Zircon U-Pb and Hf isotopic studies of basement gneiss and overlying Meso-Neoproterozoic sedimentary rocks from the Changping area, Beijing, and their geological implications.

	Zircon U-Pb and Hf isotopic studies of basement gneiss and overlying Meso-Neoproterozoic sedimentary rocks from the Changping area, Beijing, and their geological implications.
	Ren Rong 1; Han BaoFu 1; Zhang ZhiCheng 1; Li JianFeng 1; Yang YueHeng 2; Zhang YanBin 2
刊名	ACTA PETROLOGICA SINICA
	2011-06-01
卷号	27 期号:6 页码:1721-1745
关键词	North China Craton Precambrian Yan-Liao aulacogen Detrital zircon Sedimentary and crustal evolution
ISSN号	1000-0569
文献子类	Article
英文摘要	Zircon LA-ICP-MS U-Ph and Hf isotopic studies of the Neoarchean basement gneiss of the Miyun Group and overlying Meso-Neoproterozoic sandstones of the Changzhougou Formation of the Changcheng System and Changlongshan Formation of the Qingbaikou System from the Yan-Liao aulacogen in the Changping area, Beijing, are carried out in order to investigate the sedimentary and crustal evolution of the North China Craton (NCC). Zircon U-Ph dating on a pyroxene-bearing hornblende-plagioclase gneiss yields a protolith age of 2500 +/- 8.4Ma for the basement gneiss. A quartz sandstone sample from the lower part of the Changzhougou Formation is characterized by a unimodal spectrum of detrital zircon ages, with a peak age of ca. 2.50Ga, and this is in contrast with a bimodal age spectrum of a quartz sandstone sample from the Changlongshan Formation, with peak ages of ca. 2.50Ga and 1.80Ga, respectively. These results, mostly yielded on oscillatory zoned domains, reveal two distinct magmatic pulses in the NCC during the Neoarchean and Paleoproterozoic times. Combined with regional data, the Changzhougou Formation had its first sediments at 1.68 similar to 1.80Ga, and the Changlongshan Formation was deposited after 1.36Ga. The basement gneiss has zircon epsilon(Hf)(t) values of +1.7 similar to +4.9, intermediate between the chondrite and depleted mantle growth lines, implying a mixture of old and juvenile materials. This, combined with detrital zircon isotopes of the sandstones, indicates that the Late Neoarchean (similar to 2. 50Ga) is characterized by simultaneous occurrence of juvenile crustal growth and old crustal reworking (epsilon(Hf)(t) = 0 similar to +7.9), while the Paleo-Mesoproterozoic (similar to 1.80Ga) is dominated by recycling and reworking of the Ncoarchean crust with epsilon(Hf)(t) <0 and t(DM2) <2.80Ga, locally with involvements of the Paleo-Mesoarchean materials with epsilon(Hf)(t)(min) = -15.3 and t(DM2) > 3.00Ga. This is consistent with gradual enrichment of the lithospheric mantle of the NCC with the decreasing time during the Paleo-Mesoproterozoic. The available data further suggest that the age distribution and sedimentary evolution of the Meso-Neoproterozoic sedimentary rocks are closely related to the rifting process. The lower part of the Changzhougou Formation was deposited during the initial rifting stage and thus had a simple provenance of similar to 2.50Ga basement rocks. As the rifting developed, the provenance for the upper part of the Changzhougou Formation includes both of the basement and Paleo-Mesoproterozoic rocks, and the Changlongshan Formation contains more Paleo-Mesoproterozoic components, showing an increasing trend of the younger components in the Meso-Neoproterozoic sedimentary rocks from bottom to top.
WOS关键词	NORTH-CHINA-CRATON ; ALKALINE-RICH INTRUSIONS ; WUTAI-FUPING COMPLEXES ; DETRITAL ZIRCONS ; TECTONIC EVOLUTION ; CRUSTAL EVOLUTION ; PALEOPROTEROZOIC EVOLUTION ; COLUMBIA SUPERCONTINENT ; ZHONGTIAO MOUNTAINS ; XIAMALING FORMATION
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000292995600013
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/74502]
专题	中国科学院地质与地球物理研究所
通讯作者	Ren Rong
作者单位	1.Peking Univ, Sch Earth & Space Sci, MOE, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Ren Rong,Han BaoFu,Zhang ZhiCheng,et al. Zircon U-Pb and Hf isotopic studies of basement gneiss and overlying Meso-Neoproterozoic sedimentary rocks from the Changping area, Beijing, and their geological implications.[J]. ACTA PETROLOGICA SINICA,2011,27(6):1721-1745.
APA	Ren Rong,Han BaoFu,Zhang ZhiCheng,Li JianFeng,Yang YueHeng,&Zhang YanBin.(2011).Zircon U-Pb and Hf isotopic studies of basement gneiss and overlying Meso-Neoproterozoic sedimentary rocks from the Changping area, Beijing, and their geological implications..ACTA PETROLOGICA SINICA,27(6),1721-1745.
MLA	Ren Rong,et al."Zircon U-Pb and Hf isotopic studies of basement gneiss and overlying Meso-Neoproterozoic sedimentary rocks from the Changping area, Beijing, and their geological implications.".ACTA PETROLOGICA SINICA 27.6(2011):1721-1745.