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Petrological and geochemical nature of mesocratic and melanocratic dykes in Lakhshak granodiorite, Northwest of Zahedan

Document Type : Original Research Paper

Authors

1 M. Sc, Department of Geology, Faculty of Sciences, University of Sistan and Baluchestan, Zahedan, Iran

2 Assistant Professor, Department of Geology, Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran

3 Ph.D. Student, Department of Geology, Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran

4 Ph.D., Department of Geology, Islamic Azad University, Science and Research Branch, Tehran, Iran

Abstract

The Lakhshak granodiorite body with Oligo-Miocene age crops out in flysch sediments of northwest of Zahedan. This body has been intruded by dykes with variable color indices ranging from mesocratic to melanocratic, and NE-SW trend. Based on field observations, , melanocratic dykes have cut mesocratic dykes in some parts.This indicates that mesocratic dykes are younger than the melanocratic types. Different thickness (2 to 12m) of dykes shows the effect of tectonic activities and magama injection into structural joints, and the formation of dykes during tectonic activity. In terms of lithology, the Lakhshak body is composed of granodiorite, dacitic mesocratic dykes and melanocratic dykes of microdioritic and andesitic types. The granodiorite body and the two types of dykes are of I type nature, and are calc-alkaline, high-K calc-alkaline and metaluminous. Based on the geochemical characteristics, dykes and granodiorite show enrichment in LILE, LREE such as Ba, Cs, Rb, Eu and Pb, and depletion in HFSE, HREE such as Nb, Ti and Ta, which are related to index characteristics of the volcanic arc setting of an active continental margin. Pb positive anomaly may demonstrate continental crust assimilation by magma associated with mantle metasomatism. Based on field observation and petrogenesis, the Lakhshak granodiorite and mesocratic-melanocratic dykes originated from magmatic activity of subducted oceanic crust (Sistan plate) beneath the continental plate (Afghan block). The parental  magma of the Lakhshak granitoid was originated from melts  resulted from amphibolite melting, and dykes are the late derivative of magma recrystallization granodiorite.

Keywords

References
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Scientific Quarterly Journal of Geosciences
Volume 26, Issue 104
VOL.26, NO104
September 2017
Pages 149-162
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