Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.6038/cjg20130619 |
Magnetic investigation of peat sediments from the mountain in Arid Regions | |
Zhang Jun-Hui1; Xia Dun-Sheng1,2; Zhang Ying1; Liu Yu-Hang1 | |
通讯作者 | Zhang Jun-Hui |
来源期刊 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
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ISSN | 0001-5733 |
出版年 | 2013 |
卷号 | 56期号:6页码:1974-1984 |
英文摘要 | Detailed and systematic magnetic analysis was conducted on continuous peat depositional sequences from the Altay Mountains in arid regions, Northwest China. Based on magnetic properties, such as composition, concentration and grain-size, the magnetic-variation mechanism of these minerals can be discussed in peat sediments that are rich in organic matter under redox conditions. The results are showed as follows: The concentration of ferrimagnetic minerals has a low enrichment degree. Magnetite, hematite, a great deal of diamagnetic organic matter and some paramagnetic components have been identified in peat sediments, and there is no magnetotactic bacteria (MTB). The grain sizes are mainly fine particles, but meanwhile there are also coarse particles-multidomain (MD). The results further reveal that the major variations of ferrimagnetic minerals in the peat sediments occur during the short period of post-depositional processes. As for the possible mechanism, we argue that the pseudo single domain (PSD) and MD magnetite on the peatland surface are dissolved and refined in the acid waterlogged sub-oxic conditions, which results in low concentration and smaller grain sizes. Furthermore, we also speculate that no long-term burial-diagenetic dissolution processes take place in the peat sediments and little magnetite dissolution happens under the condition of alkaline and reductive environments in which the peat is buried deeply. |
英文关键词 | Peat sediment Magnetism Magnetite Redoxic conditions |
类型 | Article |
语种 | 中文 |
国家 | Peoples R China |
收录类别 | SCI-E |
WOS记录号 | WOS:000321415200019 |
WOS关键词 | NATURAL ORGANIC-MATTER ; MINERAL MAGNETISM ; DISSOLUTION ; SUSCEPTIBILITY ; TRANSITION ; MECHANISMS ; POLLUTION ; IMPACT ; RECORD ; FE3O4 |
WOS类目 | Geochemistry & Geophysics |
WOS研究方向 | Geochemistry & Geophysics |
来源机构 | 兰州大学 ; 中国科学院西北生态环境资源研究院 |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/176395 |
作者单位 | 1.Lanzhou Univ, Minist Educ, Key Lab Western Chinas Environm Syst, Lanzhou 730000, Peoples R China; 2.Chinese Acad Sci, Key Lab Desert & Desertificat, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China |
推荐引用方式 GB/T 7714 | Zhang Jun-Hui,Xia Dun-Sheng,Zhang Ying,et al. Magnetic investigation of peat sediments from the mountain in Arid Regions[J]. 兰州大学, 中国科学院西北生态环境资源研究院,2013,56(6):1974-1984. |
APA | Zhang Jun-Hui,Xia Dun-Sheng,Zhang Ying,&Liu Yu-Hang.(2013).Magnetic investigation of peat sediments from the mountain in Arid Regions.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,56(6),1974-1984. |
MLA | Zhang Jun-Hui,et al."Magnetic investigation of peat sediments from the mountain in Arid Regions".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 56.6(2013):1974-1984. |
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