The signature of river- and wind-borne materials exported from Patagonia to the southern latitudes: a view from REEs and implications for paleoclimatic interpretations

Gaiero, Diego M.; Depetris, Pedro J.; Probst, Jean‐Luc; Bidart, Susana Mabel; Leleyter, Lydia

doi:10.1016/s0012-821x(03)00686-1

Cited by 89 publications

(82 citation statements)

References 51 publications

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“…During the LGS, the slight enrichment in MREE suggests a Patagonian origin (as indicated by Basile et al, 1997) because this pattern resembles those from volcanic rocks sampled in this region (Gaiero et al, 2004) and those shown by our South American dust samples (Fig. 4).…”

Section: Ree Patterns Comparisonsupporting

confidence: 68%

A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice

Gabrielli

Wegner

Petit

et al. 2010

Quaternary Science Reviews

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a b s t r a c tWe present the first Rare Earth Elements (REE) concentration record determined in 294 sections of an Antarctic ice core (EPICA Dome C), covering a period from 2.9 to 33.7 kyr BP. REE allow a detailed quantitative evaluation of aeolian dust composition because of the large number of variables (i.e. 14 elements). REE concentrations match the particulate dust concentration profile over this period and show a homogeneous crustal-like composition during the last glacial stage (LGS), with only a slight enrichment in medium REE. This signature is consistent with the persistent fallout of a mixture of dust from heterogeneous sources located in different areas or within the same region (e.g. South America). Starting at w15 kyr BP, there was a major change in dust composition, the variable character of which persisted throughout the Holocene. This varying signature may highlight the alternation of single dust contributions from different sources during the Holocene. We observe that the frequent changes in REE composition at the onset of the Holocene (10-13.5 kyr BP) are linked to dust size and in turn to wind strength and/or the path of the atmospheric trajectory. This may indicate that atmospheric circulation dictated the composition of the dust fallout to East Antarctica at that time. Although the dust concentrations remained fairly low, a notable return towards more glacial dust characteristics is recorded between 7.5 and 8.3 kyr BP. This happened concomitantly with a widespread cold event around 8 kyr BP that was 400-600 years long and suggests a moderate reactivation of the dust emission from the same potential source areas of the LGS.Published by Elsevier Ltd.

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Section: Ree Patterns Comparisonsupporting

confidence: 68%

A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice

Gabrielli

Wegner

Petit

et al. 2010

Quaternary Science Reviews

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“…5). All our ice floats and snow exhibited MREE enrichment, which could be from Patagonian origin because this pattern resembles those from volcanic rocks sampled in that region (Gaiero et al 2004) and/or those shown by South American dust (Gabrielli et al 2010).…”

Section: Rees As Tracers Of Gmw-derived Trace Elementsmentioning

confidence: 58%

The significant inputs of trace elements and rare earth elements from melting glaciers in Antarctic coastal waters

Kim¹,

Kim

Choy³

2015

Polar Research

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“…As shown previously in different regions of the world (Casas et al, 2003;Gaiero et al, 2004;Singh et al, 2005), one of the best way to assess the potential contamination of rivers and aquatic ecosystems is first to analyse the fluvial sediments deposited in the main channel. These bed sediments are integrators of the geochemical signature of the different soils and rocks and of what is happening in the river basin, as found by Cabral Pinto et al ( , 2017.…”

Section: Introductionmentioning

confidence: 99%

Geochemical composition of fluvial sediments in the Milo River basin (Guinea): is there any impact of artisanal mining and of a big African city, Kankan?

Sow

Payre-Suc

Julien

et al. 2018

Journal of African Earth Sciences

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Keywords:Bed sediments Major and trace elements REE Labile fractions Enrichment factors Spatial variations Seasonal variations Milo river Kankan Guinea A B S T R A C T For the first time, the bed sediments of the Milo River and its tributaries were sampled and analyzed to characterize their geochemical signature in terms of major, trace and rare earth elements and to determine the potential impacts of artisanal mining and of the anthropogenic activities of Kankan city. 24 sites have been sampled along the Milo river from upstream to downstream and on its tributaries during one sampling campaign to assess the spatial variations of the geochemical signature. During one year, the bed sediments have been sampled monthly on the Milo river upstream and downstream Kankan to determine the seasonal variations of their chemical composition and to investigate the potential impacts of Kankan on the fluvial sediment quality. The geochemical signatures of the sediments are mainly controlled by the geological substratum and the lateritic soil cover, showing that there is no impact of the artisanal mining and very few impacts of Kankan, except for As and Sb on two small tributaries draining the urban agglomeration. All the sediments are more concentrated and naturally enriched in Zr, Hf, U and Th compared to PAAS, due to the regional geochemical background. REE distribution patterns show LREE and HREE enrichments and positive Ce and Eu anomalies. The La/Yb ratios are positively correlated to Al and Fe-oxides and negatively to silica. The non-residual fractions (labile) extracted with EDTA represent less than 20% of the total concentration, showing that the threats for aquatic ecosystems and human populations are limited. This study can represent a reference with regard to the potential development of industrial mining and increase of population due the abundant mineral resources within this catchment.

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The signature of river- and wind-borne materials exported from Patagonia to the southern latitudes: a view from REEs and implications for paleoclimatic interpretations

Cited by 89 publications

References 51 publications

A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice

A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice

The significant inputs of trace elements and rare earth elements from melting glaciers in Antarctic coastal waters

Geochemical composition of fluvial sediments in the Milo River basin (Guinea): is there any impact of artisanal mining and of a big African city, Kankan?

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