湖南锡田钨锡多金属矿田成矿分带样式及机理

来源期刊:中南大学学报(自然科学版)2018年第3期

论文作者:吴堑虹 刘飚 奚小双 孔华 蒋江波 林智炜 曹荆亚

文章页码:633 - 642

关键词:矿化分带;矿物组合;均一温度;稀土配分模式;锡田矿田

Key words:mineralization zone; mineral association; homogenization temperature; REE distribution pattern; Xitian orefield

摘    要:为了探索锡田矿田内矿床分布规律及其成矿热液系统内在联系,对区内燕山期14个岩浆热液矿床野外特征进行调查和显微矿相学观察,采用将矿化类型、矿石矿物组合和成矿均一温度相结合的方法对区域矿化规律进行研究。研究结果表明:矿田内存在南、北2个成矿区域,各自拥有独立成矿热液中心,并且存在明显的钨锡—铅锌—萤石矿床分带规律;流体包裹体均一温度的空间分布与矿化分带相一致,从钨锡矿带(215~384 ℃)到萤石矿带(136~194 ℃)连续分布;南、北2个成矿区域白钨矿稀土元素特征均为轻、重稀土元素富集,中稀土亏损,正Eu异常明显(δw(Eu)=7.93~43.58),稀土配分模式均为典型“W”型,反映成矿物质来源相似;其成矿热液来源为同一燕山期成矿热液系统,其矿化分带的原因可能与燕山期岩浆热液系统温度梯度格局有关。

Abstract: In order to understand the distribution disciplinarian of ore deposits and their genetic relationship in Xitian ore-forming system, fourteen Yanshanian magmatic-hydrothermal deposits were studied through geological survey and microscopic mineralogy observation. The distribution of mineralization type, ore mineral association and homogenization temperature of fluid inclusions in Xitian orefield were determined. The results show that there are two ore-forming regions distributed in the southern and northern Xitian area, respectively, and each of the region has its own hydrothermal center with a clear regular zone mineralization distribution of W-Sn,Pb-Zn and fluorite deposits. Homogenization temperature of fluid inclusions is consistent with mineralization zone in term of spatial distribution. The temperature decreases continuously from W-Sn deposits (215-384 ℃) to fluorite deposits (136-194 ℃). Two ore-forming systems show high concentrations of LREE and HREE, low concentrations of MREE, obvious positive Eu anomalies (δw(Eu)=7.93-43.58), and the W-type chondrite-normalized REE patterns. Combined with S and Pb isotopic data and mineralization age in the orefield, these ore deposits are formed in the Yanshanian magmatic-hydrothermal event with similar source of mineralizing components, and the minerogenic zoning patterns may be constrained by the thermal gradient pattern of the magmatic-hydrothermal system.

相关论文

  • 暂无!

相关知识点

  • 暂无!

有色金属在线官网  |   会议  |   在线投稿  |   购买纸书  |   科技图书馆

中南大学出版社 技术支持 版权声明   电话:0731-88830515 88830516   传真:0731-88710482   Email:administrator@cnnmol.com

互联网出版许可证:(署)网出证(京)字第342号   京ICP备17050991号-6      京公网安备11010802042557号