CAJ | 학술논문

利用南海最新的磁力资料,在岩石物性分析基础上,选择南海一条典型剖面拟合反演其密度与磁性结构并以拟合结果作为约束,反演全海域磁性基底的宏观分布.对南海磁力数据进行了低纬度化极处理,利用Halo小波基对化极磁异常进行了多尺度分析并依据磁力异常特征进行了磁场分区.根据剖面与全海域磁性基底反演结果认为:南海北部陆缘更倾向于非火山型的构造属性.磁性基底对浅部沉积作用的控制关系在莺歌海一带表现得非常明显.中一西沙和南沙块体的磁性基底特征十分相似,推测在海盆拉张之前,二者为同一块体.
이용남해최신적자력자료,재암석물성분석기출상,선택남해일조전형부면의합반연기밀도여자성결구병이의합결과작위약속,반연전해역자성기저적굉관분포.대남해자력수거진행료저위도화겁처리,이용Halo소파기대화겁자이상진행료다척도분석병의거자력이상특정진행료자장분구.근거부면여전해역자성기저반연결과인위:남해북부륙연경경향우비화산형적구조속성.자성기저대천부침적작용적공제관계재앵가해일대표현득비상명현.중일서사화남사괴체적자성기저특정십분상사,추측재해분랍장지전,이자위동일괴체.
We have studied the macro-distribution of magnetic basements in the South China Sea (SCS) based on the latest magnetic data and physical property analysis of rocks.The density and magnetic susceptibility structures along a profile across the SCS were inverted as the constraint to the whole region.The effects of different Reduction To Pole (RTP) methods in low-latitude areas were studied and applied to magnetic data of the study area.The Halo wavelet was used in multi-scale analysis of RTP magnetic data of the SCS.The result shows that the SCS can be divided into five zones according to the characteristics of magnetic anomalies.The northern margin of the SCS is more like a non-vocanic continental margin from the results of magnetic basement inversion and the profile inversion.In the Yinggehai area, the control effect of the magnetic basement to the sedimentary layers is obvious.The characteristics of the magnetic basements of the Zhongsha-Xisha block and Nansha block are very analogous.We infer that they might be of one block before extension of the sea basin.