老挝爬奔金矿成矿作用与成矿演化  

Mineralization and metallogenic evolution of the Phapon gold deposit,Laos

作　　者：薛兰花 史老虎 

机构地区：[1]天津华勘矿业投资有限公司,天津300171

出　　处：《地质调查与研究》2016年第3期191-197,203,共8页Geological Survey and Research

基　　金：老挝琅勃拉邦省巴乌县金铜多金属矿普查和详查(201211B00200006)

摘　　要：爬奔金矿位于老挝北部琅勃拉邦岛弧带中段,矿体赋存于石炭-下二叠统的厚层-巨厚层灰岩NNW向断裂带中。目前圈定的6条矿体,呈大脉状产出,构造交汇部位呈透镜状和囊状。矿石矿物成分简单,以铁氧化物为主。金以粒间金和裂隙金赋存于方解石等脉石矿物中。本文在前人研究的基础上,通过野外调查,对不同期方解石脉进行观察分类,结合岩矿石常微量元素的分析对比,研究剪切作用下流体起源与金属活化机制,探讨构造、流体、成矿的时空关系及控矿机制。结果表明:爬奔金矿成矿物质来源于石炭-下二叠统的灰岩,金的迁移以氯的络合物形式进行,成矿温度低、属浅成低温脉型矿床。构造动力贯穿整个成矿过程,起主导作用,成矿演化分为三期七个阶段,成矿期的四个阶段是同一动力作用下递进变形在同一构造位置的同位叠加成矿,形成不同的碳酸盐化及独特的矿化蚀变标志,找矿指示意义重大,可以作为该类型矿床独特的找矿标志,指导外围找矿工作。Phapon gold deposit is located in the central of Laungprabang island arc in north of Laos. Ore body occurs in NNW striking faults of thick-huge thick limestone of Carbonic-Lower Permian. It is delineated by 6 ore bodies at present, appears as large pulse. The tectonic intersection parts are in lentoid and cryptomere. The mineral composition is simple, rare metallic minerals, take iron oxide as principal. The gold occurs in calcite and other gangue mineral as intergranular and fractured. On the basis of former investigation, through field geological investigation, I observe and classify on different stages of calcite vein, combine analyze and comparison on mineral microelement, study on the origin of fluid and the activation of metal under shear, investigate on the time and space relationship and ore-controlling mechanism among constructed, fluid and mineralization. The research indicated that Phapon gold metallogenic material is from limestone of Carbonic-Lower Permian, the gold migration is by chloric complex, the mineralization temperature is low, which is epithermal vein-type deposits. Construct power throughout the mineralization process, and play a leading role. Metallogenic evolution is divided into three periods, including seven stages. Four stages of mineralization is progressive deformation under the same dynamic action superimposed mineralization in the same position in the same structural position, and form different carbonation and unique mineralization and alteration mark. With significance indicated on prospecting, it can be the unique mineralization mark of the deposit type and guide for periphery prospecting.

关 键 词：成矿作用 成矿演化 爬奔金矿 老挝 

分 类 号：P618.51[天文地球—矿床学]