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Structure of Modern Oceanic Crust and Ophiolites and Implications for Faulting and Magmatism at Oceanic Spreading Centers. ACTA ACUST UNITED AC 2013. [DOI: 10.1029/gm106p0219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Larter RD, Vanneste LE, Morris P, Smythe DK. Structure and tectonic evolution of the South Sandwich arc. ACTA ACUST UNITED AC 2003. [DOI: 10.1144/gsl.sp.2003.219.01.13] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AbstractDetailed analysis of marine magnetic profiles from the western part of the East Scotia Sea confirms continuous, organized back-arc spreading since at least 15 Ma ago. In the eastern part of the East Scotia Sea, the South Sandwich arc lies on crust that formed at the back-arc spreading centre since 10 Ma ago, so older back-arc crust forms the basement of the present inner forearc. Interpretations of two multichannel seismic reflection profiles reveal the main structural components of the arc at shallow depth, including evidence of trench-normal extension in the mid-forearc, and other features consistent with ongoing subduction erosion. The seismic profile interpretations have been used to constrain simple two-dimensional gravity models. The models were designed to provide constraints on the maximum possible thickness of the arc crust, and it is concluded that this is 20 and 19.2 km on the northern and southern lines, respectively. On the northern line the models indicate that the forearc crust cannot be much thicker than normal oceanic crust. Even with such thin crust, however, the magmatic growth rate implied by the cross-section of the arc crust is within the range recently estimated for two other arcs that have been built over a much longer interval.
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Affiliation(s)
- Robert D. Larter
- British Antarctic Survey
High Cross, Madingley Road, Cambridge CB3 0ET, UK
| | - Lieve E. Vanneste
- British Antarctic Survey
High Cross, Madingley Road, Cambridge CB3 0ET, UK
| | - Peter Morris
- British Antarctic Survey
High Cross, Madingley Road, Cambridge CB3 0ET, UK
| | - David K. Smythe
- Department of Geology and Applied Geology, University of Glasgow
UK
- GeoLogica Ltd
191 Wilton Street, Glasgow G20 6DF, UK
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Martínez F, Fryer P, Becker N. Geophysical characteristics of the southern Mariana Trough, 11°50′N-13°40′N. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/2000jb900117] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Dilek Y, Thy P. Structure, petrology and seafloor spreading tectonics of the Kizildag Ophiolite, Turkey. ACTA ACUST UNITED AC 1998. [DOI: 10.1144/gsl.sp.1998.148.01.04] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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