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dc.contributor.advisor Anderson, John B.
dc.creatorJeffers, John Douglas
dc.date.accessioned 2009-06-04T00:29:29Z
dc.date.available 2009-06-04T00:29:29Z
dc.date.issued 1988
dc.identifier.urihttps://hdl.handle.net/1911/13297
dc.description.abstract Application of sequence stratigraphy to seismic reflection profiles from the Bransfield Basin indicates that this modern back-arc basin formed in response to cessation of subduction at the South Shetland trench at 4 Ma. Two distinct systems tracts stack to form depositional sequences; hemipelagic sediments drape the basin during highstand/interglacial periods, whereas glacially-eroded sediments prograde into the basin during lowstand/glacial maxima. Relative ages of back-arc and forearc sequences suggest that forearc subsidence due to subduction cessation predated back-arc rifting. Since glacial fluctuations in the region are controlled primarily by sea level, the Bransfield Basin sequences may correlate with global eustatic cycles; subsidence rates and sediment thicknesses suggest that they are of $\sim$0.8 Ma duration. If so, the forearc started subsiding by 3.1 Ma, a rifted back-arc margin existed by 2.4 Ma, and basin floor volcanism began before 1.6 Ma. Tectonic segmentation of the back-arc reflects the continuing influence of the formerly active South Shetland subduction zone.
dc.format.extent 158 p.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subjectGeology
dc.title Tectonic and sedimentary evolution of the Bransfield Basin, Antarctica
dc.type.genre Thesis
dc.type.material Text
thesis.degree.department Earth Science
thesis.degree.discipline Natural Sciences
thesis.degree.grantor Rice University
thesis.degree.level Masters
thesis.degree.name Master of Arts
dc.identifier.citation Jeffers, John Douglas. "Tectonic and sedimentary evolution of the Bransfield Basin, Antarctica." (1988) Master’s Thesis, Rice University. https://hdl.handle.net/1911/13297.


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