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Major element variation of the S kaergaard pyroxene and its petrologic implications
Author(s) -
Jang YunDeuk,
Naslund H. Richard
Publication year - 2013
Publication title -
island arc
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.554
H-Index - 58
eISSN - 1440-1738
pISSN - 1038-4871
DOI - 10.1111/iar.12023
Subject(s) - pyroxene , electron microprobe , crystallization , geology , magma , magma chamber , intrusion , igneous differentiation , mineralogy , fractional crystallization (geology) , geochemistry , analytical chemistry (journal) , olivine , igneous rock , chemistry , basalt , volcano , organic chemistry , chromatography
Pyroxenes from the L ayered S eries ( LS ), U pper B order S eries ( UBS ), and M arginal B order S eries ( MBS ) of the S kaergaard intrusion were analyzed using electron microprobe and mineral separation techniques to examine geochemical variations. In general, pyroxenes from all three series show similar trends in major elements vs % crystallization: SiO 2 , MgO , Al 2 O 3 , and TiO 2 progressively decrease, FeO and MnO progressively increase, and CaO , Fe 2 O 3 , and P 2 O 5 do not change systematically with differentiation. Pyroxenes in the LS and MBS follow a trend similar to that reported by W ager and B rown. The estimated crystallization temperatures closely follow the general trends of published temperature estimates. Major element variation in S kaergaard pyroxenes shows smooth variations with increasing differentiation, indicating that there was no volumetrically significant injection of new magma into the chamber after the initial emplacement. These results strongly support the idea that the S kaergaard intrusion represents in situ crystallization under a closed system magma chamber.