The last glacial/interglacial cycle at two sites in the Chinese Loess Plateau: Mineral magnetic, grain-size and Be-10 measurements and estimates of palaeoprecipitation
文献类型：期刊论文
| 作者 | Sartori, M; Evans, ME; Heller, F; Tsatskin, A; Han, JM |
| 刊名 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
 |
| 出版日期 | 2005-06-21 |
| 卷号 | 222期号:1-2页码:145-160 |
| ISSN号 | 0031-0182 |
| DOI | 10.1016/j.palaeo.2005.03.013 |
| 文献子类 | Article |
| 英文摘要 | To elucidate the way in which past climatic changes are encoded magnetically by wind-blown silt, we have investigated two stratigraphic sections in the Chinese Loess Plateau (Xiagaoyuan, in the cool, dry western plateau and Houzhuang, in the warmer, wetter central plateau). In view of the anticipated importance of magnetic particle size, we have determined grain-size distributions from > 50 mu m down to similar to 10 nm by sequential sieving, sedimentation and centrifugation of typical loess and palaeosol material from the two sites. For the essentially unaltered loess, the main susceptibility contribution lies in the 20-50 mu m fraction, with only similar to 20% of the signal residing in the < 2 mu m fraction. In the well-developed palaeosol, similar to 60% of the susceptibility comes from the < 2 gm fraction, with a strong peak in the 0.1-0.4 mu m fraction. Low-temperature experiments confirm this magnetic enhancement, and also exhibit Verwey transitions characteristic of magnetite. Magnetic hysteresis parameters show simple relationships to susceptibility, which can be interpreted in terms of a uniform mineral ingredient which increases in amount as pedogenesis intensifies. Beryllium-10 content was determined for a profile spanning palaeosol S-1 (corresponding to oxygen isotope stage 5) at Houzhuang, and a peak value of 4.8 x 10(8) atoms/g was observed, almost identical to that found by other workers for the same horizon at Luochuan, A similar profile at Xiagaoyuan reveals three peaks corresponding to palaeosols S1S1, (2.6 x 10(8) atoms/g), S1S2 (3.3 x 10(8) atoms/g) and S1S3 (3.3 x 10(8) atoms/g). Conversion of these concentrations into Be-10 fluxes indicates low dust accumulation during warmer climate episodes. At these times pedogenic susceptibility enhancement is favoured, the amounts of which imply palaeoprecipitation slightly higher than today for S1S3 at Xiagaoyuan, but somewhat lower than today for S-1 at Houzhuang, (c) 2005 Elsevier B.V. All rights reserved. |
| WOS关键词 | SUSCEPTIBILITY ; RECONSTRUCTIONS ; ENHANCEMENT ; SEQUENCES ; SECTION |
| WOS研究方向 | Physical Geography ; Geology ; Paleontology |
| 语种 | 英语 |
| WOS记录号 | WOS:000230051500008 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/65000]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Heller, F |
| 作者单位 | 1.ETH, Inst Geophys, CH-8093 Zurich, Switzerland 2.Univ Alberta, Inst Geophys Res, Edmonton, AB T6G 2J1, Canada 3.Univ Haifa, Archaeol Inst, IL-31905 Haifa, Israel 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sartori, M,Evans, ME,Heller, F,et al. The last glacial/interglacial cycle at two sites in the Chinese Loess Plateau: Mineral magnetic, grain-size and Be-10 measurements and estimates of palaeoprecipitation[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2005,222(1-2):145-160. |
| APA | Sartori, M,Evans, ME,Heller, F,Tsatskin, A,&Han, JM.(2005).The last glacial/interglacial cycle at two sites in the Chinese Loess Plateau: Mineral magnetic, grain-size and Be-10 measurements and estimates of palaeoprecipitation.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,222(1-2),145-160. |
| MLA | Sartori, M,et al."The last glacial/interglacial cycle at two sites in the Chinese Loess Plateau: Mineral magnetic, grain-size and Be-10 measurements and estimates of palaeoprecipitation".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 222.1-2(2005):145-160. |
入库方式： OAI收割
来源：地质与地球物理研究所
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