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TZB铬铁矿矿床,是一个主矿体赋存在超基性岩体围岩中的矿床.本文着重介绍其基本地质特征,以供交流.一、地质概况本矿床位于北祁连山加里东褶皱带,走廊南山复向斜南翼.区内出露地层主要为下奥陶统的中-基性火山质沉积岩(O_1~a),浅变质火山沉积岩(O_1~(b-1))和灰绿色变砂岩与千枚岩互层(O_1~(b-2)).在前两岩组中夹有大量的碳酸盐岩透镜体.这套地层呈北西走向,为倾向北东的单斜层.此外,在矿区南部还出露有中、古生界地层,它们同奥陶系地层呈断层接触(图1).
The TZB chromite deposit is a host ore deposit hosted by the ultramafic rocks in the surrounding rock.In this paper, the basic geological characteristics of the TZB ore deposit are described for the purpose of exchange I. Geological background The deposit is located in the Caledonian fold belt in the North Qilian Mountains, Corridor Nanshan anticline south wing.The exposed strata in this area are mainly the Lower-Middle Ordovician medium-basic volcanic sedimentary rocks (O_1-a), the shallow metamorphic volcanic sedimentary rocks (O_1-b-1) and the gray-green color change Sandstone and phyllite interbedded (O_1 ~ (b-2)). There are a large number of carbonate lenses sandwiched in the first two groups of rocks, which are NW-trending and monoclinic with easterly easterlies. In addition, there are also Mesozoic and Paleozoic strata exposed in the southern part of the mine, which are in fault contact with Ordovician strata (Figure 1).