Subsurface tectonic structure between overlapping mid-ocean ridge segments.

Tong, C. H. and Lana, C. and White, R. S. and Warner, M. R. and Group, Arad Working (2005) Subsurface tectonic structure between overlapping mid-ocean ridge segments. Geology, 33. pp. 409-412. DOI 10.1130/G21245.1

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Abstract

Our results from seismic anisotropy analyses reveal for the first time the complex spatial variability of the characteristics of subsurface tectonic structures associated with ridge propagation. The significance lies in the fact that these variations are found at a locality with few lineaments or fissures at seafloor level. The overlap region between mid-ocean ridge segments at 98N on the East Pacific Rise is characterized by aligned cracks that are structurally more closely related to the propagating-ridge segment. These aligned cracks, which are approximately parallel to the ridge segments, provide conclusive observational evidence for establishing the nontransform nature of overlapping spreading centers, especially those with overlap basins covered by volcanic edifices. The aligned cracks of the 98039N overlapping spreading center are more similar to the ridge-parallel lineaments observed between overlapping axial-summit collapse troughs than those found at larger overlapping spreading centers. Our results therefore suggest that the lithospheric deformation between overlapping ridge segments depends on ridge offset and that this dependency may be thermally related.

Item Type: Article
Uncontrolled Keywords: 2005 AREP 2005 P IA48
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Geology
Volume: 33
Page Range: pp. 409-412
Identification Number: 10.1130/G21245.1
Depositing User: Sarah Humbert
Date Deposited: 13 Aug 2010 11:18
Last Modified: 23 Jul 2013 09:59
URI: http://eprints.esc.cam.ac.uk/id/eprint/1845

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