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Late Cenozoic seismic stratigraphy of the Andaman Forearc Basin,Indian Ocean

Petroleum Science 2017年第4期14卷 648-661页

作者： Dhananjai K.Pandey Goli Anitha ramesh prerna Anju Pandey ESSO-National Centre for Antarctic and Ocean Research Headland SadaVasco da GamaGoa 403 804India

Interpretation of new multichannel seismic reflection data from the Andaman Forearc Basin(AFB) in the northern Indian Ocean is presented here. The highquality multichannel seismic data from the Andaman Forearc region enable us to examine the seismic characters and to demarcate seismic sequences bounded by distinct unconformities. Ages of marked seismic horizons have been calibrated with available litholog data from nearby industry boreholes. Seismic interpretation of new data shows that the AFB is filled with * 4.5-s-two way travel time(TWT) thick Neogene to Recent sediments. The entire basin assemblage exhibits two distinct major sequences pertaining to the Neogene and Quaternary times. A large part of the basin is filled with intermittent mass transport deposits(MTD). We infer that the episodic uplift of the Invisible Bank, protuberance of the outerarc and regular deformation through reactivation of preexisting normal faults since the Pleistocene could be attributed as causal mechanisms for the MTDs. Strong bottom simulating reflectors are identified in the Late Miocene and younger sediments of the outerarc and AFB at a depth of * 0.6 s TWT and correspond to the presence of gas hydrates in this region. Our interpretations have significant implications for geodynamic as well as resource exploration in the AFB.

关键词： Andaman Forearc Basin Neogene Uplift Invisible Bank Outerarc Stratigraphy

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Assessment of Recent Tectonic Activity along the Yamuna Basin, Garhwal Region, NW-Himalaya, India: Based on Morphotectonic Analysis

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Open Journal of Geology 2021年第12期11卷 734-755页

作者： prerna Gahlaut ramesh Chandra Patel Ramamoorthy Ayyamperumal Madhusudan Sati Dinesh Chandra Nainwal Department of Geology H.N.B. Garhwal University Srinagar India Department of Geology Banaras Hindu University Varanasi India MOE Key Laboratory of Western China’s Environmental System College of Earth and Environmental Sciences Lanzhou University Lanzhou China SDM Government Post Graduate College Affiliated by SDSUV Dehradun India

Decoupling between climate and tectonics, transform the elevation of earth surface regionally by denudation and displacement of land. To extract the tectonic footprints on morphology of landform, geormophometry is widely accepted tool due to visible responses in Drainage architecture to an intense tectonic environment. The present morphology of Yamuna basin in the Garhwal Himalaya, India is a result of continuing crustal deformation;erosion and deposition in the area. The drainage system and geomorphic expression of topography have been significantly influenced by active tectonics in this basin. In present study, for numerical modelling to detect the influence of tectonic signals on landform, we used morphotectonic parameters, to gradient index (SL), valley floor height to width ratio (Vf), asymmetry factor (Af), basin shape index (BS) and hypsometric integral (HI), extracted from SRTM DEM with resolution of 30 m. All these morphotectonic parameters are integrated to produce an index of relative active tectonics (IRAT). The Yamuna basin is classified into three groups based on IRAT, very high (2.25) based on the degree of tectonic activity. Result shows approx. 56% of Yamuna basin experience high tectonic activity. This along strike deformation pattern pronouncedly emulates subsurface geometry based tectonic model.

关键词： Active Tectonics Landform Evolution Morphotectonic Parameters Landslide IRAT

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