山东蒙阴西峪矿区深部与外围金刚石矿床地质特征及成因

Geological characteristics and genesis of diamond deposits at the depth and periphery of the Xiyu mining area in Mengyin, Shandong Province

山东蒙阴西峪金刚石原生矿床位于华北克拉通东缘。结合区域地质背景、矿床和矿(化)体地质特征,对该矿床的成矿地质条件、控矿因素和矿床成因进行研究。断裂是该矿床的主要控矿因素,矿床的形成及分布与区域NNE向沂沭断裂带、上五井断裂和NWW向新泰—垛庄断裂、铜治店—蔡庄断裂有关,金刚石矿大多产于这些断裂的交接复合部位,是金伯利岩浆的运移通道和储存空间。金刚石是加里东期金伯利岩浆作用的产物。

The Xiyu primary diamond deposit at Mengyin County, Shandong Province, is located in the northeastern margin of North China Craton.Combined with regional geological background, geological characteristics of the ore deposit and mineralization, this paper aimed at understanding metallogenic geological conditions, ore- controlling factors and ore genesis of this deposit.The study shows that faults are the major ore controlling factors and formation and distribution of the deposit is related to the faults within this region, including the NNE-trending Yishu fault zone, Shangwujing fault, NW-trending Xintai-Duozhuang fault and Tongzhidian-Caizhuang fault.Most of the diamond deposits occur in the intersections of these faults, which serve as transport channels and storage spaces for kimberlite magmas.Diamonds were the product of the kimberlite magmatism in Caledonian.