湖南芙蓉矿田成岩成矿时代  

The Rock-forming and Ore-forming Age of the Furong Orefield,Hunan Province

作　　者：罗郧[1] 蔡锦辉[1] 

机构地区：[1]中国地质调查局宜昌地质矿产研究所,湖北宜昌443003

出　　处：《地球学报》2004年第2期239-242,共4页Acta Geoscientica Sinica

基　　金：中国地质调查局地质调查项目"华南成矿区成矿规律和找矿方向综合研究"项目资助

摘　　要：芙蓉锡多金属矿田位于湘南的骑田岭南部。岩浆岩的含矿性普遍较好 ,一般都高于地球同类岩石的平均值 ,各花岗岩岩体的稀土特征相似 ,稀土配分曲线显示从中粗粒斑状花岗岩到中细粒斑状花岗岩、细粒黑云母花岗岩再到自交代现象发育的细粒花岗岩 ,δEu亏损逐渐加剧。同位素年龄资料证明 ,芙蓉矿田的成岩成矿时代为燕山早期。矿田综合信息反映出矿化可能与细粒花岗岩关系更密切。The Furong Sn-polymetallic ore deposit is located in southern Qitianling,south Hunan Province. The ore potential of magmatites is rather promising, generally higher than the average potential of the same type of magmatites in the world. The REE cha-racteristics of various granite bodies are similar,and the distribution of REE in the magmatites displays the increasing depletion of δEu from middle-coarse grained granite through fine-grained biotitite granite to fine-grained granite subjected to autometasomatism. The distribution of REE between the cassiterite-bearing massive magnetite ore and the cassiterite-arsenopyrite sulfide ore shows the same feature,suggesting that the ores and the magmatite bodies might have resulted from cogenetic igneous evolution. The isochron studies prove that the rock-forming time is early Yanshanian,and the comprehensive information shows that the ore-forming process is most intimately related to the fine-grained granite.

关 键 词：湖南 芙蓉矿田 成岩时代 成矿时代 锡多金属矿田 

分 类 号：P618.44[天文地球—矿床学]