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Title

A-type Granites of North Sanandaj-Sirjan zone, new observation, new classification

Pages

  221-230

Abstract

 he east Sanadaj-Galali plutons of the northern Sanandaj-Sirjan Zone, Zagros Orogeny, are composite, polyphase bodies that generated during subduction ofNeotethys beneath the Eurasian plate. A-type magmatism in this area presents by Alkaline, high K, ferroan leucogranites. Despite having mineralogical and isotopic similarities, these leucogranites show a clear division, based on the geochemical and SHRIMP zircon crystal dating results. Qalaylan leucogranite with the crystallization age of 159 ± 3Ma is Al-type. Other leucogranites are A2-type and crystalized about 20 million years later (140-149 Ma). In fact, mantle derived mafic magma, as heat source, caused partial melting of heterogeneous pre­ fertilized Sanadaj-Sirjan basement and creates Qalaylan leucogranites. Younger leucogranites are A2-type and present different evolution path. These rocks generate in a post collisional setting as a result of partial melting of heterogeneous pre-fertilized Sanadaj-Sirjan basement, about 20 Ma later. In post collisional setting, asthenosphere upwelling do to the slab roll back or slab steepening could be a heat source of crust melting and generates the younger leucogranites.

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    APA: Copy

    YAJAM, S., & GHALAMGHASH, J.. (2020). A-type Granites of North Sanandaj-Sirjan zone, new observation, new classification. GEOSCIENCES, 29(114 ), 221-230. SID. https://sid.ir/paper/31502/en

    Vancouver: Copy

    YAJAM S., GHALAMGHASH J.. A-type Granites of North Sanandaj-Sirjan zone, new observation, new classification. GEOSCIENCES[Internet]. 2020;29(114 ):221-230. Available from: https://sid.ir/paper/31502/en

    IEEE: Copy

    S. YAJAM, and J. GHALAMGHASH, “A-type Granites of North Sanandaj-Sirjan zone, new observation, new classification,” GEOSCIENCES, vol. 29, no. 114 , pp. 221–230, 2020, [Online]. Available: https://sid.ir/paper/31502/en

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