粤西信宜——罗定地区锡矿床成矿规律研究  

A Study on Metallogeny of Tin Deposits in Xinyi-Luoding Area,Western Guangdong Province

作　　者：俞受鋆[1] 陈志中[1] 陈炳辉 

机构地区：[1]中山大学地质学系

出　　处：《中山大学学报（自然科学版）》1990年第3期183-191,共9页Acta Scientiarum Naturalium Universitatis Sunyatseni

摘　　要：信宜—罗定地区各种类型锡矿床,主要沿着震旦系云开群b组地层分布,与区内燕山晚期复式花岗岩类关系密切。斑岩锡矿主要产于花岗斑岩岩筒内部及其接触带,蚀变与矿化具分带现象;云英岩型锡矿主要产于花岗岩体顶部隆起部位面型云英岩化带中;层控矽卡岩型锡铁矿产于燕山晚期花岗岩体外接触带震旦系云开群b组中段矽卡岩中,矿体呈似层状、透镜状产出,与地层产状基本一致;脉型锡矿主要呈脉状产于燕山晚期花岗斑岩或花岗岩的外接触带变质地层中。各种类型锡矿床均不同程度地受到云开群b组中段地层、燕山晚期花岗岩类及鹦鹉岭—锡坪北西向构造带所控制,而具体岩体侵位及矿体产出,则主要受北西向与北东向或近东西向复合构造所控制。本文在研究各类锡矿床主要特点及其控矿条件的基础上,总结了本区锡矿床的成矿模式。Tin deposits in Xinyi-Luoding area,western Guangdong province distributed in formation b of Yunkai Group of Sinian System(Z_(yk)~b)and are closely related to Late-Yenshanian multi-stage granitoids.Of the various types of deposit,the porphyry type occurs within first stage granite-porphyry and at its contact zone where alteration and mineralization zoning is apparent;the greisen type is closely related to the second stage granites,occurring in planar greisenization zone in the upheaval area at the top of the granitic bodies;the strata-bound skarn type (?)n- Fe deposits occur in the exo-contact zone of the Late-Yenshanian granitic bodies and the lentoid or stratoid orebodies are distributed along the middle rock series of Z_(Yk)~b;and the vein type tin deposits are chiefly located in the metamorphosed country rocks at the exo-contact zone of the Late-Yenshanian granitoids.All of the tin deposits are controlled,to different degrees,by the middle rock series of Z_(yk)~b,the Late-Yenshanian granitoids and the Yinwulin-Xiping northwestern-tren- ding fault zone.The granitic bodies and orebodies in certain ore district are con- trolled by composite structure of NW and NE or EW trending faults.Based on their characteristics and ore-controlling conditions,a metallogenic model of tin deposits is synthesized in the article.

关 键 词：锡矿 成矿规律 成矿模式 粤西 

分 类 号：P618.440.1[天文地球—矿床学]