低磁纬度地区ΔT异常解释的途径与方法  

APPROACHES TO THE INTERPRETATION OF MAGNETIC ΔTANOMALIES IN THE LOW MAGNETIC LATITUDE AREA

作　　者：方迎尧[1] 张培琴[1] 刘浩军[1] 

机构地区：[1]中国国土资源航空物探遥感中心,北京100083

出　　处：《物探与化探》2006年第1期48-54,共7页Geophysical and Geochemical Exploration

摘　　要：我国海南省诸岛礁及广阔的南海海域,位于磁赤道带两侧的低磁纬度区内,在以水平磁化为主的环境中,磁性物体所产生的ΔT异常特征与处于中纬度地区的中国大陆广大地区的ΔT异常特征差别较大,长期以来,对其认识与解释都感到困惑。通过对实测资料的应用与研究,分析了不同磁化条件下,ΔT、Za、Ha异常的关系,提出了低磁纬度地区ΔT异常的解释思路、“倒相180°解释方法”,改进了低磁纬度地区化赤、化极等磁化方向转换的稳定性和变倾角转换问题,论述了ΔT总导数模量定性与定量解释方法等。认为不仅可解决低磁纬度地区的磁异常解释问题,而且在对全球磁异常的认识与解释时也有重要作用。Situated in a low magnetic latitude area around the magnetic equator, the island of Hainan Province and the extensive South China Sea are in a horizontally magnetized environment. The characteristics of △Tanomalies caused by magnetic bodies in the area differ greatly from those in the middle magnetic latitude area of China's Mainland, which has long baffled the understanding and interpretation of the anomalies. Through the application and study of the measured data, the authors analyzed in this paper the relations between Za, Ha and △T anomalies in different magnetized conditions, put forward interpretation train of thought and a ＂phase reversal 180°＂ interpretation method for △Tanomalies in the low magnetic latitude area, improved the stability of magnetization direction transformation （reduction to the equator or the pole, etc. ） and the inclination-variant transformation method, and also discussed the qualitative and quantitative interpretation of the total derivative norm of △T anomalies. It is considered that these approaches can solve the interpretation problem of the magnetic anomalies in a low magnetic area, and also help to understand and interpret the global magnetic anomalies.

关 键 词：低磁纬度区 △T磁异常特征 磁化方向转换 异常解释方法 

分 类 号：P631.2[天文地球—地质矿产勘探]