Crustal structure and tectonics of Bangladesh: New constraints from inversion of receiver functions

Singh, Arun; Bhushan, Kirti; Singh, Charan; Steckler, Michael S.; Akhter, S. H.; Seeber, Leonardo; Kim, Youn-Jung; Tiwari, Ashwani Kant; Biswas, Rahul

doi:10.1016/j.tecto.2016.04.046

Cited by 64 publications

(61 citation statements)

References 51 publications

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“…We prepared an updated crustal thickness map using published results from controlled source seismics and RFs (Singh et al, ). The crustal thickness estimates from the present study are complemented with those from recent publications (Western Tibet, Zhang et al, ; Gilligan et al, ; Bengal Basin, Singh et al, ; Southern Granulites, Sharma et al, ; western DVP, Chopra et al, ; K. M. Rao et al, ; Singbhum, Mandal & Biswas, ), for completeness. The final map produced still has data gaps from central India and parts of northern Tibet (Figure ).…”

Section: Seismic Character Of the Crustmentioning

confidence: 73%

“…The central portions of Himalaya and southern Tibet are sampled by a temporary network of 26 seismic stations under the project HIMNT (2001HIMNT ( -2002 (Monsalve et al, 2006). Data from other networks like MIT-CHINA (24 seismic stations, 2003, eastern Tibet), NAMCHEBARWA (45 seismic stations, 2003, BHUTAN (5 seismic stations, Bhutan Himalaya) (Lev et al, 2006;Nábȇlek et al, 2009;Sol et al, 2007;Velasco et al, 2003), and those from 8 seismic stations in Bangladesh (Singh et al, 2016) and 27 stations in southern Tibet (ST) (IRIS Network, Gilligan et al, 2015) are also used.…”

Section: Waveform Datamentioning

confidence: 99%

“…These are mainly of Himalayan origin covering the Indo‐Gangetic plains with very thick sedimentary deposits (>8 km). Influx of clastic sediments from the Himalaya resulted in ∼17 km thick sediments beneath the Bengal basin (Singh et al, ). The crustal structure of Indo‐Gangetic plains is not well resolved due to the lack of seismic stations within the foredeep (Singh et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Crustal Structure Beneath India and Tibet: New Constraints From Inversion of Receiver Functions

et al. 2017

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The Indian subcontinent comprises geological terranes of varied age and structural character. In this study, we provide new constraints to existing crustal models by inverting the P‐to‐s receiver functions (RFs) at 317 broadband seismic stations. Inversion results fill crucial gaps in existing velocity models (CRUST1.0 and SEAPS) by capturing regions which are less represented. The final model produced is much more heterogeneous and is able to capture the structural variations between closely spaced seismic stations. In comparison to the global models, major differences are seen for seismic stations located over various rift zones (e.g., Godavari, Narmada, and Cambay) and those close to the coastal regions where transition from oceanic to continental crust is expected to create drastic changes in the crustal configuration. Seismic images are produced along various profiles using 49,682 individual RFs recorded at 442 seismic stations. Lateral variations captured using migrated images across the Himalayan collisional front revealed the hitherto elusive southern extent of the Moho and intracrustal features south of the Main Central Thrust (MCT). Poisson's ratio and crustal thickness estimates obtained using H‐k stacking technique and inversion of RFs are grossly similar lending credence to the robustness of inversions. An updated crustal thickness map produced using 1,525 individual data points from controlled source seismics and RFs reveals a (a) thickened crust (>55 km) at the boundary of Dharwar Craton and Southern Granulite Terrain, (b) clear difference in crustal thickness estimates between Eastern Dharwar Craton and Western Dharwar Craton, (c) thinner crust beneath Cambay Basin between southwest Deccan Volcanic Province and Delhi‐Aravalli Fold Belt, (d) thinner crust (<35 km) beneath Bengal Basin, (e) thicker crust (>40 km) beneath paleorift zones like Narmada Son Lineament and Godavari Graben, and (f) very thick crust beneath central Tibet (>65 km) with maximum lateral variations along the Himalayan collision front.

