Comparison of metamorphic zircons from granulite xenoliths and granulite terrain in northern North China Craton

doi:10.1016/j.precamres.2017.05.019

	Comparison of metamorphic zircons from granulite xenoliths and granulite terrain in northern North China Craton
	Hu, Jun 1,2; Jiang, Neng 1,2; Fan, Wenbo 1,2; Zhang, Shuangquan 3
刊名	PRECAMBRIAN RESEARCH
	2017-12-01
卷号	303 页码:414-427
关键词	Metamorphic Zircons Granulite Xenoliths Terrain North China Craton
ISSN号	0301-9268
DOI	10.1016/j.precamres.2017.05.019
文献子类	Article
英文摘要	We conduct a study of petrography, geochronology, trace element and Hf isotope compositions on zircons from granulite terrain and granulite xenoliths in the Zhangjiakou region, northern North China Craton. Most zircons from both types of granulite have core-rim structure in their CL images. All the magmatic zircon cores yield essentially identical similar to 2.5 Ga ages, whereas metamorphic zircons yield ages of similar to 1.85 Ga and 120-140 Ma, respectively. Most the similar to 1.85 Ga metamorphic zircons have Th/U ratios lower than 0.4 with a range of 0.01 to 0.63. However, the range of Th/U ratios of Mesozoic (120-140 Ma) metamorphic zircons (0.12-3.48) overlaps that of the magmatic zircons (0.12-2.44). The Mesozoic and similar to 1.85Ga metamorphic zircons have REE patterns consistent with magmatic zircons, except that the similar to 1.85 Ga ones show less enrichments and much less negative Eu anomalies than those of magmatic zircons. Therefore, Th/U ratios and the REE patterns cannot be used to distinguish metamorphic zircons from magmatic ones. The similar to 1.85 Ga metamorphic zircons, however, have lower formation temperatures, oxygen fugacity and Lu-176/Hf-177 ratios than the Mesozoic ones. We speculate that the similar to 1.85 Ga metamorphic zircons represent newly grown zircons coexisting with garnets and melt/fluid while the Mesozoic metamorphic zircons were formed quickly without the presence of garnet. The Mesozoic metamorphic zircons vary in their origins; some of these zircons were metamorphic newly grown while the others experienced recrystallization from a U-depleted melt/fluid. Our results suggest that P-T conditions, the melt/fluid and oxygen fugacity play important roles in controlling the trace element distribution and Hf isotope compositions of metamorphic zircons in the granulites. (c) 2017 Elsevier B.V. All rights reserved.
WOS关键词	U-PB AGES ; LIAO-JI BELT ; MESOZOIC EXTENSIONAL TECTONICS ; PRESSURE MAFIC GRANULITE ; SINO-KOREAN CRATON ; WESTERN BLOCK ; CONTINENTAL-CRUST ; DETRITAL ZIRCONS ; CORE COMPLEX ; LU-HF
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000423004300022
资助机构	National Natural Science Foundation of China(41573032) ; National Natural Science Foundation of China(41573032) ; National Natural Science Foundation of China(41573032) ; National Natural Science Foundation of China(41573032) ; National Natural Science Foundation of China(41573032) ; National Natural Science Foundation of China(41573032) ; National Natural Science Foundation of China(41573032) ; National Natural Science Foundation of China(41573032) ; National Natural Science Foundation of China(41573032) ; National Natural Science Foundation of China(41573032) ; National Natural Science Foundation of China(41573032) ; National Natural Science Foundation of China(41573032) ; National Natural Science Foundation of China(41573032) ; National Natural Science Foundation of China(41573032) ; National Natural Science Foundation of China(41573032) ; National Natural Science Foundation of China(41573032)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/82450]
专题	中国科学院地质与地球物理研究所
通讯作者	Jiang, Neng
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Carleton Univ, Dept Earth Sci, Ottawa, ON, Canada
推荐引用方式 GB/T 7714	Hu, Jun,Jiang, Neng,Fan, Wenbo,et al. Comparison of metamorphic zircons from granulite xenoliths and granulite terrain in northern North China Craton[J]. PRECAMBRIAN RESEARCH,2017,303:414-427.
APA	Hu, Jun,Jiang, Neng,Fan, Wenbo,&Zhang, Shuangquan.(2017).Comparison of metamorphic zircons from granulite xenoliths and granulite terrain in northern North China Craton.PRECAMBRIAN RESEARCH,303,414-427.
MLA	Hu, Jun,et al."Comparison of metamorphic zircons from granulite xenoliths and granulite terrain in northern North China Craton".PRECAMBRIAN RESEARCH 303(2017):414-427.