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Structural Characteristics of the Andaman Forearc Inferred from Interpretation of Multichannel Seismic Reflection Data期刊论文

作者: Anitha GOLI Dhananjai K. PANDEY

页码: 1145-1156
被引频次: 8
出版者: WILEY-BLACKWELL,Wiley Subscription Services, Inc
ISSN: 1000-9515,0001-5717
卷期: Volume:88    Issue:4
语言: English
摘要: 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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