DOI:
矿床地质:1988,Vol.>>Issue(4):33-41

香花岭矿田矿床成矿分带及其成因探讨
中国地质科学院矿床地质研究所
Metallogenic zoning and genesis of the Xianghualing orefield
()
本文二维码信息
码上扫一扫!

摘要
图/表
参考文献
相似文献

摘要点击次数: 1884   全文下载次数: 1532   点此下载全文
        
中文摘要:本文概括了香花岭矿田的矿化分带型式,并从不同形态矿体在空问上的组合、矿化元素的空间分布及富集规律、矿物共生组合的空间分布及金属矿物中微量元素的含量变化等方面讨证了矿床的分带型式。作者认为,多次的构造岩浆活动和成矿的多阶段性、矿液性质的演化和成矿物理化学条件的规律变化,是产生矿化分带的主要原因。
中文关键词:矿田  矿化分带  锡多金属矿床  香花岭
Abstract:The Xianghualing orefield, a well-known rare and nonferrous metals orefield in South China, is noted for its very typical metallogenic zoning in the depressed area of Nanling region. In the orefield, the intrusion of three granite stocks into Cambrian sandstone and Devonian carbonate rocks along the intersections of NE-trending and NW-trending faults resulted in the formation of three corresponding mineralization districts. Around the ore-bearing granite bodies, different types of ore deposits are in regular zoned distribution as follows: Nb-, Ta-deposits of magmatic type in the upper part of the granite bodies and W, Sn(Be)deposits of greisen type at the top of the granite bodies→Sn, W, Be deposits of metasomatic type near the contact zone→Sn, W deposits of metasomatic-hydrothermal type at the exocontat zone→Pb, Zn deposits of hydro- thermal type far away from the contact zone, with the correponding zonation of metallogenic elements being REE, Nb, Ta, Sn, W(Be)-Sn, W, Be-Sh, W(Pb, Zn)-Pb, Zn-Pb, Zn, Sb(Ag). In the same ore deposit, the differences in ore-controlling structures and lithologic characters of the wall rocks have led to the regular upward variation of the orebody shapes from stratoid through pipe-like to veinlike. In addition to the lateral zoning of metallogenic elements within an ore deposit, such as the zoning of Sn(W) →Sn, Be(W) →Sn, Pb, Zn→Pb, Zn, Sb in the Xianghuajing tin polymetallic deposit, the concentration position and extent of the major elemerits also show regular variation with the change in ore-controlling structures and the distance from the granite body. The ore-forming processes of the tin-polymetallic ore deposits might be divided into four main stages which gave birth to eight sorts of mineral asselublages. During the mineralization, the metallic minerals were precipitated approximately in order of oxides-sulfides-sulfosalts. The early stage mineral assemblages are distributed near the granite contact zone, while the late stage ones occur somewhat away from the contact zone or are superimposed on the early ones. In ore minerals, the cassiterite magnetite, sphalerite and galena, which were formed at different stages, also display certain regular variation in their major element contents. The authors consider that the repeated structuraj and magmatic activities must have been the major factor leading to the metallogenic zoning in the area in that these activities not only caused the formation of vertical and horizotntal zoning for structural elements and their combinations, but also stimulated the repeated pulsating diffusion of ore fluids towards the fatflts and fissures. The evolution of the properties of ore fluids seems to be another factor causing the formation of metallogenic zoning. From the early ore-forming stage to late, the temperature and salinity of the ore fluids decreased gradually, accompanied by corresponding variation in acidity and chemical potential of the volatiles. Ore fluids with differnt properties precipitated corresponding distinct mineralassemblages. These assemblages are arranged in order of time and space and thus make up the metallogenic zoning that we see today.
文章编号:    
中图分类号:     
文献标志码:

引用文本:
张德全,王立华.1988.香花岭矿田矿床成矿分带及其成因探讨[J].矿床地质,7(4):33~41
.1988.Metallogenic zoning and genesis of the Xianghualing orefield[J].Mineral Deposits7(4):33~41
图/表
您是第241657082位访问者  京ICP备05032737号-5  京公网 安备110102004559
主管单位:中国科学技术协会 主办单位:中国地质学会矿床地质专业委员会 中国地质科学院矿产资源研究所
地  址: 北京市百万庄大街26号 邮编:100037 电话:010-68327284;010-68999546 E-mail: minerald@vip.163.com
本系统由北京勤云科技发展有限公司设计 
手机扫一扫