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North-Central Section - 43rd Annual Meeting (2-3 April 2009)

Paper No. 1
Presentation Time: 8:00 AM

THE ROLE OF PARTIAL MELTING AND CRUSTAL ASSIMILATION IN THE FORMATION OF GRANITIC UNIT OF NAQADEH COMPLEX, SANANDAJ-SIRJAN ZONE, NW IRAN


AMINI, Sadraldin, Geology, Tarbiat Moallem University, Mo. 49, Mofatteh Avenue, Tehran, 15614, Iran, MAZHARI, Seyed Ali, Geology, Tarbiat Moallem University, No. 49, Mofatteh avenue, Tehran, 15614, Iran and GHALAMGHASH, Jalil, Tehran, 15614, Iran, sadramini@yahoo.com

The granitic unit is a component of the Naqadeh plutonic complex, NW of Sanandaj-Sirjan Zone (NW Iran). This unit is composed of high-K calc-alkaline, slightly peraluminous (ASI= 1.12-1.17) evolved monzogranites. These monzogranites have 41.85±0.81 Ma (zircon U–Pb sensitive high-resolution ion microprobe (SHRIMP) age) with two inherited zircon ages of 98.5± 1.7 and 586.6± 13.1 Ma, respectively. The only enclave type consists of quartz-amphibolite enclaves indicating of parental rocks residual. Chemical and isotopic (87Sr/ 86Sr40Ma= 0.708638; åNd40Ma= -4.26) characteristics of monzogranites suggest that they could be derived by partial melting of crustal mafic rocks following by some assimilation of metasedimentary rocks. With regards to inherited zircon age and quartz-amphibolite composition of Naqadeh granite, the old mafic rocks of this complex (Naqadeh dioritic rocks with ~100Ma) can be considered as parental rocks which their partial melting under high water content, and assimilation of produced melt by metasedimentary rocks would lead to generation of Naqadeh granitic unit.

Session No. 6

T16. Geochemical and Isotopic Studies of Rocks, Minerals and Fluids
Thursday, 2 April 2009: 8:00 AM-12:00 PM
Geological Society of America Abstracts with Programs. Vol 41, No. 4, p.11
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