摘要
内蒙古中部大青山—乌拉山地区发育有太古宙和元古宙两个时代和类型的绿岩带,太古宙绿岩中Au平均含量为2 .8×10 - 9～32×10 - 9,元古宙绿岩中Au平均含量为2 .6×10 - 9～34×10 - 9,与其他岩类相比,绿岩含矿性高,常赋存有大、中型金矿床。大青山—乌拉山地区金矿可划分为5种类型:1似层状细脉浸染型,如摩天岭金矿;2沉积变质层控型,如卯独庆和油篓沟金矿;3钾长蚀变-石英脉型,如乌拉山金矿;4蚀变岩-石英脉复合型,如东伙房金矿;5石英脉型,如后石花金矿。前两种属于元古宙绿岩型金矿,后三种属于太古宙绿岩型金矿,目前,该区已发现70余处金矿床(点)。根据谢学锦的地球化学找矿理论和本区地质特征,区内选出6个地球化学块体作为找矿远景区,它们是:1西河子—新地沟—红盘;2银号—二道洼—上高台;3阿玛乌素—西山湾—白乃庙;4黑敖包—赛乌素—查干此老;5金盆—麻迷图—满洲窑;6乌拉山—榆树湾。预测6个地球化学块体金金属量6 75 5 0 t,表明本区具有良好的成矿的物质基础和找矿远景。
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.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2005年第2期232-248,共17页
Acta Geologica Sinica
关键词
内蒙古
绿岩型金矿
地质特征
成矿远景
赋矿地层
控矿构造
greenstone zone
gold deposit
finding ore area
Wulashan Group
Erdaowa Group
target region
