THE PETROGRAPHICAL, GEOCHEMICAL AND ISOTOPICAL EVIDENCES OF CRUSTAL CONTAMINATION IN THE JAVAHERDASHT BASALTS (EAST OF GUILAN)

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HAGHNAZAR SH.; MALAKOUTIAN S.; ALAH YARI KH.; TAKI S.

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Journal: JOURNAL OF SCIENCE (KHARAZMI UNIVERSITY) Year:2008 | Volume:8 | Issue:3 Page(s): 163-182

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Title

THE PETROGRAPHICAL, GEOCHEMICAL AND ISOTOPICAL EVIDENCES OF CRUSTAL CONTAMINATION IN THE JAVAHERDASHT BASALTS (EAST OF GUILAN)

Author(s)

HAGHNAZAR SH. | MALAKOUTIAN S. | ALAH YARI KH. | TAKI S. | Issue Writer Certificate

Keywords

JAVAHERDASHT BASALTSQ3

CRUSTAL CONTAMINATIONQ3

ND-SR ISOTOPESQ3

GEOCHEMISTRYQ3

PETROGRAPHYQ4

Abstract

The JAVAHERDASHT BASALTS have considerable outcrops in the north part of Alborz mountains in the east of Guilan province. The petrographical, geochemical and isotopical evidence is indicative of the contamination of the basalts with continental crust. The petrographical evidence such as corosion gulf and crenated margins in pyroxene phenocrysts and chemical composition difference between clinopyroxene phenocrysts margins with matrix clinopyroxenes suggest of CRUSTAL CONTAMINATION and nonequilibrium due to the change of matrix composition as compared with pre-existed phenocrysts in rock. The depletion in elements such as Zr, Nb, TiOz, PzOs and enrichment of LIL elements, high ratios of Pb/Nd and Ba/Nd, low content of Zr/Nb, Y/Nb, Ce/Pb, positive correlation between SiO2 and 87Sr/86Sr and positive correlation between MgO and ENd are geochemical and isotopical evidences of CRUSTAL CONTAMINATION of these basalts. Our studies show that these basalts have a clear elemental equilibrium with lower and middle crust rocks and that they have been contaminated with them

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APA: Copy

HAGHNAZAR, SH., MALAKOUTIAN, S., ALAH YARI, KH., & TAKI, S.. (2008). THE PETROGRAPHICAL, GEOCHEMICAL AND ISOTOPICAL EVIDENCES OF CRUSTAL CONTAMINATION IN THE JAVAHERDASHT BASALTS (EAST OF GUILAN). JOURNAL OF SCIENCE (KHARAZMI UNIVERSITY), 8(3), 163-182. SID. https://sid.ir/paper/43943/en

Vancouver: Copy

HAGHNAZAR SH., MALAKOUTIAN S., ALAH YARI KH., TAKI S.. THE PETROGRAPHICAL, GEOCHEMICAL AND ISOTOPICAL EVIDENCES OF CRUSTAL CONTAMINATION IN THE JAVAHERDASHT BASALTS (EAST OF GUILAN). JOURNAL OF SCIENCE (KHARAZMI UNIVERSITY)[Internet]. 2008;8(3):163-182. Available from: https://sid.ir/paper/43943/en

IEEE: Copy

SH. HAGHNAZAR, S. MALAKOUTIAN, KH. ALAH YARI, and S. TAKI, “THE PETROGRAPHICAL, GEOCHEMICAL AND ISOTOPICAL EVIDENCES OF CRUSTAL CONTAMINATION IN THE JAVAHERDASHT BASALTS (EAST OF GUILAN),” JOURNAL OF SCIENCE (KHARAZMI UNIVERSITY), vol. 8, no. 3, pp. 163–182, 2008, [Online]. Available: https://sid.ir/paper/43943/en

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