A tectonic model reconciling evidence for the collisions between India, Eurasia and intra-oceanic arcs of the central-eastern Tethys

• Published in: Gondwana Research
• Main Authors: Gibbons, AD, Zahirovic, S, Muller, RD, Whittaker, JM, Yatheesh, V
• Format: Article in Journal/Newspaper
• Language: English
• Published: Int Assoc Gondwana Research 2015
• Subjects: Earth Sciences; Geophysics; Geodynamics; East Antarctica; Indian; Wharton; Antarc*; Antarctica
• Online Access: https://doi.org/10.1016/j.gr.2015.01.001; http://ecite.utas.edu.au/98317

Despite several decades of investigations, inferences on the timing and nature of collisions along the MesozoicCenozoic Eurasian margin remain controversial. We assimilate geological and geophysical evidence into a plate tectonic model for the IndiaEurasia collision that includes continuously-closing topological plate polygons, constructed from a time-dependent network of evolving plate boundaries, with synthetic plates constructed for now-subducted ocean floor, including back-arc basins that formed on the southern Eurasian margin. Our model is regionally-constrained and self-consistent, incorporating geophysical data from abyssal plains offshore West Australia and East Antarctica, including Jurassic age data from offshore Northwest Australia, limiting much of northern Greater India to a ~1000km-long indenter, originally reaching to the WallabyZenith Fracture Zone. Southern Eurasia and Southeast Asia are riddled with dismembered oceanic arcs indicating long-lived Tethyan intra-oceanic subduction. This intra-oceanic subduction system was well-established from Cretaceous time in the IndiaEurasia convergence zone in the NeoTethys, which was consumed during Greater India's northward trajectory towards Eurasia from the Early Cretaceous. Fragments of obducted oceanic crust within the Yarlung-Tsangpo Suture Zone, between India and Eurasia, predominantly date to the Late Jurassic or mid Cretaceous (BarremianAptian). The various ophiolites along strike and a hiatus in subduction-related magmatism during the TithonianAptian suggest that there was at least one generation of intra-oceanic arc formation, whose plate boundary configuration remains uncertain. Paleomagnetic and magmatic studies suggest that the intra-oceanic arc was at equatorial latitudes during the Early Cretaceous before subduction resumed further north beneath the Eurasian margin (Lhasa terrane), with another hiatus in subduction-related magmatism along southern Lhasa during ~8065Ma, possibly as the back-arc spreading centre approached the active Andean-style margin. In our model, Greater India collided with the Tethyan intra-oceanic arc in PaleoceneEocene time, finally closing the Tethyan seaway from Mid-Late Eocene time, which is consistent with the age of the youngest marine deposits found between India and Eurasia. Geological evidence from the collision zone indicates an age of initial arccontinent collision by ~52Ma, followed by the soft (initial) continentcontinent collision between India and Eurasia by ~442Ma. This timing is supported by marine geophysical data, where the spreading centres in the Indian Ocean record a drastic decline in seafloor spreading rates and changes in spreading directions first at ~52Ma, followed by another reorganisation at ~43Ma. The abandonment of spreading in the Wharton Basin and the onset of extrusion tectonics in Asia by ~36Ma are likely indicators of hard (complete) continent collision, and highlight the multi-stage collisional history of this margin. Our continuously evolving network of mid-ocean ridge and subduction zone geometries, and divergence/convergence vectors through time, provide a basis for future refinements to assimilate new data and/or test alternative tectonic scenarios.