鲁中碳酸岩成岩分析及其含矿性

鲁中隆起北缘分布有100多个燕山期的碳酸岩体.它们的分布受淄河断裂及禹王山断裂派生的次级断裂控制。主要有碳酸云母岩、云母碳酸岩及碳酸角砾岩三类碳酸岩,多呈岩床产出,另有两个角砾岩筒。根据产状、结构、构造、化学成分及矿物中包裹体等特征,认为是与金伯利岩有成因联系的岩浆产物。推测其深部可能存在一个较大的碳酸岩体,可能出现以稀有元素Nb为主的矿化。

ROCK-FORMING ANALYSIS OF CARBONATITES AND THEIR METALLOGENIC PROGNOSIS IN CENTRAL SHANDONG

On the northern border of rise of Central Shandong distribute Cretaceous carbonatite bodies.Their distribution was controlled. by Zihe and Yuwangshan fractures which were the secondary fractures of Yishu rift system.There are three kinds of carbonatites: carbonate biotite rocks, biotite carbonatites and carbonatite-breccias. Carbonatites occur chiefly in the form of sills and minor dikes.There are two breccia pipes. Based on their geological occurrence, typical texture and structure, chemical composition, REE and features of fluid inclusions, we suggest that carbonatites are magmatic products, According to the degree of exposure of carbonatite body and metallogenic model of A. pooBa, in the deeper situation of crust probably exists a larger carbonatite body and rare metal mineralization.