DOI: 10.1016/j.epsl.2018.03.040
Scopus记录号: 2-s2.0-85044962576
论文题名: Barium isotopes in cold-water corals
作者: Hemsing F. ; Hsieh Y.-T. ; Bridgestock L. ; Spooner P.T. ; Robinson L.F. ; Frank N. ; Henderson G.M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 491 起始页码: 183
结束页码: 192
语种: 英语
英文关键词: Ba/Ca
; barium isotope fractionation
; calibration
; cold-water corals
; paleoceanography
Scopus关键词: Calibration
; Carbonate minerals
; Hot springs
; Isotopes
; Oceanography
; Seawater
; Cold-water corals
; Environmental variables
; Hydrothermal vent
; Isotope compositions
; Isotope fractionation
; Land-sea interactions
; Paleoceanography
; Partition coefficient
; Barium
; Anthozoa
英文摘要: Recent studies have introduced stable Ba isotopes (δ138/134Ba) as a novel tracer for ocean processes. Ba isotopes could potentially provide insight into the oceanic Ba cycle, the ocean's biological pump, water-mass provenance in the deep ocean, changes in activity of hydrothermal vents, and land-sea interactions including tracing riverine inputs. Here, we show that aragonite skeletons of various colonial and solitary cold-water coral (CWC) taxa record the seawater (SW) Ba isotope composition. Thirty-six corals of eight different taxa from three oceanic regions were analysed and compared to δ138/134Ba measurements of co-located seawater samples. Sites were chosen to cover a wide range of temperature, salinity, Ba concentrations and Ba isotope compositions. Seawater samples at the three sites exhibit the well-established anti-correlation between Ba concentration and δ138/134Ba. Furthermore, our data set suggests that Ba/Ca values in CWCs are linearly correlated with dissolved [Ba] in ambient seawater, with an average partition coefficient of DCWC/SW = 1.8 ± 0.4 (2SD). The mean isotope fractionation of Ba between seawater and CWCs Δ138/134BaCWC–SW is −0.21 ± 0.08‰ (2SD), indicating that CWC aragonite preferentially incorporates the lighter isotopes. This fractionation likely does not depend on temperature or other environmental variables, suggesting that aragonite CWCs could be used to trace the Ba isotope composition in ambient seawater. Coupled [Ba] and δ138/134Ba analysis on fossil CWCs has the potential to provide new information about past changes in the local and global relationship between [Ba] and δ138/134Ba and hence about the operation of the past global oceanic Ba cycle in different climate regimes. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109928
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Institute of Environmental Physics, Heidelberg University, Im Neuenheimer Feld 229, Heidelberg, 69120, Germany; Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, United Kingdom; School of Earth Sciences, University of Bristol, Queens Rd., Bristol, BS8 1RJ, United Kingdom
Recommended Citation:
Hemsing F.,Hsieh Y.-T.,Bridgestock L.,et al. Barium isotopes in cold-water corals[J]. Earth and Planetary Science Letters,2018-01-01,491