The deep geology of South India inferred from Moho depth and<i>Vp</i>/<i>Vs</i>ratio

Das, Ritima; Saikia, Utpal; Rai, S.S.

doi:10.1093/gji/ggv351

Cited by 30 publications

(12 citation statements)

References 66 publications

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“…Figure , right, compares V P / V S ratios (and Moho depths) from Pan‐African neighbors of Sri Lanka, which also experienced a high grade metamorphic overprint. The Precambrian domains of southern Madagascar (Rindraharisaona et al, ), the Kerala Khondalite Belt in southern India (Das et al, ; Rai et al, ), and single stations in Africa, Madagascar, southern India, Sri Lanka, and East Antarctica (Rai et al, ) show similarly low V P / V S ratios between 1.65 and 1.78, thus also indicating felsic to intermediate bulk crustal compositions. The strong similarities of seismic crustal properties between the Pan‐African terranes, and the lack of correlation of crustal V P / V S and average V S to the surface geologic units in Sri Lanka, might be attributed to the region spanning unification of crustal structures through extensive overprinting during the Pan‐African Orogeny.…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…(right) Average crustal V P /V S (H stacking) and crustal thicknesses (joint inversion) from our study compared to other Pan-African terranes. Estimates are from the Precambrian domains in southern Madagascar (blue; Rindraharisaona et al, 2017), Kerala Khondalite Belt in southern India (red; Das et al, 2015;Rai et al, 2013), and from single stations in Africa, Madagascar, southern India, Sri Lanka, and East Antarctica (green; Rai et al, 2009); all estimates were derived from H stacking. Dashed line indicates a weak negative correlation between V P /V S and Moho depths derived in Sri Lanka.…”

Section: Journal Of Geophysicalmentioning

confidence: 99%

See 1 more Smart Citation

Crustal Structure of Sri Lanka Derived From Joint Inversion of Surface Wave Dispersion and Receiver Functions Using a Bayesian Approach

et al. 2020

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We study the crustal structure of Sri Lanka by analyzing data from a temporary seismic network deployed in 2016–2017 to shed light on the amalgamation process from a geophysical perspective. Rayleigh wave phase dispersion curves from ambient noise cross correlation and receiver functions were jointly inverted using a transdimensional Bayesian approach. The Moho depths in Sri Lanka range between 30 and 40 km, with the thickest crust (38–40 km) beneath the central Highland Complex (HC). The thinnest crust (30–35 km) is found along the west coast, which experienced crustal thinning associated with the formation of the Mannar Basin. VP/VS ratios lie within a range of 1.60–1.82 and predominantly favor a felsic to intermediate bulk crustal composition with a significant silica content of the rocks. A major intracrustal (18–27 km), slightly westward dipping (∼4.3°) interface with high VS (∼4 km/s) underneath is prominent in the central HC, continuing into the western Vijayan Complex (VC). The discontinuity might have been part of the respective units prior to the collision and could be an indicator for the proposed tilting of the Wanni Complex/HC crustal sections. It might also be related to the deep crustal HC/VC thrust contact with the VC as an indenting promontory of high VS. A low‐velocity zone in the central HC could have been caused by fluid influx generated by the thrusting process.

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Section: Interpretation and Discussionmentioning

confidence: 99%

Section: Journal Of Geophysicalmentioning

confidence: 99%

Crustal Structure of Sri Lanka Derived From Joint Inversion of Surface Wave Dispersion and Receiver Functions Using a Bayesian Approach

et al. 2020

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“…While the offset in the Western Ghats is attributed to its differential uplift during the India-Madagascar separation, the one at the contact between WDC and EDC is ascribed to the presence of a steeply dipping fault that separates them. Further, RF analysis by Das et al (2015) suggested a broad variation in the Moho depth from 33-40 km in South India, except beneath the (WDC) and Southern Granulite terrain (SGT) (Fig. 3).…”

Section: South Indian Shieldmentioning

confidence: 94%

A review of seismological research in India during the past five years (2015-2019)

Srijayanthi¹,

Kumar²,

Gahalaut³

2020

PINSA

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“…Figure 9, right, compares V P /V S ratios (and Moho depths) from Pan-African neighbors of Sri Lanka which also experienced a high grade metamorphic overprint. The Precambrian domains of southern Madagascar (Rindraharisaona et al, 2017), the Kerala Khondalite Belt in southern India (Das et al, 2015;S. Rai et al, 2013), and single stations in Africa, Madagascar, southern India, Sri Lanka and East Antarctica (A.…”

Section: Average Crustalmentioning

confidence: 99%

Crustal structure of Sri Lanka derived from joint inversion of surface wave dispersion and receiver functions using a Bayesian approach

Dreiling¹,

Tilmann²,

Yuan³

et al. 2019

Preprint

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We study the crustal structure of Sri Lanka by analyzing data from a temporary seismic network deployed in 2016--2017 to shed light on the amalgamation process from a geophysical perspective. Rayleigh wave phase dispersion curves from ambient noise cross-correlation and receiver functions were jointly inverted using a transdimensional Bayesian approach.The Moho depths in Sri Lanka range between 30 and 40~km, with the thickest crust (38-40 km) beneath the central Highland Complex (HC). The thinnest crust (30-35 km) is found along the west coast, which experienced crustal thinning associated with the formation of the Mannar Basin. Vp/Vs ratios lie within a range of 1.60-1.82 and predominantly favor a felsic to intermediate bulk crustal composition with a significant silica content of the rocks.A major intra-crustal (18-27~km), slightly westward dipping (~4.3$^\circ$) interface with high Vs (~4 km/s) underneath is prominent in the central HC, continuing into the western Vijayan Complex (VC). The discontinuity might have been part of the respective units prior to the collision and could be an indicator for the proposed tilting of the WC/HC crustal sections. It might also be related to the deep crustal HC/VC thrust contact with the VC as an indenting promontory of high Vs. A low velocity zone in the central HC could have been caused by fluid influx generated by the thrusting process.

show abstract

The deep geology of South India inferred from Moho depth andVp/Vsratio

Cited by 30 publications

References 66 publications

Crustal Structure of Sri Lanka Derived From Joint Inversion of Surface Wave Dispersion and Receiver Functions Using a Bayesian Approach

Crustal Structure of Sri Lanka Derived From Joint Inversion of Surface Wave Dispersion and Receiver Functions Using a Bayesian Approach

A review of seismological research in India during the past five years (2015-2019)

Crustal structure of Sri Lanka derived from joint inversion of surface wave dispersion and receiver functions using a Bayesian approach

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