赣西北石门寺钨矿似斑状黑云母花岗岩的控矿作用及找矿意义

发布时间：2018-06-04 03:19

本文选题：控矿作用 + 找矿意义　；参考：《科学技术与工程》2016年03期

【摘要】：赣西北武宁县石门寺钨矿是大湖塘世界级超大型W-Cu-Mo多金属矿集区的重要组成部分,其钨资源量占矿集区钨资源总量的67%,其中细脉浸染型钨矿体占矿区钨矿总储量的74%,是矿区最重要的矿化类型。石门寺细脉浸染型钨矿产于燕山期似斑状黑云母花岗岩的内外接触带,与似斑状黑云母花岗岩的成岩时间一致,矿石硫同位素显示成矿物质来源于岩浆,反映似斑状黑云母花岗岩为细脉浸染型钨矿提供了钨金属,控制了矿体的成矿时间和产出空间。石门寺矿区似斑状黑云母花岗岩的源岩双桥山群含钨量高达9.16×10-6,部分熔融时钨金属趋于进入岩浆。富钨岩浆发生结晶分异,残留岩浆中钨金属得到进一步富集,该残留岩浆汇集到岩体顶部,出溶成矿流体。岩浆出溶的成矿流体使围岩晋宁期黑云母花岗闪长岩和燕山期的似斑状黑云母花岗岩发生云英岩化,导致岩石中铁、锰和钙等元素析出;这些铁、锰和钙与成矿流体中的钨金属结合,形成细脉浸染状黑钨矿和白钨矿。似斑状黑云母花岗岩的内、外接触带是矿体产出的空间,云英岩化的范围指示矿体产出的位置,岩体接触带和云英岩是找矿的直接标志。紧邻矿体的、产于似斑状黑云母花岗岩顶部的具有流体出溶性质的似伟晶岩壳岩性特征明显,野外极易辨认,可作为找矿的标志层。富钨的高分异S-型花岗岩小岩体及控岩构造是找矿的区域标志。
[Abstract]:The Shimensi tungsten deposit in Wuning County, northwest of Jiangxi Province, is an important part of the world class W-Cu-Mo polymetallic ore accumulation area in Dahutang. The tungsten resources account for 67% of the total tungsten resources in the ore concentration area, in which the vein-impregnated tungsten ore body accounts for 74% of the total reserves of tungsten ore in the mining area, which is the most important type of mineralization in the mining area. The Shimensi vein disseminated tungsten deposit occurred in the inner and outer contact zone of Yanshanian porphyry biotite granite, which is consistent with the diagenetic time of porphyry biotite granite. The ore sulfur isotope shows that the ore-forming material originates from magma. The results show that the porphyry biotite granites provide tungsten metal for the vein-impregnated tungsten ore and control the ore-forming time and production space of the orebody. The source rock Shuangqiao Mountain Group of the porphyry biotite granite in the Shimensi mining area contains as much as 9.16 脳 10 ~ (-6) tungsten, which tends to enter the magma during partial melting. Tungsten rich magma is characterized by crystallization differentiation and further enrichment of tungsten metal in residual magma. The residual magma accumulates to the top of the rock mass to produce dissolved ore-forming fluid. The magmatic dissolution of the ore-forming fluid causes the occurrence of greytonitization in the surrounding rocks of the Jinning period biotite granodiorite and the Yanshanian porphyry biotite granite, resulting in the precipitation of iron, manganese and calcium in the rocks. Manganese and calcium combine with tungsten metal in ore-forming fluid to form vein-disseminated wolframite and scheelite. The inner and outer contact zone of porphyry biotite granite is the space of orebody production, the range of quartz petrolization indicates the location of orebody, the contact zone of rock mass and the quartzite rock are the direct sign of prospecting. Adjacent to the orebody and occurring on the top of porphyry biotite granite, the lithologic characteristics of fluid-solubilized pegmatite crust are obvious and easy to be recognized in the field, which can be used as a marker for prospecting. The small rock mass and controlling rock structure of high grade S-type granite rich in tungsten are the regional indicators of prospecting.
【作者单位】：中国地质大学(北京)地球科学与资源学院;东华理工大学省部共建核资源与环境国家重点实验室培育基地;中国地质科学院地质研究所;江西地质矿产局赣西北地质大队;
【基金】：国家科技支撑计划项目(2011BAB04B02) 中国地质调查局项目(1212011220248) 教育部核资源与环境重点实验室开放基金项目(NRE1209)资助
【分类号】：P618.67

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