https://scholars.lib.ntu.edu.tw/handle/123456789/378460
標題: | Application of U/Th and 40Ar/39Ar dating to orgnac 3, a Late Acheulean and Early Middle Palaeolithic site in Ardèche, France | 作者: | Michel, V. Shen, G. CHUAN-CHOU SHEN Wu, C.-C. |
公開日期: | 2013 | 卷: | 8 | 期: | 12 | 來源出版物: | PLoS ONE | 摘要: | Refined radio-isotopic dating techniques have been applied to Orgnac 3, a Late Acheulean and Early Middle Palaeolithic site in France. Evidence of Levallois core technology appeared in level 4b in the middle of the sequence, became predominant in the upper horizons, and was best represented in uppermost level 1, making the site one of the oldest examples of Levallois technology. In our dating study, fourteen speleothem samples from levels 7, 6 and 5b, were U/Th-dated. Four pure calcite samples from the speleothem PL1 (levels 5b, 6) yield ages between 265 ± 4 (PL1-3) and 312 ± 15 (PL1-6) thousand years ago (ka). Three samples from the top of a second stalagmite, PL2, yield dates ranging from 288 ± 10 ka (PL2-1) to 298 ± 17 ka (PL2-3). Three samples from the base of PL2 (level 7) yield much younger U/Th dates between 267 and 283 ka. These dates show that the speleothems PL1 and PL2 are contemporaneous and formed during marine isotope stage (MIS) 9 and MIS 8. Volcanic minerals in level 2, the upper sequence, were dated by the 40Ar/39Ar method, giving a weighted mean of 302.9 ± 2.5 ka (2Σ) and an inverse isochron age of 302.9 ± 5.9 ka (2Σ). Both 40Ar/39Ar dating of volcanic sanidines and U/Th dating of relatively pure and dense cave calcites are known to be well established. The first parallel application of the two geochronometers to Orgnac 3 yields generally consistent results, which point to the reliability of the two methods. The difference between their age results is discussed. © 2013 Michel et al. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-84891915992&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/378460 |
DOI: | 10.1371/journal.pone.0082394 | SDG/關鍵字: | isosorbide dinitrate; radioisotope; archeology; argon argon dating; article; biostratigraphy; cave; chronology; France; geographic and geological phenomena; geographic distribution; Paleolithic; radiometric dating; rock; speleothem; stalagmite; stratigraphy; uranium thorium dating; Animals; Archaeology; Argon; Fossils; France; Minerals; Paleontology; Radioisotopes; Radiometric Dating; Thorium; Time Factors; Uranium |
顯示於: | 地質科學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。