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甘肃红石山铬铁矿的矿床特征,对研究地槽区单斜状超基性岩体铬铁矿成矿作用的特点和成因,有一定的意义。在综合究研以往资料的基础上,本文对该铬铁矿床形成的某些规律及成因问题进行初步探讨。 (一)区域和超基性岩体地质概况本区位于北天山华力西褶皱带的东延部分,区域地层及构造线呈近东西走向。矿区北侧为一东西向的区域性挤压大断裂。大断裂以北是一复背斜构造,主要由奥陶纪及中晚古生代地层组成,以海相火山岩和硅质页岩建造为主;大断裂以南,则以早石炭世巨厚的酸性、中酸性火山岩为主组成复向斜构造。含铬超基性岩体赋存于复向斜北翼由中酸性火山岩、云
The characteristics of the ore deposits of Hongshishan chromite in Gansu province are of great significance for studying the characteristics and genesis of chromite mineralization in the monoclinic ultramafic rocks in the terrain area. Based on the comprehensive study of previous data, this paper discusses some of the rules and causes of formation of the chromite deposit. (I) Geological overview of regional and ultrabasic rock mass The area is located in the eastern extension of the Wahli Xikou belt in the northern Tianshan Mountains. The regional stratigraphy and tectonic line are near east-west. The north side of the mining area is an east-west regional large-scale extrusion. To the north of the major fault is a complex anticlinal structure mainly composed of Ordovician and Mesozoic and Paleozoic strata, mainly composed of marine volcanic rocks and siliceous shale; south of the major faults, , Acidic volcanic rocks mainly composed of synclinal structures. Chromium-bearing ultramafic rocks occur in the synclinal north wing formed by intermediate-acid volcanic rocks and clouds