Further discussion on the geologic age of Sihetun vertebrate assemblage in western Liaoning, China: evidence from Ar-Ar dating.

IVPP-IR > 中科院古脊椎所（2000年以后）

	Further discussion on the geologic age of Sihetun vertebrate assemblage in western Liaoning, China: evidence from Ar-Ar dating.
其他题名	再论辽西四合屯脊椎动物生存时代:Ar-Ar年龄证据
	Wang, SS ; Hu, HG ; Li, PX ; Wang, YQ; Wang, SS (reprint author), Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China.
	2001-10-01
发表期刊	ACTA PETROLOGICA SINICA
ISSN	1000-0569
卷号	17 期号:4 页码:663-668
文章类型	Article
摘要	The geologic age of the feathered dinosaurs and early birds in Sihetun and its neighboring area in Beipiao, western Liaoning is appointed to different epoches of the Mesozoic Era, such as the Late Jurassic, the Early Cretaceous or the Late Jurassic - Early Cretaceous. Even the dating data are also very different. Recent report of the U-Pb age of 125.2 +/- 0.9 Ma of zircon separated from tuff in the bed 6 of the composite stratigraphic column of Yixian Formation in Sihetun and its neighboring area, indicated that the Sihetun vertebrate belonged to the Early Cretaceous. This paper provides new evidence from Ar-Ar dating. YL29 basalt-andesite was collected from the low part of the bed 2 of the composite stratigraphic column, and the sample yields a K-Ar age of 129.0 +/- 0.9 Ma. The Ar-Ar step-heating experiment performed on the YL29 basalt-andesite yields a remarkably simple pattern. Apparent ages from step 6 similar to 13, comprising over 90 percent of the release of Ar-39, are virtually concordant, and give a plateau age of 128.2 +/- 0.8 Ma. The Ar-Ar total gas age (all 15 steps) on the sample is 128.4 +/- 1.4 Ma. When all steps data are plotted on a correlation or isochron diagram, an age of 128.4 +/- 0.2 Ma is obtained. YL30 diabase was collected from the subvolcanic rock, which intruded into beds 5 similar to9. The Ar-Ar step-heating experiment on this sample yields a virtually concordant set of ages over 93 percent of the release of Ar-39 (step 7 similar to 12) with a plateau age of 122.3 +/- 0.5 Ma. The Ar-Ar total gas age (all 12 steps) on the diabase is 121.1 +/- 1.2 Ma. The age obtained from the isochron plot using all steps data points is 121.8 +/- 1.3 Ma, indistinguishable from the plateau age. About the Jurassic-Cretaceous boundary age, there are continuous disputations internationally and both 135 Ma and 144 Ma are proposed for the boundary. The Chinese geochronologists prefer the forme one. According to above Ar-Ar age data of YL29 basalt-andesite and YL30 diabase, the Sihetun vertebrate assemblage should be the Early Cretaceous in age.;The geologic age of the feathered dinosaurs and early birds in Sihetun and its neighboring area in Beipiao, western Liaoning is appointed to different epoches of the Mesozoic Era, such as the Late Jurassic, the Early Cretaceous or the Late Jurassic - Early Cretaceous. Even the dating data are also very different. Recent report of the U-Pb age of 125.2 +/- 0.9 Ma of zircon separated from tuff in the bed 6 of the composite stratigraphic column of Yixian Formation in Sihetun and its neighboring area, indicated that the Sihetun vertebrate belonged to the Early Cretaceous. This paper provides new evidence from Ar-Ar dating. YL29 basalt-andesite was collected from the low part of the bed 2 of the composite stratigraphic column, and the sample yields a K-Ar age of 129.0 +/- 0.9 Ma. The Ar-Ar step-heating experiment performed on the YL29 basalt-andesite yields a remarkably simple pattern. Apparent ages from step 6 similar to 13, comprising over 90 percent of the release of Ar-39, are virtually concordant, and give a plateau age of 128.2 +/- 0.8 Ma. The Ar-Ar total gas age (all 15 steps) on the sample is 128.4 +/- 1.4 Ma. When all steps data are plotted on a correlation or isochron diagram, an age of 128.4 +/- 0.2 Ma is obtained. YL30 diabase was collected from the subvolcanic rock, which intruded into beds 5 similar to9. The Ar-Ar step-heating experiment on this sample yields a virtually concordant set of ages over 93 percent of the release of Ar-39 (step 7 similar to 12) with a plateau age of 122.3 +/- 0.5 Ma. The Ar-Ar total gas age (all 12 steps) on the diabase is 121.1 +/- 1.2 Ma. The age obtained from the isochron plot using all steps data points is 121.8 +/- 1.3 Ma, indistinguishable from the plateau age. About the Jurassic-Cretaceous boundary age, there are continuous disputations internationally and both 135 Ma and 144 Ma are proposed for the boundary. The Chinese geochronologists prefer the forme one. According to above Ar-Ar age data of YL29 basalt-andesite and YL30 diabase, the Sihetun vertebrate assemblage should be the Early Cretaceous in age.
关键词	Sibetun Vertebrate Basalt-andesite Subvolcanic Rock Ar-ar Dating Early Cretaceous
WOS标题词	Science & Technology ; Physical Sciences
关键词[WOS]	FEATHERED DINOSAURS ; EVOLUTION
收录类别	SCI
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000172356500018
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/3843
专题	中科院古脊椎所（2000年以后）古低等脊椎动物研究室
通讯作者	Wang, SS (reprint author), Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China.
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 3.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Wang, SS,Hu, HG,Li, PX,et al. Further discussion on the geologic age of Sihetun vertebrate assemblage in western Liaoning, China: evidence from Ar-Ar dating.[J]. ACTA PETROLOGICA SINICA,2001,17(4):663-668.
APA	Wang, SS,Hu, HG,Li, PX,Wang, YQ,&Wang, SS .(2001).Further discussion on the geologic age of Sihetun vertebrate assemblage in western Liaoning, China: evidence from Ar-Ar dating..ACTA PETROLOGICA SINICA,17(4),663-668.
MLA	Wang, SS,et al."Further discussion on the geologic age of Sihetun vertebrate assemblage in western Liaoning, China: evidence from Ar-Ar dating.".ACTA PETROLOGICA SINICA 17.4(2001):663-668.

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