STUDY ON FLUID INCLUSIONS OF THE XISHANWANYANGCHANG SILVER POLYMETALLIC DEPOSIT, INNER MONGOLIA

摘要

The Zha’ertaishan Area, lied in midwest area of Inner Mongolia, is located in the east section of Langshan-Zha'ertaishan mesoproterozoic rift zone of the northern margin of the north china plate. Exposed strata in it are mainly composed of the late Archean, middle Proterozoic, Mesozoic and Cenozoic. Intrusive rocks are mainly metamorphosed Mesoproterozoic intrusive rocks, intrusive rocks of Cambrian, Ordovician intrusive rocks, intrusive rocks of Permian and Triassic intrusive rocks. The direction of max primary stress is near east-west for structure, and a NEE compression in the west part of studied area, a NWW compression in the east part, and it is an arcshaped and projects in the N direction trend to near east-west in the middle. Lower Cretaceous volcanic rocks outcrop larger, and they are principally distributed from Nanwangrudi to Xishanwanyangchang spreading out in near SN, and Volcanic fissure eruption was on the whole. The rocks are made of mafic volcanic rocks of Jinjiayaozi formation and acidic volcanic roks of Bainuyangpan formation, showing of mafic - acidic evolution from south to north, which appeared as copper polymetallic - zeolite, bentonite, perlite - silver (fluorite) - gold (silver) metallogenic series from south to north, as a mineralization zonation in vertical distribution along volcanic belt.