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Crystallization Conditions and Mineral Chemistry in the East of Tafresh, Central Iran, with Insights into Magmatic Processes

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Acta Geologica Sinica(English Edition) 2019年第6期93卷 1755-1772页

作者： Davood RAEISI Hassan MRNEJAD Department of Geology Faculty of ScienceUniversity of TehranTehranIran Department of Geology and Environmental Earth Sciences Miami UniversityOxfordOhioUSA

The Tafresh granitoids are located at the central part of the Urumieh-Dokhtar Magmatic Arc(UDMA)in *** rocks,mainly consisting of diorite and granodiorite,were emplaced during the Early *** are composed of varying proportions of plagioclase+K-feldspar+hornblende±quartz±*** diagrams and chemical indices of amphibole phases reveal a calc-alkaline affinity and fall clearly in the crust-mantle mixed source *** estimated pressure,derived from Al in amphibole barometry,is approximately 3 *** granitoids are I-type,metaluminous and belong to the calc-alkaline *** are all enriched in light rare earth elements and large ion lithophile elements,depleted in high field strength elements and display geochemical features typical of subduction-related calc-alkaline arc *** crystal size distribution(CSD)line patterns from the granitoids show a non-straight trend which points to the effect of physical processes during *** presence of numerous mafic enclaves,sieve texture and oscillatory zoning along with the CSD results show that magma mixing in the magma chamber had an important role in the petrogenesis of Tafresh ***,the CSD analysis suggests that the plagioclase crystals were crystallized in a time span of less than 1000 years,which is indicative of shallow depth magma crystallization.

关键词： crust-mantle mixed source I-type subduction crystal size distribution magma mixing Urumieh-Dokhtar Magmatic Arc

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