Segmentation and melt supply at the Southwest Indian Ridge

Abstract

Research Article| October 01, 1999 Segmentation and melt supply at the Southwest Indian Ridge Mark R. Muller; Mark R. Muller 1Bullard Laboratories, University of Cambridge, Madingley Road, Cambridge CB3 0EZ, UK Search for other works by this author on: GSW Google Scholar Timothy A. Minshull; Timothy A. Minshull 1Bullard Laboratories, University of Cambridge, Madingley Road, Cambridge CB3 0EZ, UK Search for other works by this author on: GSW Google Scholar Robert S. White Robert S. White 1Bullard Laboratories, University of Cambridge, Madingley Road, Cambridge CB3 0EZ, UK Search for other works by this author on: GSW Google Scholar Author and Article Information Mark R. Muller 1Bullard Laboratories, University of Cambridge, Madingley Road, Cambridge CB3 0EZ, UK Timothy A. Minshull 1Bullard Laboratories, University of Cambridge, Madingley Road, Cambridge CB3 0EZ, UK Robert S. White 1Bullard Laboratories, University of Cambridge, Madingley Road, Cambridge CB3 0EZ, UK Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1999) 27 (10): 867–870. https://doi.org/10.1130/0091-7613(1999)027<0867:SAMSAT>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Mark R. Muller, Timothy A. Minshull, Robert S. White; Segmentation and melt supply at the Southwest Indian Ridge. Geology 1999;; 27 (10): 867–870. doi: https://doi.org/10.1130/0091-7613(1999)027<0867:SAMSAT>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The segmentation of mid-ocean ridge axes and its variation with spreading rate provide constraints on models of mantle upwelling and the supply of basaltic melt to the crust. We present seismic refraction results from three segments of the very slow spreading Southwest Indian Ridge. From the absence of oceanic layer 3 beneath segment boundaries, and from significant variations in maximum crustal thickness between segments, we infer that melt generation and/or delivery is focused at segment midpoints and varies between segments. Anomalously thin crust—2.0–2.5 km beneath the nontransform segment boundaries and 3.5–6.0 km beneath the segment mid-points—is caused by restricted melt generation resulting from conductive heat loss from the upwelling mantle under the spreading center. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.