东乡地区有色、贵金属矿(点)重磁场特征及找矿探讨

东乡地区处赣东北断裂、信江隐伏深断裂相交部位及两侧,地跨两个地体,区内的有色、贵金属矿床大都受断裂作用的控制,与之成矿关系密切的岩体是赛阳关闪长玢岩体.由于断裂带中及两侧分布的不同地层或岩体存在密度差异,导致其上方出现重力梯度带,而重力梯度带及其变异带上分布众多的航磁局部异常,这些局部磁异常是目前全区已知有色、贵金属矿的主要分布地带.结合地质化探资料,掌握重(磁)异常的分布情况时开展矿产勘查及找矿评价有着重要的意义.

GRAVITATIONAL AND MAGNETIC FIELDS OF NONFERROUS AND NOBLE METAL DEPOSITS(SPOTS)AND ORE EXPLORATION IN THE DONGXIANG AREA

Dongxiang area is located at intersection resion of northeast Jiangxi fault and Xinjiang hidden deep fault, and spans two terrenes. In the area, nonferrous and noble metal deposits are mostly controlled by faults, and Saiyanguan diorite - porphyry is related with mineralization. There are differences of density between strata or rocks in and beside fault belts, and gravity gradient belts appear upon these areas. Great deals of aeromagnetic local anomalies are located over these gravity gradient belts and their variation, where a majority of known nonferrous and noble metal mines in whole area are distributed. Combining geological and geochemical information, mastery of distribution of gravitational and magnetic anomalies has an important significance in ore exploration and evaluation.