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.

CORC > 北京大学 > 地球与空间科学学院

	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 ; Han BaoFu ; Zhang ZhiCheng ; Li JianFeng ; Yang YueHeng ; Zhang YanBin
刊名	岩石学报
	2011
关键词	North China Craton Precambrian Yan-Liao aulacogen Detrital zircon Sedimentary and crustal evolution NORTH-CHINA-CRATON ALKALINE-RICH INTRUSIONS WUTAI-FUPING COMPLEXES DETRITAL ZIRCONS TECTONIC EVOLUTION CRUSTAL EVOLUTION PALEOPROTEROZOIC EVOLUTION COLUMBIA SUPERCONTINENT ZHONGTIAO MOUNTAINS XIAMALING FORMATION
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.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000292995600013&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geology; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 4; 6; 1721-1745; 27
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/311209]
专题	地球与空间科学学院
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]. 岩石学报,2011.
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..岩石学报.
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.".岩石学报 (2011).