陕西秦巴地区金属矿床密集区的岩石圈结构及深部成矿作用

STRUCTURES OF THE LITHOSPHERE AND THE DEEP-SEATED MINERALIATION IN THE CONCENTRATION PLACES OF METALLIC ORE DEPOSITS IN THE QINLING-DABASHAN AREAS IN SHAANXI PROVINCE

根据陕西中小比例尺航磁、重力、地震波速资料 ,结合秦巴地区大地构造单元金属矿床密集区分布特点 ,从地球物理场研究角度 ,分析探讨矿床密集区岩石圈结构特征和深部流体、深部构造的成矿作用。通过研究 ,表明陕西秦巴地区的金属矿床密集区主要分布在地幔隆起带的坳陷区、幔隆与幔坳接触部位、前寒武纪基底抬升区 ,其次是加里东—印支期深大断裂带附近。经对比分析 。

Based on the results of aerial magnetization survey, gravity survey and wave speed information at a medium small scale in Shaanxi Province, and the distributed features of the concentrations of metallic ore deposits in tectonic units in the Qinling Dabashan area, researches on geophysical fields have revealed the characteristics of the lithosphere structures, deep seated fluid and mineralization, downward structures in the places where metallic ore deposits are concentrated in Shaanxi Province. Studies have made the following conclusions that the concentration places of mineral deposits in Qinling Dabashan area in Shaanxi are mainly distributed in the depressed places of the mantle uplift zones and the contact portion between the mantle and the mantle col and the basement uplift places of pre Cambrian period, secondly near the deep seated big faults of the Caledonides Indosinides. So, polymetal deposits dominant in copper, molybdenum and silver are mainly distributed in the north Dabashan area of Shaanxi Province.