气候变化领域集成服务门户(CCPortal): Repeated magmatic buildup and deep “hot zones” in continental evolution: The Cadomian crust of Iran

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DOI	10.1016/j.epsl.2019.115989
	Repeated magmatic buildup and deep “hot zones” in continental evolution: The Cadomian crust of Iran
	Shafaii Moghadam H.; Li Q.L.; Griffin W.L.; Stern R.J.; Ishizuka O.; Henry H.; Lucci F.; O'Reilly S.Y.; Ghorbani G.
发表日期	2020
ISSN	0012821X
卷号	531
英文摘要	The generation and differentiation of continental crust by arc magmatism is strongly influenced by episodes of high magmatic flux (“flare-ups”). Magmatic flare-ups encourage the development of deep crustal hot zones where magmatic differentiation and density stratification combine to form the upper felsic and lower mafic continental crust. Such processes, which are responsible for the construction of continental arc crust, are prolonged events, which build a ∼30-40 km arc crust over tens of million years (∼100 Myr). New zircon U-Pb data reveal that the construction of Cadomian crust from NE Iran occurred over ∼15 ± 0.3 Myr. However, compiled zircon U-Pb ages reveal a prolonged magmatic flare-up of ∼45 Myr; ∼570 to 525 Ma. Basement outcrops in NE Iran expose lower- and upper crust that show how magmatic-geochemical differentiation occurred deep beneath a Cadomian continental arc in a crustal hot zone. Isotopic data for igneous rocks produced during this 45 Myr episode reveal interactions between mantle-derived melts and old continental crust. Synthesis of new and published data indicates that this type of interaction is common during periods of high magmatic fluxes. Our results indicate that differentiation of mafic melts in the lower crust during prolonged magmatic flare-ups plays a key role in building a stratified continental crust. © 2019
关键词	Cadomian continental crust hot zone Iran magmatic flare-up
英文关键词	Binary alloys; Igneous rocks; Silicate minerals; Zircon; Cadomian; Continental crusts; Hot zone; Iran; magmatic flare-up; Lead alloys; continental arc; continental crust; differentiation; felsic rock; mafic rock; magmatism; outcrop; stratification; uranium-lead dating; Iran
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202884
作者单位	State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; School of Earth Sciences, Damghan University, Damghan, 36716-41167, Iran; Arc Centre of Excellence for Core to Crust Fluid Systems, GEMOC ARC National Key Centre, Dept. of Earth and Planetary Sciences, Macquarie UniversityNSW 2109, Australia; Geosciences Dept., University of Texas at Dallas, Richardson, TX 75083-0688, United States; Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushimacho, Yokosuka, Kanagawa 237-0061, Japan; Geological Survey of Japan/AIST, Tsukuba, Ibaraki 305-8567, Japan; Dipartimento di Scienze, Sezione Scienze Geologiche, Università “Roma Tre”, Rome, 1-00146, Italy
推荐引用方式 GB/T 7714	Shafaii Moghadam H.,Li Q.L.,Griffin W.L.,等. Repeated magmatic buildup and deep “hot zones” in continental evolution: The Cadomian crust of Iran[J],2020,531.
APA	Shafaii Moghadam H..,Li Q.L..,Griffin W.L..,Stern R.J..,Ishizuka O..,...&Ghorbani G..(2020).Repeated magmatic buildup and deep “hot zones” in continental evolution: The Cadomian crust of Iran.Earth and Planetary Science Letters,531.
MLA	Shafaii Moghadam H.,et al."Repeated magmatic buildup and deep “hot zones” in continental evolution: The Cadomian crust of Iran".Earth and Planetary Science Letters 531(2020).