气候变化领域集成服务门户(CCPortal): Orbital forcing and abrupt events in a continental weathering proxy from central Europe (Most Basin; Czech Republic; 17.7–15.9 Ma) recorded beginning of the Miocene Climatic Optimum

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DOI	10.1016/j.palaeo.2018.10.034
	Orbital forcing and abrupt events in a continental weathering proxy from central Europe (Most Basin; Czech Republic; 17.7–15.9 Ma) recorded beginning of the Miocene Climatic Optimum
	Matys Grygar T.; Mach K.; Schnabl P.; Martinez M.; Zeeden C.
发表日期	2019
ISSN	0031-0182
起始页码	423
结束页码	440
卷号	514
英文摘要	We describe orbital forcing in siliciclastic lacustrine sediments, deposited in central Europe (ca. 50.5°N and 13.5°E, the Most Basin, the Czech Republic) between ~17.7 and ~15.9 Ma, i.e., before the Miocene climatic optimum (MCO) and in its early stage. Chemical element analysis combined with magneto- and cyclostratigraphy produced a consistent stratigraphy for the studied basin fill. The palaeoenvironmental record is mainly based on variations of the chemical weathering intensity in the lake catchment (normalised potassium concentration K/Al or K/Ti). The Most Basin sedimentary profile is specific by relatively high deposition rates (typically 20 cm/kyr, sampling density corresponded to temporal resolution of 1–2 kyr) and sensitivity to a regional continental climate. For age control, we used the ATNTS2012 for younger sediments and an alternative age of the onset of C5Dn chron and the end of C5Dr.1r short chron. In the earliest studied interval, the chemical weathering intensity in the catchment was controlled by precession, while between 17.5 and 17.15 Ma, short eccentricity was mainly driving chemical weathering intensity. After 17.05 Ma, i.e., just before the onset of the MCO, and in the period of persistent high eccentricity between 16.95 and 16.7 Ma, chemical weathering intensity reached its precession-controlled maxima. In the subsequent period of the persistent low eccentricity at 16.65 Ma, the orbital signal nearly vanished in the Most Basin. Abrupt but temporary environmental change occurred in the interval between 16.5 and 16.35 Ma (polarity chron C5Cn.2n), within two cycles of high eccentricity. Its trigger is uncertain but it might have been local or regional. The obtained composite record was compared with marine δ13C and δ18O data, showing certain global control of the Most Basin deposits. The Most Basin record thus shows climatic events of the pre-MCO and early MCO period in terrestrial settings of Central Europe, with changes at 17.05, 16.65, and 16.5 Ma, possibly representing triggers of the MCO. © 2018 Elsevier B.V.
英文关键词	Continental weathering; Eccentricity; Geochemistry; Miocene; Polarity time scale; Precession
语种	英语
scopus关键词	catchment; chemical weathering; cyclostratigraphy; eccentricity; environmental change; geochemistry; lacustrine deposit; magnetostratigraphy; Miocene; orbital forcing; paleoenvironment; precision; siliceous deposit; Czech Republic; Most Basin; Ustecky
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/151146
作者单位	Institute of Inorganic Chemistry, AS CR, v.v.i., Řež, 250 68, Czech Republic; North Bohemian Mines, j.s.c., 5. května 2013, Bílina, 418 01, Czech Republic; The Czech Academy of Sciences, Institute of Geology, Prague, Czech Republic; Univ Rennes, CNRS, Géosciences Rennes, UMR 6118, Rennes, 35000, France; IMCCE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Université Paris 06, Université Lille, Paris, 75014, France
推荐引用方式 GB/T 7714	Matys Grygar T.,Mach K.,Schnabl P.,等. Orbital forcing and abrupt events in a continental weathering proxy from central Europe (Most Basin; Czech Republic; 17.7–15.9 Ma) recorded beginning of the Miocene Climatic Optimum[J],2019,514.
APA	Matys Grygar T.,Mach K.,Schnabl P.,Martinez M.,&Zeeden C..(2019).Orbital forcing and abrupt events in a continental weathering proxy from central Europe (Most Basin; Czech Republic; 17.7–15.9 Ma) recorded beginning of the Miocene Climatic Optimum.Palaeogeography, Palaeoclimatology, Palaeoecology,514.
MLA	Matys Grygar T.,et al."Orbital forcing and abrupt events in a continental weathering proxy from central Europe (Most Basin; Czech Republic; 17.7–15.9 Ma) recorded beginning of the Miocene Climatic Optimum".Palaeogeography, Palaeoclimatology, Palaeoecology 514(2019).