Glendonite occurrences in the Tremadocian of Baltica: first Early Palaeozoic evidence of massive ikaite precipitation at temperate latitudes

doi:10.1038/s41598-019-43707-4

	Glendonite occurrences in the Tremadocian of Baltica: first Early Palaeozoic evidence of massive ikaite precipitation at temperate latitudes
	Popov, Leonid E.1; Alvaro, J. Javier 2; Holmer, Lars E.3,4,5; Bauert, Heikki 6,13; Pour, Mansoureh Ghobadi 1,3,7; Dronov, Andrei, V 8,9; Lehnert, Oliver 10,11,12; Hints, Olle 6; Mannik, Peep 6; Zhang, Zhifei 4,5
刊名	SCIENTIFIC REPORTS
	2019-05-10
卷号	9 页码:10
ISSN号	2045-2322
DOI	10.1038/s41598-019-43707-4
英文摘要	The Tremadocian (Early Ordovician) is currently considered a time span of greenhouse conditions with tropical water surface temperature estimates, interpolated from oxygen isotopes, approaching 40 degrees C. In the mid-latitude Baltoscandian Basin, conodonts displaying low delta O-18 values, which suggest high temperatures (>40 degrees C) in the water column, are in contrast with the discovery of contemporaneous glendonite clusters, a pseudomorph of ikaite (CaCO3 center dot 6H(2)O) traditionally considered as indicator of near-freezing bottom-water conditions. The massive precipitation of this temperature sensitive mineral is associated with transgressive conditions and high organic productivity. As a result, the lower Tremadocian sediments of Baltoscandia apparently contain both "greenhouse" pelagic signals and near-freezing substrate indicators. This paradox points to other primary controlling mechanisms for ikaite precipitation in kerogenous substrates, such as carbonate alkalinity, pH and Mg/Ca ratios, as recently constrained by laboratory experiments. Preservation of "hot" conodonts embedded in kerogenous shales rich in delta O-18-depleted glendonites suggests both the onset of sharp thermal stratification patterns in a semi-closed basin and the assumed influence of isotopically depleted freshwater yielded by fluvial systems.
资助项目	Spanish MINECO[CGL2017-87631-P] ; Estonian Research Council[PUT 378] ; Deutsche Forschungsgemeinschaft (DFG)[LE 867/8-1] ; Deutsche Forschungsgemeinschaft (DFG)[LE 867/8-2] ; Golestan University[6762] ; Swedish Research Council (VR)[2018-03390] ; Zhongjian Yang Scholarship from the Department of Geology, Northwest University, Xi'an ; National Natural Science Foundation of China[41425008] ; National Natural Science Foundation of China[41621003] ; National Natural Science Foundation of China[41720104002] ; 111 Centre[D17013] ; Russian Governmental Program of Competitive Growth of Kazan Federal University ; Program for Fundamental Research of the Presidium of Russian Academy of Sciences[19] ; Program for Fundamental Research of the Presidium of Russian Academy of Sciences[0135-2018-0040]
WOS关键词	OXYGEN ISOTOPIC COMPOSITION ; SPATIAL-DISTRIBUTION ; EARLY ORDOVICIAN ; BLACK SHALES ; WATER ; SEA ; PHOSPHATE ; CHEMOSTRATIGRAPHY ; PSEUDOMORPHS ; DELTA-O-18
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATURE PUBLISHING GROUP
WOS记录号	WOS:000467543700020
资助机构	Spanish MINECO ; Estonian Research Council ; Deutsche Forschungsgemeinschaft (DFG) ; Golestan University ; Swedish Research Council (VR) ; Zhongjian Yang Scholarship from the Department of Geology, Northwest University, Xi'an ; National Natural Science Foundation of China ; 111 Centre ; Russian Governmental Program of Competitive Growth of Kazan Federal University ; Program for Fundamental Research of the Presidium of Russian Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/22321]
专题	中国科学院南京地质古生物研究所
通讯作者	Popov, Leonid E.
作者单位	1.Natl Museum Wales, Dept Earth Sci, Cathays Pk, Cardiff CF10 3NP, S Glam, Wales 2.UCM, Inst Geociencias, CSIC, Dr Severo Ochoa 7, Madrid 28040, Spain 3.Dept Earth Sci Palaeobiol, SE-75236 Uppsala, Sweden 4.Northwest Univ, State Key Lab Continental Dynam, Shaanxi Key Lab Early Life & Environm, Xian 710069, Shaanxi, Peoples R China 5.Northwest Univ, Dept Geol, Xian 710069, Shaanxi, Peoples R China 6.Tallinn Univ Technol, Dept Geol, Ehitajate Tee 5, EE-19086 Tallinn, Estonia 7.Golestan Univ, Fac Sci, Dept Geol, Gorgan 4913815739, Golestan, Iran 8.Russian Acad Sci, Geol Inst, 7 Pyzhevskii Lane, Moscow 119017, Russia 9.Kazan Volga Reg Fed Univ, 18 Kremlevskaya St, Kazan 420008, Russia 10.FAU Erlangen Nurnberg, Lithosphere Dynam, GeoZentrum Nordbayern, Schlossgarten 5, D-91054 Erlangen, Germany
推荐引用方式 GB/T 7714	Popov, Leonid E.,Alvaro, J. Javier,Holmer, Lars E.,et al. Glendonite occurrences in the Tremadocian of Baltica: first Early Palaeozoic evidence of massive ikaite precipitation at temperate latitudes[J]. SCIENTIFIC REPORTS,2019,9:10.
APA	Popov, Leonid E..,Alvaro, J. Javier.,Holmer, Lars E..,Bauert, Heikki.,Pour, Mansoureh Ghobadi.,...&Zhang, Zhiliang.(2019).Glendonite occurrences in the Tremadocian of Baltica: first Early Palaeozoic evidence of massive ikaite precipitation at temperate latitudes.SCIENTIFIC REPORTS,9,10.
MLA	Popov, Leonid E.,et al."Glendonite occurrences in the Tremadocian of Baltica: first Early Palaeozoic evidence of massive ikaite precipitation at temperate latitudes".SCIENTIFIC REPORTS 9(2019):10.