Esna-Ashari, Amir and Tiepolo, Massimo and Valizadeh, Mohammed-Vali and Hassanzadeh, Jamshid and Sepahi, Ali-Asghar (2012) Geochemistry and zircon U–Pb geochronology of Aligoodarz granitoid complex, Sanandaj-Sirjan Zone, Iran. Journal of Asian Earth Sciences, 43 (1). pp. 11-22. ISSN 1367-9120 http://resolver.caltech.edu/CaltechAUTHORS:20120117-101006997
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The Aligoodarz granitoid complex (AGC) is located in the Sanandaj-Sirjan Zone (SSZ), western Iran and consists of quartz-diorites, granodiorites and subordinate granites. Whole rock major and trace element data mostly define linear trends on Harker diagrams suggesting a cogenetic origin of the different rock types. (^(87)Sr/^(86)Sr)i and eNdt ratios are in the ranges 0.7074–0.7110 and -3.56 to -5.50, respectively. The trace elements and Sr–Nd isotopic composition suggest that the granitoids from the AGC are similar to crustal derived I-type granitoids of continental arcs. The whole rock suite was produced by assimilation and fractional crystallization starting from a melt with intermediate composition likely possessing a mantle component. In situ zircon U–Pb data on the granites with LA-ICP-MS yield a crystallization age of ~165 Ma. Inherited grains spanning in age from ~180 Ma up to 2027 Ma were also found and confirm that assimilation of country rock has occurred. Chemical and chronological data on the AGC were compared with those available for other granitoid complexes of the central SSZ (e.g., Dehno, Boroujerd and Alvand). The comparison reveals that in spite of the different origins that have been proposed, all these granitoid complexes are likely genetically related. They share many chemical features and are derived from crustal melts with minor differences. Alvand granites have the most peculiar compositions most likely related to the presence of abundant pelitic component. All these intrusions are coeval and reveal the presence of an extensive magmatic activity in the central sector of the SSZ during middle Jurassic.
|Additional Information:||© 2011 Elsevier Ltd. Received 23 February 2011; Received in revised form 21 August 2011; Accepted 5 September 2011; Available online 10 September 2011. The first author acknowledges the members of the National Research Council of Italy (CNR) for their hospitability and preparing the analytical facilities during his stay in Pavia, Italy. This manuscript benefited from constructive reviews by K.N. Pang, Bor-ming Jahn and an anonymous reviewer. This study is financially supported by the Iran National Science Foundation (INSF), Grant No. 87020210, and CNR, Istituto di Geoscienze e Georisorse, UOS Pavia, Italy.|
|Subject Keywords:||Aligoodarz; Sanandaj-Sirjan Zone; Zircon U–Pb dating; Geochemistry; Granitoid; Arc magmatism|
|Official Citation:||Amir Esna-Ashari, Massimo Tiepolo, Mohammad-Vali Valizadeh, Jamshid Hassanzadeh, Ali-Asghar Sepahi, Geochemistry and zircon U–Pb geochronology of Aligoodarz granitoid complex, Sanandaj-Sirjan Zone, Iran, Journal of Asian Earth Sciences, Volume 43, Issue 1, 1 January 2012, Pages 11-22, ISSN 1367-9120, 10.1016/j.jseaes.2011.09.001.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||17 Jan 2012 22:47|
|Last Modified:||17 Jan 2012 22:47|
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