矿床地质2011，Vol.30Issue(5)：837-854,18.
内蒙古拜仁达坝-维拉斯托银多金属矿床的矿相学特征
Mineragraphy of Bairendaba and Weilasituo silver-polymetallic deposits in Inner Mongolia
摘要
Abstract
Bairendaba and Weilasituo are two silver-polymetallic deposits discovered in recent years in eastern Inner Mongolia. Mineragraphic studies by using the SEMEDX revealed the modes of occurrence of the silver-bearing minerals such as allargentium, dyscrasite, argentobismutite, freibergite and native silver. Metallic minerals in these two deposits are summarized systematically, including their modes of occurrence and formation sequences. The commonly existent jelly-like pyrite is regarded as the product of the earliest ore-forming stage, suggesting a hot water sedimentary environment at low temperature. During the later meso-hypothermal ore-forming pro-cess, the assemblage of pyrite + sphalerite + galena + pyrrhotite + chalcopyrite + arsenopyrite + cassiterite was formed. Subsequently, these minerals were crushed and mylonitized intensely, and the ores were characterized by plastic deformation-brecciated and mylonitic structure. After this structural deformation, another meso-hypothermal ore-forming process took place, forming the S-rich metallic mineralization and Bi + Ag sulfides of pyrite → native bismuth + argentobismutite → galena + pyrrhotite + sphalerite + chalcopyrite. During the subsequent meso-epithermal ore-forming process, a series of S-poor, Sb- and Ag-rich sulfides were formed, such as pyrrhotite + galena + sphalerite → robinsonite + freibergite → allargentium + dyscrasite → native silver. In general, three periods (composed of 4 stages) of mineralization occurred in the ore deposits, whereas Pb and Zn mineralizations were related to the second and third periods, and the silver mineralization was probably related to the late stage of the third period.关键词
地质学/矿相学/银多金属矿床/拜仁达坝/维拉斯托/内蒙古Key words
geology/mineragraphy/silver polymetallic deposit/Bairendaba/Weilasituo/Inner Mongolia分类
天文与地球科学引用本文复制引用
刘妍,江思宏,张志刚,刘翼飞,聂凤军..内蒙古拜仁达坝-维拉斯托银多金属矿床的矿相学特征[J].矿床地质,2011,30(5):837-854,18.基金项目
本文得到国家重点自然科学基金项目(编号:41030421) （编号:41030421）
中央级公益性科研院所基本科研业务费专项资金(编号:K0704) （编号:K0704）
全国危机矿山项目(编号:20089948)和地质大调查项目(编号:1212010911029)联合资助 （编号:20089948）
