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

Perfit, Michael R.; Fornari, Daniel J.; Ridley, W. I.; Kirk, Paul D.; Casey, John F.; Kastens, Kim A.; Reynolds, Jennifer R.; Edwards, Margo H.; Desonie, Dana L.; Shuster, Robert Duncan; Paradis, Suzanne

doi:10.1016/0012-821x(96)00052-0

Cited by 141 publications

(132 citation statements)

References 43 publications

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“…The parental magma for the Ontong Java Plateau had 11% MgO, and crystallized olivine with Fo 87.7, the observed maximum [Sano and Yamashita, 2004]. The parental magma for Siqueiros MORB contained 14% MgO, based on maximum Fo 91.5 olivine [Perfit et al, 1996]. We note that, in the absence of lavas sufficiently primitive to only crystallize olivine, the lowest observed FeO among multiply saturated lavas in a suite provides an upper bound on the FeO and hence MgO contents of the parental magma.…”

Section: Calculation Of Parental Magmamentioning

confidence: 70%

“…This analysis will be restricted to the same four NMORB samples used by Green et al [2001]. However, for MORB from the Siqueiros Fracture Zone sample, we use sample ALV2384-007B [Perfit et al, 1996], which is similar to but slightly more primitive than sample D20-20 used in the study by Green et al [2001].…”

Section: Morbmentioning

confidence: 99%

“…Conditions of melting inferred from Figure A1 for fertile peridotite might be substantially in error if the source is depleted, as indicated by trace element depletions [Perfit et al, 1996].…”

Section: A5 Implications For Melting Conditions Melt Productivitymentioning

confidence: 99%

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Temperatures in ambient mantle and plumes: Constraints from basalts, picrites, and komatiites

Herzberg

Asimow

Arndt

et al. 2007

Geochem Geophys Geosyst

627

449

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International audienceSeveral methods have been developed to assess the thermal state of the mantle below oceanic ridges, islands, and plateaus, on the basis of the petrology and geochemistry of erupted lavas. One leads to the conclusion that mantle potential temperature (i.e., TP) of ambient mantle below oceanic ridges is 1430°C, the same as Hawaii. Another has ridges with a large range in ambient mantle potential temperature (i.e., TP = 1300–1570°C), comparable in some cases to hot spots (Klein and Langmuir, 1987; Langmuir et al., 1992). A third has uniformly low temperatures for ambient mantle below ridges, ∼1300°C, with localized 250°C anomalies associated with mantle plumes. All methods involve assumptions and uncertainties that we critically evaluate. A new evaluation is made of parental magma compositions that would crystallize olivines with the maximum forsterite contents observed in lava flows. These are generally in good agreement with primary magma compositions calculated using the mass balance method of Herzberg and O'Hara (2002), and differences reflect the well-known effects of fractional crystallization. Results of primary magma compositions we obtain for mid-ocean ridge basalts and various oceanic islands and plateaus generally favor the third type of model but with ambient mantle potential temperatures in the range 1280–1400°C and thermal anomalies that can be 200–300°C above this background. Our results are consistent with the plume model

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Section: Calculation Of Parental Magmamentioning

confidence: 70%

Section: Morbmentioning

confidence: 99%

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Temperatures in ambient mantle and plumes: Constraints from basalts, picrites, and komatiites

Herzberg

Asimow

Arndt

et al. 2007

Geochem Geophys Geosyst

627

449

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“…Nevertheless, this exercise demonstrates an important point: that the bulk oceanic crust must be significantly more mafic and significantly poorer in incompatible trace elements than is average MORB. Other approaches (e.g., Karson and Elthon, 1987;Perfit et al, 1996) suggest that the bulk oceanic crust is even more mafic and more incompatible element-depleted than the composition listed in Tables 7 and 8.…”

Section: Estimating the Bulk Composition Of The Oceanic Crustmentioning

confidence: 98%

Composition of the Oceanic Crust

White

Klein²

2014

Treatise on Geochemistry

190

160

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“…The resulting mixtures appear to reproduce the 9º-10ºN EPR trends quite well (Figures 4 & 5). We have also calculated mixing curves between Siqueiros E-MORB and D-MORB using the isotopic data from and the concentration data for the same samples published in Perfit et al (1996) and . These represent some of the most incompatible element-enriched and -depleted samples from the first order EPR segment between the Siqueiros and Clipperton transform faults and may be plausible regional end member mantle source compositions.…”

Section: Long-lived Radiogenic Isotopes: Sr Nd Hf and Pbmentioning

confidence: 99%

Temporal and petrogenetic constraints on volcanic accretionary processes at 9-10 degrees north East Pacific Rise

Waters¹

2010

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Volcanic accretion at the fast-spreading East Pacific Rise (EPR) occurs over a ~2-4 km wide neo-volcanic zone on either side of the axial summit trough (AST). Eruption ages are critical for understanding the distribution and timing of volcanic and magmatic activity. Uranium series nuclides are susceptible to fractionation by magmatic processes that occur beneath mid-ocean ridges, and the half-lives of

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

Cited by 141 publications

References 43 publications

Temperatures in ambient mantle and plumes: Constraints from basalts, picrites, and komatiites

Temperatures in ambient mantle and plumes: Constraints from basalts, picrites, and komatiites

Composition of the Oceanic Crust

Temporal and petrogenetic constraints on volcanic accretionary processes at 9-10 degrees north East Pacific Rise

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