Loess geochemistry and its implications for particle origin and composition of the upper continental crust

Gallet, Sylvain; Jahn, Bor‐ming; Lanoë, Brigitte Van Vliet; Dia, Aline; Rossello, Eduardo A.

doi:10.1016/s0012-821x(97)00218-5

Cited by 366 publications

(300 citation statements)

References 46 publications

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“…loesses of the Loess Plateau (Gallet et al, 1996(Gallet et al, , 1998 show slightly lower (La/Yb) N ratio but similar Eu/Eu* value to the Taklimakan Desert sands and Tarim loess. The Tibet soils are similar to the Taklimakan Desert sands and the Tarim loess in the (La/Yb) N and Eu/Eu* ratios.…”

Section: Rare Earth Element (Ree) Abundancesmentioning

confidence: 78%

Sr and Nd isotope ratios and REE abundances of moraines in the mountain areas surrounding the Taklimakan Desert, NW China.

et al. 2000

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The first systematic data of Sr and Nd isotopic ratios, REE abundances, major element and mineral compositions are reported for the Chinese moraines from the western Kunlun Mts. and southern and northern flanks of the Tianshan Mts. and soils from the Tibet Plateau. This study was conducted in order to characterize the isotopic and geochemical features of these moraines and soils, which are considered as possible sources of the Taklimakan Desert sands. The moraines and the desert sands consist of quartz and feldspar as dominant minerals, but the former have higher clay and mica and lower carbonate mineral abundances than the latter. In spite of the wide variation, average values of most major elements of the moraines are generally similar to those of the Taklimakan Desert sands, except for CaO depletion and K 2 O enrichment in the moraines. Sr and Nd isotopic ratios are also highly variable for moraines, particularly from the Tianshan northern flank, while those for the desert sands show restricted values. In the Sr-Nd isotopic diagram, the Taklimakan Desert sands are plotted in the narrow field overlapped by both the moraine matrices from the western Kunlun Mts. and from the Tianshan southern flank. In addition, it is noted that average value of Nd isotopic ratios for the moraines is clearly higher than those for the desert sands. Two Tibetan soils of this study show wide variation in mineral composition and major element compositions (SiO 2 = 75% and CaO =1.5% for one sample and SiO 2 = 44% and CaO =31.8% for the other). However, Sr isotopic ratios of both soils are similar to those of the desert sands and their Nd isotopic data are slightly smaller than the desert sands. These results suggest moraine matrices from both the western Kunlun Mts. and the Tianshan southern flank and the Tibetan soils as possible sources for the Taklimakan Desert sands.

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Section: Rare Earth Element (Ree) Abundancesmentioning

confidence: 78%

Sr and Nd isotope ratios and REE abundances of moraines in the mountain areas surrounding the Taklimakan Desert, NW China.

et al. 2000

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“…We use the Nd isotope signature of peat to decipher between local and distal sources (such as in Le Roux et al, 2012). The observed eNd variability (À13 to À9) in Misten peat samples is interpreted as a mixing between dust sources (Table 3) from local (Early Cambrian shales = À11.3, André et al, 1986; Early Cambrian phyllades = À10.8 and mean Paleozoic shales = À12.2, Linnemann et al, 2012), regional soils (mean European crust = À10.8, Michard et al, 1985; mean European loess = À11.6, data from Gallet et al, 1998) and desert particles (mean Saharan airbornes = À12.9 -data from Goldstein et al, 1984;Grousset et al, 1988a,b;Colin, 1993;Henry et al, 1994;Rognon et al, 1996). The eNd variability is further compared with the humification degree to evaluate the local relative humidity conditions (Fig.…”

Section: Climate-related Dust Record In Misten Peat Bog Over the Histmentioning

confidence: 91%

Deciphering human–climate interactions in an ombrotrophic peat record: REE, Nd and Pb isotope signatures of dust supplies over the last 2500years (Misten bog, Belgium)

Fagel

Allan

Roux

et al. 2014

Geochimica et Cosmochimica Acta

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, et al.. Deciphering human-climate interactions in an ombrotrophic peat record: REE, Nd and Pb isotope signatures of dust supplies over the last 2500 years (Misten bog, Belgium). Geochimica et Cosmochimica Acta, Elsevier, 2014Elsevier, , vol. 135, pp. 288-306. 10.1016Elsevier, /j.gca.2014 To cite this Fagel, Nathalie and Allan, Mohammed and Le Roux, Gaël and Mattielli, Nadine and Piotrowska, Natalia and Sikorski, Jaroslaw AbstractA high-resolution peat record from Eastern Belgium reveals the chronology of dust deposition for the last 2500 years. REE and lithogenic elements in addition to Nd and Pb isotopes were measured in a 173 cm age-dated peat profile and provide a continuous chronology of dust source and intensity. Calculated dust flux show pronounced increases c. 300 BC, 600 AD, 1000 AD, 1200 AD and from 1700 AD, corresponding to local and regional human activities combined with climate change.The Industrial Revolution samples (1700-1950 AD) are characterised by a significant enrichment in Sc-normalised REE abundance (sum REE/Sc > 25) due to intensive coal combustion. For the pre-Industrial Revolution samples, the Sc-normalised REE abundance (10 < Sum REE/Sc < 25) and the eNd variability (À13 to À9) are interpreted by a mixing between dust particles from local soils and long-range transport of desert particles. Three periods characterised by dominant-distal sources (c. 320 AD, 1000 AD and 1700 AD) are consistent with local wetter-than-average intervals as indicated by a lower degree of peat humification. Local erosion prevails during the drier (higher humification) intervals (100 AD, 600 AD). On a global scale, more distal supplies are driven during colder periods, in particular during the Oort and Maunder minima, suggesting a potential link between dust deposition and global climate. Combining REE abundance, fractionation between Light REE and Heavy REE and Nd isotope data in ombrotrophic peat allows one to distinguish between dust flux changes related to human and climate forcings.

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“…An investigation (Wang et al, 2005) used the earth's crustal mean abundances of the metal elements given by Gallet et al (1998) and Hu and Gao (2008). Si, Al, Fe or Ti is frequently used as the reference element.…”

Section: Enrichment Factors Of Metal Elements In Spm and Commentioning

confidence: 99%

Heavy metals in particulate and colloidal matter from atmospheric deposition of urban Guangzhou, South China

Huang

Duan

Cheng

et al. 2014

Marine Pollution Bulletin

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Loess geochemistry and its implications for particle origin and composition of the upper continental crust

Cited by 366 publications

References 46 publications

Sr and Nd isotope ratios and REE abundances of moraines in the mountain areas surrounding the Taklimakan Desert, NW China.

Sr and Nd isotope ratios and REE abundances of moraines in the mountain areas surrounding the Taklimakan Desert, NW China.

Deciphering human–climate interactions in an ombrotrophic peat record: REE, Nd and Pb isotope signatures of dust supplies over the last 2500years (Misten bog, Belgium)

Heavy metals in particulate and colloidal matter from atmospheric deposition of urban Guangzhou, South China

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