气候变化领域集成服务门户(CCPortal): Oxygen and carbon isotopes and trace-element/Ca ratios in Late Quaternary ostracods Loxoconcha lepida and Palmoconcha agilis from the Black Sea: Paleoclimatic and paleoceanographic implications

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DOI	10.1016/j.palaeo.2019.05.049
	Oxygen and carbon isotopes and trace-element/Ca ratios in Late Quaternary ostracods Loxoconcha lepida and Palmoconcha agilis from the Black Sea: Paleoclimatic and paleoceanographic implications
	Ankindinova O.; Aksu A.E.; Hiscott R.N.
发表日期	2019
ISSN	0031-0182
卷号	533
英文摘要	Oxygen and carbon isotopes and trace-element/Ca ratios are presented for the valves of benthic ostracods Palmoconcha agilis and Loxoconcha lepida extracted from two composite sediment cores from the Black Sea shelf. The two cores together provide a complete latest Pleistocene–Holocene sedimentary record, with 16 radiocarbon-dated shells in core M02-45 and 9 in core M05-50. Results reveal environmental changes and evolution of water chemistry associated with the last reconnection of the Black Sea to the global ocean. The δ18O values in composite cores M02-45 and M05-50 exhibit ranges of ~8.0‰ and ~3.0‰, respectively; δ13C values show ranges of ~2.5‰ and ~2.0‰. There are three isotopic substages: (a) substage 1c (12.1–9.4 cal ka) represents conditions in the Neoeuxine Lake with relatively high δ13C and low δ18O, (b) substage 1b (9.4–6.3 cal ka) represents the transition from lacustrine to marine conditions with an increase in δ18O values as small amounts of Mediterranean water flowed into the Black Sea, and (c) substage 1a (6.3 cal ka to Present) represents the establishment of marine conditions like today with near-constant δ18O values and a trend of slowly increasing δ13C. Trace-element/Ca ratios show downcore trends consistent with the three isotopic substages. At ~6.3 cal ka, isotopic data and trace-element/Ca ratios exhibit a major shift, with changes in the Mg/Ca ratio suggesting an increase in water temperature from 12–14 °C to 17–19 °C. These mid-Holocene changes in ostracod-valve composition and environmental conditions coincide with the weakening of Black Sea outflow and the proliferation of marine organisms. © 2019 Elsevier B.V.
英文关键词	ICP-MS; Laser ablation; Neoeuxine Lake; Stable isotopes; Vital effect
语种	英语
scopus关键词	benthic fauna; biostratigraphy; calcium; carbon isotope; core analysis; inductively coupled plasma method; laser method; Mediterranean Water; ostracod; oxygen isotope; paleoceanography; paleoclimate; Quaternary; radiocarbon dating; sedimentary sequence; shell bed; stable isotope; trace element; Black Sea; Loxoconcha; Ostracoda
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/150832
作者单位	Department of Earth Sciences, Memorial University of Newfoundland, St. John's, NL A1B 3X5, Canada
推荐引用方式 GB/T 7714	Ankindinova O.,Aksu A.E.,Hiscott R.N.. Oxygen and carbon isotopes and trace-element/Ca ratios in Late Quaternary ostracods Loxoconcha lepida and Palmoconcha agilis from the Black Sea: Paleoclimatic and paleoceanographic implications[J],2019,533.
APA	Ankindinova O.,Aksu A.E.,&Hiscott R.N..(2019).Oxygen and carbon isotopes and trace-element/Ca ratios in Late Quaternary ostracods Loxoconcha lepida and Palmoconcha agilis from the Black Sea: Paleoclimatic and paleoceanographic implications.Palaeogeography, Palaeoclimatology, Palaeoecology,533.
MLA	Ankindinova O.,et al."Oxygen and carbon isotopes and trace-element/Ca ratios in Late Quaternary ostracods Loxoconcha lepida and Palmoconcha agilis from the Black Sea: Paleoclimatic and paleoceanographic implications".Palaeogeography, Palaeoclimatology, Palaeoecology 533(2019).