气候变化领域集成服务门户(CCPortal): Paleoenvironmental change in a precession-paced succession across the onset of the Messinian salinity crisis: Insight from element geochemistry and molecular fossils

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DOI	10.1016/j.palaeo.2019.01.009
	Paleoenvironmental change in a precession-paced succession across the onset of the Messinian salinity crisis: Insight from element geochemistry and molecular fossils
	Natalicchio M.; Dela Pierre F.; Birgel D.; Brumsack H.; Carnevale G.; Gennari R.; Gier S.; Lozar F.; Pellegrino L.; Sabino M.; Schnetger B.; Peckmann J.
发表日期	2019
ISSN	0031-0182
起始页码	45
结束页码	61
卷号	518
英文摘要	In marginal Mediterranean sub-basins, the early phase of the Messinian salinity crisis (MSC) is recorded by cyclic successions of gypsum and shales, which in deeper parts of the sub-basins make lateral transition into organic-rich shales, marls, and carbonates. The cyclic stacking pattern of the gypsum-bearing sequences is assumed to reflect periodic paleoenvironmental change induced by precession-driven climate perturbations, with the assumption that shales reflect humid climate (precession minima) while gypsum reflects arid conditions (precession maxima). However, this correlation has not been verified to date, mostly because of the scarcity of microfossils, the most commonly used tools for the reconstruction of precession-driven paleoenvironmental change. Such change can, instead, be reconstructed through the study of the deeper water counterparts of gypsum (marly and carbonate layers) with geochemical indicators (major and trace elements, molecular fossils), which provide insight on climate and aquatic productivity. We used this approach to study a section from the Piedmont Basin (NW Italy) where the onset of the MSC is archived in a sequence of organic-rich sediments. This sequence displays distinct lithological cyclicity, evidenced by the repetition of couplets of organic-rich shales and marls, either bioturbated (in the pre-MSC part of the section) or laminated (during the MSC). The influence of orbitally-driven (precession) climate oscillations is demonstrated by fluctuations of Ti/Al, Si/Al, Mg/Al, K/Al, Zr/Al, and Ba/Al ratios that are in phase with lithological cyclicity. These fluctuations are interpreted to reflect alternation of humid (shales, deposited during precession minima) and arid (bioturbated and laminated marls, deposited during precession maxima) phases, dominated by fluvial and aeolian transport of detrital material, respectively. The cyclicity of the element ratios is mirrored by changes in organic carbon content and molecular fossil inventory. In particular, the distribution of long-chain n-alkanes and their degree of preservation reveal that humid phases at times of precession minima were typified by the maximum input of degraded terrestrial organic matter driven by enhanced riverine runoff, which promoted water column stratification. Coeval increase in Ba content, a common paleoproductivity proxy, agrees with enhanced nutrient supply during humid periods, promoting phases of eutrophication in the basin. Lithological and geochemical changes are observed in MSC sediments deposited at times of precession maxima, evidenced by the replacement of pre-MSC bioturbated marls by laminated marls rich in filamentous fossils corresponding to the remains of probable colorless sulfide-oxidizing bacteria. Such changes reflect an intensification of water column stratification after the onset of the MSC, possibly related to the combined effect of persistent freshwater inflow and basin isolation, preluding the advent of gypsum precipitation. © 2019 Elsevier B.V.
英文关键词	Fluvial and aeolian transport; Lithological cyclicity; Major and trace elements; Terrestrial organic matter; Water column stratification
语种	英语
scopus关键词	eolian deposit; fluvial deposit; fossil record; geochemical survey; Messinian; microfossil; molecular analysis; paleoenvironment; precession; reconstruction; salinity; soil organic matter; trace element; water column; Italy; Mediterranean Sea; Piedmont Basin
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/151070
作者单位	Dipartimento di Scienze della Terra, Università degli Studi di Torino, Torino, Italy; Institut für Geologie, Centrum für Erdsystemforschung und Nachhaltigkeit, Universität Hamburg, Hamburg, Germany; Institut für Chemie und Biologie des Meeres, Universität Oldenburg, Oldenburg, Germany; Department für Geodynamik und Sedimentologie, Universität Wien, Wien, Austria
推荐引用方式 GB/T 7714	Natalicchio M.,Dela Pierre F.,Birgel D.,et al. Paleoenvironmental change in a precession-paced succession across the onset of the Messinian salinity crisis: Insight from element geochemistry and molecular fossils[J],2019,518.
APA	Natalicchio M..,Dela Pierre F..,Birgel D..,Brumsack H..,Carnevale G..,...&Peckmann J..(2019).Paleoenvironmental change in a precession-paced succession across the onset of the Messinian salinity crisis: Insight from element geochemistry and molecular fossils.Palaeogeography, Palaeoclimatology, Palaeoecology,518.
MLA	Natalicchio M.,et al."Paleoenvironmental change in a precession-paced succession across the onset of the Messinian salinity crisis: Insight from element geochemistry and molecular fossils".Palaeogeography, Palaeoclimatology, Palaeoecology 518(2019).