DOI: 10.1016/j.quascirev.2018.04.021
Scopus记录号: 2-s2.0-85046644895
论文题名: Holocene provenance shift of suspended particulate matter in the Amazon River basin
作者: Höppner N. ; Lucassen F. ; Chiessi C.M. ; Sawakuchi A.O. ; Kasemann S.A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 190 起始页码: 66
结束页码: 80
语种: 英语
英文关键词: Amazon River basin
; Holocene
; Paleoclimatology
; Provenance
; Radiogenic isotopes
; South America
; Suspended particulate matter
Scopus关键词: Catchments
; Geochronology
; Isotopes
; Sediments
; Submarine geology
; Watersheds
; Amazon river
; Holocenes
; Paleoclimatology
; Provenance
; Radiogenic isotopes
; South America
; Suspended particulate matters
; Rivers
; chemical composition
; chemical element
; concentration (composition)
; Holocene
; isotopic composition
; last deglaciation
; lead isotope
; marine sediment
; neodymium isotope
; paleoclimate
; provenance
; sediment chemistry
; sediment core
; strontium isotope
; suspended load
; suspended particulate matter
; Amazon Basin
; Andes
; Brazil
; French Guiana
; Madeira River
; South America
英文摘要: The strontium (Sr), neodymium (Nd) and lead (Pb) isotope signatures of suspended particulate matter (SPM) in rivers reflect the radiogenic isotope signatures of the rivers’ drainage basin. These signatures are not significantly affected by weathering, transport or depositional cycles, but document the sedimentary contributions of the respective sources. We report new Sr, Nd and Pb isotope ratios and element concentrations of modern SPM from the Brazilian Amazon River basin and document the past evolution of the basin by analyzing radiogenic isotopes of a marine sediment core from the slope off French Guiana archiving the last 40 kyr of Amazon River SPM, and the Holocene section of sediment cores raised between the Amazon River mouth and the slope off French Guiana. The composition of modern SPM confirms two main source areas, the Andes and the cratonic Shield. In the marine sediment core notable changes occurred during the second phase of Heinrich Stadial 1 (i.e. increased proportion of Shield rivers SPM) and during the last deglaciation (i.e. increased proportion of Madeira River SPM) together with elsewhere constant source contributions. Furthermore, we report a prominent offset in Sr and Nd isotopic composition between the average core value (εNd: −11.7 ± 0.9 (2SD), 87Sr/86Sr: 0.7229 ± 0.0016 (2SD)) and the average modern Amazon River SPM signal (εNd: −10.5 ± 0.5 (2SD), 87Sr/86Sr: 0.7213 ± 0.0036 (2SD)). We suggest that a permanent change in the Amazon River basin sediment supply during the late Holocene to a more Andean dominated SPM was responsible for the offset. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112180
Appears in Collections: 气候减缓与适应
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作者单位: MARUM – Center for Marine Environmental Sciences and Faculty of Geosciences, University of Bremen, Leobener Str. 8, Bremen, 28359, Germany; School of Arts, Sciences and Humanities, University of São Paulo, Rua Arlindo Bettio, 1000, São Paulo, CEP03828-000, Brazil; Institute of Geosciences, University of São Paulo, Rua do Lago, 562, São Paulo, CEP05508-080, Brazil
Recommended Citation:
Höppner N.,Lucassen F.,Chiessi C.M.,et al. Holocene provenance shift of suspended particulate matter in the Amazon River basin[J]. Quaternary Science Reviews,2018-01-01,190