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Seismic evidence for a hydrothermal layer above the solid roof of the axial magma chamber at the southern East Pacific Rise

1999; Geological Society of America; Volume: 27; Issue: 3 Linguagem: Inglês

10.1130/0091-7613(1999)027 2.3.co;2

1943-2682

S. C. Singh, Jenny Collier, A. J. Harding, G. M. Kent, John A. Orcutt,

High-pressure geophysics and materials

Research Article| March 01, 1999 Seismic evidence for a hydrothermal layer above the solid roof of the axial magma chamber at the southern East Pacific Rise S. C. Singh; S. C. Singh 1Bullard Laboratories, University of Cambridge, Cambridge CB3 0EZ, UK Search for other works by this author on: GSW Google Scholar J. S. Collier; J. S. Collier 1Bullard Laboratories, University of Cambridge, Cambridge CB3 0EZ, UK Search for other works by this author on: GSW Google Scholar A. J. Harding; A. J. Harding 2Scripps Institution of Oceanography, Cecil and Ida Green Institute of Geophysics and Planetary Physics, La Jolla, California 92093-0225, USA Search for other works by this author on: GSW Google Scholar G. M. Kent; G. M. Kent 2Scripps Institution of Oceanography, Cecil and Ida Green Institute of Geophysics and Planetary Physics, La Jolla, California 92093-0225, USA Search for other works by this author on: GSW Google Scholar J. A. Orcutt J. A. Orcutt 2Scripps Institution of Oceanography, Cecil and Ida Green Institute of Geophysics and Planetary Physics, La Jolla, California 92093-0225, USA Search for other works by this author on: GSW Google Scholar Author and Article Information S. C. Singh 1Bullard Laboratories, University of Cambridge, Cambridge CB3 0EZ, UK J. S. Collier 1Bullard Laboratories, University of Cambridge, Cambridge CB3 0EZ, UK A. J. Harding 2Scripps Institution of Oceanography, Cecil and Ida Green Institute of Geophysics and Planetary Physics, La Jolla, California 92093-0225, USA G. M. Kent 2Scripps Institution of Oceanography, Cecil and Ida Green Institute of Geophysics and Planetary Physics, La Jolla, California 92093-0225, USA J. A. Orcutt 2Scripps Institution of Oceanography, Cecil and Ida Green Institute of Geophysics and Planetary Physics, La Jolla, California 92093-0225, USA 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 (3): 219–222. https://doi.org/10.1130/0091-7613(1999)027 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 Email Tools Icon Tools Get Permissions Search Site Citation S. C. Singh, J. S. Collier, A. J. Harding, G. M. Kent, J. A. Orcutt; Seismic evidence for a hydrothermal layer above the solid roof of the axial magma chamber at the southern East Pacific Rise. Geology 1999;; 27 (3): 219–222. doi: https://doi.org/10.1130/0091-7613(1999)027 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 A full-waveform inversion of two-ship, wide-aperture, seismic reflection data from a ridge-crest seismic line at the southern East Pacific Rise indicates that the axial magma chamber here is about 50 m thick, is embedded within a solid roof, and has a solid floor. The 50–60-m-thick roof is overlain by a 150–200-m-thick low-velocity zone that may correspond to a fracture zone that hosts the hydrothermal circulation, and the roof itself may be the transition zone separating the magma chamber from circulating fluids. Furthermore, enhanced hydrothermal activity at the sea floor seems to be associated with a fresh supply of magma in the crust from the mantle. The presence of the solid floor indicates that at least the upper gabbros of the oceanic lower crust are formed by cooling and crystallization of melt in magma chambers. 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.