孟加拉湾盆地构造特征与动力学演化：来自卫星重力与地震资料的新认识

张朋; 梅廉夫; 马一行; 李任远; 尹宜鹏

doi:10.3799/dqkx.2014.123

Volume 39 Issue 10

Oct. 2014

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Zhang Peng, Mei Lianfu, Ma Yixing, Li Renyuan, Yin Yipeng, 2014. Tectonic Features and Dynamic Evolution of Bay of Bengal Basin: New Insights into Satellite-Gravity and Seismic Data. Earth Science, 39(10): 1307-1321. doi: 10.3799/dqkx.2014.123

Citation:

Zhang Peng, Mei Lianfu, Ma Yixing, Li Renyuan, Yin Yipeng, 2014. Tectonic Features and Dynamic Evolution of Bay of Bengal Basin: New Insights into Satellite-Gravity and Seismic Data. Earth Science, 39(10): 1307-1321. doi: 10.3799/dqkx.2014.123

Citation:

Zhang Peng, Mei Lianfu, Ma Yixing, Li Renyuan, Yin Yipeng, 2014. Tectonic Features and Dynamic Evolution of Bay of Bengal Basin: New Insights into Satellite-Gravity and Seismic Data. Earth Science, 39(10): 1307-1321. doi: 10.3799/dqkx.2014.123

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Tectonic Features and Dynamic Evolution of Bay of Bengal Basin: New Insights into Satellite-Gravity and Seismic Data

doi: 10.3799/dqkx.2014.123

1.
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
CNOOC Research Institute, Beijing 100027, China
3.
Exploration and Development Research Institute of Liaohe Oilfield, Panjin 124010, China

Received Date: 2014-02-13
Publish Date: 2014-10-01

Abstract

Abstract

Based on the satellite-derived gravity data processed by applying various image enhancement methods (including filter, gradient and continuation) and processing of the standardized seismic profiles, plus the establishment of 8 major seismic cross sections, the tectonic features and dynamic evolution of the bay of Bengal basin are explored in this study. Free-air gravity anomalies and their results of enhanced processing indicate that there are NW-trending fracture zones in the west, EW-trending faults in the 90°E ridge, and NE-trending linear structures in the east of the basin, which suggest the influence of sea floor spreading, ridge emplacement and Indian Ocean crust subduction. According to the standardized seismic reflection profiling results, gravity anomalies and stratum thickness, the basin is divided into the following five tectonic units: west depression, 85°E ridge, central depression, 90°E ridge and Rakhine depression. Prior to the collision, the sedimentary framework was controlled by multiple isolated rises developed in 85°E ridge, which was the response of episodic eruption processes of the hotspot. Whereas, the post collisional sediments known as the Bengal fan sediments were not prominently affected by the ridge and the sediments kept on migrating southward during the Eocene to Miocene. The subduction of the 90°E ridge promoted the westward growth of Andaman accretionary in the south (7°-14°N) and controlled the evolution of Rakhine depression, Indo-Burmese wedge and the depocenter of the bay of Bengal basin in the north (14°-20°N). It is found that the protooceanic basin stage (Late Cretaceous to Early Oligocene) and the remnant ocean basin stage (Late Oligocene to present) are two main episodes in the bay of Bengal basin.
- the bay of Bengal basin,
- tectonics,
- sedimentation,
- dynamic evolution,
- satellite-gravity,
- 90°E ridge.

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References(54)

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