The Isotopic Composition of Strontium in Oceanic and Continental Basalts: Application to the Origin of Igneous Rocks

Faure, Gunter; Hurley, Patrick

doi:10.1093/petrology/4.1.31

Cited by 161 publications

(36 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Rb/Sr ratios may be also used to suggest the parentage of these amphibolites. The average ratio of 0.19 is lower than that of pelites but in the range of the values present in basic to intermediate igneous rocks (Faure and Hurley, 1963). Ba and Ce contents range between 107×10 -6 and 961×10 -6 and 29×10 -6 and 67×10 -6 ; respectively, simulating basic igneous rocks.…”

Section: Geochemistrymentioning

confidence: 71%

Geochemistry and mineral chemistry of Pan-African amphibolites of South Sinai, Egypt

et al. 2010

View full text Add to dashboard Cite

In the Wadi Feiran area, amphibolites occur as inclusions, bands, linear bodies of variable thickness and irregular lenses in para-geneisses. Chemical evidence indicates that these amphibolites display an igneous origin and were derived from magma essentially of tholelitic rather than alkaline composition; transitional in character between continental and island-arc. The chemistry of amphiboles, related to pressure and temperature conditions of metamorphism, showed that they were formed under low pressure and high temperature conditions.

show abstract

Section: Geochemistrymentioning

confidence: 71%

Geochemistry and mineral chemistry of Pan-African amphibolites of South Sinai, Egypt

et al. 2010

View full text Add to dashboard Cite

show abstract

“…The studied trachytes show moderate initial 87 Sr/ 86 Sr ratios of about 0.7117 and 0.7095, respectively (Hashad et al 1981). The initial 87 Sr/ 86 Sr ratios for oceanic basalts of typical upper mantle origin range from 0.7020 to 0.7060 (Faure and Powell 1972) and for rocks of crustal origin are usually higher than 0.7100 (Faure and Hurley 1963). Accordingly, the rather moderate initial 87 Sr/ 86 Sr ratios of the UKT and UST along with positive K, Rb, REE (La, Ce, Nd) anomalies in multi-element variation diagrams indicate that those rocks were derived from a mantle source with a vital role of crustal contamination.…”

Section: Role Of Crustal Contaminationmentioning

confidence: 99%

Paleozoic alkaline volcanism: geochemistry and petrogenesis of Um Khors and Um Shaghir trachytes of the central Eastern Desert, Egypt

2010

View full text Add to dashboard Cite

The Um Khors and Um Shaghir trachyte (UKT and UST) plugs and sheets represent two conspicuous outcrops of Paleozoic alkaline volcanism in the central Eastern Desert of Egypt. The trachyte magmatisms erupted along the Pan-African NW-trending shear zone (302±15 and 273±15 Ma, respectively) and intruded the Late Proterozoic rocks of the studied area. The trachyte rocks consist mainly of sanidine, anorthoclase, albite, and quartz with a noticeable amount of aegirine-augite, aegirine, hedenbergite, and arvedsonite. The studied trachytes are moderately evolved in composition (with 62-67.5 wt.% SiO 2 ) and exhibit a limited compositional range in most of the major elements. They are alkaline in nature and considered as silicaoversaturated rocks. The rare earth elements (REE) patterns are somewhat uniform and highly fractionated, being enriched in light REE over heavy REE and show prominent negative Eu anomalies. The UKT and UST are enriched in high field strength elements Nb, Zr, and Y, consistent with typical within-plate alkaline magmatisms of extensional tectonic regimes. They were generated through the fractional crystallization of mantle-derived magmas. Although the UST is younger than the UKT, they show approximately similar chemical compositional ranges of the most major and trace elements, with somewhat higher MgO, Cr, Ni, and Ba contents in the former. This may argue against the evolution of the UST via a continuous fractional crystallization of the residual magmatic melt of the UKT. Thus, the UKT and UST are genetically related but could be emplaced through two various magmatic pulses of the same parent source (i.e., asthenospheric mantle source) at different times. The ascending magmatisms were subjected to variable significant degrees of crustal contamination during their generation.

show abstract

“…Eruptions are presumed to have been caused by injection of a dacitic magma into the chamber. Kurasawa and Fujimaki, 1974), Qua ternary volcanic rocks in Hokkaido (Kurasawa and Fujimaki, 1974), ocean ic ridge and oceanic island basalts (Hofmann and Hart, 1978), Type I island arcs (Japan arc except for Hokkaido, New Zealand and Sunda) (Faure and Hurley, 1963;Hedge, 1966;Ewart and Stipp, 1968;Hedge and Knight, 1969;Kurasawa, 1972;Whitford, 1975), Type II island arcs (Izu-Bonin, Mariana, New Britain, Papua New Guinea, Samoa, Tonga, South Sandwich and Lesser-Antilles) (Pushkar, 1968;Peterman et al, 1970;Hedge and Lewis, 1971;Hedge et al, 1972;Ewart et al, 1973;Gledhill and Baker, 1973;Pushkar et al, 1973;Page and Johnson, 1974;Peterman and Herring, 1974;Meijer, 1976 …”

Section: Sr Isotope Ratiomentioning

confidence: 99%

Petrological significance of granitic inclusions from Pliocene-early Pleistocene pyroclastic flow deposits in central Hokkaido, Japan.

Ikeda

1984

J. Japan. Assoc. Min. Petr. Econ. Geol.

View full text Add to dashboard Cite

The Isotopic Composition of Strontium in Oceanic and Continental Basalts: Application to the Origin of Igneous Rocks

Cited by 161 publications

References 0 publications

Geochemistry and mineral chemistry of Pan-African amphibolites of South Sinai, Egypt

Geochemistry and mineral chemistry of Pan-African amphibolites of South Sinai, Egypt

Paleozoic alkaline volcanism: geochemistry and petrogenesis of Um Khors and Um Shaghir trachytes of the central Eastern Desert, Egypt

Petrological significance of granitic inclusions from Pliocene-early Pleistocene pyroclastic flow deposits in central Hokkaido, Japan.

Contact Info

Product

Resources

About