The distribution of trace elements during strong fractionation of basic magma—a further study of the Skaergaard intrusion, East Greenland

Wager, L. R.; Mitchell, R. L.

doi:10.1016/0016-7037(51)90016-6

Cited by 267 publications

(57 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The decrease in the amount of Cr and of the ratio Ni/Co with the degree of differentiation is well established in all the magmatic suites (Nockolds & Allen, 1953, 1956. A similar trend is also observed for Cr in oxides (Wager & Mitchell, 1951;Vincent & Phillips, 1954;Carstens, 1957;Papezik, 1965;Lister, 1966).…”

Section: Minor Elements In the Oxidessupporting

confidence: 61%

Iron-Titanium Oxide Minerals in the Bjerkrem-Sogndal Massif, South-western Norway

Duchesne

1972

Journal of Petrology

110

View full text Add to dashboard Cite

Ilmenite and magnetite are investigated from the point of view of their distribution, microtexture, and chemical composition (major and minor elements) in the Bjerkrem-Sogndal massif (Egersund area, South-Rogaland, SW. Norway). This massif is an igneous layered synkinematic lopolith made up of cumulates of the anorthosite-mangerite suite. The lower part of the massif presents a rhythmic structure.The microtextures of ilmenite result from simple exsolution of ilmenite-hematite solid solutions. Magnetite contains intergrowths of ilmenite formed by oxidation-exsolution of ulvospinel-magnetite solid-solutions.In the stratigraphic sequence, on a large scale, ilmenite appears first alone, and is then accompanied by magnetite; its hematite content decreases towards the top of the massif, while the titanium content of the magnetite increases. On the scale of the rhythms, similar trends but of lesser amplitude are also observed.Evidence of deuteric readjustment of the orthomagmatic composition of the two oxides is provided (1) by the observation of microtextures at the contact between grains (zoning of primary ilmenite and rim of secondary ilmenite) (2) by the existence of differences in chemical composition between isolated grains and grains in contact, and (3) by the determination of the equilibrium temperature by means of the Buddington and Lindsley geothermometer.Reconstitution of the T-fo, orthomagmatic conditions in two particular levels of the massif shows that the reducing character of the magma increases during differentiation. The sudden changes in the oxide assemblage at the base of the rhythms reflect a sudden increase in the/o, of the magma. These increases, as shown by variation in Cr, Ni, and Co, are due to recurrences of the basic character of the magma.The variations of the minor elements Mn, V, Ga, and Zn are interpreted in terms of the influence of the deuteric readjustment. It follows that the ratios Mn/Fe a+ , Ga/Fe 34 ", and Zn/ Fe 1+ increase and that the ratio V/Fe 3+ decreases in the magma in the course of differentiation. The distribution of Mn between ilmenite and magnetite is discussed.Intermittent supplies of undifferentiated magma are proposed as the geological mechanism controlling the chemical recurrences associated with the rhythmic structure.

show abstract

Section: Minor Elements In the Oxidessupporting

confidence: 61%

Iron-Titanium Oxide Minerals in the Bjerkrem-Sogndal Massif, South-western Norway

Duchesne

1972

Journal of Petrology

110

View full text Add to dashboard Cite

show abstract

“…In the Skaergaard intrusion of East Greenland, late-stage differentiates of the layered mafic-ultramafic complex have unusually strong enrichment of zirconium; that is, greater than 1,000 ppm. The enrichment is particularly significant because the initial magma concentration was 94 ppm, which is similar to the average zirconium content of tholeiitic or subalkaline basalts (Wager and Mitchell, 1951;Brooks, 1969).…”

Section: +mentioning

confidence: 78%

Zirconium and hafnium

Jones¹,

Piatak²,

Bedinger³

2017

Professional Paper

View full text Add to dashboard Cite

Division; available at http://periodic.lanl.gov/images/periodictable.pdf. Cover.Photographs showing examples of sources and uses of zirconium and hafnium. Upper left, cube and crystal bars of highly pure zirconium metal (greater than 99.95 percent purity). Upper right, a pure (99.98 percent) melted tip of a hafnium electrode used in an electron beam remelting furnace for manufacturing metal parts; an oxidized hafnium electron beam remelted ingot; and a cubic centimeter of hafnium metal. Photographs by Heinrich Pniok (http://pse-mendelejew.de). Lower left, primary igneous zircon grains separated from granite. Lower middle, detrital zircon grains separated from metamorphosed sandstone. Lower right, baddeleyite crystals from the Palabora carbonatite deposit, Limpopo Province, South Africa. Photographs by Rob Lavinsky (www.iRocks.com).

show abstract

“…Similar considerations account for the distribution of most trace elements in igneous rocks. A number of detailed discussions of the factors involved are available, including those of Nockolds & Mitchell (1948) and Wager & Mitchell (1951). Among sedimentary rocks the chief soil parent materials are the argillaceous shales and slates and the arenaceous sandstones and related rocks.…”

Section: Vol 19mentioning

confidence: 99%

Trace elements in Scottish soils

Mitchell¹

1960

Proc. Nutr. Soc.

View full text Add to dashboard Cite

The distribution of trace elements during strong fractionation of basic magma—a further study of the Skaergaard intrusion, East Greenland

Cited by 267 publications

References 29 publications

Iron-Titanium Oxide Minerals in the Bjerkrem-Sogndal Massif, South-western Norway

Iron-Titanium Oxide Minerals in the Bjerkrem-Sogndal Massif, South-western Norway

Zirconium and hafnium

Trace elements in Scottish soils

Contact Info

Product

Resources

About