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Journal Article

Tearing of the mantle lithosphere along the intermediate-depth seismicity zone beneath the Gibraltar Arc: The onset of lithospheric delamination

Authors
/persons/resource/heit

Heit,  B.
2.4 Seismology, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Mancilla,  Flor de Lis
External Organizations;

/persons/resource/yuan

Yuan,  Xiaohui
2.4 Seismology, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Morales,  Jose
External Organizations;

/persons/resource/dstichs

Stichs,  Daniel
1.4 Remote Sensing, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Martin,  Rosa
External Organizations;

Molina-Aguilera,  Antonio
External Organizations;

, 

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2408903.pdf
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Citation

Heit, B., Mancilla, F. d. L., Yuan, X., Morales, J., Stichs, D., Martin, R., Molina-Aguilera, A. (2017): Tearing of the mantle lithosphere along the intermediate-depth seismicity zone beneath the Gibraltar Arc: The onset of lithospheric delamination. - Geophysical Research Letters, 44, 9, 4027-4035.
https://doi.org/10.1002/2017GL073358


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_2408903
Abstract
The intermediate-depth seismicity (IDS) beneath the Gibraltar Arc is enigmatic. So far, there is no general consensus on its relationship with the ongoing tectonic processes. We analyzed S wave receiver functions (SRFs) with data recorded by a dense N-S seismic profile deployed across the Sierra Nevada in southern Spain. SRF piercing points at depths of the lithosphere-asthenosphere boundary (LAB) sample an area of the IDS zone, providing an ideal opportunity to study the lithospheric structure at the IDS zone. We observe an abrupt change in the LAB depth along a profile from north to south across the northern branch of the IDS. The LAB depth changes from 90 to 100 km north of the IDS to ~130 km south of it. We propose that the IDS marks a tear in the Iberian mantle lithosphere along its entire length, implying an ongoing lithospheric delamination process that produces the seismicity at its onset.