气候变化领域集成服务门户(CCPortal): Ferromanganese crusts as recorders of marine dissolved oxygen

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DOI	10.1016/j.epsl.2019.116057
	Ferromanganese crusts as recorders of marine dissolved oxygen
	Sutherland K.M.; Wostbrock J.A.G.; Hansel C.M.; Sharp Z.D.; Hein J.R.; Wankel S.D.
发表日期	2020
ISSN	0012821X
卷号	533
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202921
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
推荐引用方式 GB/T 7714	Sutherland K.M.,Wostbrock J.A.G.,Hansel C.M.,et al. Ferromanganese crusts as recorders of marine dissolved oxygen[J],2020,533.
APA	Sutherland K.M.,Wostbrock J.A.G.,Hansel C.M.,Sharp Z.D.,Hein J.R.,&Wankel S.D..(2020).Ferromanganese crusts as recorders of marine dissolved oxygen.Earth and Planetary Science Letters,533.
MLA	Sutherland K.M.,et al."Ferromanganese crusts as recorders of marine dissolved oxygen".Earth and Planetary Science Letters 533(2020).