气候变化领域集成服务门户(CCPortal): Did early land plants produce a stepwise change in atmospheric oxygen during the Late Ordovician (Sandbian ~458 Ma)?

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DOI	10.1016/j.palaeo.2019.109341
	Did early land plants produce a stepwise change in atmospheric oxygen during the Late Ordovician (Sandbian ~458 Ma)?
	Adiatma Y.D.; Saltzman M.R.; Young S.A.; Griffith E.M.; Kozik N.P.; Edwards C.T.; Leslie S.A.; Bancroft A.M.
发表日期	2019
ISSN	0031-0182
卷号	534
英文摘要	A stepwise change in atmospheric oxygen (O2) levels during the Ordovician has been attributed to the emergence of land plants. This phenomenon is tied to a major baseline shift in the stable carbon isotope (δ13C) curve and inferred increase in nutrient delivery and enhanced primary productivity in nearshore settings, which led to high organic carbon burial. The timing and magnitude of this baseline shift, however, is still elusive in part because of the lack of high-resolution δ13C data that span this period. Much of the existing Ordovician δ13C literature is focused on isotopic excursions with less emphasis on identifying long-term shifts in baseline (pre- and post-excursion) values. This study presents new high resolution δ13C data from stratigraphic sections at Germany Valley (West Virginia) and Union Furnace (Pennsylvania) in the Central Appalachian Basin. These sections span the entire Sandbian Stage and continue into the lower Katian Stage. The δ13C data from both sections are characterized by relative stability carbon isotope values (mean = −0.61‰) in the lower Sandbian, followed by a + 1.2‰ shift in the upper Sandbian (mean = +0.62‰). Herein, we propose that the positive shift represents a long-term global shift in baseline δ13C values of dissolved inorganic carbon. The timing of this positive shift coinciding with the diversification of early land plants (i.e., bryophytes) supports earlier models that suggested enhanced organic carbon burial rates served as a mechanism for the stepwise oxygenation of the atmosphere during the Late Ordovician. © 2019 Elsevier B.V.
英文关键词	Appalachian Basin; Carbon isotopes; Chemostratigraphy; Land plants; Oxygenation; Strontium isotopes
语种	英语
scopus关键词	burial diagenesis; carbon isotope; chemostratigraphy; emergence; isotopic analysis; isotopic composition; Ordovician; organic carbon; oxygen; oxygenation; primary production; stable isotope; Appalachian Basin; Pennsylvania; United States; West Virginia; bryophytes; Embryophyta
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150783
作者单位	School of Earth Sciences, The Ohio State University, Columbus, OH, United States; Department of Earth, Ocean, and Atmospheric Science, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, United States; Department of Geological and Environmental Sciences, Appalachian State University, Boone, NC, United States; Department of Geology and Environmental Science, James Madison University, Harrisonburg, VA, United States; Indiana Geological and Water Survey, Indiana University, Bloomington, IN, United States
推荐引用方式 GB/T 7714	Adiatma Y.D.,Saltzman M.R.,Young S.A.,et al. Did early land plants produce a stepwise change in atmospheric oxygen during the Late Ordovician (Sandbian ~458 Ma)?[J],2019,534.
APA	Adiatma Y.D..,Saltzman M.R..,Young S.A..,Griffith E.M..,Kozik N.P..,...&Bancroft A.M..(2019).Did early land plants produce a stepwise change in atmospheric oxygen during the Late Ordovician (Sandbian ~458 Ma)?.Palaeogeography, Palaeoclimatology, Palaeoecology,534.
MLA	Adiatma Y.D.,et al."Did early land plants produce a stepwise change in atmospheric oxygen during the Late Ordovician (Sandbian ~458 Ma)?".Palaeogeography, Palaeoclimatology, Palaeoecology 534(2019).