Volume 25, Issue 1 (4-2017)                   www.ijcm.ir 2017, 25(1): 67-78 | Back to browse issues page

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The enigma of inherited Zircon crystals in Qalaylan plutone, Clues from the Gondwana crust in the rocks with primitive isotopic signatures. www.ijcm.ir 2017; 25 (1) :67-78
URL: http://ijcm.ir/article-1-43-en.html
Abstract:   (3528 Views)

The Qalaylan pluton of Late Jurassic age is composed of intermediate and felsic rocks that crop out in the northern Sanandaj-Sirjan Zone. A body is comprising alkaline, high K, Ferroan A1-type rocks with contrasting aspects; whiles, Nd-Sr primitive isotopic composition consistent with a mantle source. On the other hand, inherited zircon cores (with a range of 230 – 2700 Ma) and elevated Nd model ages (Avg. »670 Ma) indicate that the source of these rocks was not juvenile mantle-derived subduction related magma. Unusually large proportion of inherited zircons demonstrates that fast and non-equilibrium melting of pre-fertile crust with primitive isotopic signatures was the source of these rocks. Zoning and porphyritic texture of the body, oscillatory zoning of plagioclase grains and unusually amount of pre-magmatic zircons all are evidences of non-equilibrium condition as a result of fast cooling rate of parental magma of Qalaylan.

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Type of Study: Research | Subject: Special

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