冲绳海槽及邻区重力异常特征及其地质意义

发布时间：2018-01-18 03:08

本文关键词：冲绳海槽及邻区重力异常特征及其地质意义　出处：《中国海洋大学学报(自然科学版)》2016年06期 　论文类型：期刊论文

【摘要】：通过分析冲绳海槽及邻区自由空间重力异常和布格重力异常的分布特征,对其构造地质学意义进行了定性研究。冲绳海槽空间重力异常和布格重力异常较高,与其下地幔物质上涌引起的质量盈余有关;海底正向地形单元、基底隆起等具有较高的空间重力异常,而地壳浅部低密度岩浆房表现为较低的空间重力异常;布格重力异常及其上延结果反映了地壳厚度的变化,冲绳海槽地壳显著减薄,台湾地区地壳显著增厚;琉球岛弧及弧前布格重力异常受菲律宾海板片俯冲和岛弧地壳结构的共同影响,俯冲洋壳与琉球岛弧地壳的接触带位于琉球海沟以西,大致与120mGal布格重力异常等值线相对应。
[Abstract]:By analyzing the distribution characteristics of free space gravity anomaly and Bouguer gravity anomaly in Okinawa trough and adjacent area, the tectonic geological significance is qualitatively studied. The spatial gravity anomaly and Bouguer gravity anomaly in Okinawa trough are relatively high. It is related to the mass surplus caused by material upwelling in the lower mantle. The seafloor forward topographic unit and basement uplift have higher spatial gravity anomalies, while the shallow crust low-density magmatic chambers exhibit lower spatial gravity anomalies. The results of Bouguer gravity anomaly and its upwelling reflect the variation of crustal thickness. The crust of Okinawa trough is obviously thinned and the crust of Taiwan area is obviously thickened. The gravity anomalies of Ryukyu island arc and front arc are influenced by the subduction of the Philippine sea plate and the crustal structure of the island arc. The contact zone between the subduction ocean crust and the Ryukyu arc crust is located west of the Ryukyu trench. It corresponds roughly to the contour line of 120m Gal Bouguer gravity anomaly.
【作者单位】：中国海洋大学环境科学与工程学院;国土资源部海洋油气资源与环境地质重点实验室;青岛海洋地质研究所;
【基金】：国家重点基础研究发展计划项目(2013CB429701)资助~~
【分类号】：P736.1;P738.2
【正文快照】： 引用格式:尚鲁宁,张训华,韩波.冲绳海槽及邻区重大异常特征及其地质意义[J].中国海洋大学学报(自然科学版),2016,46(6):68-73.SHANG Lu-Ning,ZHANG Xun-Hua,HAN Bo.Gravity anomaly and its geological implications of the okinawa trough andadjacent areas[J].Periodical o

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