Inconsistent correlation of seismic layer 2a and lava layer thickness in oceanic crust

Gail L. Christeson (), Kirk D. McIntosh and Jeffrey A. Karson
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Gail L. Christeson: University of Texas Institute for Geophysics, Jackson School of Geosciences
Kirk D. McIntosh: University of Texas Institute for Geophysics, Jackson School of Geosciences
Jeffrey A. Karson: Syracuse University

Nature, 2007, vol. 445, issue 7126, 418-421

Abstract: Ocean crust formation The oceanic crust makes up two thirds of the Earth's surface and has been studied for many years, yet the processes by which it is formed are still not fully understood. One problem is inaccessibility: only a tiny fraction of it has been subjected to drilling and sampling (the tools of geology), so much relies on remote sensing techniques such as seismic exploration (the tools of geophysics). These two approaches have led to some confusion over crustal structure. Christeson et al. set out to reconcile the two by a direct comparison between seismic interpretations and geologic mapping. The new data question the idea that seismic layer 2A correlates with lava layer thickness. Instead the layer 2A reflection seems to correspond to an alteration boundary within the lava layer.

Date: 2007
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DOI: 10.1038/nature05517

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