山东左家金矿地质特征及找矿探讨

Geological Characteristics and Prospecting of Zuojia Gold Deposit,Shandong Province

该区地处招(远)平(度)断裂和牟平--即墨断裂(桃村断裂)之间。历经多次构造运动,地质构造复杂,岩浆活动频繁。境内的沉积建造、岩浆活动、构造变动、变质作用等,对各类矿产的形成提供了有利条件。区内广泛分布以中--基性喷发为主的火山沉积建造、胶东岩群、同期侵入的TTG质片麻岩为玄武质岩浆分异产物与之后形成的古元古代荆山群、粉子山群地层一起构成区内初始矿源层,是区域的基底控矿条件。该金矿位于栖霞~蓬莱金成矿带中段,矿体受NE向断裂严格控制,产出特点呈脉状、透镜状产出。矿床成因类型为岩浆期后热液型金矿床。该文对左家金矿地质特征及找矿前景展开分析,旨在为进一步深部勘查提供地质依据。

The area is situated between Zhaoyuan Pingdu fault and Mouping-Jimo fault. After many tectonic movements, the geological structure is complex and the magmatic activity is frequent. Sedimentary formation, magmatic activity, tectonic alteration and metamorphism within the territory provide favorable conditions for the formation of various minerals. Volcanic sedimentary formation dominated by intermediate-basic eruption, Jiaodong Group, TTG gneiss intruded in the same period are basaltic magmatic differentiation products, which together with the subsequent strata of Paleoproterozoic Jingshan Group and Fanzishan Group constitute the initial source bed in the area, which is the basement ore-controlling condition of the region. The gold deposit is located in the middle of Qixia-Penglai gold metallogenic belt. The orebody is strictly controlled by NE-trending faults, and its occurrence characteristics are vein-like and lenticular. The genetic type of the deposit is postmagmatic hydrothermal gold deposit. This paper analyses the geological characteristics and prospecting prospects of Zuojia gold deposit in order to provide geological basis for further deep exploration.