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学科主题: Geochemistry & Geophysics
题名: Astrochronology of the late Jurassic Kimmeridge Clay (Dorset, England) and implications for Earth system processes
作者: Huang, CJ ; Hesselbo, SP ; Hinnov, L
通讯作者: hinnov@jhu.edu
关键词: Kimmeridgian ; Tithonian ; Dorset ; cyclostratigraphy ; seafloor spreading ; sequence stratigraphy
刊名: EARTH AND PLANETARY SCIENCE LETTERS
发表日期: 2010
卷: 289, 期:40545, 页:242-255
收录类别: sci
部门归属: [Huang, Chunju; Hinnov, Linda] Johns Hopkins Univ, Dept Earth & Planetary Sci, Baltimore, MD 21218 USA; [Huang, Chunju; Hesselbo, Stephen P.] Univ Oxford, Dept Earth Sci, Oxford OX1 3PR, England; [Huang, Chunju] Chinese Acad Sci, Key Lab Marginal Sea Geol, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China
项目归属: 海洋地质
摘要: The Late Jurassic Kimmeridge Clay Formation (KCF) is an economically important, organic-rich source rock of Kimmeridgian-Early Tithonian age. The main rock types of the KCF in Dorset, UK, include grey to black laminated shale, marl, coccolithic limestone, and dolostone, which occur with an obvious cyclicity at astronomical timescales. In this study, we examine two high-resolution borehole records (Swanworth Quarry I and Metherhills 1) obtained as part of a Rapid Global Geological Events (RGGE) sediment drilling project. Datasets examined were total organic carbon (TOC), and borehole wall microconductivity by Formation Microscanner (FMS). Our intent is to assess the rhythmicity of the KCF with respect to the astronomical timescale, and to discuss the results with respect to other key Late Jurassic geological processes. Power spectra of the untuned data reveal a hierarchy of cycles throughout the KCF with similar to 167 m, similar to 40 m, 9.1 m. 3.8 m and 1.6 m wavelengths. Tuning the similar to 40 m cycles to the 405-kyr eccentricity cycle shows the presence of all the astronomical parameters: eccentricity, obliquity, and precession index. In particular, similar to 100-kyr and 405-kyr eccentricity cycles are strongly expressed in both records. The 405-kyr eccentricity cycle corresponds to relative sea-level changes inferred from sequence stratigraphy. Intervals with elevated TOC are associated with strong obliquity forcing. The 405-kyr-tuned duration of the lower KCF (Kimmeridgian Stage) is 3.47 Myr, and the upper KCF (early part of the Tithonian Stage, elegans to fittoni ammonite zones) is 3.32 Myr. Two other chronologies test the consistency of this age model by tuning similar to 8-10 m cycles to 100-kyr (short eccentricity), and similar to 3-5 m cycles to 36-kyr (Jurassic obliquity). The 'obliquity-tuned' chronology resolves an accumulation history for the KCF with a variation that strongly resembles that of Earth's orbital eccentricity predicted for 147.2 Ma to 153.8 Ma. There is evidence for significant non-deposition (up to I million years) in the lowermost KCF (baylei-mutabilis zones), which would indicate a Kimmeridgian/Oxfordian boundary age of 154.8 Ma. This absolute calibration allows assignment of precise numerical ages to zonal boundaries, sequence surfaces, and polarity chrons of the lower M-sequence. (C) 2009 Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000274178000024
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4348
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Huang, CJ; Hesselbo, SP; Hinnov, L.Astrochronology of the late Jurassic Kimmeridge Clay (Dorset, England) and implications for Earth system processes,EARTH AND PLANETARY SCIENCE LETTERS,2010,289(40545):242-255
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