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Quasi-3D seismic reflection imaging, and wide-angle velocity structure of nearly amagmatic oceanic lithosphere at the ultra-slow spreading Southwest Indian Ridge ArchiMer
Momoh, Ekeabino; Cannat, Mathilde; Watremez, Louise; Leroy, Sylvie; Singh, Satish C..
We present results from 3D processing of 2D seismic data shot along 100 m-spaced profiles in a 1.8 km wide by 24 km long box during the SISMOSMOOTH 2014 cruise. The study is aimed at understanding the oceanic crust formed at an end-member mid-ocean ridge environment of nearly zero melt supply. Three distinct packages of reflectors are imaged: (1) south-facing reflectors which we propose correspond to the damage zone induced by the active axial detachment fault. Reflectors in the damage zone have dips up to 60° and are visible down to 5 km below the seafloor; (2) series of north-dipping reflectors in the hanging wall of the detachment fault. These reflectors may correspond to damage zone inherited from a previous, north-dipping detachment fault, or small...
Tipo: Text Palavras-chave: Amagmatic; Ultraslow mid-ocean ridge; 3-D seismic; Tomography; Detachment fault; Damage zone.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00411/52215/52943.pdf
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