气候变化领域集成服务门户(CCPortal): Lipid biomarker distributions in Oligocene and Miocene sediments from the Ross Sea region; Antarctica: Implications for use of biomarker proxies in glacially-influenced settings

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DOI	10.1016/j.palaeo.2018.11.028
	Lipid biomarker distributions in Oligocene and Miocene sediments from the Ross Sea region; Antarctica: Implications for use of biomarker proxies in glacially-influenced settings
	Duncan B.; McKay R.; Bendle J.; Naish T.; Inglis G.N.; Moossen H.; Levy R.; Ventura G.T.; Lewis A.; Chamberlain B.; Walker C.
发表日期	2019
ISSN	0031-0182
起始页码	71
结束页码	89
卷号	516
英文摘要	Biomarker-based climate proxies enable climate and environmental reconstructions for regions where other paleoclimatic approaches are unsuitable. The Antarctic Cenozoic record consists of widely varying lithologies, deposited in rapidly changing depositional settings, with large lateral variations. Previous sedimentological and microfossil studies indicate that the incorporation of reworked older material frequently occurs in these sediments, highlighting the need for an assessment of biomarker distribution across a range of depositional settings and ages to assess the role reworking may have on biomarker-based reconstructions. Here, we compare sedimentary facies with the distribution of n-alkanes and hopanoids within a terrestrial outcrop, two glaciomarine cores and a deep sea core, spanning the Late Oligocene to Miocene in the Ross Sea. Comparisons are also made with n-alkane distributions in Eocene glacial erratics and Mesozoic Beacon Supergroup sediments, which are both potential sources of reworked material. The dominant n-alkane chain length shifts from n-C29 to n-C27 between the Late Eocene and the Oligocene. This shift is likely due to changing plant community composition and the plastic response of n-alkanes to climate cooling. Samples from glaciofluvial environments onshore, and subglacial and ice-proximal environments offshore are more likely to display reworked n-alkane distributions, whereas, samples from lower-energy, lacustrine and ice-distal marine environments predominantly yield immature/contemporaneous n-alkanes. These findings emphasise that careful comparisons with sedimentological and paleontological indicators are essential when applying and interpreting n-alkane-based and other biomarker-based proxies in glacially-influenced settings. © 2018 Elsevier B.V.
英文关键词	Antarctica; Biomarkers; Hopanoids; n-Alkanes; Paleoclimate; Reworking
语种	英语
scopus关键词	alkane; biomarker; Cenozoic; community composition; cooling; deep sea; Eocene; facies; glaciomarine deposit; lacustrine environment; lipid; marine ecosystem; marine environment; Mesozoic; microfossil; Miocene; Oligocene; paleoclimate; plant community; reconstruction; reworking; sediment core; Antarctica; Ross Sea; Southern Ocean
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151111
作者单位	Antarctic Research Centre, Victoria University of Wellington, P.O. Box, Wellington, 6012, New Zealand; School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom; Organic Geochemistry Unit, School of Chemistry and Cabot Institute, University of Bristol, Cantock's Close, Bristol, BS8 1TS, United Kingdom; Geological and Nuclear Sciences, P.O. Box 30-368, Lower Hutt, 5040, New Zealand; North Dakota State University, Fargo, ND 58105, United States
推荐引用方式 GB/T 7714	Duncan B.,McKay R.,Bendle J.,et al. Lipid biomarker distributions in Oligocene and Miocene sediments from the Ross Sea region; Antarctica: Implications for use of biomarker proxies in glacially-influenced settings[J],2019,516.
APA	Duncan B..,McKay R..,Bendle J..,Naish T..,Inglis G.N..,...&Walker C..(2019).Lipid biomarker distributions in Oligocene and Miocene sediments from the Ross Sea region; Antarctica: Implications for use of biomarker proxies in glacially-influenced settings.Palaeogeography, Palaeoclimatology, Palaeoecology,516.
MLA	Duncan B.,et al."Lipid biomarker distributions in Oligocene and Miocene sediments from the Ross Sea region; Antarctica: Implications for use of biomarker proxies in glacially-influenced settings".Palaeogeography, Palaeoclimatology, Palaeoecology 516(2019).