Geochemical and isotopic constraints on the role of juvenile crust and magma mixing in the UDMA magmatism, Iran: evidence from mafic microgranular enclaves and cogenetic granitoids in the Zafarghand igneous complex

doi:10.1007/s00531-017-1548-8

	Geochemical and isotopic constraints on the role of juvenile crust and magma mixing in the UDMA magmatism, Iran: evidence from mafic microgranular enclaves and cogenetic granitoids in the Zafarghand igneous complex
	Sarjoughian, Fatemeh 1; Lentz, David 2; Kananian, Ali 3; Ao, Songjian 4; Xiao, Wenjiao 4
刊名	INTERNATIONAL JOURNAL OF EARTH SCIENCES
	2018-04-01
卷号	107 期号:3 页码:1127-1151
关键词	Granitoids Enclaves Juvenile crust Subduction UDMA Iran
ISSN号	1437-3254
DOI	10.1007/s00531-017-1548-8
文献子类	Article
英文摘要	The Zafarghand Igneous Complex is composed of granite, granodiorite, diorite, and gabbro that contain many mafic microgranular enclaves. This complex was emplaced during the late Oligocene (24.6 Ma) to form part of the Urumieh-Dokhtar magmatic arc of Central Iran. The enclaves have spheroidal to elongated/lenticular shapes and are quenched mafic melts in felsic host magma as evidenced by fine-grained sinuous margins and (or) locally transitional and diffuse contacts with the host rocks, as well as having disequilibrium textures. These textures including oscillatory zoning with resorption surfaces on plagioclase, feldspar megacrysts with poikilitic and anti-rapakivi textures, mafic clots, acicular apatites, and small lath-shaped plagioclase in larger plagioclase crystals all indicate that the enclaves crystallized from mafic magma that was injected into and mixing/mingling with the host felsic magma. The studied rocks have calc-alkaline, metaluminous compositions, with an arc affinity. They are enriched in large ion lithophile elements, light rare-earth elements, and depleted in high field strength elements with significant negative Eu anomalies. The Sr-Nd isotopic data for all of the samples are similar and display ISr = 0.705123-0.705950 and epsilon Nd (24.6 Ma) = - 1.04-1.03 with TDM similar to 0.9-1.1 Ga. The host granites and enclaves are of mixed/mingled origin and most probably formed by the interaction between the juvenile lower crust with a basaltic composition and old lower or middle continental crust as a major component and lithospheric mantle as a minor component; this was followed by fractional crystallization and possibly minor crustal assimilation. The source seems to be comprised of about 90-80% of the basaltic magma and about 10-20% of lower/middle-crust-derived magma. Geochemical characteristics indicate that the intrusion of these rocks from a subduction zone setting below the Central Iran micro-continent was related to an active continental margin, although was transitional to a transtensional setting possibly due oblique convergence to slab rollback or break-off.
WOS关键词	SIERRA-NEVADA BATHOLITH ; LACHLAN FOLD BELT ; IONIZATION MASS-SPECTROMETRY ; ARABIA-EURASIA COLLISION ; CALC-ALKALINE GRANITOIDS ; SANANDAJ-SIRJAN ZONE ; S-TYPE GRANITES ; PB ZIRCON AGES ; U-PB ; CONTINENTAL-CRUST
WOS研究方向	Geology
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000427705700016
资助机构	University of Kurdistan(4.64500) ; University of Kurdistan(4.64500) ; National Natural Science Foundation of China(41472192) ; National Natural Science Foundation of China(41472192) ; State Key Laboratory of Lithosphere Evolution(11232240) ; State Key Laboratory of Lithosphere Evolution(11232240) ; NSERC Discovery grant ; NSERC Discovery grant ; University of Kurdistan(4.64500) ; University of Kurdistan(4.64500) ; National Natural Science Foundation of China(41472192) ; National Natural Science Foundation of China(41472192) ; State Key Laboratory of Lithosphere Evolution(11232240) ; State Key Laboratory of Lithosphere Evolution(11232240) ; NSERC Discovery grant ; NSERC Discovery grant ; University of Kurdistan(4.64500) ; University of Kurdistan(4.64500) ; National Natural Science Foundation of China(41472192) ; National Natural Science Foundation of China(41472192) ; State Key Laboratory of Lithosphere Evolution(11232240) ; State Key Laboratory of Lithosphere Evolution(11232240) ; NSERC Discovery grant ; NSERC Discovery grant ; University of Kurdistan(4.64500) ; University of Kurdistan(4.64500) ; National Natural Science Foundation of China(41472192) ; National Natural Science Foundation of China(41472192) ; State Key Laboratory of Lithosphere Evolution(11232240) ; State Key Laboratory of Lithosphere Evolution(11232240) ; NSERC Discovery grant ; NSERC Discovery grant
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/83010]
专题	中国科学院地质与地球物理研究所
通讯作者	Sarjoughian, Fatemeh
作者单位	1.Univ Kurdistan, Dept Earth Sci, Fac Sci, Sanandaj, Iran 2.Univ New Brunswick, Dept Earth Sci, Fredericton, NB E3B 5A3, Canada 3.Univ Tehran, Univ Coll Sci, Dept Geol, Tehran, Iran 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Sarjoughian, Fatemeh,Lentz, David,Kananian, Ali,et al. Geochemical and isotopic constraints on the role of juvenile crust and magma mixing in the UDMA magmatism, Iran: evidence from mafic microgranular enclaves and cogenetic granitoids in the Zafarghand igneous complex[J]. INTERNATIONAL JOURNAL OF EARTH SCIENCES,2018,107(3):1127-1151.
APA	Sarjoughian, Fatemeh,Lentz, David,Kananian, Ali,Ao, Songjian,&Xiao, Wenjiao.(2018).Geochemical and isotopic constraints on the role of juvenile crust and magma mixing in the UDMA magmatism, Iran: evidence from mafic microgranular enclaves and cogenetic granitoids in the Zafarghand igneous complex.INTERNATIONAL JOURNAL OF EARTH SCIENCES,107(3),1127-1151.
MLA	Sarjoughian, Fatemeh,et al."Geochemical and isotopic constraints on the role of juvenile crust and magma mixing in the UDMA magmatism, Iran: evidence from mafic microgranular enclaves and cogenetic granitoids in the Zafarghand igneous complex".INTERNATIONAL JOURNAL OF EARTH SCIENCES 107.3(2018):1127-1151.