DOI: 10.1002/2016GL067711
论文题名: Riverine dissolved lithium isotopic signatures in low-relief central Africa and their link to weathering regimes
作者: Henchiri S. ; Gaillardet J. ; Dellinger M. ; Bouchez J. ; Spencer R.G.M.
刊名: Geophysical Research Letters
ISSN: 0094-9059
EISSN: 1944-8790
出版年: 2016
卷: 43, 期: 9 起始页码: 4391
结束页码: 4399
语种: 英语
英文关键词: blackwater river
; lithium isotopes
; topography
; weathering
Scopus关键词: Dissolution
; Lithium
; Rivers
; Topography
; Weathering
; Blackwater
; Congruent dissolutions
; Continental crusts
; Isotopic composition
; Isotopic signatures
; Lithium isotopes
; Strontium isotopes
; Weathering regimes
; Isotopes
英文摘要: The isotopic composition of dissolved lithium (δ7Li) near the Congo River mouth varied from 14‰ to 22‰ in 2010 and was negatively correlated to discharge. From the relationship between dissolved δ7Li and strontium isotopes, we suggest that this large variation is due to mixing of waters from two contrasting continental weathering regimes. One end-member (high δ7Li ≈ 25‰) represents waters sourced from active lateritic soils covering the periphery of the basin (Li highly sequestered into secondary mineral products) and another representing blackwater rivers (low δ7Li ≈ 5.7‰) derived from the swampy central depression where high organic matter content in water leads to congruent dissolution of the Tertiary sedimentary bedrock. This suggests that the lithium isotopic signature of tropical low-relief surfaces is not unique and traces the long-term, large-scale vertical motions of the continental crust that control geomorphological settings. This evolution should be recorded in the oceanic secular δ7Li curve. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84966355774&doi=10.1002%2f2016GL067711&partnerID=40&md5=2ebe2ab916a5d4f8181e745adc7aa95c
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10022
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, CNRS, Paris, France
Recommended Citation:
Henchiri S.,Gaillardet J.,Dellinger M.,et al. Riverine dissolved lithium isotopic signatures in low-relief central Africa and their link to weathering regimes[J]. Geophysical Research Letters,2016-01-01,43(9).