气候变化领域集成服务门户(CCPortal): Biomarker constraints on Mediterranean climate and ecosystem transitions during the Early-Middle Miocene

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DOI	10.1016/j.palaeo.2020.110092
	Biomarker constraints on Mediterranean climate and ecosystem transitions during the Early-Middle Miocene
	Salocchi A.C.; Krawielicki J.; Eglinton T.I.; Fioroni C.; Fontana D.; Conti S.; Picotti V.
发表日期	2020
ISSN	0031-0182
英文摘要	Paleoenvironmental and paleoclimatic variations experienced by the Mediterranean region during the Miocene Burdigalian-Langhian interval have been investigated through analysis of biomarker signals (n-alkanes and glycerol dialkyl glycerol tetraethers, GDGTs) from slope mudstones of the northern Apennines (Marne di Vicchio Fm). Terrestrial signatures in marine sediments reflected by preserved long-chain n-alkanes with a identifiable odd-over-even carbon number predominance attest to the thermal immaturity of the sedimentary rock. Abundances of n-C27, n-C29 and n-C31 alkanes, coupled with the carbon isotopic signatures of the n-C31 homologue suggest that Mediterranean vegetation crossed a transition phase adapting to arid conditions that may favored a shift from woodland to wooded grassland during the Middle Miocene. This ecosystem evolution could have been favored by the passage from warm humid conditions to a warm drier climate, as indicated by GDGT-based TEX86 and BIT indexes. Strong similarities between these Mediterranean biomarker records and those from the Atlantic (DSDP Sites 94, 516, 608) imply a constant connection of the western Mediterranean to the Atlantic Ocean from ~19 Ma to ~14.5 Ma. © 2020 Elsevier B.V.
英文关键词	Apennines; Microbial biomarkers; Molecular proxies; Neogene; Paleoclimate; Paleovegetation; Plant wax biomarkers
语种	英语
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/150706
作者单位	Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Italy; Department of Earth Sciences (D-ERDW), ETH Zurich, Switzerland
推荐引用方式 GB/T 7714	Salocchi A.C.,Krawielicki J.,Eglinton T.I.,et al. Biomarker constraints on Mediterranean climate and ecosystem transitions during the Early-Middle Miocene[J],2020.
APA	Salocchi A.C..,Krawielicki J..,Eglinton T.I..,Fioroni C..,Fontana D..,...&Picotti V..(2020).Biomarker constraints on Mediterranean climate and ecosystem transitions during the Early-Middle Miocene.Palaeogeography, Palaeoclimatology, Palaeoecology.
MLA	Salocchi A.C.,et al."Biomarker constraints on Mediterranean climate and ecosystem transitions during the Early-Middle Miocene".Palaeogeography, Palaeoclimatology, Palaeoecology (2020).