摘要
海南岛幅重力异常基本特征是自由空间异常呈现北高、南低的变化趋势,布格重力异常表现为随着水深加大,异常值增大,由西北向东南方向(南海海盆)逐渐增高。海南岛幅磁异常基本特征是以负值为主,东部磁异常走向主要为北东和东西向,西部磁异常走向主要为北西向。陆架区为低缓负异常,陆坡区为局部负异常及正负伴生异常,深海盆地为急剧变化的条带状异常,而西沙群岛为局部急剧变化的异常。依据重磁场异常,结合相关的地形、地貌、地质构造等资料对海南岛幅进行合理分区,并初步进行地质因素分析。
The geophysical character of the map of hainandao is the free gravity anomaly is high in the north and low in the south. The bouguer gravity anomaly is low in the north and high in the south, changing highly as the water changing deeply. The magnetic anomaly is mainly negative in this area. The tend towards of the bouguer gravity anomaly is N-E or W-E in the east and W-N in the west. The bouguer gravity anomaly is negative slowly in the continental shelf, and negative local with positive in the land shelf. The geophysical character is low and negative in continental shelf, negative and positive in the continental slope, high and long in the nanhai basin, sharp in the xisha islands. Through the Geophysical anomaly, landform, physiognomy and geological conformation, got the correct subarea of geophysical abnormity , and explain the causation of it .
出处
《南海地质研究》
2007年第1期111-117,共7页
Gresearch of Eological South China Sea
关键词
重磁场特征
海南岛幅
特征分区
Geophysical character The map of hainandao Character division
