Structure of the deep lithosphere between Pamir and Tarim

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Wasja Bloch, Bernd Schurr , Xiaohui Yuan , Lothar Ratschbacher , Sanaa Reuter , Sofia‑Katerina Kufner , Qiang Xu , Junmeng Zhao


The Pamir orogen protrudes $\sim$300-km between the Tajik and Tarim lithosphere
of central Asia. It is debated, whether its salient location and shape is
controlled by indentation of a promontory of Indian mantle lithosphere or
by rollback of thinned Tarim--Tajik-basin lithosphere. We present
a new local-seismicity and focal-mechanism catalog and a P-wave velocity
model of the previously poorly illuminated eastern Pamir and western Tarim
lithosphere. The Wadati-Benioff earthquake zone that marks the arc-shaped
Asian slab appears overturned in the eastern Pamir. In front of the Asian
slab, another zone of weak earthquakes contours the western Kunlun, now
accurately located to be interpreted in a local context. The
seismic velocity structure guides our interpretation of this zone as
a slice of eclogitizing Pamir plateau crust that lines a compressive
transform zone boundary between a sub-crustal indenter and the Tarim block
and favours an indentation- over a rollback-scenario.



Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics, Tectonics and Structure


India, Asia, Pamir, Tarim


Published: 2021-04-14 11:43

Last Updated: 2021-04-22 04:10

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CC BY Attribution 4.0 International

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