![]() ![]() ![]() ![]() Including fracture zones, extinct ridges, V-anomalies, discordant zones, We explore these challenges and their implications for our understanding of the India-Asia collision and continental collisions in general.Marine geology and plate tectonics native to MICRODEM. These include our understanding of suture zones, and the limits of continental subduction. No single model is entirely satisfactory and each invokes assumptions that challenge accepted concepts. We integrate these reconstructions and subduction zone configurations in a plate kinematic framework to test their validity for the India-Asia collision. This subduction zone configuration allows for three reconstructions for Greater India: The (1) minimum-area (2) enlarged-area and (3) Greater India Basin reconstructions. At that time, a second may have been active at subequatorial latitudes, but support for this from a bedrock perspective is lacking. At the onset of the India-Asia collision at 59 ± 1 Ma, one subduction zone was active along the southern Asian continental margin at ~20°N. Neotethys was consumed by at least two subduction zones since the Jurassic. ![]() Integrating this with bedrock constraints allows us to constrain post-Triassic subduction zone configurations for the central Tethys oceans. Following the assumption that slabs sink vertically through the mantle, their positions and geometries determined from seismic tomography constrain the locations and kinematics of paleo-subduction zones. To accomplish this, we review: (1) the post-Triassic bedrock record of subduction in Tibet (2) seismic tomographic imaging of subducted slabs in the mantle (3) timing of the India-Asia collision and (4) the pre-collisional size of Greater India. In this study, we integrate bedrock datasets, observations of subducted slabs in the mantle, and plate kinematic constraints to constrain models for the India-Asia collision and the central Tethys oceans. ![]()
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January 2023
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