Petrogenesis of the Darvazeh mafic-intermediate intrusive bodies, Qorveh, Sanandaj-Sirjanzone, Iran
| Autor: | Ali Asghar Sepahi, Tahereh Molaei Yeganeh, Eric H. Christiansen, Ashraf Torkian |
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| Rok vydání: | 2018 |
| Předmět: |
Peridotite
010504 meteorology & atmospheric sciences Gabbro Mantle wedge Continental crust Geochemistry 010502 geochemistry & geophysics 01 natural sciences Continental arc Diorite General Earth and Planetary Sciences Mafic Intermediate composition Geology 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Arabian Journal of Geosciences. 11 |
| ISSN: | 1866-7538 1866-7511 |
| Popis: | The Darvazeh intrusion in the northern Sanandaj-Sirjan zone in the Alpine-Himalayan orogenic belt is composed of olivine gabbro, gabbroic diorite and granitoid units that intruded Jurassic metamorphic rocks. Field relations, textures, and whole rock geochemistry indicate that most of the mafic to intermediate composition rocks are not cumulates and instead represent liquid compositions. The tholeiitic (or ferroan) gabbros and magnesian gabbroic diorites evolved along liquid lines of descent and have different parental magmas. This conclusion is based on separate trends, often with overlapping MgO contents, for Si, Fe, Ti, Ni, Cr, Zn, Cu and Sr. The mineralogy (late versus early magnetite and contrasting proportions of magmatic amphibole) of the two suites are also slightly different as is the trace element patterns (for example Th, U, Ti and Sr). The Mg# of mafic-intermediate rocks ranges from 46 to 73, implying that the ultimate source for the most mafic rocks was in the mantle, not the crust. Flat HREE patterns, Sm/Yb ratios ( |
| Databáze: | OpenAIRE |
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