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Eruptive hummocks: Building blocks of the upper ocean crust

2011; Geological Society of America; Volume: 40; Issue: 1 Linguagem: Inglês

10.1130/g31892.1

1943-2682

Isobel Yeo, R. C. Searle, K. L. Achenbach, T. P. Le Bas, Bramley J. Murton,

Geological formations and processes

Research Article| January 01, 2012 Eruptive hummocks: Building blocks of the upper ocean crust Isobel Yeo; Isobel Yeo * 1Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK *E-mail: i.a.yeo@durham.ac.uk. Search for other works by this author on: GSW Google Scholar Roger C. Searle; Roger C. Searle 1Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK Search for other works by this author on: GSW Google Scholar Kay L. Achenbach; Kay L. Achenbach 1Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK Search for other works by this author on: GSW Google Scholar Tim P. Le Bas; Tim P. Le Bas 2National Oceanography Centre, Empress Dock, Southampton SO14 3ZH, UK Search for other works by this author on: GSW Google Scholar Bramley J. Murton Bramley J. Murton 2National Oceanography Centre, Empress Dock, Southampton SO14 3ZH, UK Search for other works by this author on: GSW Google Scholar Author and Article Information Isobel Yeo * 1Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK Roger C. Searle 1Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK Kay L. Achenbach 1Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK Tim P. Le Bas 2National Oceanography Centre, Empress Dock, Southampton SO14 3ZH, UK Bramley J. Murton 2National Oceanography Centre, Empress Dock, Southampton SO14 3ZH, UK *E-mail: i.a.yeo@durham.ac.uk. Publisher: Geological Society of America Received: 27 Oct 2010 Revision Received: 25 Aug 2011 Accepted: 02 Sep 2011 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2012 Geological Society of America Geology (2012) 40 (1): 91–94. https://doi.org/10.1130/G31892.1 Article history Received: 27 Oct 2010 Revision Received: 25 Aug 2011 Accepted: 02 Sep 2011 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Isobel Yeo, Roger C. Searle, Kay L. Achenbach, Tim P. Le Bas, Bramley J. Murton; Eruptive hummocks: Building blocks of the upper ocean crust. Geology 2012;; 40 (1): 91–94. doi: https://doi.org/10.1130/G31892.1 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 spreading axis at many slow-spreading mid-ocean ridges is marked by an axial volcanic ridge. In this study, we use a combination of high-resolution remote sensing methods to elucidate the detailed nature of volcanoes in such a ridge. We find that the "hummocks" described in previous sidescan sonar studies are dome- or cone-shaped edifices, 5–150 m high with diameters of 30–330 m. We estimate they form quickly, in single eruptions, each of which may produce several hummocks. Hummock collapse is common and hummocks of all heights are prone to failure. Collapses generally occur down the regional seafloor slope, suggesting control by local topography. Approximately 33% of hummocks lose ∼40% of their volume by collapse, so ∼12% of all material erupted on the axial volcanic ridge is rapidly converted to talus. The higher porosity of these deposits may increase average upper crustal porosity by several percent, contributing >0.5 km s−1 to seismic velocity decrease in the upper oceanic crust, and may be one of the dominant mechanisms for increasing porosity in upper slow-spreading oceanic crust. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.