Tearing of the mantle lithosphere along the intermediate‐depth seismicity zone beneath the Gibraltar Arc: The onset of lithospheric delamination. Issue 9 (4th May 2017)

• Record Type: Journal Article
• Authors: Heit, Benjamin; Mancilla, Flor de Lis; Yuan, Xiaohui; Morales, Jose; Stich, Daniel; Martín, Rosa; Molina‐Aguilera, Antonio
• Is Part Of: Geophysical research letters. Volume 44:Issue 9(2017)
• Page Start: 4027
• Page End: 4035
• Publication Date: 2017-05-04
• Subjects: lithospheric tear -- lithospheric delamination -- intermediate‐depth seismicity -- S receiver function; Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/2017GL073358
• Languages: English
• ISSNs: 0094-8276

Abstract

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. Key Points: Analysis of S receiver functions using data from a dense seismic profile across the Sierra Nevada Cordillera, southern Spain Detection of a 30 km step of the mantle lithosphere beneath the northern branch of the intermediate‐depth seismic zone Implication of tearing in the mantle lithosphere that has propagated along the entire length of the intermediate‐depth seismic zone