Foundered lithospheric segments dropped into the mantle transition zone beneath southern California, USA

Youqiang Yu, Stephen S. Gao, Kelly H. Liu, Dapeng Zhao

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The diverse range of active tectonics occurring in southern California, USA, offers an opportunity to explore processes of continental deformation and modification in response to the instability of the Pacific and Farallon plates. Here, we present a high-resolution receiverfunction image of the mantle transition zone (MTZ). Our result reveals significant lateral heterogeneities in the deep mantle beneath southern California. Both seismic tomography and MTZ discontinuity deflections reveal foundered lithospheric segments that have dropped into the MTZ beneath the western Transverse Ranges, the Peninsular Ranges, and part of the southern Sierra Nevada. Water dehydrated from these foundered materials may contribute to the observed MTZ thickening. Our observations, combined with previous tomography and geochemical results, indicate that lithospheric foundering of fossil arc roots provides a way for geochemical heterogeneities to be recycled into the underlying mantle, and suggest that the foundered materials can play a significant role in inducing lateral variations of MTZ structure.

Original languageEnglish
Pages (from-to)200-204
Number of pages5
JournalGeology
Volume48
Issue number2
DOIs
Publication statusPublished - 2020 Feb 1

ASJC Scopus subject areas

  • Geology

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