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Rift-Induced Repositioning of Mantle Plumes Beneath the Indian Lithosphere: Implications for Deccan Volcanism
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J
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DOI：10.1029/2025JB033633.png)
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Abstract
En 中文
The rift system in Indian craton underwent reactivation at the Cretaceous-Tertiary boundary when the R & eacute;union plume encountered the Indian lithosphere, leading to the 66 Ma massive Deccan volcanism. Although the plume-driven rift tectonics is a subject of lively research, how a pre-existing rift system can modulate the plume dynamics, particularly in continental settings has remained inadequately explored. The present study addresses this issue in the framework of the R & eacute;union plume-Indian lithosphere geodynamics. We develop 2D thermomechanical models to simulate plume-rift interactions, systematically investigating the modes of interactions as a function of plate's pull velocity (V-p) and plume-rift distance (delta). Our numerical experiments reveal that small delta (<200 km) or high V-p (>1 cm/yr) conditions redirect a large portion of the plume materials toward the pre-existing rift, resulting in significant melting beneath the rift undergoing rejuvenation. Increasing delta or decreasing V-p weakens the plume-rift interaction, leaving the pre-existing rift zone almost passive, and stagnation of the plume materials with little melting. The model results suggest that the Narmada rift, which was closer to the R & eacute;union plume, significantly deflected the plume materials, leading to partial melting with Moho upwarping and profuse magmatism. In contrast, the Godavari rift, located at a larger distance from the plume behaved passively, allowing the plume materials to stagnate with little melting at the lithospheric base and facilitate Moho downwarping, as supported by geophysical observations. This article provides a new insight of the differential responses of the Indian rift system to the R & eacute;union event.
Keywords:
R & eacute
union plume
Indian paleo-rift reactivation
plume-lithosphere interactions
partial melting
Journal
J
IF:
4.1
Papers:
182
Citations:
0
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