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Controlling factors on heavy mineral assemblages in Chinese loess and Red Clay
Nie, JS (Nie, Junsheng)[ 1 ]; Peng, WB (Peng, Wenbin)[ 1 ]; Pfaff, K (Pfaff, Katharina)[ 2 ]; Moller, A (Moeller, Andreas)[ 3 ]; Garzanti, E (Garzanti, Eduardo)[ 4 ]; Ando, S (Ando, Sergio)[ 4 ]; Stevens, T (Stevens, Thomas)[ 5 ]; Bird, A (Bird, Anna)[ 5 ]; Chang, H (Chang, Hong)[ 6 ]; Song, YG (Song, Yougui)[ 6 ]; Liu, SP (Liu, Shanpin)[ 1 ]; Ji, SC (Ji, Shunchuan)[ 1 ]
2013-07-30
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
Volume381Pages:110-118
Subtype期刊论文
Abstract

Heavy-mineral analysis is a sensitive technique in constraining provenance of sandstone, but has rarely been applied to loess. Here we report a heavy-mineral study of selected samples from the Luochuan, Xifeng and Caoxian loess-Red Clay sections on the Chinese Loess Plateau, based on the novel QEMSCAN (Quantitative Evaluation of Minerals by Scanning Electron Microscopy) technique. We found that heavy mineral assemblages of loess deposited through the past 500 kyr are similar and unchanged by post-depositional chemical dissolution. In contrast, in samples deposited from 900 ka to 3 Ma, the relative proportion of stable minerals tends to increase down section. In addition, the Xifeng samples consistently display higher contents of unstable ferromagnesian minerals than the Luochuan samples. Detailed analysis of surface textures displayed by different minerals by optical methods indicates that such a compositional difference can be ascribed to more effective diagenetic dissolution for the Luochuan section, explained by more extensive percolation of interstitial waters in wetter climatic conditions. Interestingly, heavy-mineral assemblages in the underlying upper Miocene Red Clay from Xifeng (deposition age similar to 7 Ma) are similar to those of recent loess deposited since 500 ka. This similarity indicates that climate and/or local preservation conditions hampered dissolution reactions, thus helping to preserve an original provenance signal that remained largely unchanged throughout the considered time period. Our study demonstrates that climatically- and time-controlled diagenesis plays a key role in determining the composition of heavy-mineral assemblages contained in loess deposited several hundreds of thousands years ago. We also show that by using both QEMSCAN and traditional optical techniques on the same samples we can obtain fundamental complementary information for a correct interpretation of the heavy-mineral assemblage.

KeywordHeavy Mineral Loess Red Clay Paleoclimate Provenance
DOI10.1016/j.yqres.2013.01.002
Indexed BySCI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9977
Collection古环境研究室
Corresponding AuthorNie, JS (Nie, Junsheng)[ 1 ]
Affiliation1.Key Laboratory of Western China's Environment System, Ministry of Education, Lanzhou University, Lanzhou, Gansu 730000, China;
2.Department of Geology and Geological Engineering, Colorado School of Mines, 1516 Illinois Street, Golden, CO 80401, USA;
3.Department of Geology, University of Kansas, 1475 Jayhawk Boulevard, Lawrence, KS 66045, USA;
4.Department of Earth and Environmental Scienceso, Universita' di Milano-Bicocca, Piazza della Scienza 4, 20126 Milano, Italy;
5.Centre for Quaternary Research, Department of Geography, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK;
6.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, P.O. Box 17, 710075, China
Recommended Citation
GB/T 7714
Nie, JS ,Peng, WB ,Pfaff, K ,et al. Controlling factors on heavy mineral assemblages in Chinese loess and Red Clay[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2013,381:110-118.
APA Nie, JS .,Peng, WB .,Pfaff, K .,Moller, A .,Garzanti, E .,...&Ji, SC .(2013).Controlling factors on heavy mineral assemblages in Chinese loess and Red Clay.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,381,110-118.
MLA Nie, JS ,et al."Controlling factors on heavy mineral assemblages in Chinese loess and Red Clay".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 381(2013):110-118.
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