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Recent volcanism in the Siqueiros transform fault: Picritic basalts and implications for MORB magma genesis

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Recent volcanism in the Siqueiros transform fault: Picritic basalts and implications for MORB magma genesis; 1996; Article; Journal; Earth and Planetary Science Letters; Perfit, M. R.; Fornari, D. J.; Ridley, W. I.; Kirk, P. D.; Casey, J.; Kastens, K. A.; Reynolds, J. R.; Edwards, M.; Desonie, D.; Shuster, R.; Paradis, S.

Summary

Small constructional volcanic landforms and very fresh-looking lava flows are present along one of the inferred active strike-slip faults that connect two small spreading centers (A and B) in the western portion of the Siqueiros transform domain. The most primitive lavas (picritic and olivine-phyric basalts), exclusively recovered from the young-looking flows within the A-B strike-slip fault, contain millimeter-sized olivine phenocrysts (up to 20 modal%) that have a limited compositional range (Fo91.5-Fo89.5) and complexly zoned Cr-Al spinels. High-MgO (9.5-10.6 wt%) glasses sampled from the young lava flows contain 1-7% olivine phenocrysts (Fo90.5-Fo89) that could have formed by equilibrium crystallization from basaltic melts with [...]

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Type Scheme Key
local-index unknown 70019037
local-pk unknown 70019037
series unknown Earth and Planetary Science Letters

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citationTypeArticle
journalEarth and Planetary Science Letters
languageEnglish
parts
typevolume
value141
typeissue
value1-4

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