Geological Characteristics and Prospective Value of Greenstone Type Gold Deposits of Central Part of Inner Mongolia Autonomous Area
ZHENG Fanshen, XU Guoquan, FENG Zhen, ZHANG Zhenfa, CAI Hongjun Geological Department of Inner Mongolia Bureau of Geology and Mineral Exloitation, Huhhot, 010020
Two types of greenstone belts occurring within Archeozoic and Proterozoic respectively have been identified in the Daqingshan—Wulashan district, which belongs to central part of Inner Mongolia autonomous area. The average Au contents of Archeozoic and Proterozoic greenstone are 2.8×10 -9~32×10 -9, 2.6×10 -9~34×10 -9 respectively. Compared with the other types of rocks, the greenstone is characterized with high Au content, and always occur the large or middle scale gold deposits. The gold deposits of the study area may be classified as five types: (1) stratoid veinlet-disseminated type, such as the Motianling gold deposit; (2) sedi-metamorphic rocks stratabound type, such as the Maoduqing and Youlougou gold deposits; (3) K-feldspar-quartz vein type, such as the Wulashan gold deposit; (4) altered rock-quartz vein composite type, such as the Donghuofang gold deposit; (5) quartz vein type, such as the Houshihua gold deposit. The former two types belong to the Proterozoic greenstone type gold deposit, and the latter three types belong to the Archeozoic greenstone type gold deposit. According to the Xie Xuejin's theory of geochemical prospecting and the geological features of the study area, six geochemical block had been choosed as ore-finding prospective area: (1) the Xihezi—Xindigou—Hongpan Au geochemical block; (2) the Yinhao—Erdaowa—Shanggaotai Au geochemical block; (3) the Amawusu—Xishanwan—Bainaimiao Au-Cu geochemical block; (4) the Heiaobao—Saiwusu—Chagancilao Au geochemical block; (5) the Jinpen—Mamitu—Manzhouli Au-Cu geochemical block; (6) the Wulashan—Yushuwan Au geochemical block. It is estimated that the Au productivity reach to 67550t within the six geochemical blocks, which indicates that there is good metallogenetic material foundation and ore-finding prospective potential in the study area.
【CateGory Index】： P618.51