Deep pooling of low degree melts and volatile fluxes at the 85°E segment of the Gakkel Ridge: Evidence from olivine-hosted melt inclusions and glasses

Shaw, A. M.; Behn, M. D.; Humphris, Susan E.; Sohn, Robert A.; Gregg, P. M.

doi:10.1016/j.epsl.2009.11.018

Cited by 107 publications

(108 citation statements)

References 86 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly, the predicted pooled melt composition matches well with the melt inclusion data from the same samples (Shaw et al, 2010). Figure 3.…”

Section: Key Modeling Advances Produced Over the Duration Of The Ridgsupporting

confidence: 68%

Geodynamic Models of Melt Generation and Extraction at Mid-Ocean Ridges

Gregg¹,

Hebert²,

Montési³

et al. 2012

oceanog

View full text Add to dashboard Cite

“…Similarly, the predicted pooled melt composition matches well with the melt inclusion data from the same samples (Shaw et al, 2010). Figure 3.…”

Section: Key Modeling Advances Produced Over the Duration Of The Ridgsupporting

confidence: 68%

Geodynamic Models of Melt Generation and Extraction at Mid-Ocean Ridges

Gregg¹,

Hebert²,

Montési³

et al. 2012

oceanog

View full text Add to dashboard Cite

“…The average F and Cl concentration in the melt inclusions is 156 ± 44 ppm and 399 ± 45 ppm, respectively, demonstrating that F and Cl concentrations are relatively low and clustered compared to other Pacific rim melt inclusions (Figure 2). The low F concentrations are similar to those of melt inclusions from oceanic basalts from EPR (125 ± 43 ppm; Wanless and Shaw 2012), Juan de Fuca (117 ± 12 ppm; Wanless and Shaw 2012), and Gakkel ridge (150 ± 6 ppm; Shaw et al 2010). The Cl concentrations of Iwate melt inclusions are enriched compared to that of melt inclusions from Shaw et al 2010).…”

Section: Major Elementsmentioning

confidence: 50%

“…The low F concentrations are similar to those of melt inclusions from oceanic basalts from EPR (125 ± 43 ppm; Wanless and Shaw 2012), Juan de Fuca (117 ± 12 ppm; Wanless and Shaw 2012), and Gakkel ridge (150 ± 6 ppm; Shaw et al 2010). The Cl concentrations of Iwate melt inclusions are enriched compared to that of melt inclusions from Shaw et al 2010). …”

Section: Major Elementsmentioning

confidence: 50%

“…A mixture of these reservoirs can explain the variation in Pb-isotope compositions found in the melt inclusions. The positive correlation is interpreted as a degassing trend of both water and S. For reference, the blue circles are melt inclusions from EPR, Juan de Fuca, and Gakkel ridge basalts (Wanless and Shaw 2012;Shaw et al 2010 constant (Figure 4 degassing trend). During magma ascent, CO 2 degasses first, but this degassing can be sluggish which causes aliquots of melt to be entrapped in the olivine crystals (basalt liquidus forming mineral) prior to complete degassing of CO 2 .…”

Section: Magma Chamber Depth and H 2 O-co 2 Saturation Pressurementioning

confidence: 99%

See 1 more Smart Citation

Volatile (F and Cl) concentrations in Iwate olivine-hosted melt inclusions indicating low-temperature subduction

et al. 2014

View full text Add to dashboard Cite

Investigation of olivine-hosted melt inclusions provides information about the abundance of volatile elements that are often lost during subaerial eruptions of lavas. We have measured the abundances of H 2 O, CO 2 , F, Cl, and S as well as Pb isotopes in 29 melt inclusions in the scoria of the 1686 eruption of the Iwate volcano, a frontal-arc volcano in the northeast Japan arc. Pb Isotope compositions identify that Iwate magma is derived from a mixture of depleted mantle, subducted basalt, and sediment. Systematics of F in comparison to MORB and other arc magma indicates that (1) the slab surface temperature must be among the lowest on Earth and (2) hydrous minerals, such as amphibole, humites, and/or mica, must be present as residual phases during the dehydration of the slab.

show abstract

“…Estimates for the top of the partial melting region were deeper than about 25-30 km below slow spreading centers [Herzberg, 2004]. Shaw et al [2010] report evidence for melt pooling and crystallization at 9-20 km depth based on analyses of melt inclusions collected at the ultraslow spreading Gakkel ridge.…”

Section: Crystallization Within a Tblmentioning

confidence: 99%

Generation of permeability barriers during melt extraction at mid‐ocean ridges

Hebert

Montési

2010

Geochem Geophys Geosyst

View full text Add to dashboard Cite

[1] Melt focusing at mid-ocean ridges is necessary to explain the narrowness of the zone of crustal accretion and the formation of large but localized on-axis seamounts at slow and ultraslow spreading centers. It has been proposed that melt focusing is facilitated by the presence of a barrier to upward melt migration at the base of the thermal boundary layer (TBL). We assess the development of a melt impermeable boundary by modeling the geochemical evolution and crystallization history of melts as they rise into the TBL of mid-ocean ridges with different spreading rates. A permeability barrier, associated with a crystallization front controlled by the conductive thermal regime, exists for melt trajectories at slow to fast spreading ridges (≥10 mm/yr half rate). The effective lateral scope of the barrier, where the slope of the barrier exceeds a critical value that allows buoyant melt transport to the axis, generally increases with spreading rate. At all distances from the axis at ultraslow ridges and off-axis at slow spreading ridges, the weak crystallization front may prohibit formation of an efficient barrier and lead to the possibility that some fraction of melt may be incorporated into the lithospheric mantle, allowing refertilization. The protracted crystallization history and potential absence of an effective permeability barrier may explain the dearth of volcanism at ultraslow ridges and calls for a revision of lateral melt focusing scenarios at ultraslow spreading rates.

show abstract

Deep pooling of low degree melts and volatile fluxes at the 85°E segment of the Gakkel Ridge: Evidence from olivine-hosted melt inclusions and glasses

Cited by 107 publications

References 86 publications

Geodynamic Models of Melt Generation and Extraction at Mid-Ocean Ridges

Geodynamic Models of Melt Generation and Extraction at Mid-Ocean Ridges

Volatile (F and Cl) concentrations in Iwate olivine-hosted melt inclusions indicating low-temperature subduction

Generation of permeability barriers during melt extraction at mid‐ocean ridges

Contact Info

Product

Resources

About