青海省阿尔金地区石墨矿地质特征及找矿方向

Geological Characteristics and Prospecting Direction of Graphite Deposit in Aerjin Area Qinghai Province

通过对青海省阿尔金地区石墨矿成矿地质背景、成矿地球物理特征、矿床地质特征、成矿规律、矿床成因的研究,认为该区石墨矿大多产于大地构造隆起带和断裂构造岩浆岩带中,矿床点受区域阿尔金北东向深大断裂带控制,矿体一般多沿区域主构造线方向呈北东或北西向产出;赋矿地层为古元古代达肯大坂岩群大理岩,主要成因受古元古代原始沉积以及早古生代碰撞造山作用有关的区域变质作用控制,后期遭受了构造-岩浆叠加作用;找矿标志为古元古代达金水口岩群变质大理岩、石墨矿化及围岩蚀变、自电负异常和激电"低阻高极化"异常;找矿方向为3个远景区6个找矿靶区。

Through the study of the geological background, metallogenic geophysical characteristics, geological characteristics of the deposit, metallogenic rules and genesis of the graphite deposit in the Aerjin area of Qinghai province, it is believed that most of the graphite deposits occur in the tectonic uplift belt and the fault magmatic belt, the ore deposits are controlled by the deep and large fault belt in the northeast direction of Aerjin region, and the ore bodies are generally produced in the northeast or northwest direction along the main tectonic line. The ore-bearing strata are paleoproterozoic Dakendaban group marble, which is mainly controlled by paleoproterozoic original deposition and regional metamorphism related to early Paleozoic collision orogeny, and suffered from tectono-magmatic superposition in the later period;The prospecting criteria are metamorphic marble, graphite mineralization and wall rock alteration, self-electronegative anomaly and IP "low resistance and high polarization" anomaly;The ore-prospecting direction is 3 prospective areas and 6 ore-prospecting target areas.