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Isotope Tracing and Prospecting Assessment of Gold-Silver Deposits in Zhejiang Province 总被引:1,自引:0,他引:1
Chen Haoshou Xu Butai Department of Earth Sciences Zhejiang University Hangzhou Zhejiang Zhejiang Institute of Geology Mineral Resources Hangzhou Zhejiang Liu Xinzhu 《《地质学报》英文版》1997,71(3):293-304
Three different types of gold and silver deposits in Zhejiang Province(Huangshan gold deposit, Zhilingtou gold-silver deposit and Haoshi silver deposit) showmarked differences in lead and strontium isotopic composition, suggesting three differentsources and geneses of these deposits. The Huangshan gold deposit features low initial Srisotope ratios and low μ values or low content of radiogenic Pb and its ore-forming materialscame primarily from the upper mantle; the Zhilingtou gold-silver deposit shows high initial Srisotope ratios and high μ values or high content of radiogenic Pb and the ore-forming materialswere derived mainly from the upper crust; and the Haoshi silver deposit has its Pb and Srisotope ratios between the above two cases with the ore-forming materials stemming from boththe mantle and the crust. The characteristic Pb isotopic composition may serve as an indicatorfor prospecting for different types of ore deposits. 相似文献
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"改造成矿作用"是涂光炽院士提出的新理论。这一理论有如下基本论点和鲜明特色:矿质来源的广泛性;成矿流体的特殊性;成矿元素的活泼性;改造作用的内生性;断裂构造的主导性;赋矿岩石的多样性;改造矿床的普遍性;成矿作用的独特性与应有地位——矿床分类的四分法。滇中大姚-牟定式砂岩铜矿是典型的沉积-成岩-后生-改造成因。其主要论据与以下要素有关:裂谷成矿背景;矿源层(K、J)、矿源岩(元谋古陆);矿体受地层层位、岩相、岩性控制,其生成与煤系(提供有机质)、盐层(提供卤素)密切相关;矿体形态产状、矿石结构构造、成矿流体性状与水的来源、有机质类型及其作用在不同成矿期、成矿阶段显著不同。从岩石学的名词概念来解读和划分"改造成矿作用"的上限与下限:上限确定在后生作用之后,下限在变生作用之末。 相似文献
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浙江主要金银(铅、锌)矿床同位素地球化学研究 总被引:2,自引:0,他引:2
应用Rb-Sr等时线法测定了浙江不同类型金、银矿床(璜山金矿、治岭头金银矿、毫石银矿及拔茅、大岭口含银铅锌矿)的成矿时代。不同类型矿床的Sr、Pb同位素组成有显著的差别表明其成矿物质有不同的来源和成因。特征的Pb同位素组成还可以作为不同类型矿床的找矿标志。 相似文献
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海南金矿成矿作用年代学 总被引:3,自引:0,他引:3
本文对海南二甲和不磨金矿区的围岩和矿石进行了年代学研究。结果:二甲和不磨金矿区的围岩和矿石的年龄主要在220~390Ma之间,表明主要的混合岩化,糜棱岩化作用和金矿化作用发生在海西—印支期,以印支期为主,燕山期构造运动和矿化作用的迭加改造对金矿的富集有一定影响。 相似文献
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应用Rb-Sr等时线法测定了浙江3种不同类型的金、银矿床(璜山金矿、治岭头金银矿、毫石银矿)的成矿时代。璜山金矿床的年龄为358Ma~397Ma,治岭头金银矿床的年龄为127Ma~165Ma,毫石银矿床的年龄为104Ma。3个矿床的铅、锶同位素组成有显著差别,反映了3个矿床的不同来源和成因。璜山金矿床具有低初始锶比值和低μ值或低放射成因铅,主要来自上地幔源区;治岭头金银矿床具高初始锶比值和高μ值或高放射成因铅,以上地壳来源为主;毫石银矿床的铅、锶同位素比值介于上述两者之间,为壳幔混合来源。特征的铅同位素组成可以用作寻找不同类型矿床的标志。 相似文献
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广东玉水-银屎富铜多金属矿带同位素地球化学找矿研究 总被引:1,自引:0,他引:1
玉水-银屎铜多金属矿带是粤东北重要的铜、铅锌、金、银等多金属成矿远景区(带)之一。已发现铜、铅锌、金、银、铁、锰等矿床、矿点多处,其中玉水铜矿、银屎铅锌矿是近几年发现并评价的富铜、铅锌中型矿床,在这两个矿床的外围还有若干矿点及异常区。本文应用铅、硫及碳氧同位素示踪,对玉水-银屎矿床及其外围若干矿点及远就(异常)区进行对比研究,在阐明矿床成因、物质来源、成矿时代、演化历史的基础上,总结已知矿床和矿点的同位素特征,提出找矿评价的稳定同位素标记,对远景区(异常区)进行找矿评价。 相似文献
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Xu Butai Li Changjiang Zhejiang Institute of Geology Mineral Resources Hangzhou Zhejiangand Chen Haoshou Department of Earth Sciences Zhejiang U niversity Hangzhou Zheyang Liu Xinzhu 《《地质学报》英文版》1995,69(1):69-83
In the Xinchang-Yongjia silver (lead-zinc) ore belt, there mainly occur the large to medium-sized Haoshi, Bamao, Dalingkou and Wubu silver deposits or silver-bearing lead-zinc deposits. On the basis of researches on these typical deposits, the mechanism of leaching-drawing mineralization of Mesozoic geothermal water and the related model are put forward in this paper in the light of the time interval between rock and formation ages as well as hydrogen, oxygen, sulphur and lead isotope geochemical characteristics. The major metallogenic process occurred in volcanic rock layers. The ore-forming fluids are geothermal water coming from meteoric water and circulating at shallow layers. This geothermal water leached and absorbed ore-forming materials from its country rocks during its flowing (such metallogenic elements as silver, lead-zinc and sulphur mainly came from consolidated volcanic rocks), leading to the formation of meso - epithermal silver deposits. 相似文献