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北祁连中西段超基性岩体较为发育,在东西长六百余公里,南北宽八十公里的范围内已知岩体746个,其中具铬矿化的岩体65个。所有这些岩体,在空间上均受不同形式断裂带的控制,因而在其分布上呈现成带成群的出露特征。据初步划分,北西向的超基性岩带计有托莱山岩带、走廊南山南坡岩带、走廊南山北坡岩带;东西向的岩带计有马蔬河岩带和向郎山一冷龙岭岩带。岩体成岩时期主要为加里东中一晚期,少数为华力西期。
The ultrabasic rock mass in the central and western parts of North Qilian is well developed. There are 746 rock masses known to exist within 600 kilometers of east-west length and 80 kilometers of north-south width, of which 65 are chrome-mineralized. All of these rock masses are spatially controlled by different types of fault zones and thus appear as band-forming detritus in their distribution. According to the preliminary division, the NW-trending ultrabasic rock zone includes the Tuolaishan rock belt, the southern slope of the southern slope of the corridor, the northern slope of the Nanshan corridor and the northern slope of the Nanshan corridor. The east- Leng Longling rock belt. The diagenetic period of the rock mass is mainly the late Caledonian one, and the minority is the Variscan period.