西太平洋MF海山磁异常特征及其地质解释

The Magnetism Anomaly and Its Geological Significance of Mf Seamount in West Pacific

西太平洋由于大规模火山活动存在,深层熔岩上涌,为结壳的形成提供了丰富的物质来源。根据磁测资料,对区内MF海山磁异常特征,采用似二度体磁力剖面异常特征计算公式,用正演拟合方法来反演地下地质体产状、形态大小、基底起伏和磁性体物性参数,从而得出磁源体特征。研究海山性质及邻域洋底的地质构造特征,特别是断裂构造及其分布、岩浆活动规律以及岩石物性等有关的海山结壳的地质构造背景及其演化,为探讨地质构造对结壳的生长的控制作用提供依据,并为评价富钴结壳资源提供基础资料。

There largely developed volcano erupting and effusing of the lava from the deep stra- tum in West Pacific, which provided plentiful sources for the crusts coming into being. Based on the magnetic anomaly of the MF in the study area, we adopted the magnetic anomaly formu- la in similar two-dimension and then inversively simulated the occurrence, dimension of the geo- logical body, The configuration of its basement and its physical parameter etc. by the forward modeling method. The characteristic of the magnetism sources was drawn. The research on the geological structure of quality of the seamount and adjoining seafloor, especially on its geological background and the evolution such as the distribution of the stuctrual fault, the rule of the mag- ma activity and rock property etc, which is related to the formation of the crusts, provided groundwork not only for the understanding of geological structure effecting on the srusts forma- tion, but also for the assessment of the Co-rich crusts scull resources.