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Detailed Reference Information |
Heinemann, J., Stock, J., Clayton, R., Hafner, K., Cande, S. and Raymond, C. (1999). Constraints on the proposed Marie Byrd Land-Bellingshausen plate boundary from seismic reflection data. Journal of Geophysical Research 104. doi: 10.1029/1998JB900079. issn: 0148-0227. |
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Single-channel and multichannel marine seismic data off the coast of West Antarctica collected during two Nathaniel B. Palmer cruises (NP92-8 and NP96-2) in the vicinity of 65 ¿S to 71 ¿S, 220 ¿E to 250 ¿E, reveal a NNW trending graben. We interpret this graben to be part of the paleodivergent plate boundary between the Marie Byrd Land and Bellingshausen plates. This graben coincides with a -520 nT magnetic anomaly to the NNW and a -720 nT anomaly to the SSE, as well as a 20 mGal negative gravity anomaly. Seismic profiles subparallel to the graben (22 km/Ma half-spreading rate) reveal greater seafloor roughness to the NE, where seafloor spreading was slower, than to the SW (27 km/Ma half-spreading rate). These data allow the position of the Marie Byrd Land-Bellingshausen plate boundary to be constrained more precisely than has previously been possible, with a trend of N17 ¿W from 68.52 ¿S, 233.65 ¿E to 68.41 ¿S, 233.56 ¿E. The sediment-filled graben has normal separation of sedimentary layers varying from 740¿30 m to 580¿20 m imaged in seafloor of age A33y (74 Ma). ¿ 1999 American Geophysical Union |
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Abstract |
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Keywords
Tectonophysics, Plate motions—past, Marine Geology and Geophysics, Plate tectonics, Exploration Geophysics, Seismic methods, Marine Geology and Geophysics, Marine seismics |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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