气候变化领域集成服务门户(CCPortal): Lacustrine stromatolites as multi-scale recorders of climate change: Insights from the Miocene Ebro Basin

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DOI	10.1016/j.palaeo.2019.05.001
	Lacustrine stromatolites as multi-scale recorders of climate change: Insights from the Miocene Ebro Basin
	Martin-Bello L.; Arenas C.; Andrews J.E.; Alonso-Zarza A.M.; Marca A.
发表日期	2019
ISSN	0031-0182
起始页码	312
结束页码	329
卷号	530
英文摘要	Sedimentological, δ13C and δ18O data from stromatolites in a lower and middle Miocene sequence from the Ebro Basin (N Spain) are used to assess the potential of ancient lacustrine stromatolite lamination as an archive of palaeoenvironmental and palaeoclimatic change. The isotopic evolution through the studied sequence supports a general trend toward less saline conditions with time. Stromatolites and muddy-grainy laminated limestones developed in lake water that underwent little renewal, compared with other carbonate facies. The palaeoclimatic value of the stable-isotope changes and concurrent textural variations in calcite stromatolite lamination is studied at different orders of cyclicity. Stromatolite lamination consists of simple laminae (dark dense, light dense and light porous) grouped into alternating composite light and dark laminae. δ13C and δ18O analyses in consecutive composite laminae (bulk sampling) yielded a cyclic pattern that mimics textural variations. Light laminae, with lower δ13C and δ18O values, reflect higher precipitation/evaporation ratio (P/E) and more influence of biogenic 12C. Dark laminae, with higher δ13C and δ18O values, reflect drier conditions, more complete atmospheric CO2 exchange with water and photosynthetic 12CO2 uptake. Textural features of laminae support these results: the dark laminae are related to higher calcite saturation in lake water during drier periods. Isotopic values from high-resolution sampling through a 2.1-cm thick stromatolite reveal palaeoclimate variations at different temporal scales. Isotopic variation in 3rd order cyclicity of alternating light/dark simple laminae is recording seasonal P/E variations. Light and dark composite laminae (2nd order cyclicity) correspond to pluriannual dominantly-humid or -dry conditions, respectively. A gradual succession from light to dark composite laminae forms the 1st order cycles driven by decreasing P/E through longer pluriannual periods, resulting in lake level lowering. The stromatolites are thus recording lake level changes of centennial to millennial scale. © 2019 Elsevier B.V.
英文关键词	Climate changes; Cyclicity; High resolution sampling; Lake level changes; Stable isotopes; Stromatolites
语种	英语
scopus关键词	calcite; climate change; climate variation; cyclicity; lake level; lake water; lamination; Miocene; paleoclimate; paleoenvironment; saturation; seasonal variation; stable isotope; stromatolite; Ebro Basin; Spain
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/150891
作者单位	Department of Earth Sciences, Institute for Research on Environmental Sciences of Aragón (IUCA) and Geotransfer group, University of Zaragoza, Zaragoza, 50009, Spain; School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, United Kingdom; Department of Petrology and Geochemistry, Faculty of Geology, Complutense University of Madrid, Madrid, 28040, Spain
推荐引用方式 GB/T 7714	Martin-Bello L.,Arenas C.,Andrews J.E.,et al. Lacustrine stromatolites as multi-scale recorders of climate change: Insights from the Miocene Ebro Basin[J],2019,530.
APA	Martin-Bello L.,Arenas C.,Andrews J.E.,Alonso-Zarza A.M.,&Marca A..(2019).Lacustrine stromatolites as multi-scale recorders of climate change: Insights from the Miocene Ebro Basin.Palaeogeography, Palaeoclimatology, Palaeoecology,530.
MLA	Martin-Bello L.,et al."Lacustrine stromatolites as multi-scale recorders of climate change: Insights from the Miocene Ebro Basin".Palaeogeography, Palaeoclimatology, Palaeoecology 530(2019).