DOI: 10.1016/j.epsl.2019.116057
论文题名: Ferromanganese crusts as recorders of marine dissolved oxygen
作者: Sutherland K.M. ; Wostbrock J.A.G. ; Hansel C.M. ; Sharp Z.D. ; Hein J.R. ; Wankel S.D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 533 语种: 英语
中文关键词: ferromanganese crust
; marine dissolved oxygen
; triple oxygen isotopes
英文关键词: Biogeochemistry
; Chemical analysis
; Dissolution
; Ferroalloys
; Iron ores
; Isotopes
; Manganese nodules
; Manganese removal (water treatment)
; Oceanography
; Sulfur compounds
; Troposphere
; Biogeochemical reactions
; Ferromanganese crusts
; Isotopic composition
; Oxygen isotope values
; Oxygen isotopic composition
; Primary productivity
; Triple oxygen isotope composition
; Triple oxygen isotopes
; Dissolved oxygen
; biogeochemistry
; crust
; deep sea
; dissolved oxygen
; ferromanganese deposit
; isotopic composition
; manganese oxide
; oxygen isotope
; seawater
英文摘要: The distinct triple oxygen isotope composition of tropospheric O2 relative to seawater is the result of biogeochemical reactions (e.g. primary productivity, respiration), exchange with the stratosphere, and the relative size of different oxygen-containing reservoirs, namely O2, O3, and CO2. This difference in isotopic composition gives tropospheric O2 utility as a record of biogeochemical and atmospheric processes and may also be used for determining where in the rock record isotopic fingerprints of tropospheric oxygen may be preserved. The isotopic record of tropospheric oxygen in previous studies is largely limited to analyses of gas trapped in continental glaciers and a patchwork of other proxies, most notably the triple oxygen signature of sulfate. Here we show the uppermost layers of hydrogenetic, deep-ocean ferromanganese crusts from each of the major ocean basins have a triple oxygen isotope composition consistent with the direct incorporation of dissolved oxygen. The range of δ18O and Δ′ 17O in ferromanganese crusts suggests the Mn oxide endmember contains a near 50:50 mixture of oxygen from water and dissolved O2. Our data indicate this signal also persists into older layers of the crusts, potentially preserving near 75 million years of the oxygen isotopic composition of the lower troposphere and subsequent deep-ocean respiration. Our analysis of oxygen isotope values, bulk chemistry, and estimated local dissolved oxygen for crust top samples reveals that variations in bulk chemistry ultimately exhibit more influence on the oxygen mass balance than changes in dissolved oxygen, presenting a challenge for unambiguous determination of local dissolved oxygen. Although analytical challenges remain, these widespread, layered deposits of ferromanganese crust may offer a viable path for future interrogation of the history or relative history of the oxygen cycle of the troposphere and deep ocean millions of years into the past. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165299
Appears in Collections: 气候变化与战略
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作者单位: Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, 266 Woods Hole Road, Woods Hole, MA 02543, United States; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States; Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, United States; Pacific Coastal and Marine Science Center, US Geological Survey, 2885 Mission St., Santa Cruz, CA 95060, United States
Recommended Citation:
Sutherland K.M.,Wostbrock J.A.G.,Hansel C.M.,et al. Ferromanganese crusts as recorders of marine dissolved oxygen[J]. Earth and Planetary Science Letters,2020-01-01,533