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Section: Seismic Character Of the Crustmentioning

confidence: 73%

Section: Waveform Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Crustal Structure Beneath India and Tibet: New Constraints From Inversion of Receiver Functions

et al. 2017

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“…Our work advances the discussion regarding the relative importance of strain partitioning (Clark and Bilham, 2008;Coutand et al, 2014) versus orographic precipitation linked to SP uplift (Grujic et al, 2006) in influencing Himalayan exhumation rates to its north, and provides a framework for interpreting the present-day crustal structure of the SP and flanking regions (e.g., Mitra et al, 2005;Singh et al, 2016). Additionally, we provide new insights into the behavior of basement-cored foreland uplifts applicable to other orogens (e.g., Jordan and Allmendinger, 1986;Kober et al, 2013), as well as to older ranges where early records of uplift have been destroyed.…”

Section: Introductionmentioning

confidence: 70%

Timing and mechanism of the rise of the Shillong Plateau in the Himalayan foreland

Govin

Najman

Copley

et al. 2018

Geology

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The Shillong Plateau (northeastern India) constitutes the only significant topography in the Himalayan foreland. Knowledge of its surface uplift history is key to understanding topographic development and unraveling tectonic-climate-topographic coupling in the eastern Himalaya. We use the sedimentary record of the Himalayan foreland basin north of the Shillong Plateau to show that the paleoBrahmaputra river was redirected north and west by the rising plateau at 5.2-4.9 Ma. We suggest that onset of plateau uplift is a result of increased fault-slip rates in response to stresses caused by the Indian lithosphere bending beneath the Himalaya.

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“…A similar situation may prevail in the Bengal Basin where two different mechanisms, frozen anisotropic fabric developed due to the downwelling Indian lithosphere beneath the Burmese Arc and APM‐related strain of the Indian plate, are producing nulls. Another strong possibility is a disturbed and highly heterogeneous mantle lithosphere beneath the Bengal Basin under the effect of the Kereguelen plume magmatism at ∼116 Ma (Singh, Bhushan, et al, ). Geochemical and geochronological data sets obtained using flood basalt rock samples from the Rajmahal‐Shylet‐Bengal traps (Figure ) show evidence of Kergulelen plume activity (∼116 Ma; Baksi, ; Basu et al, ; Kent et al, ; Ray et al, ).…”

Section: Discussionmentioning

confidence: 99%

Mantle Deformation in the Eastern Himalaya, Burmese Arc and Adjoining Regions

Saikia

Kumar

Singh

et al. 2018

Geochem Geophys Geosyst

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This study presents new results of shear wave splitting at 56 broadband stations installed in the Eastern Himalaya, Burmese Arc, and adjoining regions. The fast polarization directions (FPDs) within the Himalaya, Burmese Arc and the foredeep are parallel to the strike of the orogens, suggesting a coherently deformed lithospheric mantle under compression. The FPDs follow the Main Boundary Thrust and the Main Central Thrust in the central segment of the Arunachal Himalaya. Smaller delay times (∼0.7 s) can be best explained by multiple layers of anisotropy, where combined effects of the anisotropic fabric of a coherently deformed lithosphere of the Arunachal Himalaya and plate motion related strain are playing a role. Null measurements in the Siang window may be due to the Indian plate interaction with Eurasia and Burma plates, causing different layers of anisotropy. Another possibility is the coincidence of source polarization direction with the fast axis. In the Bengal Basin, the Nulls could be due to annihilation of frozen anisotropy in the downwelling Indian lithosphere and the APM‐related strain, or a highly heterogeneous mantle affected by the Kereguelen plume magmatism, at ∼116 Ma.

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Crustal structure and tectonics of Bangladesh: New constraints from inversion of receiver functions

Cited by 64 publications

References 51 publications

Crustal Structure Beneath India and Tibet: New Constraints From Inversion of Receiver Functions

Crustal Structure Beneath India and Tibet: New Constraints From Inversion of Receiver Functions

Timing and mechanism of the rise of the Shillong Plateau in the Himalayan foreland

Mantle Deformation in the Eastern Himalaya, Burmese Arc and Adjoining Regions

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