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Using Bulk XRF-Analysis of Chinese Loess to Determine High-Resolution Records of Dust Provenance
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
2017 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Understanding the sources of the dust that forms the extensive loess deposits on the Chinese Loess Plateau is crucial for reconstructing atmospheric circulation patterns and dust pathways. Dust sources are however highly debated, mainly due to the low resolution of many records and the often ambiguous nature of geochemical proxies. The widely used concept of elemental ratios as provenance indicators is based on the idea that the relative abundance of immobile elements remains unaffected by chemical weathering, thereby preserving source signals. High-resolution spatial and temporal records of loess composition were determined for two study sites and three lithostratigraphic units using bulk X-ray fluorescence (XRF) analysis, and independently dated using Optically Stimulated (OSL) and post-IR Infrared Stimulated (pIR-IRSL) Luminescence dating. Four elemental ratios were chosen based on element properties of mobility and grain size, linear correlation strength and the existence of lithostratigraphic trends: Ti/Al, Si/Al, K/Al and Fe/Ti. Potential source signals were detected at both sites, at glacial-interglacial transitions as well as within lithostratigraphic units. Source changes detected within lithostratigraphic units show millennial-scale variability, indicating that abrupt shifts in dust provenance are possible. This implies that millennial-scale variability of the East Asian Monsoon may be related to changes in atmospheric dust content.

Place, publisher, year, edition, pages
2017. , p. 44
Series
Självständigt arbete vid Institutionen för geovetenskaper ; 2017:4
Keyword [en]
dust, provenance, elemental ratios, Chinese Loess Plateau
National Category
Earth and Related Environmental Sciences Physical Geography
Identifiers
URN: urn:nbn:se:uu:diva-317881OAI: oai:DiVA.org:uu-317881DiVA, id: diva2:1083437
Educational program
Bachelor Programme in Earth Science
Presentation
2017-03-13, Institutionen för geovetenskaper, Villavägen 16, Uppsala, 13:30 (English)
Supervisors
Examiners
Available from: 2017-03-21 Created: 2017-03-21 Last updated: 2018-01-13Bibliographically approved

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CiteExportLink to record
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