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The Crust was Strengthened or Weakened After Mantle Plume: Evidence from Tarim Basin

Description: 

Widely distributed early-Permian basalts and rhyolites in Tarim Basin were speculated as products of mantle plume, however the interaction between the mantle plume and the shallow cratonic lithosphere remains ambiguous. Here, we constrain the S-wave velocity structures to 15 km depth utilizing multi-frequency receiver function data from two temporary broadband seismic arrays in the Tarim Basin. There is a large-scale S-wave velocity discontinuity at bottom of Permian strata showing significant rising for the western basin, but without apparent undulations for eastern basin. Besides, massive high velocity anomalies at the western basin, spatially correlated with the previously proposed mantle plume head, suggest Permian plutonic intrusions in western basin. These intrusive heterogeneities may change the strength of the shallow crust and cause focused deformation under subsequent tectonic activities, leading to folding and faulting of strata in western basin during the Cenozoic. Our findings indicate that the activities of mantle plume may destroy the integrity of the craton by changing the composition distribution in the lithosphere.

Session: Earth’s Structure from the Crust to the Core [Poster Session]

Type: Poster

Date: 5/2/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Wentao

Student Presenter: Yes

Invited Presentation: 

Authors