The partitioning of selected transition element ions between olivine and groundmass of oceanic basalts

Henderson, Paul; Dale, I. M.

doi:10.1016/0009-2541(70)90044-6

Cited by 38 publications

(7 citation statements)

References 10 publications

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“…In the case of olivine the reaction would tend to lower the Ni concentration. The effect of this process is undoubtedly small for the samples studied here as there is virtually no correlation between the amount of Ni in the separated olivines and the amount of trapped liquid (Henderson et al 1971). Nickel concentrations might vary slightly from crystal to crystal within one hand specimen as there is evidence that the trapped liquid was not distributed homogeneously.…”

Section: Resultsmentioning

confidence: 83%

“…Post-depositional reaction of cumulus minerals with trapped liquid is one such possibility, as has been observed for the chrome-spinels in the Rhum intrusion (Henderson 1975). In the case of olivine the reaction would tend to lower the Ni concentration.…”

Section: Resultsmentioning

confidence: 90%

“…It requires that k is a constant throughout the extent of fractionation, and also that account is taken of the distribution of the modal proportions of the cumulus minerals. For the application of this expression to the Rhum intrusion, the concentration of Ni in the olivines at the base and top of a unit may be used but it is necessary to assume a value for the partition coefficient k. Results (Henderson and Dale 1970;Dale and Henderson 1972) for Ni distribution between olivine phenocrysts and groundmass of a number of basalts indicate that the Ni partition into olivine usually lies between 8 and 18 (although, exceptionally, values as low as 5 have been recorded). A partition coefficient of 10 is assumed but as is shown later the general conclusions concerning Rhum are not affected even if a value as low as 5 is taken.…”

Section: Resultsmentioning

confidence: 99%

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Trace element indicators of the genesis of the Rhum layered intrusion, Inner Hebrides

Henderson

Gijbels²

1976

SJG

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SYNOPSISAlmost constant concentration of nickel in cumulus olivine crystals taken from the bases and tops of many of the macrorhythmic units of Rhum indicates that a large volume of magma, if predominantly liquid, was needed to produce each unit. Some units represent less than 2 per cent by mass of a liquid parent magma.Rare earth element concentrations in cumulus plagioclases indicate that the parent magma was enriched in the light relative to the heavy rare earths. The estimated rare earth abundance pattern of the parent magma suggests that the melt was produced from a small amount of partial melting of upper mantle material.

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

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Trace element indicators of the genesis of the Rhum layered intrusion, Inner Hebrides

Henderson

Gijbels²

1976

SJG

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“…Ni contents of the magma are, however, largely controlled by the amount of normative olivine, and to a lesser extent, of pyroxene. Ni is partitioned from magma to olivine by factors ranging from 5 to 18 (Gunn 1971 ; Henderson and Dale 1969;Hakli and Wright 1967), whereas Cu enters the olivine lattice in only minute amounts. Hence, olivine fractionation depletes magma and sulfide liquid in Ni, enriches them in Cu, and decreases the Ni/Cu ratios (MacLean and Shimazaki 1976).…”

Section: Globulesmentioning

confidence: 99%

Sulfides in Leg 37 drill core from the Mid-Atlantic Ridge

MacLean¹

1977

Can. J. Earth Sci.

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Sulfides in 27 samples of drill core from four Leg 37 drill holes have been studied. Pynte is the most abundant sulfide, averaging 0.39 % 0.51% of basalt samples. Also present in basalt are sparse (0.0001%) and small ((8 p n ) magmatic globules of finely intergrown pyrrhotite, pentland~t e , and chalcopyrite4ss, as well as a few globules composed of only one of these minerals. Larger and more abundant magmatic globules are present in gabbro and peridotite; pyrite is a minor phase in these rocks.Fe. Ni. Cu, and S are the major elements. and Co a minor element in rhe globuIes. A v e n g e d NilCtr ratios Fur globules are: 3.3 (peridatitel, 1.0 (gabbro), and 0.4(basalt), the decrease in ralio indicaring less normi~tivcolivine in the respective parent magmas when the globules were formed.Sulfides in globules in peridotite. and to a lesser extent in gahhro. form distinci grains free of inclusions. and appear to have equilibrated to below 3110'C. In basalt rhe minenils are finely inrergmwn and ind~cate quenching above abour hOOCC, w i~h local equilibratian at lower tempemtures.Three analyses of sulfur in basalt glass ranged from 930 to 1160 ppm, in good agreement with other analyses of deep-ocean basalts.On a etudie les sulfures dans 27 echantillons de carottes provenant de quatre forages de la bordee 37, DSDP. La pyrite est la forme de sulfure la plus abondante avec en moyenne 0.39 4 0.51% des echantillons de basalte. I1 y a aussi dans le basalte de rares (0.0001%) et petits (<8 ~m ) globules magmatiques ou on observe la fine intercroissance de pyrrhotite, de pentlandite et de chalcopyrite, aussi bien que quelques globules comprenant seulement un de ces mineraux. Des globules magmatiques plus gros et plus abondants sont presents dans le gabbro et la peridotite, mais la pyrite dans ces roches est une phase mineure.Fe, Cu, Ni et S sont les elements majeurs et Co est un Clement mineur dans les globules. Les rapports moyens de Ni/Cu pour les globules sont: 3.3 (peridotite), 1.0 (gabbro) et 0.4 (basalte), la diminution du rapport indiquant moins d'olivine normative dans les magmas parents respectifs au moment de la formation des globules.Les sulfures dans les globules de la peridotite, et jusqu'i un certain point dans le gabbro, forment des grains distincts sans inclusions et paraissent avoir atteint l'equilibre en dessous de 300°C. Dans le basalte, les mineraux presentent une fine intercroissance, ce qui indique un refroidissement rapide au dessus d'environ 600°C avec equilibration localisee a plus basses temperatures.Trois analyses de soufre dans le verre basaltique donnent des valeurs de 930 a 1160 ppm, en accord avec d'autres analyses de basaltes des fonds oceaniques.[Traduit par le journal]Can.

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“…In fact this is easily seen if we compare the OSPE and partition coefficients of divalent cations (e.g. Henderson and Dale, 1970). Leeman and Scheidegger (1977) noted that the relation InD vs. OSPE is not linear for all the elements (especially Co has a higher D value) and argued that ionic size and OSPE are not the sole controls of partitioning.…”

Section: Discussion and Comparison With Other Studiesmentioning

confidence: 99%

Partitioning of chromium, manganese, cobalt and nickel between olivine and basaltic liquid: an experimental study

Mäkipää¹

1980

Bull Geol Soc Finland

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The partitioning of selected transition element ions between olivine and groundmass of oceanic basalts

Cited by 38 publications

References 10 publications

Trace element indicators of the genesis of the Rhum layered intrusion, Inner Hebrides

Trace element indicators of the genesis of the Rhum layered intrusion, Inner Hebrides

Sulfides in Leg 37 drill core from the Mid-Atlantic Ridge

Partitioning of chromium, manganese, cobalt and nickel between olivine and basaltic liquid: an experimental study

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