Influence of atmospheric deposits and secondary minerals on Li isotopes budget in a highly weathered catchment, Guadeloupe (Lesser Antilles)

Clergue, Clémentine; Dellinger, Mathieu; Buss, Heather L.; Gaillardet, Jérôme; Benedetti, Marc F.; Dessert, Céline

doi:10.1016/j.chemgeo.2015.08.015

Cited by 98 publications

(110 citation statements)

References 92 publications

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“…In 385 addition, some degree of control by biology over Si isotopes and concentrations 386 is likely -in particular, due to the intensive agriculture of the Ganges alluvial 387 plain. In contrast, Li isotopes are unlikely to be directly affected by enhanced 388 plant growth (Clergue et al, 2015;Lemarchand et al, 2010;Pogge von 389 Strandmann et al, 2016), and fertilisers in the High Himalayan region are 390 thought to have higher δ 7 Li than any samples observed here (Kisakürek et al, 391 2005). 392 393…”

Section: Comparison Of Lithium Isotopes To River Chemistry 256mentioning

confidence: 46%

Lithium isotope behaviour during weathering in the Ganges Alluvial Plain

Strandmann

Frings

Murphy

2017

Geochimica et Cosmochimica Acta

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17The Ganges river system is responsible for the transportation of a large flux of 18 dissolved materials derived from Himalayan weathering to the oceans. Silicate 19 weathering-driven cooling resulting from uplift of the Himalayas has been 20 proposed to be a key player in Cenozoic climate variation. This study has 21analysed Li isotope (δ 7 Li) ratios from over 50 Ganges river waters and 22 sediments, in order to trace silicate weathering processes. Sediments have δ 7 Li of 23 ~0‰, identical to bulk continental crust, however suspended sediment depth 24 profiles do not display variations associated with grain size that have been 25

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Section: Comparison Of Lithium Isotopes To River Chemistry 256mentioning

confidence: 46%

Lithium isotope behaviour during weathering in the Ganges Alluvial Plain

Strandmann

Frings

Murphy

2017

Geochimica et Cosmochimica Acta

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“…Another possibility could be that, during humid periods, clays come from deeper soil horizons (because high physical denudation have removed the top layers) with lower δ 7 Li values. Previous investigations have shown indeed that δ 7 Li of bulk soil samples can vary as a function of depth3740414243. However, when compiling all the published soil data, no clear δ 7 Li systematics appears between the upper and deeper soil horizons at the scale of river catchments: some soils exhibit constant δ 7 Li as a function of depth while others may display variable compositions with enrichment or depletion in 7 Li37.…”

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confidence: 96%

Abrupt response of chemical weathering to Late Quaternary hydroclimate changes in northeast Africa

Bastian

Revel

Bayon

et al. 2017

Sci Rep

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Chemical weathering of silicate rocks on continents acts as a major sink for atmospheric carbon dioxide and has played an important role in the evolution of the Earth’s climate. However, the magnitude and the nature of the links between weathering and climate are still under debate. In particular, the timescale over which chemical weathering may respond to climate change is yet to be constrained at the continental scale. Here we reconstruct the relationships between rainfall and chemical weathering in northeast Africa for the last 32,000 years. Using lithium isotopes and other geochemical proxies in the clay-size fraction of a marine sediment core from the Eastern Mediterranean Sea, we show that chemical weathering in the Nile Basin fluctuated in parallel with the monsoon-related climatic evolution of northeast Africa. We also evidence strongly reduced mineral alteration during centennial-scale regional drought episodes. Our findings indicate that silicate weathering may respond as quickly as physical erosion to abrupt hydroclimate reorganization on continents. Consequently, we anticipate that the forthcoming hydrological disturbances predicted for northeast Africa may have a major impact on chemical weathering patterns and soil resources in this region.

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“…23 °C and 75 %, respectively (Plaisir et al, 2003). The average annual precipitation of the last years ranges from 1500 to 7000 mm yr -1 , depending on the topography (Clergue et al, 2015;Dessert et al, 2015). Climate is characterized by two seasons: a dry season from January to June and a wet and rainy season from July to December.…”

Section: Climate and Hydrologymentioning

confidence: 99%

“…These soils were previously studied (Henriet et al, 2008;Sak et al, 2010;Opfergelt et al, 2012;Clergue et al, 2015) and consist of highly weathered volcanoclastic debris flows containing rocky clasts at various stages of weathering.…”

Section: Climate and Hydrologymentioning

confidence: 99%

“…Surface water was sampled manually from 2007 to 2010 at different hydrological stages corresponding to low water and flood levels (Lloret et al, 2011(Lloret et al, , 2013Dessert et al, 2015). An automatic water sampler, ISCO-6712, was set up on the Capesterre River to sample the largest number of extreme meteorological and hydrological events.…”

Section: River Samplingmentioning

confidence: 99%

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