KMS Institute of Vertebrate Paleontology and Paleoanthropology
| Further support for a Cretaceous age for the feathered-dinosaur beds of Liaoning,China: New Ar-40/Ar-39 dating of the Yixian and Tuchengzi formations | |
Swisher, CC; Wang, XL; Zhou, ZH ; Wang, YQ; Jin, F; Zhang, JY; Xu, X; Zhang, FC; Wang, Y; Swisher, CC (reprint author), Rutgers State Univ, Dept Geol Sci, Wright Labs, Piscataway, NJ 08854 USA.
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| 2002 | |
| 发表期刊 | CHINESE SCIENCE BULLETIN
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| ISSN | 1001-6538 |
| 卷号 | 47期号:2页码:135-138 |
| 文章类型 | Article |
| 摘要 | We report new Ar-40/Ar-39 dating results obtained from total fusion and incremental-heating analyses of sanidine and biotite from three tuffs found interbedded within the fossil-bearing deposits of Liaoning, northeast China. The first is a new sample of the Bed 6 Sihetun tuff from the Yixian Formation, previously dated by our team as middle Early Cretaceous, and recently considered by Lo et al., partially reset due to metamorphism from a nearby basaltic sill. The second is the Yixian Bed 9 tuff from Hengdaozi considered by Lo et al. to be unaffected by metamorphism and whose age, based on total fusion 40Ar/39Ar dating of biotite, argues for a Jurassic age for the Yixian Formation. The third tuff is a previously undated tuff from the upper part of the underlying Tuchengzi Formation. Single crystal total fusion Ar-40/Ar-39 analyses of the Sihetun sanidine showed homogeneous radiogenic Ar, Ca/K ratios, excellent reproducibility and gave a mean age of 125.0 +/- 0. 18 (1SD) +/- 0.04 (SE) Ma. Single sanidine crystal total fusion Ar-40/Ar-39 analyses of the Hengdaozi tuff gave a mean age of 125.0 +/- 0.19 (1SD) +/- 0.04 (SE) Ma, which is indistinguishable from the Sihetun tuff. The Tuchengzi Formation tuff gave a mean age of 139.4 +/- 0.19 (1SD) +/- 0.05 (SE) Ma. Detailed laser incremental-heating analyses of biotite from Sihetun, Hengdaozi, and Tuchengzi tuffs show disturbed Ar release patterns and evidence of trapped argon components. We conclude from these analyses that the total fusion dates on biotite by Lo et al. are erroneously old and isotopic dating of both biotite and sanidine from tuffs of the Yixian Formation point to a middle Early Cretaceous age. The upper part of the Tuchengzi Formation can be referred to the Early Cretaceous.; We report new Ar-40/Ar-39 dating results obtained from total fusion and incremental-heating analyses of sanidine and biotite from three tuffs found interbedded within the fossil-bearing deposits of Liaoning, northeast China. The first is a new sample of the Bed 6 Sihetun tuff from the Yixian Formation, previously dated by our team as middle Early Cretaceous, and recently considered by Lo et al., partially reset due to metamorphism from a nearby basaltic sill. The second is the Yixian Bed 9 tuff from Hengdaozi considered by Lo et al. to be unaffected by metamorphism and whose age, based on total fusion 40Ar/39Ar dating of biotite, argues for a Jurassic age for the Yixian Formation. The third tuff is a previously undated tuff from the upper part of the underlying Tuchengzi Formation. Single crystal total fusion Ar-40/Ar-39 analyses of the Sihetun sanidine showed homogeneous radiogenic Ar, Ca/K ratios, excellent reproducibility and gave a mean age of 125.0 +/- 0. 18 (1SD) +/- 0.04 (SE) Ma. Single sanidine crystal total fusion Ar-40/Ar-39 analyses of the Hengdaozi tuff gave a mean age of 125.0 +/- 0.19 (1SD) +/- 0.04 (SE) Ma, which is indistinguishable from the Sihetun tuff. The Tuchengzi Formation tuff gave a mean age of 139.4 +/- 0.19 (1SD) +/- 0.05 (SE) Ma. Detailed laser incremental-heating analyses of biotite from Sihetun, Hengdaozi, and Tuchengzi tuffs show disturbed Ar release patterns and evidence of trapped argon components. We conclude from these analyses that the total fusion dates on biotite by Lo et al. are erroneously old and isotopic dating of both biotite and sanidine from tuffs of the Yixian Formation point to a middle Early Cretaceous age. The upper part of the Tuchengzi Formation can be referred to the Early Cretaceous. |
| 关键词 | Ar-40/ar-39 Dating Cretaceous Yixian Formation Tuchengzi Formation Western Liaoning |
| WOS标题词 | Science & Technology |
| 关键词[WOS] | CHINA |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Science & Technology - Other Topics |
| WOS类目 | Multidisciplinary Sciences |
| WOS记录号 | WOS:000174261900013 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.205/handle/311034/3821 |
| 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 | Swisher, CC (reprint author), Rutgers State Univ, Dept Geol Sci, Wright Labs, Piscataway, NJ 08854 USA. |
| 作者单位 | 1.Rutgers State Univ, Dept Geol Sci, Wright Labs, Piscataway, NJ 08854 USA 2.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China |
| 推荐引用方式 GB/T 7714 | Swisher, CC,Wang, XL,Zhou, ZH,et al. Further support for a Cretaceous age for the feathered-dinosaur beds of Liaoning,China: New Ar-40/Ar-39 dating of the Yixian and Tuchengzi formations[J]. CHINESE SCIENCE BULLETIN,2002,47(2):135-138. |
| APA | Swisher, CC.,Wang, XL.,Zhou, ZH.,Wang, YQ.,Jin, F.,...&Swisher, CC .(2002).Further support for a Cretaceous age for the feathered-dinosaur beds of Liaoning,China: New Ar-40/Ar-39 dating of the Yixian and Tuchengzi formations.CHINESE SCIENCE BULLETIN,47(2),135-138. |
| MLA | Swisher, CC,et al."Further support for a Cretaceous age for the feathered-dinosaur beds of Liaoning,China: New Ar-40/Ar-39 dating of the Yixian and Tuchengzi formations".CHINESE SCIENCE BULLETIN 47.2(2002):135-138. |
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