Origin, age and petrogenesis of barren (low-grade) granitoids from the Bezenjan-Bardsir magmatic complex, southeast of the Urumieh-Dokhtar magmatic belt, Iran

doi:10.1016/j.oregeorev.2018.10.008

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Origin, age and petrogenesis of barren (low-grade) granitoids from the Bezenjan-Bardsir magmatic complex, southeast of the Urumieh-Dokhtar magmatic belt, Iran
	Sepidbar, Fatemeh 1; Ao, Songjian 2; Palin, Richard M.3; Li, Qiu-Li 2; Zhang, Zhaofeng 4
刊名	ORE GEOLOGY REVIEWS
	2019
卷号	104 页码:132-147
关键词	Normal arc magmatism Bardsir-Bezenjan magmatic complex Barren magma Partial melting
ISSN号	0169-1368
DOI	10.1016/j.oregeorev.2018.10.008
英文摘要	The Bezenjan-Bardsir magmatic complex (BBMC), situated at the southeastern part of the Urumieh-Dokhtar magmatic belt, includes a thick pile of volcanic rocks intruded by younger granitoids. The granitoids have granodioritic to quartz-monzonitic composition, while volcanic rocks are petrologically classified as basaltic andesite, andesite, dacite, rhyodacite, and rhyolite. In this study, U-Pb zircon geochronology, whole-rock geochemistry, and Sr-Nd isotopic analyses were performed on a wide range of granitoids exposed within the BBMC. This geochronology indicates that barren magmatism occurred during the Middle to Late Oligocene (29-23 Ma), followed by large-scale Cu mineralization during the Late Miocene. These BBMC rocks have strong depletions in Nb (2.5-17.3 ppm) and enrichments in light rare earth elements and large ion lithophile elements compared to N-MORB. Their normal calc-alkaline arc geochemical signature (low Sr/Y ratio of almost < 55), negative Eu anomalies (Eu/Eu* = 0.6-1), enrichment in HFSE and the negative to positive epsilon Nd (t) values of -1.23 to + 3.17, the Nd model ages (0.43-0.72 Ga) and radiogenic Sr isotope signatures (Sr-87/Sr-86 = 0.7048-0.7063) suggest generation in a subduction zone setting; however, productive rocks elsewhere within the UDMB exhibit adakite-like talc-alkaline magmatic characteristics (high Sr and Sr/Y, but low Y). The BBMC igneous rocks show low Sr/Y (14.6-45.2), zircon Ce-(IV)/Ce-(III) (12-703), and Eu/Eu* (0.08-0.64) ratios, negative to slightly positive Eu anomalies, and enrichment in HFSE and 87Sr/86Sr, in agreement with other barren-type magmas through the UDMB. An integrated geochemical, petrological, and tectonic model suggests that barren magmatism in the BBMC was likely associated with partial melting of juvenile lower crust (amphibolite) due to northwestward subduction of the Neo-Tethys oceanic lithosphere, whereas productive adakitic rocks within the UDMB formed by partial melting of thickened lower crust (garnet-amphibolite).
资助项目	National Natural Science Foundation of China[41472192]
WOS关键词	PORPHYRY COPPER-DEPOSITS ; ZIRCON U-PB ; TRACE-ELEMENT COMPOSITION ; SLAB-DERIVED MELTS ; CALC-ALKALINE ; TECTONIC EVOLUTION ; PLUTONIC COMPLEX ; MANTLE WEDGE ; ARC MAGMAS ; FLARE-UP
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000460710600009
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/90908]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Sepidbar, Fatemeh
作者单位	1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Sch Earth Sci, Wuhan 430047, Hubei, Peoples R China 2.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Colorado Sch Mines, Dept Geol & Geol Engn, Golden, CO 80401 USA 4.Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Sepidbar, Fatemeh,Ao, Songjian,Palin, Richard M.,et al. Origin, age and petrogenesis of barren (low-grade) granitoids from the Bezenjan-Bardsir magmatic complex, southeast of the Urumieh-Dokhtar magmatic belt, Iran[J]. ORE GEOLOGY REVIEWS,2019,104:132-147.
APA	Sepidbar, Fatemeh,Ao, Songjian,Palin, Richard M.,Li, Qiu-Li,&Zhang, Zhaofeng.(2019).Origin, age and petrogenesis of barren (low-grade) granitoids from the Bezenjan-Bardsir magmatic complex, southeast of the Urumieh-Dokhtar magmatic belt, Iran.ORE GEOLOGY REVIEWS,104,132-147.
MLA	Sepidbar, Fatemeh,et al."Origin, age and petrogenesis of barren (low-grade) granitoids from the Bezenjan-Bardsir magmatic complex, southeast of the Urumieh-Dokhtar magmatic belt, Iran".ORE GEOLOGY REVIEWS 104(2019):132-147.