DOI: 10.5194/cp-13-149-2017
Scopus记录号: 2-s2.0-85014011888
论文题名: A record of Neogene seawater δ11B reconstructed from paired δ11B analyses on benthic and planktic foraminifera
作者: Greenop R. ; Hain M.P. ; Sosdian S.M. ; Oliver K.I.C. ; Goodwin P. ; Chalk T.B. ; Lear C.H. ; Wilson P.A. ; Foster G.L.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2017
卷: 13, 期: 2 起始页码: 149
结束页码: 170
语种: 英语
Scopus关键词: benthic foraminifera
; boron isotope
; calcite
; carbon cycle
; carbon isotope
; isotopic analysis
; isotopic composition
; Miocene
; Neogene
; paleoceanography
; proxy climate record
; reconstruction
; seawater
; Foraminifera
英文摘要: The boron isotope composition (δ11B) of foraminiferal calcite reflects the pH and the boron isotope composition of the seawater the foraminifer grew in. For pH reconstructions, the δ11B of seawater must therefore be known, but information on this parameter is limited. Here we reconstruct Neogene seawater δ11B based on the δ11B difference between paired measurements of planktic and benthic foraminifera and an estimate of the coeval water column pH gradient from their δ13C values. Carbon cycle model simulations underscore that the ΔpH-Δδ13C relationship is relatively insensitive to ocean and carbon cycle changes, validating our approach. Our reconstructions suggest that δ11Bsw was ∼37.5‰ during the early and middle Miocene (roughly 23-12 Ma) and rapidly increased during the late Miocene (between 12 and 5 Ma) towards the modern value of 39.61 ‰. Strikingly, this pattern is similar to the evolution of the seawater isotope composition of Mg, Li and Ca, suggesting a common forcing mechanism. Based on the observed direction of change, we hypothesize that an increase in secondary mineral formation during continental weathering affected the isotope composition of riverine input to the ocean since 14 Ma. © 2017 Author(s). CC Attribution 3.0 License. 资助项目: NERC, National Eye Research Centre
; NERC, National Eye Research Centre
; NERC, National Eye Research Centre
; NERC, National Eye Research Centre
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48941
Appears in Collections: 气候变化与战略
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Recommended Citation:
Greenop R.,Hain M.P.,Sosdian S.M.,et al. A record of Neogene seawater δ11B reconstructed from paired δ11B analyses on benthic and planktic foraminifera[J]. Climate of the Past,2017-01-01,13(2)