KMS Institute of Vertebrate Paleontology and Paleoanthropology
| DATES AND RATES IN ANCIENT LAKES - AR-40-AR-39 EVIDENCE FOR AN EARLY CRETACEOUS AGE FOR THE JEHOL GROUP, NORTHEAST CHINA | |
| SMITH, PE; EVENSEN, NM; YORK, D; CHANG, MM; JIN, F; LI, JL; CUMBAA, S; RUSSELL, D; SMITH, PE (reprint author), UNIV TORONTO,DEPT PHYS,60 ST GEORGE ST,TORONTO,ON M5S 1A7,CANADA. | |
| 1995-09-01 | |
| 发表期刊 | CANADIAN JOURNAL OF EARTH SCIENCES
 |
| ISSN | 0008-4077 |
| 卷号 | 32期号:9页码:1426-1431 |
| 文章类型 | Article |
| 摘要 | The correlation of freshwater sediments in small, fault-bound basins in Liaoning Province, northeast China, known as the Jehol (or Rehe) Group, has been a subject of debate for many years, with biochronological estimates ranging from Late Jurassic to the Cretaceous periods. We have applied the laser Ar-40-Ar-39 technique to volcanic intercalations and lacustrine sediments from the Yixian Formation at the base of the Jehol Group. Minerals and whole-rock chips from the upper parts of the Yixian Formation give concordant ages with a mean of 121.1 +/- 0.2 Ma (1 sigma). Ages for samples near the base of the Yixian Formation give 121.4 +/- 0.6 and 122.9 +/- 0.3 Ma, and appear to be synchronous or only slightly older than the top of the formation. Integrated ages of 122 Ma for glaucony from the lacustrine sediments lying stratigraphically between the upper and lower parts of the Yixian are in very good agreement with the absolute age framework provided by the volcanic units. Such disseminated facies of this clay show promise for directly dating lacustrine sediments. All of the above Ar-40-Ar-39 dates provide an absolute calibration of the Yixian Formation, and show that the whole formation was deposited entirely within Early Cretaceous time over an interval of no more than 2-3 Ma.; The correlation of freshwater sediments in small, fault-bound basins in Liaoning Province, northeast China, known as the Jehol (or Rehe) Group, has been a subject of debate for many years, with biochronological estimates ranging from Late Jurassic to the Cretaceous periods. We have applied the laser Ar-40-Ar-39 technique to volcanic intercalations and lacustrine sediments from the Yixian Formation at the base of the Jehol Group. Minerals and whole-rock chips from the upper parts of the Yixian Formation give concordant ages with a mean of 121.1 +/- 0.2 Ma (1 sigma). Ages for samples near the base of the Yixian Formation give 121.4 +/- 0.6 and 122.9 +/- 0.3 Ma, and appear to be synchronous or only slightly older than the top of the formation. Integrated ages of 122 Ma for glaucony from the lacustrine sediments lying stratigraphically between the upper and lower parts of the Yixian are in very good agreement with the absolute age framework provided by the volcanic units. Such disseminated facies of this clay show promise for directly dating lacustrine sediments. All of the above Ar-40-Ar-39 dates provide an absolute calibration of the Yixian Formation, and show that the whole formation was deposited entirely within Early Cretaceous time over an interval of no more than 2-3 Ma. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| URL | 查看原文 |
| 关键词[WOS] | SINGLE GRAINS ; BIOTITE ; RECOIL |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:A1995TF84800012 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.205/handle/311034/4081 |
| 专题 | 中科院古脊椎所（2000年以后） |
| 通讯作者 | SMITH, PE (reprint author), UNIV TORONTO,DEPT PHYS,60 ST GEORGE ST,TORONTO,ON M5S 1A7,CANADA. |
| 作者单位 | 1.INST VERTEBRATE PALEONTOL & PALEOANTHROPOL, BEIJING 100044, PEOPLES R CHINA 2.CANADIAN MUSEUM NAT, OTTAWA, ON K1P 6P4, CANADA |
| 推荐引用方式 GB/T 7714 | SMITH, PE,EVENSEN, NM,YORK, D,et al. DATES AND RATES IN ANCIENT LAKES - AR-40-AR-39 EVIDENCE FOR AN EARLY CRETACEOUS AGE FOR THE JEHOL GROUP, NORTHEAST CHINA[J]. CANADIAN JOURNAL OF EARTH SCIENCES,1995,32(9):1426-1431. |
| APA | SMITH, PE.,EVENSEN, NM.,YORK, D.,CHANG, MM.,JIN, F.,...&SMITH, PE .(1995).DATES AND RATES IN ANCIENT LAKES - AR-40-AR-39 EVIDENCE FOR AN EARLY CRETACEOUS AGE FOR THE JEHOL GROUP, NORTHEAST CHINA.CANADIAN JOURNAL OF EARTH SCIENCES,32(9),1426-1431. |
| MLA | SMITH, PE,et al."DATES AND RATES IN ANCIENT LAKES - AR-40-AR-39 EVIDENCE FOR AN EARLY CRETACEOUS AGE FOR THE JEHOL GROUP, NORTHEAST CHINA".CANADIAN JOURNAL OF EARTH SCIENCES 32.9(1995):1426-1431. |
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