A new perspective on the continent–ocean boundary of Palawan continental block identified with geophysical data
A new perspective on the continent–ocean boundary of Palawan continental block identified with geophysical data
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用地球物理数据识别巴拉望大陆块大陆-海洋边界的新视角
DOI：
10.1016/j.tecto.2022.229239
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发表时间：
2022-01
期刊：
影响因子：
2.9
通讯作者：
Jiabiao Li
中科院分区：
文献类型：
--
作者：
Weifeng Ding;Linjiang Qin;Xia Feng;Chunfang Wu;Guochao Wu;Yunyun Diao;Shaoru Yin;Chunguo Yang;Jinyao Gao;Jiabiao Li
巴拉望大陆块（PCB）和中央洋盆之间的大陆-海洋边界（COB）的位置仍然存在争议。对于大洋彼岸的具体位置，学者们的看法相差100多公里。为了在PCB中获得更合理的COB位置，根据新的船载地球物理数据，包括测深、重力、磁力和反射地震数据进行了综合解释。特别是对新的尾拖磁测资料进行了向上延拓，对总场磁异常（包括公众磁测资料和尾拖磁测资料）采用了分析信号分析（阿萨）处理。利用地球物理资料综合构造异常，如地形资料中的基性岩坡脚和岩浆火山，自由空气和布格重力异常梯度平缓，磁阿萨尖异常分界清晰，地震剖面结构显示为海陆过渡带，识别出最合理的PCB的COB。同时，构造建模沿着地震剖面被用来约束识别。精凸-凹型COB沿巴拉望西北坡脚沿着陆壳向海边界分布，具有超伸展薄壳、向海倾斜的铲状断层，合理地位于伸展减薄陆壳和扩张俯冲洋壳之间。
The location of the Continent–ocean boundary (COB) between the Palawan continent block (PCB) and the central oceanic basin remains controversial. There are more than 100 km difference among the scholars' view about the specific positions of the COB. To obtain a more reasonable location of the COB in the PCB, a comprehensive interpretation was conducted based on new shipborne geophysical data, including bathymetry, gravity, magnetic and reflection seismic data. In particular, upward continuation was applied to the new stern-towing magnetic data, and analytical signal analysis (ASA) processing was adopted for the total field magnetic anomalies, including both the public and stern-towing magnetic data. The most reasonable COB of PCB is just identified with the geophysical data based on the comprehensive structures' anomalies, such as the foot of massif slope and the magmatic volcanoes in topographic data, and the gentle gradient of the free-air and Bouguer gravity anomalies, and the clear dividing boundary in magnetic ASA sharp anomaly, and the seismic profiles structure's display in the Continent–ocean transition (COT). Meanwhile, structural modeling along the seismic profiles are used to constrained the identification. The refined convex–concave's COB is distributed at the seaward limit of the continental crust along the foot of northwest Palawan slope with a hyper-extended thinner crust, seaward-dipping listric faults, and is reasonably located between the extensive thinned continental crust and expansive subducting oceanic crust.
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影响因子：
2.9
作者：
Y. Pin;Z. Di;Zhao-shu Liu
通讯作者：
Y. Pin;Z. Di;Zhao-shu Liu
DOI：
--
发表时间：
2002
期刊：
Acta Geological Sinica
影响因子：
--
作者：
Wu Shi-min
通讯作者：
Wu Shi-min
影响因子：
3.5
作者：
Ke Ru;J. Pigott
通讯作者：
Ke Ru;J. Pigott
影响因子：
3
作者：
Zhen Sun;Zhihong Zhong;M. Keep;Di Zhou;Dongsheng Cai;Xusheng Li;Shimin Wu;Jianqun Jiang
通讯作者：
Zhen Sun;Zhihong Zhong;M. Keep;Di Zhou;Dongsheng Cai;Xusheng Li;Shimin Wu;Jianqun Jiang
DOI：
10.1007/s11430-006-1053-6
发表时间：
2006-10
期刊：
Science in China Series D: Earth Sciences
影响因子：
--
作者：
Zhen Sun;Di Zhou;Zhihong Zhong;B. Xia;X. Qiu;Z. Zeng;Jianqun Jiang
通讯作者：
Zhen Sun;Di Zhou;Zhihong Zhong;B. Xia;X. Qiu;Z. Zeng;Jianqun Jiang