南极布兰斯菲尔德盆地重力异常研究

RESEARCH ON GRAVITY ANOMALY IN BRANSFIELD BASIN,WEST ANTARCTICA

１９９１年，“海洋四号”科学考察船在南极布兰斯菲尔德海峡采集了大量的地球物理资料。本文在利用地震调查资料的基础上，根据现有的重力测量数据，研究引起重力异常的各种地质因素，对实测剖面重力异常进行正演拟合，建立了布兰斯菲尔德盆地的密度模型，并推导出该地区莫霍面深度－布格异常关系表达式，绘制出盆地的莫霍面深度图。

A great of physical data was colleted by the vessel 'Ocean IV' from China in the Bransfield Strait in 1991. The analysis and research on the Bransfield Strait are mainly based on the gravity measurment data,while seismic measurement data is utilized fully.The series of geological factors,which lead to gravity anomaly,can be subdivied into three parts:shallow,middle and deep.A density model in the Bransfield Basin is created while gravity anomaly of a profile has been calculated,and Moho depth map of the Bransfield Basin is made after relation formula of Moho depth and Bouguer gravity anomaly has been reckoned.