Timing of the Jiufotang Formation (Jehol Group) in Liaoning, northeastern China, and its implications

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	Timing of the Jiufotang Formation (Jehol Group) in Liaoning, northeastern China, and its implications
	He, HY; Wang, XL(汪筱林); Zhou, ZH(周忠和); Wang, F; Boven, A; Shi, GH; Zhu, RX; He, HY (reprint author), Inst Geol & Geophys, POB 9825, Beijing 100029, Peoples R China.
	2004
发表期刊	GEOPHYSICAL RESEARCH LETTERS
ISSN	0094-8276
卷号	31 期号:12 页码:—
摘要	The timing of the Jiufotang Formation remains speculative despite recent progress in the study of the Jehol Biota. In this paper we contribute to this topic with Ar-40/Ar-39 dating on K-feldspar (sanidine and orthoclase) from tuffs interbedded within the fossil-bearing shales of the Jiufotang Formation, from the upper part of the Jehol Group in Chaoyang, Liaoning, northeastern China. Ar-40/(39) Ar step heating analyses of K-feldspar and the SHRIMP U-Pb zircon data indicate that tuffs at the Shangheshou section erupted at 120.3 +/- 0.7 million years ago. This result confirms an Aptian age for the Jiufotang Formation that was mainly based on biostratigraphic evidence. It also places stringent controls on the age of the fossils from the formation, providing a minimum age (120 Ma) for the four-winged dinosaur, Microraptor, and the seed-eating bird, Jeholornis.
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文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/3649
专题	中科院古脊椎所（2000年以后）
通讯作者	He, HY (reprint author), Inst Geol & Geophys, POB 9825, Beijing 100029, Peoples R China.
推荐引用方式 GB/T 7714	He, HY,Wang, XL,Zhou, ZH,et al. Timing of the Jiufotang Formation (Jehol Group) in Liaoning, northeastern China, and its implications[J]. GEOPHYSICAL RESEARCH LETTERS,2004,31(12):—.
APA	He, HY.,Wang, XL.,Zhou, ZH.,Wang, F.,Boven, A.,...&He, HY .(2004).Timing of the Jiufotang Formation (Jehol Group) in Liaoning, northeastern China, and its implications.GEOPHYSICAL RESEARCH LETTERS,31(12),—.
MLA	He, HY,et al."Timing of the Jiufotang Formation (Jehol Group) in Liaoning, northeastern China, and its implications".GEOPHYSICAL RESEARCH LETTERS 31.12(2004):—.

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