陕南地区前寒武纪基底与金铜铅锌矿床分布关系

依据陕南秦岭造山带区域地质及重力资料，按是否露出地表将前寒武纪基底划分为出露基底和隐伏基底两种类型。其中，圈定出露基底15处，解译推断隐伏基底6处。小秦岭—北秦岭地区的基底大多露出地表，其总体具典型华北地块基底特征；南秦岭、勉略阳及北大巴山地区的出露基底则呈较零散的孤岛状分布，而隐伏基底向南、北两侧扩展延伸范围较大且基本连为一体，基底性质总体具典型扬子地块双层基底特征。区内已知大—中型金、铜、铅锌矿床(田)及Au、Ag、Cu、Pb、Zn元素化探异常密集区(带)的分布大多与前寒武纪基底有关。前寒武纪基底与上述矿产和化探异常间的分布关系，无疑为今后本区贵金属及有色金属矿产勘查评价及成矿预测提供了新的思路。

RELATIONSHIP BETWEEN THE PRECAMBRIAN BASEMENT AND MINERALIZATION IN SOUTHERN SHAANXI

Based on the regional tectonics and gravity data in the Qinling orogenic zones in Southern Shaanxi, 15 outcrops of the Precambrian basement have been divided and 6 burried basements inferred through interpretation. It is common that the basement in Xiaoqinling and North Qinling areas appears on the surface, the characteristics of which are the same with the North China massif. The basement outcrops in South Qinling, Mianxian Lueyang Yangxian and north Dabashan areas are distributed in some sporadic and island arc. The buried basement extends at a large extent toward the both sides of south and north, and generally links together. The property of the basement is of characteristics of the typical double layered basement of the Yangtze massif. The distributions of known large and medium sized gold, copper, lead zinc deposits (occurrences) and geochemical anomalies of Au, Ag, Cu, Pb and Zn are often directly or indirectly controlled by the Precambrian basement.