构造分析、遥感、物化探方法综合研究腾冲—梁河锡成矿区的控矿构造及隐伏矿床预测  

COMPREHENSIVE RESEARCH OF STRUCTURE ANALYSIS,REMOTE SENSING,METHODS OF GEOPHYSICAI AND GEOCHEMICAI PROSPECTING ON ORE-CONTROLLING STRUCTURES AND PROGNOSIS OF CONCEALED DEPOSITS IN THE TENGCHONG—LIANGHE TIN METALLOGENIC REGION

作　　者：徐成彦[1] 王豪[1] 刘粤湘[1] 孟宪国 

机构地区：[1]中国地质大学

出　　处：《云南地质》1991年第4期394-416,共23页Yunnan Geology

摘　　要：腾冲-梁河锡成矿区的基底为元古界—古生界,盖层为上古生界勐洪群。中-新生代时,本区作为密支那-曼德勒俯冲带及那加山-阿拉干俯冲带的仰冲盘,断裂活动强烈,多次岩浆侵入,有利于成矿。区内勐洪群中有硅质糜棱岩和混合岩,花岗岩中有长英质糜棱岩,反映了不同温压环境、不同层次的变形条件,而矿产则赋存于较浅层次的脆性环境。据成矿温度、包裹体成分、盐度等数据分析,表明来利山矿区高处的淘金处、三个硐、老熊窝三个矿段,与低处的丝光坪矿段不是同一演化系列。丝光坪的矿源属另一支岩体,矿体在剖面上呈斜列组合,深部及邻区具有成矿的可能性。小龙河锡矿与花岗岩密切相关,古永复式岩基多次的岩浆活动,锡又有很高的分异指数,都说明存在良好的成矿物源条件,在后期构造活动、热力运动作用下,矿液运移过程中在物理场、化学场突变时沉淀成矿。文中收集了本区132/43、132/42、MSS和TM磁带数据,对物探、化探、地质、遥感等资料进行计算机多数据综合图象处理,应用于成矿预测。The basement of Tengchong—Lianghe tin metallogenic region is Protero-zoic-Palaeozoic, and the cover is the Menghong Group of Upper Palaeozoic. During Mesozoic-Cenozoic periods, this region, to be an obduction wall in the Mizhina-Mandele and Najiashan—Alagan subduction zones, was activated strongly in faulting with intruded magma repeatedly so as to be favourable to mineralization. Siliceous mylonite and migmatite occurred in the Menghong Group and felsic mylonite occurred in the granite represent different environ-ment of temperature—pressure and different levels of deformational condi-tions. The ore deposits occur in brittle environment at shallower part. Accor-ding to the data analysis of metallogenic temperature, inclusion composition and saltiness, the three ore sections at higher elevation in the Lalieshan ore field, the Taojinchu, Sangedong and Laoxiongwo sections, are not the same evolutionary series as the Siguangping section at lower elevotion. Ore source material of the Siguangping ore section originated from another rock mass with its ore bodies occur in echelon patterns. Therefore, there is of metallogenic possibility at depth and in the adjacent areas. The Xiaolonghe tin deposit is closely related to the granite. The Guyong composite batholith was intruded re-peatedly. The differentiation index of tin is very high. These show that there is a good condition of metallogenic sources. Under later tectonic action and thermal motion, mineralizing solution was precipitated into deposit when phy-sical and chemical fields changed suddenly in its transporting process. This paper covers the 132/43, 132/42, MSS-and TM-tape data. The results of managing the data of geophysical and geochemical prospecting, geology and remote sensing by computer-multiple data and synthetic image are app-lied to metallogenic prognosis.

关 键 词：锡矿 成矿 控矿构造 矿床 预测 

分 类 号：P618.440.5[天文地球—矿床学]