globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1912094117
论文题名:
Orbital pacing and secular evolution of the Early Jurassic carbon cycle
作者: Storm M.S.; Hesselbo S.P.; Jenkyns H.C.; Ruhl M.; Ullmann C.V.; Xu W.; Leng M.J.; Riding J.B.; Gorbanenko O.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:8
起始页码: 3974
结束页码: 3982
语种: 英语
英文关键词: Astrochronology ; Early Jurassic ; Global carbon cycle ; δ13CTOC
Scopus关键词: calcium carbonate ; organic matter ; Article ; carbon cycle ; carbon footprint ; evolution ; geography ; information processing ; isotope analysis ; Lower Jurassic ; priority journal ; sediment ; Triassic ; United Kingdom
英文摘要: Global perturbations to the Early Jurassic environment (∼201 to ∼174 Ma), notably during the Triassic–Jurassic transition and Toarcian Oceanic Anoxic Event, are well studied and largely associated with volcanogenic greenhouse gas emissions released by large igneous provinces. The long-term secular evolution, timing, and pacing of changes in the Early Jurassic carbon cycle that provide context for these events are thus far poorly understood due to a lack of continuous high-resolution δ13C data. Here we present a δ13CTOC record for the uppermost Rhaetian (Triassic) to Pliensbachian (Lower Jurassic), derived from a calcareous mudstone succession of the exceptionally expanded Llanbedr (Mochras Farm) borehole, Cardigan Bay Basin, Wales, United Kingdom. Combined with existing δ13CTOC data from the Toarcian, the compilation covers the entire Lower Jurassic. The dataset reproduces large-amplitude δ13CTOC excursions (>3％) recognized elsewhere, at the Sinemurian–Pliensbachian transition and in the lower Toarcian serpentinum zone, as well as several previously identified medium-amplitude (∼0.5 to 2％) shifts in the Hettangian to Pliensbachian interval. In addition, multiple hitherto undiscovered isotope shifts of comparable amplitude and stratigraphic extent are recorded, demonstrating that those similar features described earlier from stratigraphically more limited sections are nonunique in a long-term context. These shifts are identified as long-eccentricity (∼405-ky) orbital cycles. Orbital tuning of the δ13CTOC record provides the basis for an astrochronological duration estimate for the Pliensbachian and Sinemurian, giving implications for the duration of the Hettangian Stage. Overall the chemostratigraphy illustrates particular sensitivity of the marine carbon cycle to long-eccentricity orbital forcing. © 2020 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164313
Appears in Collections:气候变化与战略

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作者单位: Storm, M.S., Department of Earth Sciences, Stellenbosch University, Stellenbosch, 7600, South Africa, Department of Earth Sciences, University of Oxford, Oxford, OX1 3AN, United Kingdom; Hesselbo, S.P., Camborne School of Mines, University of Exeter, Penryn, TR10 9FE, United Kingdom, Environment and Sustainability Institute, University of Exeter, Penryn, TR10 9FE, United Kingdom; Jenkyns, H.C., Department of Earth Sciences, University of Oxford, Oxford, OX1 3AN, United Kingdom; Ruhl, M., Department of Earth Sciences, University of Oxford, Oxford, OX1 3AN, United Kingdom, Department of Geology, Trinity College Dublin, University of Dublin, Dublin 2, Ireland; Ullmann, C.V., Camborne School of Mines, University of Exeter, Penryn, TR10 9FE, United Kingdom, Environment and Sustainability Institute, University of Exeter, Penryn, TR10 9FE, United Kingdom; Xu, W., Department of Earth Sciences, University of Oxford, Oxford, OX1 3AN, United Kingdom, Department of Botany, Trinity College Dublin, University of Dublin, Dublin 2, Ireland; Leng, M.J., Environmental Science Centre, British Geological Survey, Nottingham, NG12 5GG, United Kingdom, School of Biosciences, University of Nottingham, Loughborough, LE12 5RD, United Kingdom; Riding, J.B., Environmental Science Centre, British Geological Survey, Nottingham, NG12 5GG, United Kingdom; Gorbanenko, O., Department of Earth Sciences, University of Oxford, Oxford, OX1 3AN, United Kingdom

Recommended Citation:
Storm M.S.,Hesselbo S.P.,Jenkyns H.C.,et al. Orbital pacing and secular evolution of the Early Jurassic carbon cycle[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(8)
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