甘肃肃北白石头沟矿区地质特征及找矿标志浅析

Geological characteristics and prospecting criteria of the Bai Shi Gou Gou mining area in Subei, Gansu

白石头沟矿区地处祁连造山带与敦煌地块的交接部位,是敦煌地块南缘重要的矿床,矿体主要赋存于太古宙—古元古代敦煌岩群B岩组含石墨大理岩、含石墨石英片岩中,原岩为一套浅海相碎屑岩夹碳酸盐岩含碳沉积建造,矿石类型有石英片岩型和大理岩型两类,其中大理岩型矿石品位高,空间展布、形态受褶皱构造控制,局部呈"S"形;石英片岩型矿体呈似层状、层状产出,矿层厚大且稳定,矿体产状与围岩产状一致,属沉积变质型矿床。通过区域地质背景、矿床地质特征研究,浅析矿床成因及找矿标志,为该区进一步寻找类似矿床提供借鉴。

Baishigou mining area is located at the junction of the Qilian orogenic belt and the Dunhuang block, and is an important deposit in the southern margin of the Dunhuang block. The ore bodies are mainly hosted in the graphite-bearing marble and graphite-bearing quartz schist of the Archean-Paleoproterozoic Dunhuang Group B rock group. The primary rock is a set of shallow-sea clastic rocks intercalated with carbonate rocks. The ore types are quartz-schist type and marble type, of which marble type ore is of high grade, space distribution and shape controlled by fold structure, and locally in the shape of ＂S＂; quartz-schist type ore bodies are stratoid and stratiform, with thick and stable ore beds, and the occurrence of ore bodies is consistent with that of surrounding rocks, belonging to sedimentary metamorphic type ore deposits.. Based on the study of regional geological background and geological characteristics of the deposit, the genesis and prospecting criteria of the deposit are analyzed, which can provide reference for further exploration of similar deposits in this area.