Effects of variable magma supply on mid-ocean ridge eruptions : constraints from mapped lava flow fields along the Galápagos Spreading Center


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dc.contributor.author Colman, Alice
dc.contributor.author Sinton, John M.
dc.contributor.author White, Scott M.
dc.contributor.author McClinton, J. Timothy
dc.contributor.author Bowles, Julie A.
dc.contributor.author Rubin, Kenneth H.
dc.contributor.author Behn, Mark D.
dc.contributor.author Cushman, Buffy
dc.contributor.author Eason, Deborah E.
dc.contributor.author Gregg, Tracy K. P.
dc.contributor.author Gronvold, Karl
dc.contributor.author Hidalgo, Silvana
dc.contributor.author Howell, Julia
dc.contributor.author Neill, Owen
dc.contributor.author Russo, Chris
dc.date.accessioned 2012-10-11T20:20:57Z
dc.date.available 2013-02-25T09:46:38Z
dc.date.issued 2012-08-25
dc.identifier.citation Geochemistry Geophysics Geosystems 13 (2012): Q08014 en_US
dc.identifier.uri http://hdl.handle.net/1912/5441
dc.description Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of [publisher] for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 13 (2012): Q08014, doi:10.1029/2012GC004163. en_US
dc.description.abstract Mapping and sampling of 18 eruptive units in two study areas along the Galápagos Spreading Center (GSC) provide insight into how magma supply affects mid-ocean ridge (MOR) volcanic eruptions. The two study areas have similar spreading rates (53 versus 55 mm/yr), but differ by 30% in the time-averaged rate of magma supply (0.3 × 106 versus 0.4 × 106 m3/yr/km). Detailed geologic maps of each study area incorporate observations of flow contacts and sediment thickness, in addition to sample petrology, geomagnetic paleointensity, and inferences from high-resolution bathymetry data. At the lower-magma-supply study area, eruptions typically produce irregularly shaped clusters of pillow mounds with total eruptive volumes ranging from 0.09 to 1.3 km3. At the higher-magma-supply study area, lava morphologies characteristic of higher effusion rates are more common, eruptions typically occur along elongated fissures, and eruptive volumes are an order of magnitude smaller (0.002–0.13 km3). At this site, glass MgO contents (2.7–8.4 wt. %) and corresponding liquidus temperatures are lower on average, and more variable, than those at the lower-magma-supply study area (6.2–9.1 wt. % MgO). The differences in eruptive volume, lava temperature, morphology, and inferred eruption rates observed between the two areas along the GSC are similar to those that have previously been related to variable spreading rates on the global MOR system. Importantly, the documentation of multiple sequences of eruptions at each study area, representing hundreds to thousands of years, provides constraints on the variability in eruptive style at a given magma supply and spreading rate. en_US
dc.description.sponsorship This work was supported by the National Science Foundation grants OCE08–49813, OCE08–50052, and OCE08– 49711. en_US
dc.format.mimetype text/plain
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2012GC004163
dc.subject Galapagos Spreading Center en_US
dc.subject Lava flow en_US
dc.subject Mid-ocean ridges en_US
dc.subject Submarine volcanism en_US
dc.title Effects of variable magma supply on mid-ocean ridge eruptions : constraints from mapped lava flow fields along the Galápagos Spreading Center en_US
dc.type Article en_US
dc.description.embargo 2013-02-25 en_US
dc.identifier.doi 10.1029/2012GC004163

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