Structural features in the mid-southern section of the Kyushu–Palau Ridge based on satellite altimetry gravity anomaly

IF 1.4 3区 地球科学 Q3 OCEANOGRAPHY
Feifei Zhang, Dingding Wang, Xiaolin Ji, Fanghui Hou, Yuan Yang, Wanyin Wang
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Abstract

The Kyushu–Palau Ridge (KPR), an anti-S-shaped submarine highland at the center of the Philippine Sea Plate (PSP), is considered the residual arc of the Izu–Bonin–Mariana Island Arc, which retains key information about the cessation of the Western Philippine Basin (WPB) expansion and the Parece Vela Basin (PVB) breakup. Herein, using the new generation of satellite altimetry gravity data, high-precision seafloor topography data, and newly acquired ship-borne gravity data, the topographic and gravity characteristics of the KPR mid-southern section and adjacent region are depicted. The distribution characteristics of the faults were delineated using the normalized vertical derivative–total horizontal derivative method(NVDR-THDR) and the minimum curvature potential field separation method. The Moho depth and crustal thickness were inverted using the rapid inversion method for a double-interface model with depth constraints. Based on these results, the crust structure features in the KPR mid-southern section, and the “triangular” structure geological significance where the KPR and Central Basin Rift (CBR) of the WPB intersect are interpreted. The KPR crustal thickness is approximately 6–16 km, with a distinct discontinuity that is slightly thicker than the normal oceanic crust. The KPR mid-southern section crust structure was divided into four segments (S1–S4) from north to south, formed by the CBR eastward extension joint action and clockwise rotation of the PVB expansion axis and the Mindanao fault zone blocking effect.

基于卫星测高重力异常的九州-帕劳海脊中南段结构特征
九州-帕劳海脊(KPR)是菲律宾海板块(PSP)中心的一个反S形海底高地,被认为是伊豆-波宁-马里亚纳岛弧的残余弧,保留了西菲律宾海盆(WPB)扩张停止和帕雷切维拉海盆(PVB)断裂的关键信息。本文利用新一代卫星测高重力数据、高精度海底地形数据和新获得的船载重力数据,描绘了 KPR 中南段及邻近地区的地形和重力特征。利用归一化垂直导数-总水平导数法(NVDR-THDR)和最小曲率势场分离法划分了断层的分布特征。采用快速反演法对有深度约束的双界面模型进行了莫霍深度和地壳厚度反演。根据这些结果,解释了 KPR 中-南段的地壳结构特征,以及 KPR 与 WPB 中央盆地裂谷(CBR)相交处的 "三角形 "结构的地质意义。KPR 地壳厚度约为 6-16 千米,有明显的不连续性,比正常大洋地壳略厚。KPR中南段地壳结构自北向南分为四段(S1-S4),由CBR东伸联合作用和PVB扩张轴顺时针旋转以及棉兰老岛断层带阻挡作用形成。
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来源期刊
Acta Oceanologica Sinica
Acta Oceanologica Sinica 地学-海洋学
CiteScore
2.50
自引率
7.10%
发文量
3884
审稿时长
9 months
期刊介绍: Founded in 1982, Acta Oceanologica Sinica is the official bi-monthly journal of the Chinese Society of Oceanography. It seeks to provide a forum for research papers in the field of oceanography from all over the world. In working to advance scholarly communication it has made the fast publication of high-quality research papers within this field its primary goal. The journal encourages submissions from all branches of oceanography, including marine physics, marine chemistry, marine geology, marine biology, marine hydrology, marine meteorology, ocean engineering, marine remote sensing and marine environment sciences. It publishes original research papers, review articles as well as research notes covering the whole spectrum of oceanography. Special issues emanating from related conferences and meetings are also considered. All papers are subject to peer review and are published online at SpringerLink.
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