气候变化领域集成服务门户(CCPortal): Low-Velocity Zones and Negative Radial Anisotropy Beneath the Plume Perturbed Northwestern Deccan Volcanic Province

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DOI	10.1029/2020JB020295
	Low-Velocity Zones and Negative Radial Anisotropy Beneath the Plume Perturbed Northwestern Deccan Volcanic Province
	Sharma J.; Kumar M.R.; Roy K.S.; Pal S.K.; Roy P.N.S.
发表日期	2021
ISSN	21699313
卷号	126 期号:2
英文摘要	The Deccan volcanic province (DVP) witnessed a massive outpouring of flood basalts of ∼2 million km3 volume, at ∼65 Ma, in less than a Myr. The volcanic eruption is concomitant with crustal extension, lithospheric thinning and magma influx beneath the major rift systems namely Cambay, Narmada, and Kutch. In this study, we investigate the anisotropic and isotropic variations within the crust and upper mantle beneath the northwestern DVP by estimating the shear wave velocity (VSV, VSH, and VSoigt) and radial anisotropy (ξoigt) models using the Surface Wave Tomography technique. A joint inversion of the regionalized Rayleigh and Love wave group velocities is performed, using the genetic algorithm approach. Our results reveal different intracrustal layers, lid, and a low-velocity zone (LVZ). This LVZ comprises of a uniform asthenospheric low-velocity layer (LVL) of average VSV 4.44 km/s and VSH 4.47 km/s, and another LVL below, of average VSV 4.45 km/s and VSH 4.41 km/s. Furthermore, the LVZ represents a negative anomaly with reference to different global models (AK135, STW105, PREM, and S2.9EA). A negative ξoigt is observed in the LVZ, indicating dominance of vertical flow. This could be related to presence of partials melts, volatile materials and/or a thermal anomaly. We also identified the Moho (∼34–40 km) and lithosphere-asthenosphere boundary (∼84–123 km). The low VS values, negative ξoigt and a thin lithosphere (∼84 km) in the vicinity of Gulf of Cambay affirm the presence of a plume head beneath it, in concurrence with the hypothesis of Indian Plate-Reunion plume interaction. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Deccan volcanic province; low-velocity zone; plume-lithosphere interaction; radial anisotropy; shear wave velocity
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187377
作者单位	Solid Earth Geophysics, Near Real Time Seismology Divisions, Institute of Seismological Research, Gandhinagar, Gujarat, India; Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India; Seismology Division, CSIR-National Geophysical Research Institute, Hyderabad, Telangana, India; Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, West Bengal, India
推荐引用方式 GB/T 7714	Sharma J.,Kumar M.R.,Roy K.S.,et al. Low-Velocity Zones and Negative Radial Anisotropy Beneath the Plume Perturbed Northwestern Deccan Volcanic Province[J],2021,126(2).
APA	Sharma J.,Kumar M.R.,Roy K.S.,Pal S.K.,&Roy P.N.S..(2021).Low-Velocity Zones and Negative Radial Anisotropy Beneath the Plume Perturbed Northwestern Deccan Volcanic Province.Journal of Geophysical Research: Solid Earth,126(2).
MLA	Sharma J.,et al."Low-Velocity Zones and Negative Radial Anisotropy Beneath the Plume Perturbed Northwestern Deccan Volcanic Province".Journal of Geophysical Research: Solid Earth 126.2(2021).