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Neoproterozoic-Early Cambrian tectono-magmatic evolution of the Central Iranian terrane, northern margin of Gondwana: Constraints from detrital zircon U-Pb and Hf-O isotope studies

文献类型：期刊论文

作者Honarmand, Maryam1,2; Li, Xian-Hua2; Nabatian, Ghasem3; Rezaeian, Mahnaz1; Etemad-Saeed, Najmeh1
刊名GONDWANA RESEARCH
出版日期2016-09-01
卷号37页码:285-300
关键词Detrital Zircon U-pb Age Hf And o Isotopes Peri-gondwana Iran
DOI10.1016/j.gr.2016.05.007
文献子类Article
英文摘要U-Pb dating and oxygen and Lu-Hf isotope analyses are applied to similar to 400 detrital zircon grains from the Neoproterozoic-Cambrian Kahar, Bayandor and Zaigun sandstones. The results reveal the evolutionary history of the Central Iranian continental crust in the northern margin of Gondwana during the Neoproterozoic-Cambrian. The U-Pb dating produces major peaks of crystallization ages at 0.5-0.7 Ga and minor peaks around the Tonian, Paleoproterozoic and Neoarchean. The zircon population in the Zaigun sandstone is dominated by long-transported grains and exhibits slightly different zircon distribution patterns than those from the older Kahar and Bayandor units. The zircon population ages and Hf isotopes of the Zaigun sample are very similar to the Neoproterozoic-Early Palaeozoic siliciclastic units in the Arabian Nubian shield (ANS) and Turkey, which suggests the late to post-Pan-African unroofing of the Afro-Arabia realm as the main process for detritus accumulation in Central Iran during the early Palaeozoic. A significant proportion of the Tonian-aged zircons (similar to 64%) in the Kahar and Bayandor samples show positive epsilon Hf(t) values, whereas those with late Cryogenian-Ediacaran ages have high delta O-18 and variable epsilon Hf-(t) values (similar to-30%. to + 17%.), suggesting that the crustal evolution of provenance of the Tonian-aged zircons commenced in an island arc setting and continued in an active continental margin. All the samples contain pre-Neoproterozoic zircons that are ca 1.9-2.3 Ga or 2.5-3.2 Ga, which are much older than the known Neoproterozoic igneous rocks in Iran and are more consistent with pre-Neoproterozoic igneous-metamorphic rocks in the eastern ANS and northern Africa. These ages support the eastern sector of the Afro-Arabia margin as a provenance for the detrital zircons in the oldest sedimentary sequences of Iran during the late Neoproterozoic-Cambrian. The Hf model ages of zircons with mantle-like delta O-18 values suggest that a significant amount of continental crust in the provenance of the detrital zircons was generated at around 1.0-2.0 and 3.0-3.5 Ga, likely by mantle-derived mafic magmas, and subsequently reworked during crustal differentiation into younger, more felsic crust with varying crustal residence times. (C) 2016 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
WOS关键词ARABIAN-NUBIAN SHIELD ; EAST-AFRICAN OROGEN ; ARCHEAN CRUSTAL EVOLUTION ; SOUTHERN MENDERES MASSIF ; WESTERN ANTI-ATLAS ; SAUDI-ARABIA ; CONTINENTAL-CRUST ; LU-HF ; PROTEROZOIC OPHIOLITES ; SAHARAN METACRATON
WOS研究方向Geology
语种英语
WOS记录号WOS:000384703200018
资助机构State Key Laboratory of Lithospheric Evolution in Chinese Academy of Sciences(201503) ; State Key Laboratory of Lithospheric Evolution in Chinese Academy of Sciences(201503) ; State Key Laboratory of Lithospheric Evolution in Chinese Academy of Sciences(201503) ; State Key Laboratory of Lithospheric Evolution in Chinese Academy of Sciences(201503)
源URL[http://ir.iggcas.ac.cn/handle/132A11/53304]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位1.Inst Adv Studies Basic Sci, Dept Earth Sci, POB 45195-1159, Zanjan, Iran
2.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
3.Univ Zanjan, Fac Sci, Dept Geol, Zanjan, Iran
推荐引用方式
GB/T 7714		 Honarmand, Maryam,Li, Xian-Hua,Nabatian, Ghasem,et al. Neoproterozoic-Early Cambrian tectono-magmatic evolution of the Central Iranian terrane, northern margin of Gondwana: Constraints from detrital zircon U-Pb and Hf-O isotope studies[J]. GONDWANA RESEARCH,2016,37:285-300.
APA Honarmand, Maryam,Li, Xian-Hua,Nabatian, Ghasem,Rezaeian, Mahnaz,&Etemad-Saeed, Najmeh.(2016).Neoproterozoic-Early Cambrian tectono-magmatic evolution of the Central Iranian terrane, northern margin of Gondwana: Constraints from detrital zircon U-Pb and Hf-O isotope studies.GONDWANA RESEARCH,37,285-300.
MLA Honarmand, Maryam,et al."Neoproterozoic-Early Cambrian tectono-magmatic evolution of the Central Iranian terrane, northern margin of Gondwana: Constraints from detrital zircon U-Pb and Hf-O isotope studies".GONDWANA RESEARCH 37(2016):285-300.

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来源：地质与地球物理研究所

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