Palaeoproterozoic Khondalite Belt in the western North China Craton: New evidence from SHRIMP dating and Hf isotope composition of zircons from metamorphic rocks in the Bayan Ul-Helan Mountains area

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	Palaeoproterozoic Khondalite Belt in the western North China Craton: New evidence from SHRIMP dating and Hf isotope composition of zircons from metamorphic rocks in the Bayan Ul-Helan Mountains area
	Dong, CY (Dong ChunYan); Liu, DY (Liu DunYi); Li, JJ (Li JunJian); Wan, YS (Wan YuSheng); Zhou, HY (Zhou HongYing); Li, CD (Li ChengDong); Yang, YH (Yang YueHeng); Xie, LW (Xie LieWen)
刊名	CHINESE SCIENCE BULLETIN
	2007
卷号	52 期号:21 页码:2984-2994
关键词	Khondalite Belt Palaeoproterozoic SHRIMP dating Helan Mountains North China Craton
ISSN号	1001-6538
英文摘要	Zircom U-Pb age and Hf isotope analyses were made on gneissic granite and garnet-mica two-feldspar gneiss from the Helanshan Group in the Bayan Ul-Helan Mountains area, the western block of the North China Craton (NCC). Zircons from the gneissic granite commonly show core-mantle-rim structures, with magmatic core, metamorphic mantle and rim having ages of 2323 +/- 20 Ma, 1923 +/- 28 Ma and 1856 +/- 12 Ma, respectively. The core, mantle and rim show similar Hf isotope compositions, with single-stage depleted mantle model ages (T (DM1)) of 2455 to 2655 Ma (19 analyses). Most of the detrital zircons from the garnet-mica two-feldspar paragneiss have a concentrated U-Pb age distribution, with a weighted mean Pb-207/Pb-206 age of 1978 +/- 17 Ma. A few detrital zircons are older (2871 to 2469 Ma). The age for metamorphic overgrown rim was not determined because of strong Pb loss due to their high U content. The zircons show large variation in Hf isotope composition, with T (DM1) ages of 1999 to 3047 Ma. In combination with previous studies, the main conclusions are as follows (1) protolith of the khondalite series in the Helanshan Group formed during Palaeoproterozoic rather than the Archaean as previously considered; (2) The results lend support to the contention that there is a huge Palaeoproterozoic Khondalite (metasedimentary) Belt between the Yinshan Mountains Block and the Ordos Block in the Western Block of NCC; (3) The widely-distributed bodies of early Palaeoproterozoic orthogneisses in the Khondalite Belt might be one of the important sources for detritus material in the khondalite series; (4) Collision between the Yinshan Block, the Ordos Block and the Eastern Block occurred in the same tectonothermal event of late Palaeoproterozoic, resulting in the final assembly of the NCC.
学科主题	地质年代学
WOS关键词	ULTRAHIGH-PRESSURE ECLOGITE ; METASEDIMENTARY ROCKS ; TECTONIC EVOLUTION ; PB GEOCHRONOLOGY ; DETRITAL ZIRCONS ; SOUTH CHINA ; LU-HF ; CONSTRAINTS ; COMPLEX ; AGE
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000250463400016
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38488]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China Beijing SHRIMP Ctr, Beijing 100037, Peoples R China China Geol Survey, Tianjin Inst Geol & Mineral Resources, Tianjin 300170, Peoples R China Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Dong, CY ,Liu, DY ,Li, JJ ,et al. Palaeoproterozoic Khondalite Belt in the western North China Craton: New evidence from SHRIMP dating and Hf isotope composition of zircons from metamorphic rocks in the Bayan Ul-Helan Mountains area[J]. CHINESE SCIENCE BULLETIN,2007,52(21):2984-2994.
APA	Dong, CY .,Liu, DY .,Li, JJ .,Wan, YS .,Zhou, HY .,...&Xie, LW .(2007).Palaeoproterozoic Khondalite Belt in the western North China Craton: New evidence from SHRIMP dating and Hf isotope composition of zircons from metamorphic rocks in the Bayan Ul-Helan Mountains area.CHINESE SCIENCE BULLETIN,52(21),2984-2994.
MLA	Dong, CY ,et al."Palaeoproterozoic Khondalite Belt in the western North China Craton: New evidence from SHRIMP dating and Hf isotope composition of zircons from metamorphic rocks in the Bayan Ul-Helan Mountains area".CHINESE SCIENCE BULLETIN 52.21(2007):2984-2994.