Mid-ocean ridge popping rocks: implications for degassing at ridge crests

Sarda, Philippe; Graham, David W.

doi:10.1016/0012-821x(90)90047-2

Cited by 227 publications

(130 citation statements)

References 49 publications

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“…The carbon isotopic compositions of methane and carbon dioxide from 9°50'N samples are summarized in Figure 3 and (CHARLOU et al, 2002;CHARLOU et al, 1996;JEAN-BAPTISTE et al, 1991;LILLEY et al, 1993;SHANKS et al, 1995;TAYLOR, 1986;WELHAN and CRAIG, 1983;WELHAN and LUPTON, 1987), and are very similar to the -4‰ values measured in highly vessiculated basalt "popping rocks" thought to represent the average composition of undegassed CO 2 residing in the upper crust (JAVOY and PINEAU, 1991;PINEAU and JAVOY, 1994;SARDA and GRAHAM, 1990). The high concentrations of CO 2 enriched in 13 C relative to other hydrothermal sites suggest an undegassed, primordial, magmatic source of CO 2 .…”

Section: Stable Carbon Isotopic Compositionmentioning

confidence: 52%

Stable isotopic evidence in support of active microbial methane cycling in low-temperature diffuse flow vents at 9°50′N East Pacific Rise

Proskurowski

Lilley

Olson

2008

Geochimica et Cosmochimica Acta

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Section: Stable Carbon Isotopic Compositionmentioning

confidence: 52%

Stable isotopic evidence in support of active microbial methane cycling in low-temperature diffuse flow vents at 9°50′N East Pacific Rise

Proskurowski

Lilley

Olson

2008

Geochimica et Cosmochimica Acta

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“…Extra gas loss might be due in the MORB glasses studied here [Sarda and Graham, 1990]. to vesicle bursting during eruption when water depth is low Various extents of vesicle loss during several stages of magma enough and vesicularity high enough, as is observed on the migration toward the surface must also play an important role.…”

Section: Introductionmentioning

confidence: 80%

Rare gas systematics on the southernmost Mid‐Atlantic Ridge: Constraints on the lower mantle and the Dupal source

Sarda¹,

Moreira²,

Staudacher³

et al. 2000

J. Geophys. Res.

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123

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“…In addition, there are special samples known as "popping rocks" that are occasionally recovered from the sea floor and have exceptionally high CO 2 contents. Sarda and Graham [1990] have suggested that the high inferred CO 2 contents of these rocks are more indicative of the actual abundance of CO 2 in MORB prior to degassing. Thus, it is possible that there is substantial CO2 in the MORB mantle source, and that, as for ocean islands, the deep parts of the melting column are alkaline rocks with low Si0 2 and high FeO.…”

Section: Evidence From Ocean Islands: Toxard a Solution To The Local mentioning

confidence: 99%

Petrological Systematics of Mid-Ocean Ridge Basalts: Constraints on Melt Generation Beneath Ocean Ridges

Langmuir

Klein

Plank

2013

Geophysical Monograph Series

664

390

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Mid-ocean ridge basalts (MORB) are a consequence of pressure-release melting beneath ocean ridges, and contain much information concerning melt formation, melt migration and heterogeneity within the upper mantle. MORB major element chemical systematics can be divided into global and local aspects, once they have been corrected for low pressure fractionation and interlaboratory biases. Regional average compositions for ridges unaffected by hot spots ("normal" ridges) can be used to define the global correlations among normalized Na20, FeO, TiO2 and Si02 contents, CaO/Al203 ratios, axial depth and crustal thickness. Back-arc basins show similar correlations, but are offset to lower FeO and TiO2 contents. Some hot spots, such as the Azores and Galapagos, disrupt the systematics of nearby ridges and have the opposite relationships between FeO, Na 20 and depth over distances of 1000 km.Local variations in basalt chemistry from slow-and fast-spreading ridges are distinct from one another. On slow-spreading ridges, correlations among the elements cross the global vector of variability at a high angle. On the fast-spreading East Pacific Rise (EPR), correlations among the elements are distinct from both global and slow-spreading compositional vectors, and involve two components of variation. Spreading rate does not control the global correlations, but influences the standard deviations of axial depth, crustal thickness, and MgO contents of basalts.Global correlations are not found in very incompatible trace elements, even for samples far from hot spots. Moderately compatible trace elements for normal ridges, however, correlate with the major elements. Trace element systematics are significantly different for the EPR and the mid-Atlantic Ridge (MAR). Normal portions of the MAR are very depleted in REE, with little variability; hot spots cause large long wavelength variations in REE abundances. Normal EPR basalts are significantly more enriched than MAR basalts from normal ridges, and still more enriched basalts can erupt sporadically along the entire length of the EPR. This leads to very different histograms of distribution for the data sets as a whole, and a very different distribution of chemistry along strike for the two ridges. Despite these differences, the mean Ce/Sm ratios from the two ridges are identical.Existing methods for calculating the major element compositions of mantle melts [Klein and Langmuir, 1987;McKenzie and Bickle, 1988;Niu and Batiza, 1991] are critically examined. New quantitative methods for mantle melting and high pressure fractionation are developed to evaluate the chemical consequences of melting and fractionation processes and mantle heterogeneity. The new methods rely on new equations for partition coefficients for the major elements between mantle minerals and melts. The melting calculations can be used to investigate the chemical compositions produced by small extents of melting or high pressures of melting that cannot yet be determined experimentally. Application of the new models to the ...

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Mid-ocean ridge popping rocks: implications for degassing at ridge crests

Cited by 227 publications

References 49 publications

Stable isotopic evidence in support of active microbial methane cycling in low-temperature diffuse flow vents at 9°50′N East Pacific Rise

Stable isotopic evidence in support of active microbial methane cycling in low-temperature diffuse flow vents at 9°50′N East Pacific Rise

Rare gas systematics on the southernmost Mid‐Atlantic Ridge: Constraints on the lower mantle and the Dupal source

Petrological Systematics of Mid-Ocean Ridge Basalts: Constraints on Melt Generation Beneath Ocean Ridges

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