Deep crustal structure of the Adare and Northern Basins, Ross Sea, Antarctica, from sonobuoy data

TitleDeep crustal structure of the Adare and Northern Basins, Ross Sea, Antarctica, from sonobuoy data
Publication TypeJournal Article
Year of Publication2014
AuthorsSelvans M.M, Stock JM, Clayton R.W, Cande S., Granot R
JournalEarth and Planetary Science Letters
Volume405
Pagination220-230
Date Published2014/11
Type of ArticleArticle
ISBN Number0012-821X
Accession NumberWOS:000343625500019
KeywordsAdare Basin; crustal structure; fracture-zone; margin; marie-byrd-land; marine seismic data; motion; Northern Basin; pacific; sonobuoy; southwest indian ridge; svalbard; transect; velocity; West Antarctic Rift System; west antarctica
Abstract

Extension associated with ultraslow seafloor spreading within the Adare Basin, in oceanic crust just north of the continental shelf in the Ross Sea, Antarctica, extended south into the Northern Basin. Magnetic and gravity anomaly data suggest continuity of crustal structure across the continental shelf break that separates the Adare and Northern Basins. We use sonobuoy refraction data and multi-channel seismic (MCS) reflection data collected during research cruise NBP0701, including 71 new sonobuoy records, to provide constraints on crustal structure in the Adare and Northern Basins. Adjacent 1D sonobuoy profiles along several MCS lines reveal deep crustal structure in the vicinity of the continental shelf break, and agree with additional sonobuoy data that document fast crustal velocities (6000-8000 m/s) at shallow depths (1-6 km below sea level) from the Adare Basin to the continental shelf, a structure consistent with that of other ultraslow-spread crust. Our determination of crustal structure in the Northern Basin only extends through sedimentary rock to the basement rock, and so cannot help to distinguish between different hypotheses for formation of the basin. (C) 2014 Elsevier B.V. All rights reserved.

DOI10.1016/j.epsl.2014.08.029
Short TitleEarth Planet. Sci. Lett.
Integrated Research Themes: 
Student Publication: 
No