Mid-Late Triassic metamorphic event for Changhai meta-sedimentary rocks from the SE Jiao-Liao-Ji Belt, North China Craton: Evidence from monazite U-Th-Pb and muscovite Ar-Ar dating

doi:10.1016/j.jseaes.2014.05.001

	Mid-Late Triassic metamorphic event for Changhai meta-sedimentary rocks from the SE Jiao-Liao-Ji Belt, North China Craton: Evidence from monazite U-Th-Pb and muscovite Ar-Ar dating
	Liu, Fulai 3; Wang, Fang ; Liou, J. G.; Meng, En ; Liu, Jianhui ; Yang, Hong ; Xiao, Lingling ; Cai, Jia ; Shi, Jianrong
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2014
卷号	94 页码:205-225
关键词	Jiao-Liao-Ji Belt Changhai metamorphic complex Monazite U-Th-Pb dating Muscovite Ar-Ar dating Mid-Late Triassic metamorphism
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2014.05.001
英文摘要	The precise constraints on the timing of metamorphism of the Changhai metamorphic complex is of great importance considering the prolonged controversial issue of the north margin and the extension of the Sulu-Dabie HP-UHP Belt. While the monazite U-Th-Pb and muscovite Ar-40/Ar-39 techniques are widely accepted as two of the most powerful dating tools for revealing the thermal histories of medium-low grade metamorphic rocks and precisely constraining the timing of metamorphism. The Changhai metamorphic complex at the SE Jiao-Liao-Ji Belt, North China Craton consists of a variety of pelitic schist and Grt-Ky-bearing paragneiss, and minor quartzite and marble. Analyses of mineral inclusions and back-scattered electric (BSE) images of monazites, combined with LA-ICP-MS U-Th-Pb ages for monazites and Ar-40/Ar-39 ages for muscovites, provide evidence of the origin and metamorphic age of the Changhai metamorphic complex. Monazites separates from various Grt-Mus schists and Grt-Ky-St-Mus paragneisses exhibit homogeneous BSE images from cores to rims, and contain inclusion assemblages of Grt + Mus + Qtz +/- Ctd +/- Ky in schist, and Grt + Ky + St + Mus + Pl + Kfs + Qtz inclusions in paragneiss. These inclusion assemblages are very similar to matrix minerals of host rocks, indicating they are metamorphic rather than inherited or detrital in origin. LA-ICP-MS U-Th-Pb dating reveals that monazites of schist and paragneiss have consistent Pb-206/U-238 ages ranging from 228.1 +/- 3.8 to 218.2 +/- 3.7 Ma. In contrast, muscovites from various schists show slightly older Ar-40/Ar-39 plateau ages of 236.1 +/- 1.5 to 230.2 +/- 1.2 Ma. These geochronological and petrological data conclude that the pelitic sediments have experienced a metamorphic event at the Mid-Late Triassic (236.1-218.2 Ma) rather than the (1950-1850 Ma), commonly regarded as the Precambrian basement for the Jiao-Liao-Ji Belt. Hence, the Changhai metamorphic complex should be considered as a discrete lithotectonic group. This newly recognized Mid-Late Triassic metamorphic event (236.1-218.2 Ma) for the Changhai metamorphic complex is coeval with the HP-UHP metamorphic event (235-220 Ma) for Sulu-Dabie rocks. This leads us to speculate that the metamorphism of the Changhai complex belt along the SE margin of the North China Craton was genetically related to the Mid-Late Triassic collision of the North China and South China cratons. By the same token, the Sulu-Dabie HP-UHP Belt may have extended through Yantai, and the southern Yellow Sea, and to the southern side of the Changhai metamorphic complex. (C) 2014 Elsevier Ltd. All rights reserved.
学科主题	变质岩岩石学
WOS关键词	PRESSURE PELITIC GRANULITES ; SULU OROGENIC BELT ; EAST-CENTRAL CHINA ; RIVER SHEAR ZONE ; ZIRCON GEOCHRONOLOGY ; DETRITAL ZIRCONS ; SOUTH CHINA ; TECTONIC IMPLICATIONS ; MINERAL INCLUSIONS ; CRUSTAL EVOLUTION
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000343351000016
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40490]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 2.Liou, J. G.] Stanford Univ, Dept Geol & Environm Sci, Stanford, CA 94305 USA 3.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Liu, Fulai,Wang, Fang,Liou, J. G.,et al. Mid-Late Triassic metamorphic event for Changhai meta-sedimentary rocks from the SE Jiao-Liao-Ji Belt, North China Craton: Evidence from monazite U-Th-Pb and muscovite Ar-Ar dating[J]. JOURNAL OF ASIAN EARTH SCIENCES,2014,94:205-225.
APA	Liu, Fulai.,Wang, Fang.,Liou, J. G..,Meng, En.,Liu, Jianhui.,...&Shi, Jianrong.(2014).Mid-Late Triassic metamorphic event for Changhai meta-sedimentary rocks from the SE Jiao-Liao-Ji Belt, North China Craton: Evidence from monazite U-Th-Pb and muscovite Ar-Ar dating.JOURNAL OF ASIAN EARTH SCIENCES,94,205-225.
MLA	Liu, Fulai,et al."Mid-Late Triassic metamorphic event for Changhai meta-sedimentary rocks from the SE Jiao-Liao-Ji Belt, North China Craton: Evidence from monazite U-Th-Pb and muscovite Ar-Ar dating".JOURNAL OF ASIAN EARTH SCIENCES 94(2014):205-225.