A three-dimensional study of a crustal low velocity region beneath the 9,3'N overlapping spreading center
Bazin, S. and Sinha, M.C. (2003) A three-dimensional study of a crustal low velocity region beneath the 9,3'N overlapping spreading center. Geophysical Research Letters, 30, (2), 1039-[4pp]. (doi:10.1029/2002GL015137)
Download
Full text not available from this repository.
Official URL: http://dx.doi.org/10.1029/2002GL015137
Description/Abstract
Overlapping spreading centers (OSCs) play a key role in models of magma distribution at fast spreading ridges. To investigate the relationship between ridge-axis discontinuities and magma supply, we conducted a three-dimensional seismic reflection and tomography experiment at the 9°03′N OSC along the East Pacific Rise. Tomographic analysis imaged a broad mid-crustal low velocity zone (LVZ) beneath parts of the overlapper and the associated overlap basin, demonstrating that it is magmatically robust. The complementary datasets reveal a complex storage and tapping of melt: the LVZ and melt sill at either end of the overlap basin are not simply centered beneath the rise crest but are skewed inwards. The subsequent focussing of the LVZ and sill beneath the axis of the eastern limb appears to be due to melt migration toward the tip. The OSC western limb is less magmatically robust and may be in the process of dying.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SPREADING CENTRES, SEISMIC REFLECTION, EAST PACIFIC RISE, TOMOGRAPHY, GEOLOGY |
| Related URLs: | http://dx.doi.org/10.1029/2002GL015137 |
| Subjects: | Q Science > QE Geology G Geography. Anthropology. Recreation > GC Oceanography |
| Divisions: | University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES) |
| ePrint ID: | 2227 |
| URI: | http://eprints.soton.ac.uk/id/eprint/2227 |
| Deposited On: | 20 May 2004 |
| Last Modified: | 02 Mar 2012 11:43 |
Associated Staff Only: edit my ePrint
