“三江”北段二叠-三叠系沉积建造特征及铅锌矿的初步富集  

Characteristics of sedimentary formations and the preliminary enrichment model of Pb-Zn deposits in the north part of Sanjiang,China

作　　者：陈建平[1] 丛源[1] 董庆吉[2] 

机构地区：[1]中国地质大学国土资源与高新技术研究中心,北京市国土资源信息开发研究重点实验室,地质过程与矿产资源国家重点实验室,北京100083 [2]中国地质科学院矿产资源研究所,北京100037

出　　处：《成都理工大学学报（自然科学版）》2010年第4期469-474,共6页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家“十一五”科技支撑课题(006BAB01A08);中国地质调查局资助项目(1212010630804)

摘　　要：探讨"三江"北段铅锌矿床成矿物质的预富集作用。通过对典型矿床的矿石特征、下-中二叠统尕笛考组和上三叠统波里拉组的沉积环境特征研究,认为中二叠世-晚二叠世,研究区的构造环境为弧后盆地环境,形成初始矿源层;早中三叠世-晚三叠世,为火山岛弧环境,是层控预富集成矿期。该地区在二叠-三叠纪期间,盆地中发生的热水喷流沉积作用使铅锌成矿物质得到了初步的富集。In recent years, many huge potential Pb-Zn deposits have been discovered in the north part of the Sanjiang metallogenic belt, and the Dongmozhazhua Pb-Zn deposit is one of the representative ore deposits. This paper discusses the primarily enriched mineralization materials which are very important to the formation of Pb-Zn mineral deposits in study area. Based on the ore characteristics of the representative ore deposits and the study of the sedimentary environments of Upper Triassic Bolila Formation and Lower-Middle Permian Gadikao Formation, the paper indicates that the structure setting of study area is a back-arc basin from Middle Permian Period to Late Permian Period, and has formed the source bed of mineralization. The structure setting of study area is volcanic arc setting from Early-Middle Triassic Period to Late Triassic Period, and the mineralization is a stratabound pre- concentration type. The exhalative hydrothermal sedimentary mineralization of this basin have caused the mineralization materials such as Pb and Zn etc. primarily enriched from Triassic Period to Permian Period in study area.

关 键 词：热水沉积 预富集 波里拉组 尕笛考组 “三江” 

分 类 号：P618.4[天文地球—矿床学]