Unperturbed Archean lithosphere beneath the Eastern Dharwar Craton Kimberlite Field, India: inferred from joint inversion of surface wave dispersion and receiver function data

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

doi:10.1002/essoar.10512636.1

Cited by 2 publications

(3 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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.…”

Section: Discussionmentioning

confidence: 52%

“…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: 76%

See 1 more Smart Citation

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

Saha,

Kumar,

Chaubey

et al. 2023

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionmentioning

confidence: 52%

Section: Velocity‐depth Section Mappingmentioning

confidence: 76%

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

Saha,

Kumar,

Chaubey

et al. 2023

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

show abstract

“…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;Shukla et al, 2022). An ensemble of velocity models (Figure 3a) of the DVP along the profile, compared with the Dharwar craton (Borah et al, 2014;Chaubey et al, 2022), suggests significant differences between the crustal properties: a lower velocity at a depth of 8-17 km and a higher velocity at 4-8 km below the seismic profile in the DVP. We observe a laterally variable underplated basal layer (Vs >4.0 km/s) in the lower crust.…”

Section: Discussionmentioning

confidence: 99%

Cryptic Magma Chamber in the Deccan Traps imaged using receiver function

Saha

Kumar

Chaubey

et al. 2022

Preprint

View full text Add to dashboard Cite

We present the first evidence for a lower S-wave velocity (Vs ~3.3 to 3.5 km/s) at 8-17 km depth underlying a 4 km thick high-velocity zone with Vs >3.8 km/s beneath the west coast and the neighbouring parts of the Deccan Volcanic Province, India, coinciding with the last phase of volcanism. The velocity structure is derived from joint inversion of receiver function from 9 seismographs operated along ~106 km long W-E profile with the surface wave dispersion data. The low-velocity layer possibly represents the horizontally elongated frozen magma reservoir, the source for the magma eruption at ~65 million years produced due to the interaction of the Reunion hotspot 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 underplating as a consequence of magma upwelling.

show abstract

Unperturbed Archean lithosphere beneath the Eastern Dharwar Craton Kimberlite Field, India: inferred from joint inversion of surface wave dispersion and receiver function data

Cited by 2 publications

References 60 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

Cryptic Magma Chamber in the Deccan Traps imaged using receiver function

Contact Info

Product

Resources

About