Centennial to millennial variability of greenhouse climate across the mid-Cenomanian event
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- Chao Ma
- Institute of Sedimentary Geology, State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
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- Linda A. Hinnov
- Department of Atmospheric, Oceanic, and Earth Sciences, George Mason University, Fairfax, Virginia 22030, USA
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- James S. Eldrett
- Shell International Exploration and Production, 3333 HW6 S, Houston, Texas 77082, USA
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- Stephen R. Meyers
- Department of Geoscience, University of Wisconsin–Madison, Madison, Wisconsin 53706, USA
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- Steven C. Bergman
- Shell International Exploration and Production, 3333 HW6 S, Houston, Texas 77082, USA
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- Daniel Minisini
- Shell International Exploration and Production, 3333 HW6 S, Houston, Texas 77082, USA
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- Brendan Lutz
- Shell International Exploration and Production, 3333 HW6 S, Houston, Texas 77082, USA
Abstract
<jats:title>Abstract</jats:title> <jats:p>Centennial- to millennial-scale climate variations are often attributed to solar forcing or internal climate system variability, but recognition of such variations in the deep-time paleoclimate record is extremely rare. We present an exceptionally well-preserved, millimeter-scale laminated marlstone from a succession of precession-driven limestone-marlstone couplets deposited in the Western Interior Seaway (North America) immediately preceding and during the Cretaceous mid-Cenomanian event (ca. 96.5 Ma). Sedimentological, geochemical, and micropaleontological data indicate that individual pairs of light-dark laminae record alternations in the extent of water-column mixing and oxygenation. Principal component analysis of X-ray fluorescence element counts and a grayscale scan of a continuous thin section through the marlstone reveal variations with 80–100 yr, 200–230 yr, 350–500 yr, ∼1650 yr, and 4843 yr periodicities. A substantial fraction of the data indicates an anoxic bottom water variation with a pronounced 10,784 yr cycle. The centennial to millennial variations are reminiscent of those found in Holocene total solar irradiance variability, and the 10,784 yr anoxia cycle may be a manifestation of semi-precession-influenced Tethyan oxygen minimum zone waters entering the seaway.</jats:p>
Journal
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- Geology
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Geology 50 (2), 227-231, 2021-11-09
Geological Society of America
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Details 詳細情報について
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- CRID
- 1360580236814482304
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- DOI
- 10.1130/g48734.1
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- ISSN
- 19432682
- 00917613
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- Data Source
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- Crossref