| Structural Characteristics of the Andaman Forearc Inferred from Interpretation of Multichannel Seismic Reflection Data |
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| 作者姓名： | Anith GOLI and Dhananjai K. Pandey |
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| 作者单位： | National Centre for Antarctic and Ocean Research, Vasco da Gama, Goa-403 804, India |
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| 摘 要： | The Andaman Forearc Basin(AFB) is asymmetric in configuration and filled with a ~6 kmthick pile of Neogene to Recent sediments(~4 s in two-way travel time:TWT) with distinct zonation.It shows gradual thinning up to ~3 km(0.8 s in TWT) towards the eastern end with a seabed gradient of 1:30.Thick deformed sediments ~2 s(TWT) of the Outerarc are associated with intense faulting and occasional folding caused by recent tectonics.Development of a series of faults within the upwarped sedimentary column of Oligocene top to Recent is observed with a rotated fault block.These features are manifestations of Recent igneous intrusion,and reveal the presence of a mild N–S compressional regime.Its effect on the AFB resulted in further uplift of sediments,which can now be seen as the Invisible Bank.Forward gravity modelling supporting our seismic interpretation reveals that it is associated with igneous intrusion from the Moho(~9 km depth),and also suggests that continental crust underlies the AFB.Strong Bottom Simulating Reflector(BSR)-like features in the Miocene sediments of Outerarc and Forearc basin at a depth of 0.6 s below the seabed suggest the inferred probable occurrence of gas hydrates in the AFB.
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| 关 键 词： | 地震反射资料 解释结构 近代沉积物 火成岩侵入 多道 空军基地 天然气水合物 弧前盆地 |
| 收稿时间： | 2014/2/11 0:00:00 |
| 修稿时间： | 2014/4/25 0:00:00 |
Structural Characteristics of the Andaman Forearc Inferred from Interpretation of Multichannel Seismic Reflection Data |
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| Authors: | Anitha GOLI Dhananjai K PANDEY |
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| Institution: | National Centre for Antarctic and Ocean Research, Vasco da Gama, Goa-403 804, India |
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| Abstract: | The Andaman Forearc Basin (AFB) is asymmetric in configuration and filled with a ～6 km‐thick pile of Neogene to Recent sediments (～4 s in two‐way travel time: TWT) with distinct zonation. It shows gradual thinning up to ～3 km (0.8 s in TWT) towards the eastern end with a seabed gradient of 1:30. Thick deformed sediments ～2 s (TWT) of the Outerarc are associated with intense faulting and occasional folding caused by recent tectonics. Development of a series of faults within the upwarped sedimentary column of Oligocene top to Recent is observed with a rotated fault block. These features are manifestations of Recent igneous intrusion, and reveal the presence of a mild N–S compressional regime. Its effect on the AFB resulted in further uplift of sediments, which can now be seen as the Invisible Bank. Forward gravity modelling supporting our seismic interpretation reveals that it is associated with igneous intrusion from the Moho (～9 km depth), and also suggests that continental crust underlies the AFB. Strong Bottom Simulating Reflector (BSR)‐like features in the Miocene sediments of Outerarc and Forearc basin at a depth of 0.6 s below the seabed suggest the inferred probable occurrence of gas hydrates in the AFB. |
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| Keywords: | Structural geology tectonics Tertiary hydrocarbon potential upwarp Andaman Indian Ocean |
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