| 超大型钨多金属矿床成矿特殊性──以湖南柿竹园矿床为例 |
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| 引用本文： | 毛景文.超大型钨多金属矿床成矿特殊性──以湖南柿竹园矿床为例[J].地质科学,1997,32(3):351-363. |
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| 作者姓名： | 毛景文 |
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| 作者单位： | 中国地质科学院矿床地质研究所, 北京100037 |
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| 摘 要： | 柿竹园超大型钨多金属矿床形成具有一系列特殊因素:三期高度分异花岗质岩浆的先后叠加,并同为高热花岗岩,前两期又为BELIF花岗岩。与三期花岗岩有关,形成了三大成矿系统。这三大成矿系统内的多级次接触交代一退化蚀变、多层次裂隙控矿及泥质大理岩的屏蔽作用,导致成矿物质的最大富集和有效保存,以致于形成巨大的含矿矽卡岩体,退化蚀变岩和云英岩。NE和EW向两组深大断裂交织致使热流上涌及花岗质岩浆的多期定位,使柿竹园地区在70多百万年时期保持着高温度环境,这不仅有益于各期岩浆的分异演化和期后成矿,还利于形成热水对流系统,将原分散在地层岩石中的成矿元素活化、运移和沉淀。另外,地球物质分布不均一性及华南地区地质成矿发展历史揭示出燕山期在湘南地区必然形成超大型钨多金属矿床。
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| 关 键 词： | 钨矿床 多金属矿床 成矿特征 成矿系统 |
| 收稿时间： | 1996-02-15 |
METALLOGENIC SPECIALITY OF SUPER GIANT POLYMETALLIC TUNGSTEN DEPOSIT: TAKING THE SHIZHUYUAN DEPOSIT AS AN EXAMPLE |
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| Mao Jingwen.METALLOGENIC SPECIALITY OF SUPER GIANT POLYMETALLIC TUNGSTEN DEPOSIT: TAKING THE SHIZHUYUAN DEPOSIT AS AN EXAMPLE[J].Chinese Journal of Geology,1997,32(3):351-363. |
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| Authors: | Mao Jingwen |
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| Institution: | Institute of Mineral Deposits, Academy of Geological Sciences, Beijing 100037 |
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| Abstract: | The Shizhuyuan polymetallic tungsten deposit is a super giant deposit which owns huge resevers of tungsten, bismuth, beryllium, tin, molybdenum, fluorine, lead, zinc and silver. There are a series of specialities for its ore-formng processes. Three episodes of strong differentiated Yanshanian granites are spatially superimposed on one small area. All of the three episodes of the granites are recognized as high heat production granite, since highly enriched in radiometric elements. And the former two episodes of granites are also named as BELIF granite, a sort of tin and tungsten-rich granite, because of their high enrichment in beryllium, lithium, and fluorine. There develop three metallogenic systems in the Shizhuynan mine genetically associated with the three episodes of granites Due to multiple contact metasomatism, retrograde alteration, complicated ore-forming fractures, and overlying argillaceous marble over the metallogenic systems acting as shielding layers for ore-bearing skams, retrograde altered rocks and greisens. Two deep faults striking NE and EW cross at the Shizhuyuan area, and act as channels for granite emplacement and upwelling heat fluid. The measurements of whole rock R1rSr is}ochron and 40Ar-39Ar radiometric age measurements for the gramites indicate that the Shizhuyuan area kept a high heat environment over 70 to 80 Ma during Yanshanian time. These characters are of benefit not only to differentiated evolution for granites and postmagmatic metallogenesis, but also to forming a series of convection-circulation systems of hydrothemoal solution which may extract, move, and deposit some ore-forming elements from the surrounding strata. |
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