What question did this study set out to answer?

To evaluate the geochemical variations, mantle source heterogeneities, and scales of magmatic segmentation along a superfast-spreading mid-ocean ridge segment.

April 10, 1991Journal of Geophysical Research AtmospheresOpen Access

Magmatic processes at superfast spreading mid‐ocean ridges: Glass compositional variations along the East Pacific Rise 13°–23°S

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Authors

JSJohn M. SintonUniversity of Hawaiʻi at Mānoa SSSuzanne M. SmaglikYakima Valley Community College JMJohn J. MahoneyHydrologic Research Center

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Implication

Geochemical analysis reveals multi-scale magmatic segmentation along the superfast-spreading East Pacific Rise, indicating decoupled mantle upwelling and crustal differentiation processes.

Key Points

To evaluate the geochemical variations, mantle source heterogeneities, and scales of magmatic segmentation along a superfast-spreading mid-ocean ridge segment.
Analyzed major and minor element geochemistry of N=496 natural volcanic glass samples collected from 141 locations along the East Pacific Rise (13°–23°S) and adjacent seamounts.
Categorized samples into 212 chemical groups representing distinct volcanic flow units to trace parental magma variations, liquid lines of descent, and segmentation boundaries.
Identified secondary magmatic segments with lengths ranging from 11 to 185 km (mean 69 ± 57 km), correlating positively with spreading rates across mid-ocean ridges.
Documented nearly twofold monotonic increases in K/Ti and K/P from 23°S to 13°S, which decouple from mantle isotopic ratios north of 17°S.
Observed subaxial magmatic temperature variations with a characteristic length scale of 217 ± 60 km, reflecting regional decoupling among mantle temperature, magma supply, and shallow differentiation.

Cite This Study

Sinton et al. (1991) studied this question.

synapsesocial.com/papers/6a75c4f9dcfefe9676dd9453 https://doi.org/10.1029/90jb02454

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Implication

Geochemical analysis reveals multi-scale magmatic segmentation along the superfast-spreading East Pacific Rise, indicating decoupled mantle upwelling and crustal differentiation processes.

Magmatic processes at superfast spreading mid‐ocean ridges: Glass compositional variations along the East Pacific Rise 13°–23°S

Discussion

Member takes

Implication

Key Points

Cite This Study

Magmatic processes at superfast spreading mid‐ocean ridges: Glass compositional variations along the East Pacific Rise 13°–23°S

Discussion

Member takes

Implication

Key Points

Cite This Study

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