地面高精度磁法在陕南西乡地区磁铁矿勘查中的应用

摘要

Geophysical and geochemical exploration in Taishanmiao area of Xixiang district within southern Shaanxi is characterized by low work extent, single exploration method and very insufficient anomaly information. In order to investigate the distribution, extension⁃al boundary and deep variation of the magnetite deposit in the basic rock mass, the author adopted ground high-precision magnetic method and utilized such methods as upward continuation and 2. 5D human⁃computer interactive inversion in conjunction with 1 ∶ 25 000 stream sediment survey results and geological characteristics to make interpretation and deduction of anomalies. Through careful processing of data obtained from ground high-precision magnetic survey, the author delineated the range of magnetic anomaly, deter⁃mined the distribution and spatial characteristics of magnetite deposit in the basic rock mass, thus providing the verifiable target for fur⁃ther deployment of geological exploration work.%陕南西乡太山庙地区以往物化探工作程度低，方法单一，异常信息量少。为了探明基性岩体中磁铁矿的展布、延伸边界及深部变化情况，利用地面高精度磁法，使用向上延拓、2．5D人机交互反演等方法，结合1∶2．5万水系沉积物地球化学测量成果和初步的地质特征，对异常作出解释推断和综合评价。通过对地面高精度磁法资料的精细处理，圈定了磁异常范围，确定了基性岩体中磁铁矿的分布范围和空间特征，为地质勘查工程部署提供了可验证靶区。