Trace element modelling of magma evolution in the Fongen-Hyllingen Intrusion, Trondheim region, Norway

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Authors:Abu El-Rus, Mohamed A.
Author Affiliations:Primary:
Aarhus University, Department of Earth Sciences, Arhus, Denmark
Volume Title:Journal of Mineralogical and Petrological Sciences
Source:Journal of Mineralogical and Petrological Sciences, 98(2), p.47-75. Publisher: Mineralogical Society of Japan and the Japanese Association of Mineralogists, Petrologists and Economic Geologists, Sendai, Japan. ISSN: 1345-6296
Publication Date:2003
Note:In English. 80 refs.; illus., incl. 7 tables, sketch maps
Summary:The trace element evolution of the Fongen-Hyllingen Intrusion has been studied on the basis of ICP-MS analyses of 21 whole rocks and 12 plagioclase separates. Emphasis has been placed on Stage IV of the intrusion that crystallized essentially after magma addition had ceased. Whereas the compositions of minerals and rocks in Stage IV exhibit strong normal fractionation trends, crustal contamination is evident in a wide range of incompatible element ratios that should be relatively constant if simple fractional crystallization prevailed. Crustal contamination in Stage IV is confirmed by isotopic studies. The distribution of incompatible elements in Stage IV can be successfully explained by AFC modelling. Olivine compositions and isotopic ratios in the most primitive cumulates together with the slight LREE-enrichment in their coexisting melts suggest that the FHI parental magma was subjected to at least olivine fractionation during ascent to the magma chamber. This resulted in a decrease in the Mg-number of the melt without changing its isotopic ratio and incompatible trace element ratios. The slight enrichment in LREE and relatively low Zr/Y ratios in the melt coexisting with the most primitive cumulates imply that the FHI primary melt was derived from garnet-free mantle. The relative abundance of incompatible elements in the most primitive calculated melts, geochemically similar to low-Ti continental flood basalts, suggest that a subcontinental mantle source was most probable for the parental melt for FHI. [K.O.]
Sections:Geochemistry; Petrology
Subsections:Igneous petrology
Subjects:Basalts; Flood basalts; Fractional crystallization; Geochemical indicators; Geochemistry; Igneous rocks; Intrusions; Lithogeochemistry; Magma contamination; Magmas; Trace elements; Volcanic rocks; Europe; Norway; Scandinavia; Sor-Trondelag Norway; Trondheim Norway; Western Europe; Fonge-Hyllingen Intrusion
Coordinates:N633600 N633600 E0102300 E0102300
Abstract Numbers:05M/2138
Record ID:2003072990
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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