DOI: 10.1016/j.epsl.2017.11.053
Scopus记录号: 2-s2.0-85044747528
论文题名: Molybdenum isotope behaviour in groundwaters and terrestrial hydrothermal systems, Iceland
作者: Neely R.A. ; Gislason S.R. ; Ólafsson M. ; McCoy-West A.J. ; Pearce C.R. ; Burton K.W.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 486 起始页码: 108
结束页码: 118
语种: 英语
英文关键词: groundwater
; hydrothermal
; Mo isotopes
; ocean mass balance
Scopus关键词: Basalt
; Budget control
; Dissolution
; Isotopes
; Molybdenum
; Oceanography
; Sulfur compounds
; Ground water discharge
; hydrothermal
; Hydrothermal fluids
; Hydrothermal process
; Hydrothermal system
; Incongruent dissolutions
; Mass balance
; Molybdenum isotopes
; Groundwater
; dissolution
; groundwater
; hydrothermal fluid
; hydrothermal system
; isotopic composition
; molybdenum
; reconstruction
; redox conditions
英文摘要: Molybdenum (Mo) isotopes have proved useful in the reconstruction of paleoredox conditions. Their application generally relies upon a simplified model of ocean inputs in which rivers dominate Mo fluxes to the oceans and hydrothermal fluids are considered to be a minor contribution. To date, however, little attention has been paid to the extent of Mo isotope variation of hydrothermal waters, or to the potential effect of direct groundwater discharge to the oceans. Here we present Mo isotope data for two Icelandic groundwater systems (Mývatn and Þeistareykir) that are both influenced by hydrothermal processes. Relative to NIST 3134 = +0.25‰, the cold (<10 °C) groundwaters (δ98/95MoGROUNDWATER = −0.15‰ to +0.47‰; n=13) show little, if any, fractionation from the host basalt (δ98/95MoBASALT = +0.16‰ to −0.12‰) and are, on average, lighter than both global and Icelandic rivers. In contrast, waters that are hydrothermally influenced (>10 °C) possess isotopically heavy δ98/95MoHYDROTHERMAL values of +0.25‰ to +2.06‰ (n=18) with the possibility that the high temperature endmembers are even heavier. Although the mechanisms driving this fractionation remain unresolved, the incongruent dissolution of the host basalt and both the dissolution and precipitation of sulfides are considered. Regardless of the processes driving these variations, the δ98Mo data presented in this study indicate that groundwater and hydrothermal waters have the potential to modify ocean budget calculations. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110032
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Institute of Earth Science, University of Iceland, Reykjavík, IS-101, Iceland; ÍSOR, Iceland GeoSurvey, Orkugardur, Grensásvegur 9, Reykjavík, IS-109, Iceland; Department of Earth Science, Durham University, Science Labs, Durham, DH1 3LE, United Kingdom; National Oceanography Centre Southampton, University of Southampton Waterfront Campus, European Way, Southampton, SO14 3ZH, United Kingdom
Recommended Citation:
Neely R.A.,Gislason S.R.,Ólafsson M.,et al. Molybdenum isotope behaviour in groundwaters and terrestrial hydrothermal systems, Iceland[J]. Earth and Planetary Science Letters,2018-01-01,486