桂西北世加金矿稀土元素特征及其成矿指示意义  

REE characteristics and Ore-forming Indicator of the Shijia Gold Deposit in Northwest of Guangxi

作　　者：刘远栋[1] 庞保成[1] 付伟[1] 吴荣华[1] 张敏[1] 秦娴[1] 

机构地区：[1]桂林理工大学地球科学学院,广西桂林541004

出　　处：《矿产与地质》2011年第4期317-323,共7页Mineral Resources and Geology

基　　金：广西研究生教育创新计划资助项目;编号:002504209011;广西重点实验室主任基金(挂科能07109011-Z006)

摘　　要：世加金矿位于龙川穹窿内,区内有大量辉绿岩出露,多呈环带状、不规则状沿背斜出露。金矿体主要产于辉绿岩岩体内部的断裂破碎带以及与C1y地层的断裂接触带中。矿床成矿期石英脉、蚀变辉绿岩矿石、C1y地层硅质岩以及新鲜辉绿岩样品的稀土元素特征表明,矿床成矿流体来自于深部,形成于辉绿岩成岩后期,与区内印支—燕山期的酸性岩浆活动有关;区内的热水沉积岩为主要的矿源岩。来自深部的成矿流体使矿源岩中的成矿物质活化转移,在物化条件有利部位沉淀成矿。辉绿岩在成矿过程中起的作用主要是它的侵入为成矿作用提供导矿和容矿构造,另一方面它也提供少量的成矿物质。The Shijia gold deposit is located in Longchuan dome. There is a large number of exposed diabase. Diabase occurs in circle-type or irregularly along the anticline. Gold ore mainly occur in fracture zone inside the diabase, or on contact zone between diabase and Cly stratum. The analysis on REE characteristics of quartz vein formed in metallogenic period.altered diabase ore,silicolites from C1y stratum and fresh diabase, shows that the ore-forming fluid of this deposit was come from deep part,and formed after the diabase. The fluid are related with acidic magma activity in Yanshanian period. The hot-water sedimentary rocks were the main source rocks. The ore-forming fliud made the metallogenic materials remobilization and transportation in the source rocks, and deposits in the location which have better physical and chemical conditions. In the process of mineralization,diabase supplied ore-fluid leading and ore-host fracture zone, also supplied a little material sources.

关 键 词：辉绿岩型金矿 稀土元素特征 成矿物质来源 成矿流体来源 桂西北地区 

分 类 号：P611[天文地球—矿床学]