Crustal Structure of Philippine Sea Plate: Insights from Gravity Inversions Constrained by Deep Seismic
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摘要: 为了深入理解菲律宾海板块各地质构造单元的深部结构以及九州‒帕劳洋脊地壳特征，利用卫星测高重力异常，结合研究区域水深、沉积层厚度及洋壳年龄数据校正变密度沉积层重力效应和热扰动重力效应，并利用KPR上OBS剖面得到的莫霍面深度作为重力反演莫霍面的约束，计算了菲律宾海板块研究区的莫霍面深度及地壳厚度.结果显示菲律宾海板块整体地壳厚度呈现从西到东、从南到北依次增厚的特征.西菲律宾海盆莫霍面深度在10 km左右，地壳厚度在4 km左右.帕里西维拉海盆地壳厚度平均在7 km左右，大于年老的西菲律宾海盆.九州‒帕劳洋脊地壳厚度最厚为14 km，在18°~19°N处厚度为8 km左右，接近帕里西维拉海盆洋壳厚度，不存在局部显著增厚地壳，KPR地壳为弧后岩浆活动改造的洋壳，而非成熟岛弧地壳.Abstract: In order to understand the deep structure of the geological tectonic units of the Philippine Sea plate and the crustal feature of the Kyushu-Palau Ridge, this paper uses satellite gravity anomaly, combined with the bathymetry, sediment thickness and oceanic crust age data in the study area to correct the gravity effects of sediment and thermal disturbance. The Moho depth and crustal thickness of the Philippine Sea plate were calculated by combining Moho depth data from OBS profiles cross the KPR as constraints. The results show that the overall crustal thickness of the Philippine Sea plate is characterized by a gradual increase from west to east and from south to north. The Moho depth of the West Philippine Basin is about 10 km, with a crustal thickness of about 4 km. The average crustal thickness of the Parece Vela Basin is about 7 km, which is larger than that of the older West Philippine Basin.The crustal thickness of the Kyushu-Palau Ridge is 14 km at the maximum. In the 18°-19°N segment of the KPR, the crust is about 8 km, which is similar to the normal oceanic crust thickness in the Parece Vela Basin. There is no significant thickening crust. The crustal properties of the KPR are oceanic crust that has been thickened by back-arc magmatism, rather than mature island arc crust.
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Key words:
- West Philippine Basin /
- Kyushu-Palau Ridge /
- Parece Vela Basin /
- crustal thickness /
- crustal property /
- marine geology
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图 2 菲律宾海板块空间重力异常
黑色线代表地震测线位置，红色圆圈代表反演用到的约束点
Fig. 2. Free-air gravity anomaly of the Philippine Sea plate
图 4 沉积物重力效应(a); 热扰动重力效应(b); 热校正后的布格重力异常(c)
Fig. 4. Predicted attractions of the sediment-crust interface (a); effect of thermal gravity anomalies (b); Bouguer anomalies after thermal correction (c)
图 5 莫霍面深度反演结果与地震约束点偏差直方图
Fig. 5. The deviation histogram of the Moho depth inversion results and seismic constraint points
图 6 菲律宾海板块地壳厚度分布
黑色虚线为5条剖面位置
Fig. 6. Crustal thickness distribution of the Philippine Sea plate
图 7 10°N剖面图(a); 15°N剖面图(b); 20 °N剖面图(c); 130°E剖面图(d); 140°E剖面图(e)
WPB.西菲律宾海盆；KPR.九州‒帕劳洋脊；PVB.帕里西维拉海盆；CP.卡洛琳板块；WMR.西马里亚纳脊；SB.四国海盆；RT.琉球海沟；EP.欧亚板块
Fig. 7. Profile of the 10°N (a); profile of the15°N (b); profile of the 20 °N (c); profile of the 130°E (d); profile of the 140°E (e)
图 8 KPR沿脊地壳厚度
a. KPR沿脊地壳厚度与岩石年龄分布对比，根据Ishizuka et al.（2011）修改；b. KPR沿脊水深、莫霍面深度、地壳厚度
Fig. 8. Crustal thickness along the KPR
图 9 重力反演结果与地震剖面对比
a.kpr 22测线对比图；b.kpr24测线对比图；c.KPR2020-2测线对比图；d.KPR2020-3测线对比图；e.KPR地壳厚度及4条测线位置，箭头表示测线方向
Fig. 9. Comparison of gravity inversion results with seismic profiles
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