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

Selvans, M. M. and Stock, J. M. and Clayton, R. W. and Cande, S. and Granot, R. (2014) Deep crustal structure of the Adare and Northern Basins, Ross Sea, Antarctica, from sonobuoy data. Earth and Planetary Science Letters, 405 . pp. 220-230. ISSN 0012-821X. http://resolver.caltech.edu/CaltechAUTHORS:20140926-090020854

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.epsl.2014.08.029DOIArticle
http://www.sciencedirect.com/science/article/pii/S0012821X14005354PublisherArticle
ORCID:
AuthorORCID
Stock, J. M.0000-0003-4816-7865
Clayton, R. W.0000-0003-3323-3508
Additional Information:© 2014 Elsevier B.V. Received 8 March 2014; Received in revised form 21 August 2014; Accepted 25 August 2014. We thank F. Davey for helpful discussions of sonobuoy data analysis and interpretation, and K.S. Panter and an anonymous re-viewer for suggestions that improved the figures in this manuscript. We also thank Captain Mike Watson, the crew, and the Raytheon Polar Services Corporation technical staff on board the Nathaniel B. Palmer. This study was supported by National Science Foun-dation grants OPP04-40959 (S. Cande) and OPP-0440923 and OPP-0944711 (J. Stock and R. Clayton).
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFOPP04-40959
NSFOPP-0440923
NSFOPP-0944711
Subject Keywords:West Antarctic Rift System; marine seismic data; crustal structure; sonobuoy; Adare Basin; Northern Basin
Record Number:CaltechAUTHORS:20140926-090020854
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140926-090020854
Official Citation:M.M. Selvans, J.M. Stock, R.W. Clayton, S. Cande, R. Granot, Deep crustal structure of the Adare and Northern Basins, Ross Sea, Antarctica, from sonobuoy data, Earth and Planetary Science Letters, Volume 405, 1 November 2014, Pages 220-230, ISSN 0012-821X, http://dx.doi.org/10.1016/j.epsl.2014.08.029. (http://www.sciencedirect.com/science/article/pii/S0012821X14005354)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50049
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:01 Oct 2014 16:08
Last Modified:31 Jan 2017 20:41

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