globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.08.036
论文题名:
Vascular plant biomarker distributions and stable carbon isotopic signatures from the Middle and Upper Jurassic (Callovian-Kimmeridgian) strata of Staffin Bay, Isle of Skye, northwest Scotland
作者: Grice K.; Riding J.B.; Foster C.B.; Naeher S.; Greenwood P.F.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 440
起始页码: 307
结束页码: 315
语种: 英语
英文关键词: Biomarkers ; Higher plant parameters ; Jurassic ; Palynology ; Sea level ; Stable carbon isotopes
英文摘要: The molecular and stable carbon isotopic composition of higher plant biomarkers was investigated in Middle to Upper Jurassic strata of the Isle of Skye, northwest Scotland. Aromatic hydrocarbons diagnostic of vascular plants were detected in each of nineteen sedimentary rock samples from the Early Callovian to Early Kimmeridgian interval, a succession rich in fossil fauna including ammonites that define its constituent chronozones. The higher plant parameter (HPP) and higher plant fingerprint (HPF) calculated from the relative abundance of retene, cadalene and 6-isopropyl-1-isohexyl-2-methylnaphthalene (ip-iHMN) exhibit several large fluctuations throughout the Skye succession studied. These molecular profiles contrast with both (1) the more uniform profiles previously observed in Jurassic successions, putatively of the same age, from other palaeogeographical settings, including the Carnarvon Basin, Western Australia and (2) the steady rise in global sea level during this interval. This suggests that the HPF profiles of Jurassic marine successions may not be reliable indicators of global climate change. Our results indicate that other factors such as local tectonism, resulting in changes to the relief and landscape of the hinterland, likely influenced the palaeoflora and the mode of transport of its detritus into adjacent marine depocentres. However, the Skye succession showed similar δ13C profiles of total organic carbon (TOC; comprising mainly fossil wood), the vascular plant biomarker retene and a predominant phytoplanktonic biomarker (phytane). The apparent isotopic relationship between terrigenous and marine-derived biomarkers supports a strong coupling of the atmosphere and ocean. The maximum isotopic excursion occurs in the Cardioceras cordatum ammonite biozone of the Early to Middle Oxfordian, which may be indicative of changes in atmospheric and oceanic levels of CO2. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68720
Appears in Collections:过去全球变化的重建

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作者单位: WA Organic and Isotope Geochemistry Centre, The Institute for Geoscience Research, Department of Chemistry, Curtin University, GPO Box U1987, Perth, WA, Australia; British Geological Survey, Environmental Science Centre, Keyworth, Nottingham, United Kingdom; Geoscience Australia, GPO Box 378, Canberra, ACT, Australia; School of Earth and Environment, The University of Western Australia, 35 Stirling Highway, Crawley, WA, Australia; Centre for Exploration Targeting and WA Biogeochemistry Centre (M090), The University of Western Australia, 35 Stirling Highway, Crawley, WA, Australia

Recommended Citation:
Grice K.,Riding J.B.,Foster C.B.,et al. Vascular plant biomarker distributions and stable carbon isotopic signatures from the Middle and Upper Jurassic (Callovian-Kimmeridgian) strata of Staffin Bay, Isle of Skye, northwest Scotland[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,440
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