Depositional ages and tectonic implications for South Liaohe Group from;Kuandian area in northeastern Liaodong Peninsula, Northeast China

	Depositional ages and tectonic implications for South Liaohe Group from;Kuandian area in northeastern Liaodong Peninsula, Northeast China
	Meng En 3; Liu FuLai ; Liu PingHua ; Liu ChaoHui ; Shi JianRong ; Kong QingBo 1; Lian Tao 1
刊名	ACTA PETROLOGICA SINICA
	2013
卷号	29 期号:7 页码:2465-2480
关键词	Kuandian South Liaohe Group Zircon U-Pb chronology Depositional age Tectonic setting
ISSN号	1000-0569
英文摘要	South Liaohe Group widely occurred in Kuandian area of northeastern Liaodong Peninsula. LA-ICP-MS zircon U-Pb ages and micro trace-elements composition for the biotite-quartz schist, tourmaline-bearing leucoleptite and granitic gneiss from this group were carried out with the aim of restricting the ages of the protolith and metamorphism and the tectonic nature of the Jiao-Liao-ji Belt. The cathodoluminescence (CL) images show that the grain could be divided into three groups, i.e., one group with features of showing low luminescence (cinereous) and structureless, one group with a structureless core surrounded by a cinereous rim, similar to grains of the former group, and the final ones with cores displaying striped absorption or fine-scale oscillatory growth zoning. The trace-element results suggest that the first group have low Th (51. 09 x 10(-6) similar to 85. 15 x 10(-6)) and Th/U ratios (0. 06 similar to 0.07), indicating a metamorphic origin, the second ones have high Th (97. 68 x 10(-6) similar to 219.7 x 10(-6)) and Th/U ratios (0. 21 similar to 0. 27), implying a magmatic origin, and the last ones show higher Th (249. 6 similar to 469.4 x 10(-6)) and Th/U (0. 60 similar to 0. 74), suggesting a typical magmatic origin. The dating results show that the Pb-207/Pb-206 ages of the two former ranging from 1878Ma to 1903Ma (peak at 1885Ma) and from 2011Ma to 2043Ma (peak at 2035Ma), respectively, suggesting that the protoliths of the South Liaohe Group was deposited at some time after 2035Ma and the peak metamorphism occurred at 1885Ma. Besides, the ages of the third ones vary from 2082Ma to 3285Ma, mainly consistent with the formation of regionally distributed granitoids and coeval volcanic rocks in the Jiao-Liao-Ji Belt and the granitoids of the basement, suggesting that these rocks provided the major component of the provenance for the South Liaohe Group. These new zircons ages for the South Liaohe Group and recent data for the Liaoji granite, combined with lithological, structural and metamorphic considerations, indicate that South Liaohe Group from Kuandian area could form under an extensional environment.
学科主题	前寒武纪地质
WOS关键词	ZIRCON U-PB ; PALEOPROTEROZOIC CRUSTAL EVOLUTION ; EASTERN ; LIAONING-PROVINCE ; LA-ICP-MS ; ISOTOPIC CONSTRAINTS ; JIAOBEI TERRANE ; JI ; BELT ; PRESSURE METAMORPHISM ; SHANDONG PENINSULA ; YEONGNAM MASSIF
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000322926000015
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40185]
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.Liaoning Bur Geol & Mineral Explorat & Dev, Geol Survey Team 7, Dandong 118003, Peoples R China. 3.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Meng En,Liu FuLai,Liu PingHua,et al. Depositional ages and tectonic implications for South Liaohe Group from;Kuandian area in northeastern Liaodong Peninsula, Northeast China[J]. ACTA PETROLOGICA SINICA,2013,29(7):2465-2480.
APA	Meng En.,Liu FuLai.,Liu PingHua.,Liu ChaoHui.,Shi JianRong.,...&Lian Tao.(2013).Depositional ages and tectonic implications for South Liaohe Group from;Kuandian area in northeastern Liaodong Peninsula, Northeast China.ACTA PETROLOGICA SINICA,29(7),2465-2480.
MLA	Meng En,et al."Depositional ages and tectonic implications for South Liaohe Group from;Kuandian area in northeastern Liaodong Peninsula, Northeast China".ACTA PETROLOGICA SINICA 29.7(2013):2465-2480.