DOI: 10.1016/j.epsl.2017.11.046
Scopus记录号: 2-s2.0-85040671880
论文题名: Evaluating Late Cretaceous OAEs and the influence of marine incursions on organic carbon burial in an expansive East Asian paleo-lake
作者: Jones M.M. ; Ibarra D.E. ; Gao Y. ; Sageman B.B. ; Selby D. ; Chamberlain C.P. ; Graham S.A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 484 起始页码: 41
结束页码: 52
语种: 英语
英文关键词: carbon isotope chemostratigraphy
; initial osmium isotopes
; lacustrine biogeochemical cycling
; Oceanic Anoxic Event 3 (OAE3)
; paleoclimate
; Songliao Basin
Scopus关键词: Biogeochemistry
; Isotopes
; Lakes
; Osmium
; Stratigraphy
; Weathering
; Biogeochemical cycling
; Chemostratigraphy
; Oceanic Anoxic Event
; Osmium isotopes
; Paleoclimates
; Songliao basin
; Organic carbon
; anoxic conditions
; biogeochemical cycle
; carbon isotope
; chemostratigraphy
; Cretaceous
; lacustrine deposit
; mudstone
; organic carbon
; osmium isotope
; paleoclimate
; paleoenvironment
; China
; Songliao Basin
; Western Interior
英文摘要: Expansive Late Cretaceous lacustrine deposits of East Asia offer unique stratigraphic records to better understand regional responses to global climate events, such as oceanic anoxic events (OAEs), and terrestrial organic carbon burial dynamics. This study presents bulk organic carbon isotopes (δ13Corg), elemental concentrations (XRF), and initial osmium ratios (187Os/188Os, Osi) from the Turonian–Coniacian Qingshankou Formation, a ∼5 Ma lacustrine mudstone succession in the Songliao Basin of northeast China. A notable δ13Corg excursion (∼+2.5‰) in organic carbon-lean Qingshankou Members 2–3 correlates to OAE3 in the Western Interior Basin (WIB) of North America within temporal uncertainty of high-precision age models. Decreases in carbon isotopic fractionation (Δ13C) through OAE3 in the WIB and Songliao Basin, suggest that significantly elevated global rates of organic carbon burial drew down pCO2, likely cooling climate. Despite this, Osi chemostratigraphy demonstrates no major changes in global volcanism or weathering trends through OAE3. Identification of OAE3 in a lake system is consistent with lacustrine records of other OAEs (e.g., Toarcian OAE), and underscores that terrestrial environments were sensitive to climate perturbations associated with OAEs. Additionally, the relatively radiogenic Osi chemostratigraphy and XRF data confirm that the Qingshankou Formation was deposited in a non-marine setting. Organic carbon-rich intervals preserve no compelling Osi evidence for marine incursions, an existing hypothesis for generating Member 1's prolific petroleum source rocks. Based on our results, we present a model for water column stratification and source rock deposition independent of marine incursions, detailing dominant biogeochemical cycles and lacustrine organic carbon burial mechanisms. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110054
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: Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL 60208, United States; Department of Earth System Science, Stanford University, Stanford, CA 94305, United States; State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences and Resources, China University of Geosciences, Beijing, China; Department of Earth Sciences, Durham University, Durham, DH1 3LE, United Kingdom; Department of Geological Sciences, Stanford University, Stanford, CA 94305, United States
Recommended Citation:
Jones M.M.,Ibarra D.E.,Gao Y.,et al. Evaluating Late Cretaceous OAEs and the influence of marine incursions on organic carbon burial in an expansive East Asian paleo-lake[J]. Earth and Planetary Science Letters,2018-01-01,484