhilingtou mining area of Suichang, Zhejiang is in a state of limitation extraction due to reserves exhaustion for thirty years exploitation, and thus much work has been done to prospect for superseding resources in the depths and peripheral areas around the mine. A pipe-like lead-zinc deposit on middle scale was found with a special orebody form and a mean grade of 6%, which is of great geologic and economical significance. On the basis of the geological, geochemical and isotopic characteristics of the ore deposit, the lead-zinc deposit is characterized by cryptoexplosive breccias, controlled by a cryptoexplosive breccia pipe with vertical chemical zoing, that is, the Pb content increases from below to above while the zinc content is the opposite. The pyrites in pipe-like ores have an average δ~(34)S value of 6.78‰, with average ~(206)Pb/~(204)Pb, ~(207)Pb/~(204)Pb and ~(208)Pb/~(204)Pb ratio of 17.986, 15.596 and 38.893 respectively. The REE pattern resembles wall rocks and upper Jurassic volcanic rocks in the area, with δEu value of 0.53. The pipe lead-zinc deposit shows a single ore-forming material source, which might be related to the Yanshanian volcanism of crustal origin. Also, the mineral assemblage of the deposit indicates ore-forming hydrothermal solution is rich in Mn, S, F and carbonate ions, suggesting its formation in a relatively closed reducing environment, with a deposition age of 148～105 Ma. |
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| Keywords: | Zhilingtou pipe-like lead-zinc deposit metallogenic epoch isotope rare earth elements |
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