The Rare Earth Content and Origin of Alkali-Rich Basalts

Kay, Robert W.; Gast, P. W.

doi:10.1086/627919

Cited by 399 publications

(132 citation statements)

References 69 publications

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“…The nephelinite sam ple has the highest LREE ([La]N=162) and low HREE ([Yb]N=7.2). Similar variation trends have been described from some other suites of alkali basaltic lavas (e.g., Kay and Gast, 1973;Shimizu and Arculus, 1975). To explain such REE variations, Kay and Gast (1973) The abundance ranges of the incompatible trace elements including Th, Ta, Nb, Zr, Hf, Y, P, Rb, Ba and Sr resemble those of other con tinental alkali basalt suites (e.g., Frey et al, 1978;Wedepohl, 1985).…”

Section: Incompatible Trace Elementssupporting

confidence: 73%

Geochemistry and origin of Pliocene alkali basaltic lavas from Anhui-Jiangsu, eastern China.

Dostál

Dupuy²,

Zhai

et al. 1988

Geochem. J.

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The Pliocene volcanic rocks of the Anhui-Jiangsu region of eastern China are composed of an alkali basaltic suite consisting of alkali basalts, basanites and nephelinites.The basalts underwent a limited degree of fractional crystallization dominated in the initial stage by olivine and subsequently by clinopyroxene.The magmas were derived from a metasomatized amphibole-bearing garnet peridotite source variously enriched in incompatible trace elements. The metasomatic enrichment of the incompati ble trace elements was probably produced by a zone refining process and was superimposed on a depleted upper mantle source compositionally similar to that of mid-ocean ridge basalts.

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Section: Incompatible Trace Elementssupporting

confidence: 73%

Geochemistry and origin of Pliocene alkali basaltic lavas from Anhui-Jiangsu, eastern China.

Dostál

Dupuy²,

Zhai

et al. 1988

Geochem. J.

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“…By the way, some caution may be drawn (Fig. 3) to the fact that the extension of the Here let us turn our attention to the genesis of the potassic basalts (KAY and GAST , 1973;SAHAMA, 1974), which was discussed by KAY and GAST (1973) based on a partial melting model.…”

Section: Petrological Implicationsmentioning

confidence: 99%

“…2 became effective for the second stage. Follow ing this possible working hypothesis, let us look for a switching point between two stages with respect to the felsic potassic basalts investigated by KAY and GAST (1973).…”

Section: Petrological Implicationsmentioning

confidence: 99%

“…REE abundances in this sample have demonstrated to imply that this basalt has a history of temporary separation from melt with 6 8 times chondritic REE abundances through the regulation of the terrace-shaped partition coefficient function. It was also attempted to use the schanze-shaped partition coefficient function in order to explain the genesis of felsic potassic basalt (KAY and GAST , 1973) based on two-stage fractional crystallization model. The REE pattern of the material removed during the second stage was calculated together with the "liquid-type" pattern corresponding to the switching point between two stages in question.…”

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confidence: 99%

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Search for chemical effect on partitioning of rare-earth elements in the crystallization process of basaltic systems at 20kb, with some applications.

1977

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Employing two kinds of basalts, i.e., alkali olivine basalt and high-alumina basalt , the partitioning of REE was investigated for partial crystallization at 20kb. Even with the same alkali olivine basalt , the peak-shaped and the terrace-shaped partition coefficient functions were obtained, although both of them belong to a major "rectilinear" partition coefficient group. This difference in the shape appears to be associated with the relative content of Ca to Mg and Fe in crystal phase.Meanwhile, use of a high-Al basalt yielded a new partition coefficient function (schanze-shaped) quite distinct from rectilinear functions and their varieties. Intriguingly, addition of MgO (5%) to the high-Al basalt powder (95%) brought about a drastic change of partition coefficient function , resulting in the terrace-shaped one. It is evinced that the higher values of atomic ratios , Al/(Mg+Fe+Ca) and Si/(Mg+Fe+Ca), in the starting material are favorable to the appearance of schanze-shaped partition coefficient function.Besides, REE in island arc tholeiite from New Britain were accurately determined . REE abundances in this sample have demonstrated to imply that this basalt has a history of temporary separation from melt with 6 8 times chondritic REE abundances through the regulation of the terrace-shaped partition coefficient function. It was also attempted to use the schanze-shaped partition coefficient function in order to explain the genesis of felsic potassic basalt (KAY and GAST , 1973) based on two-stage fractional crystallization model. The REE pattern of the material removed during the second stage was calculated together with the "liquid-type" pattern corresponding to the switching point between two stages in question.

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“…Precision, estimated from counting statistics and duplicate samples was never worse than 10% for La, Sm, Sc; 15% for Eu, Tb, Yb, Lu, Hf and Th; 20% for Nd, Ce and typically is much better than these figures. (SCHILLING andWINCHESTER, 1969: KAY andGAST , 1973 Also the lack of a positive Eu anomaly implies that the Norfolk Island basalts have not achieved their moderately high A1203 content through melting or crystal lization processes (e.g. flotation)…”

Section: Introductionmentioning

confidence: 99%

Rare earth geochemistry of basalts from Norfolk Island, and implications for mantle inhomogeneity in the rare earth elements.

Green

1978

Geochem. J.

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The basalts of Norfolk Island range from tholeiites through transitional basalts to alkali olivine basalts, and plot in a unique field on a Ti-Zr-Y diagram . REE abundances in seven representative samples are similar to those in tholeiites and alkali olivine basalts from Hawaii , i.e. light REE enrichment relative to chondrites, and a slightly higher La/Yb value for the alkali olivine basalts relative to the tholeiites . Three tholeiitic samples with anomalously high Y (84-105ppm) show unique REE patterns for basaltic rocks, with a relative enrichment of the middle REE . Apart from Y and REE these samples are chemically identical to the `normal' Y-REE tholeiites from Norfolk Island, and it is suggested that the unique Y and REE contents are due to variable Y and REE concentrations in an accessory mantle phase such as apatite and/or the Y acceptor RE phosphate minerals such as xenotime or samarskite inhomogeneously distributed in the source region for the basalts.

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The Rare Earth Content and Origin of Alkali-Rich Basalts

Cited by 399 publications

References 69 publications

Geochemistry and origin of Pliocene alkali basaltic lavas from Anhui-Jiangsu, eastern China.

Geochemistry and origin of Pliocene alkali basaltic lavas from Anhui-Jiangsu, eastern China.

Search for chemical effect on partitioning of rare-earth elements in the crystallization process of basaltic systems at 20kb, with some applications.

Rare earth geochemistry of basalts from Norfolk Island, and implications for mantle inhomogeneity in the rare earth elements.

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