The Amirante Ridge and Trench System in the Indian Ocean: the southern termination of the NW Indian subduction

Rodriguez, Mathieu

doi:10.5802/crgeos.40

Cited by 6 publications

(3 citation statements)

References 78 publications

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“…Why did this slab pull decrease suddenly or become non-existent at the end of Deccan episode? Many previous studies have proposed for an intraoceanic subduction system to have initiated at the Deccan episode owing to the Reunion plume (Jagoutz et al 2016, Gnos et al 1998, Rodriguez et al 2019, 2020,Pandey et al 2019, Gaina et al 2015. However, despite the extensive research that has been conducted, there have been no successful candidates so far.…”

Section: Forces Related To Subductionmentioning

confidence: 99%

“…2. Amirante Trench system (Rodriguez et al 2019, 2020, Plummer 1996. However, as interesting it may appear, we are left to wonder if the subduction initiated at ~70 Ma then why did the change in course occur at C29r and that too for a very short time spanning ~700-800 ka.…”

Section: Forces Related To Subductionmentioning

confidence: 99%

“…3. Laxmi Basin Fore Arc sequence (Pandey et al 2019)Rodriguez et al (2020) hypothesized that the Reunion plume in its pre-Deccan state at ~90-100 Ma formed an arcuate subduction system that broke into 3 distinct limbs, viz., The Northern, North-western and Southern limbs. Of these the North-western branch drifted off to form the Troodos and Semail ophiolites, the northern branch drifted to form subduction systems resulting in the formation of ophiolites along the Indus suture zone; and the Southern branch drifted southward along the NW frontier of India to form the string of ophiolites scattered along Bela-Waziristan-Muslim Bagh-Kabul ophiolite belt.…”

mentioning

confidence: 99%

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Impact of Deccan Volcanism on Reorganization of the Indian plate kinematics

Bhagat¹,

Sangode²,

Dongre³

2022

Preprint

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Western Indian Ocean basin shows one of the most complex signatures of the ocean floor anomalies by juxtaposition of the rapidly evolving, multiple spreading ridges, subduction systems and microcontinental slivers. This study based on ocean floor magnetic anomalies, gravity gradient map, tomographic profiles and geometrical kinematic models reports a significant westward drift of the Central Indian Ridge (CIR) segments. Documented precisely between the latitudes 17°S and 21°S the drift is coincident with the Deccan volcanism at ~65±2 Ma and we further explain its bearing on the Indian plate kinematics. The progressive stair-step trend of the ridge segments towards NE is marked by anomalous deflection to NW for a brief distance of ~217 km between these latitudes represented by the anomalies C30n-C29n. The observed length of the ridge segments moving NW at 17°S match the calculated NW drift rates of Indian plate (Bhagat et al., 2022). We infer that the NW drift and its restoration towards NE triggered short Plume Induced Subduction Initiation along the Amirante trench. Further a plume induced lithospheric tilt of the Indian plate (Sangode et al 2022) led to restoration of subduction along the Sunda trench at ~65 Ma imparting new slab pull force over the Indian subcontinent besides the NE trend for CIR. This episode resulted into anticlockwise rotation of the Indian plate along with accelerated drift rates due to vector addition of the plume push and the slab pull forces from Eurasian as well as Sunda subduction systems after 65 Ma. The Deccan eruption thus resulted in major geodynamic reorganization that altered the kinematics of Indian plate; and the signatures of which are well preserved over the ocean floor.

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