Upper mantle source for some hawaiites, mugearites and benmoreites

Green, David H.; Edgar, A. D.; Beasley, P.; Kiss, E.; Ware, N. G.

doi:10.1007/bf00399108

Cited by 115 publications

(32 citation statements)

References 15 publications

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“…Although in some cases this fractionation appears to occur in the upper mantle based on the presence of peridotite xenoliths in some mugearites and related rocks (35)(36)(37), it more commonly occurs in crustal magma chambers or at even shallower depth within a volcanic edifice (e.g., 15,16,38). With this in mind, we used MELTS (39,40) to simulate fractional crystallization of a primitive Tenerife melt composition over a range of pressures (1-6000 bar), water concentrations (0-3 wt.…”

Section: Petrogenesis Of Jmmentioning

confidence: 99%

The Petrochemistry of Jake_M: A Martian Mugearite

Stolper

Baker

Newcombe

et al. 2013

Science

148

203

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Jake_M, the first rock analyzed by the APXS instrument on the Curiosity rover, differs significantly in chemical composition from other known martian igneous rocks: It is alkaline (>15% normative nepheline) and relatively fractionated. Jake_M is similar compositionally to terrestrial mugearites, a rock type typically found at ocean islands and continental rifts. By analogy with these comparable terrestrial rocks, Jake_M could have been produced by extensive fractional crystallization of a primary alkaline or transitional magma at elevated pressure, with or without elevated water contents. The discovery of Jake_M suggests that alkaline magmas may be more abundant on Mars than on Earth and that Curiosity could encounter even more fractionated alkaline rocks (e.g., phonolites and trachytes). Introduction:

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Section: Petrogenesis Of Jmmentioning

confidence: 99%

The Petrochemistry of Jake_M: A Martian Mugearite

Stolper

Baker

Newcombe

et al. 2013

Science

148

203

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“…Les faibles teneurs en Ni (124 ppm) et MgO (7%) des basaltes révèlent le caractère évolué de leur magma parent. Il n'est donc pas possible d'assimiler cette composition à celle d'un magma parent issu de la fusion partielle d'une source mantellique lherzolitique (riche en Fo 90 ) avec 400 ppm de Ni (Green et al, 1974), à moins que celui-ci n'ait lui-même subi une cristallisation précoce d'olivine l'ayant appauvri en Mg et Ni. Les valeurs élevées des rapports CeN/YbN des basaltes (entre 13,0 et 18,0) sont de l'ordre de celles qui caractérisent les basaltes du domaine continental de la "Ligne Chaude du Cameroun" (12 < Ce N /Yb N < 22, (Ngounouno et al, 2003.…”

Section: Caractéristiques Chimiquesunclassified

Géochimie des laves basaltiques récentes des zones Nord et Est de Ngaoundéré (Cameroun, Plateau de l’Adamaoua, Afrique centrale): pétrogenèse et nature de la source

Nkouandou¹,

Ngounouno²,

Dennielou³

2011

International Journal of Biological and Chemical Sciences

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“…Olivine with this composition should crystallize in equilibrium with a melt with Mg number 0.474, very similar to that of the initial melt (F1) calculated by summation here. This Mg number is not, however, a candidate for a primary basaltic melt that usually has an Mg number around 0.70 (Green et al, 1974), implying that the FHI initial melt was relatively evolved. It therefore seems likely that the FH parental magma evolved from a mantle derived composition in an underlying magma chamber before entering the FH magma chamber.…”

Section: Parental Magma Compositionmentioning

confidence: 91%

Magma evolution in the upper part (Stage IV) of the Fongen-Hyllingen Layered Intrusion, central Norway

El-Rus

Wilson

Sørensen

2007

Journal of Mineralogical and Petrological Sciences

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The upper part (Stage IV) of the Fongen Hyllingen intrusion, southeast of Trondheim, Norway, comprises a ~ 1800 m thick sequence of cumulates showing a strong normal fractionation trend from olivine gabbros at the bottom through diorites to quartz bearing syenites at the roof. Mineral compositions show extreme ranges: olivine Fo 74−0 ; Ca rich pyroxene Mg#79 0; plagioclase An 60−0 . The cumulate sequence has been divided into five intervals based on cumulus assemblages. The summation method has been used to calculate successive magma compositions for these intervals based on whole rock major element chemical analyses of 49 samples. The most primitive calculated magma composition has 51.7% SiO 2 , 5.0% MgO, 5.3% total alkalis and a Mg number of 47.5; it lies near the base of the basaltic trachyandesite field in the Total Alkali Silica (TAS) diagram, very close to the dividing line between tholeiitic and alkaline suites. This magma evolved through the trachyandesite field into the trachyte field. The most evolved magma composition has ~ 11.4% alkalies; alkali enrichment is not due to assimilation of metapelites. There was very little iron enrichment during fractionation and magma density decreased continuously, enabling repeated influxes of new magma to pond and to elevate the resident melt, facilitating magma stratification. The parental magma may have resided in a lower crustal chamber where it differentiated before repeatedly supplying the overlying Fongen Hyllingen chamber.

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Upper mantle source for some hawaiites, mugearites and benmoreites

Cited by 115 publications

References 15 publications

The Petrochemistry of Jake_M: A Martian Mugearite

The Petrochemistry of Jake_M: A Martian Mugearite

Géochimie des laves basaltiques récentes des zones Nord et Est de Ngaoundéré (Cameroun, Plateau de l’Adamaoua, Afrique centrale): pétrogenèse et nature de la source

Magma evolution in the upper part (Stage IV) of the Fongen-Hyllingen Layered Intrusion, central Norway

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