Lithosphere structure beneath the eastern Dharwar craton kimberlite field, India, inferred from joint inversion of surface wave dispersion and receiver function data

Chaubey, Dipak Kumar; Rai, S.S.; Mullick, N.; Das, Ritima

doi:10.1016/j.precamres.2023.107112

Cited by 3 publications

(2 citation statements)

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“…The LAB varies from ∼80 km near the coast, increasing to ∼120-140 km at the Western Ghat and farther east. This is significantly lower than the 165-180 km for the east and west Dharwar craton (Chaubey et al, 2023). In the shallower lithosphere, we observe three ∼10 km thick LVLs (−2% to −4%) at depths of 50-60 km and 90-110 km.…”

Section: Velocity-depth Section Mappingmentioning

confidence: 54%

“…Deep drill hole samples from the Koyna region, about 100 km south of this profile, show that the basement of the DVP closely resembles the Dharwar craton (Ray et al, 2021). Our results show a significant decrease in lithospheric thickness (80-100 km) to the west of the Western Ghat, in contrast with 120-140 km to its east, suggesting significant deformation of the DVP lithosphere compared to the neighboring Dharwar craton, where the lithosphere is mapped at ∼165 km (Chaubey et al, 2023;Mullick et al, 2022). In an earlier study, Saha et al (2020) showed that the craton-like lithosphere beneath DVP exists only to the east of 76°E, about 300 km from the coast.…”

Section: The Lithosphere Mantle-plume Scarmentioning

confidence: 54%

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Cryptic Magma Chamber in the Deccan Traps Imaged Using Receiver Functions and Surface Wave Dispersion

Saha,

Kumar,

Chaubey

et al. 2023

Geophysical Research Letters

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An anomalous crust and lithospheric mantle in the Deccan Volcanic Province are imaged below a 160 km long W‐E profile through the joint inversion of receiver functions and surface wave dispersion. The upper crust has an unusually low S‐wave velocity (Vs ∼ 3.3–3.5 km/s) at 8–17 km depth, underlying a 4 km thick high‐velocity layer (Vs > 3.8 km/s). The low velocity possibly represents the frozen magma reservoir, the source for the magma eruption at ∼65 Ma due to the interaction of the Reunion plume with India. The shallow, high‐velocity layer could be basaltic mafic intrusions responsible for the production of massive CO2 degassing. The Moho deepens beneath the west coast to ∼45 km due to 10–15 km of magma underplating. The mantle plume scar is seen as thinned lithosphere (80–100 km), with the presence of long‐lived low‐velocity layers in the shallow mantle attributed to the presence of sulfide melts.

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Section: Velocity-depth Section Mappingmentioning

confidence: 54%

Section: The Lithosphere Mantle-plume Scarmentioning

confidence: 54%

Cryptic Magma Chamber in the Deccan Traps Imaged Using Receiver Functions and Surface Wave Dispersion

Saha,

Kumar,

Chaubey

et al. 2023

Geophysical Research Letters

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Internal structure of India: perspectives from a review of the seismological imaging studies from 2020 to 2023

Paul,

Gahalaut

2024

Proc.Indian Natl. Sci. Acad.

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Mineral chemistry of chrome-diopside bearing lamprophyre from Mesoproterozoic Settupalle igneous complex of Prakasam alkaline province: insights on the magma dynamics at shallow lithospheric mantle beneath the NE margin of the Cuddapah basin, Southern India

Sridhar,

Reddy,

Pandey

et al. 2024

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The Eastern Dharwar Craton (EDC) shows considerable variations in the activity of Kimberlite, lamproite, and lamprophyre and their related lithospheric thickness, thermal structure, and magmatic source characteristics from the innermost core to the margin. These variations have been revealed through seismic studies and the analysis of xenoliths, and xenocrysts carried in alkaline magmas, particularly kimberlites. This study reports the occurrence of chrome diopside phenocrysts from a lamprophyre of the Settupalle pluton, located on the northeastern margin of the Cuddapah basin, Prakasam Alkaline Province (PAP) in South India. Studied lamprophyre characterized by phenocrystic clinopyroxene (Cpx) and biotite, embedded in a groundmass of amphibole, biotite, opaques, calcite, feldspar, nepheline, and sodalite, with the latter minerals forming ocellar structures. Clinopyroxene displays normal zoning, with a high Mg-Cr rich diopside core (up to 1.92 wt%) and a Na 2 O, Al 2 O 3 , FeO, and TiO 2 -enriched salite rim. These chemical variations, along with elemental substitutions from core to rim, indicate the significant role of fractionation in the evolution of lamprophyre magma. The lack of chemical disparity among the studied Cpx, suggests closed-system fractionation, under high oxygen fugacity conditions. Thermobarometry results indicate polybaric crystallization for the Cpx (1206–1269 °C, 11.82–18.04 kbar) and biotite (825–856 °C, 3.49–6.94 kbar). The gradient inferred from the pressure of the Cpx suggests that its crystallization occurred at a depth of 43-66 km, implying shallow lithospheric magma contribution for the genesis of the lamprophyre magma. Supplementary material at https://doi.org/10.6084/m9.figshare.c.7249493

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Lithosphere structure beneath the eastern Dharwar craton kimberlite field, India, inferred from joint inversion of surface wave dispersion and receiver function data

Cited by 3 publications

References 90 publications

Cryptic Magma Chamber in the Deccan Traps Imaged Using Receiver Functions and Surface Wave Dispersion

Cryptic Magma Chamber in the Deccan Traps Imaged Using Receiver Functions and Surface Wave Dispersion

Internal structure of India: perspectives from a review of the seismological imaging studies from 2020 to 2023

Mineral chemistry of chrome-diopside bearing lamprophyre from Mesoproterozoic Settupalle igneous complex of Prakasam alkaline province: insights on the magma dynamics at shallow lithospheric mantle beneath the NE margin of the Cuddapah basin, Southern India

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