Maher, Barbara A. and Mutch, Thomas J. and Cunningham, Dickson (2009) Magnetic and geochemical characteristics of Gobi Desert surface sediments : implications for provenance of the Chinese Loess. Geology, 37 (3). pp. 279-282.
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Abstract
Controversy exists regarding the sources of the eolian dust for the immense Loess Plateau of north-central China, the largest accumulation of windblown loess in the world. Because the loess accumulation rate, unit thickness and particle size all decrease from northwest to southeast, it has long been thought that the northern deserts, especially the Mongolian Gobi, are the major loess source, a view supported by newly applied mineralogical (electron spin resonance, ESR) provenance techniques. Here, we examine surface samples from the Gobi Desert, and compare their magnetic and geochemical properties with those of last glacial loess samples from across the Loess Plateau region. The mineralogy, geochemistry and magnetic properties of Gobi Desert samples are variable (most likely reflecting local lithological complexity), distinctive and, critically, non-overlapping with the notably homogenous characteristics of the last glacial loesses spanning the Loess Plateau. It is likely that the source areas for the Plateau encompass a much larger area than any one proximal desert region, in order to account for a) the extreme degree of mixing, b) the volume of loess generated and transported, and c) the mineralogical and magnetic mismatch evident here between the Mongolian Gobi samples and the last glacial loess.
| Item Type: | Article |
|---|---|
| Journal or Publication Title: | Geology |
| Uncontrolled Keywords: | Chinese loess ; sediment provenance ; magnetic susceptbility |
| Subjects: | G Geography. Anthropology. Recreation > G Geography (General) |
| Departments: | Faculty of Science and Technology > Lancaster Environment Centre |
| ID Code: | 27046 |
| Deposited By: | Professor Barbara A Maher |
| Deposited On: | 15 Sep 2009 09:42 |
| Refereed?: | Yes |
| Published?: | Published |
| Last Modified: | 26 Jul 2012 16:38 |
| Identification Number: | |
| URI: | http://eprints.lancs.ac.uk/id/eprint/27046 |
Available Versions of this Item
- Magnetic and geochemical characteristics of Gobi Desert 2 surface sediments : implications for provenance of the 3 Chinese Loess. (deposited 10 Feb 2009 09:05)
- Magnetic and geochemical characteristics of Gobi Desert surface sediments : implications for provenance of the Chinese Loess. (deposited 15 Sep 2009 09:42)[Currently Displayed]
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