Magnetic minerals in Calcic Luvisols (Chromic) developed in a warm Mediterranean region of Spain: Origin and paleoenvironmental significance
文献类型：期刊论文
| 作者 | Torrent, J.1; Liu, Q. S.2; Barron, V.1 |
| 刊名 | GEODERMA
 |
| 出版日期 | 2010-01-15 |
| 卷号 | 154期号:3-4页码:465-472 |
| 关键词 | Maghemite Hematite Magnetism Paleoclimate Magnetic susceptibility |
| ISSN号 | 0016-7061 |
| DOI | 10.1016/j.geoderma.2008.06.020 |
| 文献子类 | Article |
| 英文摘要 | Soil formation under aerobic conditions usually enhances magnetic signals, mainly through neoformation of sub-micron magnetite and/or maghemite. In order to better understand the nature and magnitude of the enhancement, in this work we characterized the iron (Fe) oxides and magnetic properties of two Calcic Luvisols (Chromic) developed on calcareous orthoquartzites in a Spanish region with a warm Mediterranean climate. Weathering of the Fe-bearing minerals in the parent material (mostly Fe-rich smectite) had resulted in the neoformation of hematite and maghemite rather than goethite, thus causing a substantial increase in magnetic susceptibility, chi, saturation magnetization, M, and other magnetic signals. The absolute frequency-dependent magnetic susceptibility, chi(FD), which is a typical proxy for the concentration of sub-micron superparamagnetic pedogenic maghemite, was strongly correlated with the concentration of hematite (Hm). The estimated percent frequency-dependent magnetic susceptibility, chi(FD)%, Was 15.7%. This and various other magnetic indicators indicate that the grain size distribution (GSD) of the pedogenic maghemite is narrower around the superparamagnetic/single domain threshold than is that of maghemite in soils and paleosols developed under other temperate climates (e.g., the Chinese Loesss Plateau, where chi(FD)%< 13%). Our results are consistent with predictions based on the ferrihydrite -> maghemite -> hematite transformation model. Also, they suggest that a wise combination of the HM/chi(FD) ratio, chi(FD)%, the hematite/goethite ratio. and several indicators of the degree of weathering provides a better tool for paleoclimatic reconstructions than does the current use of chi alone. (C) 2008 Elsevier B.V. All rights reserved. |
| WOS关键词 | LOESS-PALEOSOL SEQUENCES ; IRON-OXIDE MINERALOGY ; CHINESE LOESS ; GRAIN-SIZE ; SOILS ; SUSCEPTIBILITY ; DEPENDENCE ; ENHANCEMENT ; FERRIHYDRITE ; TRANSITION |
| WOS研究方向 | Agriculture |
| 语种 | 英语 |
| WOS记录号 | WOS:000275009400037 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | Spain's Ministerio de Educacion y Ciencia(AGL2006-10927) ; Spain's Ministerio de Educacion y Ciencia(AGL2006-10927) ; FEDER ; FEDER ; Spain's Ministerio de Educacion y Ciencia(AGL2006-10927) ; Spain's Ministerio de Educacion y Ciencia(AGL2006-10927) ; FEDER ; FEDER ; Spain's Ministerio de Educacion y Ciencia(AGL2006-10927) ; Spain's Ministerio de Educacion y Ciencia(AGL2006-10927) ; FEDER ; FEDER ; Spain's Ministerio de Educacion y Ciencia(AGL2006-10927) ; Spain's Ministerio de Educacion y Ciencia(AGL2006-10927) ; FEDER ; FEDER |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/72230]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Torrent, J. |
| 作者单位 | 1.Univ Cordoba, Dept Ciencias & Recursos Agr & Forestales, E-14071 Cordoba, Spain 2.Chinese Acad Sci, Paleomagnetism & Geochronol Lab SKL LE, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Torrent, J.,Liu, Q. S.,Barron, V.. Magnetic minerals in Calcic Luvisols (Chromic) developed in a warm Mediterranean region of Spain: Origin and paleoenvironmental significance[J]. GEODERMA,2010,154(3-4):465-472. |
| APA | Torrent, J.,Liu, Q. S.,&Barron, V..(2010).Magnetic minerals in Calcic Luvisols (Chromic) developed in a warm Mediterranean region of Spain: Origin and paleoenvironmental significance.GEODERMA,154(3-4),465-472. |
| MLA | Torrent, J.,et al."Magnetic minerals in Calcic Luvisols (Chromic) developed in a warm Mediterranean region of Spain: Origin and paleoenvironmental significance".GEODERMA 154.3-4(2010):465-472. |
入库方式： OAI收割
来源：地质与地球物理研究所
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