Constraints on the role of tectonic and climate on erosion revealed by two time series analysis of marine cores around New Zealand

Cogez, Antoine; Meynadier, L.; Allègre, Claude J.; Limmois, D.; Herman, Frédéric; Gaillardet, Jérôme

doi:10.1016/j.epsl.2014.11.029

Cited by 31 publications

(14 citation statements)

References 91 publications

(121 reference statements)

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“…Nd isotopes: Nd isotope composition was measured in the same aliquot used for Li isotopes. Nd was separated from the rest of the matrix by ion-exchange chromatography using the TRU-spec and Ln-spec resins and measured by MC ICP-MS Neptune in IPGP following the method described in Cogez et al, (2015).…”

Section: Methodsmentioning

confidence: 99%

Tracing weathering regimes using the lithium isotope composition of detrital sediments

Dellinger

Bouchez

Gaillardet

et al. 2017

Geology

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Citation for published item:hellingerD wthieu nd fouhezD tulien nd qillrdetD t¡ er¢ ome nd pureD vetiti nd woureuD tulien @PHIUA 9ring wethering regimes using the lithium isotope omposition of detritl sedimentsF9D qeologyFD RS @SAF ppF RIIERIRF Further information on publisher's website: httpsXGGdoiForgGIHFIIQHGqQVTUIFI Publisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. ABSTRACT 9Lithium (Li) isotopes are a promising tracer of chemical weathering processes for 10 both modern and ancient times. In order to improve the use of Li isotopes in the 11 sedimentary record, here we calibrate the relationship between weathering intensity and 12 detrital Li isotope composition ( 7 Li) using the fine fraction of modern large river 13 sediments. By using independent estimates for sediment provenance to calculate the Li 14 isotope signature of the rock from which the sediments derive through weathering, we 15show that source rock variability (in particular the relative contribution of sedimentary vs. 16 igneous rocks) must be corrected for before using Li isotopes as a weathering proxy. We 17 also show that for rivers draining mountain ranges, the contribution of particles derived 18 from sedimentary rocks to river sediments is correlated to their Li/Al ratio, making it 19 possible to use Li contents to estimate the average source rock composition. Once 20 corrected for bedrock variability, the Li isotope signature defines a negative relationship 21 with the weathering intensity (ratio between silicate weathering rate and total denudation 22 Page 2 of 17 rate) with highest Li isotope fractionation for the highest weathering intensity. 23Altogether, we propose a set of new relationships between weathering, erosion, 24 provenance and Li isotopes that can be used to quantify present-day and paleo-25 weathering using detrital sediment.

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Section: Methodsmentioning

confidence: 99%

Tracing weathering regimes using the lithium isotope composition of detrital sediments

Dellinger

Bouchez

Gaillardet

et al. 2017

Geology

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“…The key challenge, however, is to separate this ventilation effect from any changes in local detrital composition and reactivity. For example, previous studies suggested authigenic εNd could record events of changing sediment composition and were used as proxies for continental weathering, erosion and sediment provenance rather than circulation (Le Houedec et al, 2012;Cogez et al, 2015). Therefore, it is of fundamental importance to measure authigenic and detrital εNd concurrently.…”

Section: Implication For εNd In Paleoceanographymentioning

confidence: 99%

Neodymium isotopes in authigenic phases, bottom waters and detrital sediments in the Gulf of Alaska and their implications for paleo-circulation reconstruction

Haley

Mix

2016

Geochimica et Cosmochimica Acta

100

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The isotopic composition of neodymium (εNd) extracted from sedimentary Fe-Mn oxyhydroxide offers potential for reconstructing paleo-circulation, but its application depends on extraction methodology and the mechanisms that relate authigenic εNd to bottom water. Here we test methods to extract authigenic εNd from Gulf of Alaska (GOA) sediments and assess sources of leachate Nd, including potential contamination from trace dispersed volcanic ash. We show that one dominant phase is extracted via leaching of core-top sediments. Major and trace element geochemistry demonstrate that this phase is authigenic Fe-Mn oxyhydroxide. Contamination of leachate (authigenic) Nd from detrital sources is insignificant (<1%); our empirical results are consistent with established kinetic mineral dissolution rates and theory. Contamination of extracted εNd from leaching of volcanic ash is below analytical uncertainty. However, the εNd of core-top leachates in the GOA is consistently more radiogenic than bottom water. We infer that authigenic phases record pore water εNd, and the relationships of εNd among bottom water, pore water, authigenic phases and detrital sediments are primarily governed by the exposure time of bottom water to sea-floor sediments, rate of exchange across the sediment-water interface and the reactivity and composition of detrital sediments. We show that this conceptual model is applicable on the Pacific basin scale and provides a new framework to understand the role of authigenic phases in both modern and paleo-applications including the use of authigenic εNd as a paleocirculation tracer.

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“…Simultaneously, landscape evolution depends strongly on climate, vegetation, tectonic uplift, and, since the expansion of human settlements and technological advancements, on land use (e.g. Cogez et al 2015;Marston 2010;Dotterweich 2008). In the light of anthropogenic climate warming and increasing land use, soils, one of our most important but finite resources, are expected to experience considerable modifications in the near future.…”

Section: Introductionmentioning

confidence: 99%

Geochemical methods to infer landscape response to Quaternary climate change and land use in depositional archives: A review

Holtvoeth

Codilean

Lacey

et al. 2020

Earth-Science Reviews

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Understanding and quantifying the processes and geochemical cycles associated with catchment erosion, the development of soils and weathering horizons, and terrestrial habitat change beyond the scales of modern observations remain challenging. Such research, however, has become increasingly important to help predict future landscape change in light of increasing land use and rapid global warming. We herein review organic and inorganic geochemical tools applied to depositional archives to better understand various aspects of landscape evolution on geological time scales. We highlight the potentials and limitations of inorganic geochemical analytical methods, such as major element geochemistry, metal and radiogenic isotopes, and in-situ cosmogenic nuclides, as qualitative, semi-quantitative, and quantitative proxies for the transformation of bedrock material via regolith and soils to sediments. We also show how stable isotope geochemistry applied to lacustrine endogenic carbonates can be used to infer rock-water interactions, vegetation change, and soil development in limestone-rich catchments. Proxies focusing on the silicilastic element of sediment formation, transport and deposition are also ideally combined with organic geochemical proxies for vegetation change and soil organic matter evolution in a catchment to gain a comprehensive picture of the Critical Zone's evolution over time. Multi-proxy and multidisciplinary research combining organic and inorganic geochemical techniques from several sedimentary archives in the same catchment have high potential to provide comprehensive information on Quaternary landscape evolution and thus improve the robustness of associated forecasting models.

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Constraints on the role of tectonic and climate on erosion revealed by two time series analysis of marine cores around New Zealand

Cited by 31 publications

References 91 publications

Tracing weathering regimes using the lithium isotope composition of detrital sediments

Tracing weathering regimes using the lithium isotope composition of detrital sediments

Neodymium isotopes in authigenic phases, bottom waters and detrital sediments in the Gulf of Alaska and their implications for paleo-circulation reconstruction

Geochemical methods to infer landscape response to Quaternary climate change and land use in depositional archives: A review

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