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Juvenile crust and mantle sources for the Nasrand intrusive rocks, the central Urumieh-Dokhtar magmatic arc, Iran: Insights from elemental and isotopic geochemistry

文献类型：期刊论文

作者Sepahvand, Farzaneh1; Tahmasbi, Zahra1; Sarjoughian, Fatemeh2; Ebrahimi, Mohammad3; Ling, Wenli4; Zhang, Zhiyong5,6; Esmaeili, Rasoul3,5,6
刊名GEOLOGICAL JOURNAL
出版日期2022-03-08
页码23
ISSN号0072-1050
关键词Ardestan granitoid rocks Iran petrogenesis subduction Urumieh-Dokhtar magmatic arc
DOI10.1002/gj.4431
英文摘要The Oligocene Nasrand intrusive rocks (NIRs), located in the central part of the Urumieh-Dokhtar magmatic arc, are mainly composed of granite and subordinate diorite and gabbro. These rocks are characterized by the enrichment of light rare earth elements (LREEs), Nb-Ta negative anomalies, and high LILE/HFSE, suggesting a subduction-related origin. The felsic rocks with granite compositions have high SiO2 content (69.77-77.88 wt.%), low Mg# (0.02-0.43), low Nb/Ta, and Zr/Hf (Avg: 12.53, and 33.08, respectively). The initial Sr-87/Sr-86 ratio and epsilon Nd-(t) values in felsic rocks range from 0.70577 to 0.70576 and 0.4 to -0.3, respectively. These data suggest that these felsic rocks originated from juvenile crust by heat rising from basaltic magmas in an orogenic setting. The mafic-intermediate rocks and dikes are gabbro, gabbroic diorite, and monzodiorite, with low SiO2 content (48.08-56.11 wt.%) and high Mg# (0.37-0.68), with average ratios of Nb/Ta and Zr/Hf are 27.88 and 39.84, respectively. The initial Sr-87/Sr-86 ratio and epsilon Nd-(t) values for mafic-intermediate rocks and dikes are 0.70583 to 0.70476 and -0.1 to +2.6, respectively. These characteristics indicate magma from a mantle source that had undergone minor mixing with juvenile crust. It seems mantle-derived juvenile magma underplating played an important role in the crustal growth in the Urumieh-Dokhtar magmatic belt during the Ediacaran to Early Cambrian, relative to other time frames.
WOS关键词ZIRCON U-PB ; PORPHYRY COPPER-DEPOSITS ; I-TYPE GRANITOIDS ; FOLD-THRUST BELT ; TRACE-ELEMENT ; CONTINENTAL GROWTH ; OROGENIC BELT ; CALC-ALKALINE ; MICROGRANULAR ENCLAVES ; RELATIVE CONTRIBUTIONS
资助项目National Natural Science Foundation of China[91755102] ; National Natural Science Foundation of China[92055213] ; National Natural Science Foundation of China[91855207]
WOS研究方向Geology
语种英语
出版者WILEY
WOS记录号WOS:000766000900001
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
源URL[http://ir.iggcas.ac.cn/handle/132A11/104958]  
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Tahmasbi, Zahra
作者单位1.Lorestan Univ, Dept Geol, Fac Sci, Lorestan, Iran
2.Univ Kurdistan, Dept Earth Sci, Fac Sci, Sanandaj, Iran
3.Univ Zanjan, Dept Geol, Fac Sci, Zanjan, Iran
4.China Univ Geosci, Fac Earth Sci, Wuhan, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
6.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Sepahvand, Farzaneh,Tahmasbi, Zahra,Sarjoughian, Fatemeh,et al. Juvenile crust and mantle sources for the Nasrand intrusive rocks, the central Urumieh-Dokhtar magmatic arc, Iran: Insights from elemental and isotopic geochemistry[J]. GEOLOGICAL JOURNAL,2022:23.
APA Sepahvand, Farzaneh.,Tahmasbi, Zahra.,Sarjoughian, Fatemeh.,Ebrahimi, Mohammad.,Ling, Wenli.,...&Esmaeili, Rasoul.(2022).Juvenile crust and mantle sources for the Nasrand intrusive rocks, the central Urumieh-Dokhtar magmatic arc, Iran: Insights from elemental and isotopic geochemistry.GEOLOGICAL JOURNAL,23.
MLA Sepahvand, Farzaneh,et al."Juvenile crust and mantle sources for the Nasrand intrusive rocks, the central Urumieh-Dokhtar magmatic arc, Iran: Insights from elemental and isotopic geochemistry".GEOLOGICAL JOURNAL (2022):23.

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来源：地质与地球物理研究所

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