气候变化领域集成服务门户(CCPortal): Orbitally tuned age model for the late Pliocene-Pleistocene lacustrine succession of drill core SG-1 from the western Qaidam Basin (NE Tibetan Plateau)

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DOI	10.1093/gji/ggu372
	Orbitally tuned age model for the late Pliocene-Pleistocene lacustrine succession of drill core SG-1 from the western Qaidam Basin (NE Tibetan Plateau)
	Herb, Christian; Appel, Erwin; Voigt, Silke; Koutsodendris, Andreas; Pross, Joerg; Zhang, Weilin; Fang, Xiaomin
通讯作者	Herb, C (通讯作者)
发表日期	2015
ISSN	0956-540X
EISSN	1365-246X
起始页码	35
结束页码	51
卷号	200 期号:1
英文摘要	The availability of accurate and reliable age control is a crucial prerequisite for palaeoclimate studies, particularly when different archives are to be compared. Here we present a detailed depth-to-time transformation for the lacustrine sediments of a similar to 940-m-long drill core (SG-1) from the western Qaidam Basin (NE Tibetan Plateau). To establish a more precise age model than the one previously available, whichwas based solely on magnetostratigraphic dating using polarity boundaries as tie points, we applied time-series analysis on magnetic susceptibility (chi) variation. The chi data are available in high resolution and are considered to be closely linked to orbital forcing. Since the sediment accumulation rate (SAR) varies strongly throughout the succession of core SG-1, conventional cyclostratigraphy by bandpass filtering cannot be applied. We present two alternative age models based on spectral characteristics and orbital tuning. The first age model (TPspec) is based on the assumption that changes in SAR occurred when the frequency spectra revealed obviously different characteristics in the spectral pattern. For the second age model (SARA), SAR was adjusted every 2 m by comparing observed with expected orbital cycles in accordance with the age of magnetic reversals. This age model appears more robust and shows the most convincing spectral results in the frequency and wavelet power spectrum of chi. According to the SARA age model, SAR varies between 14 and 73 cm kyr(-1), and the bottom of SG-1 has an age of 2.69 Ma. Our results show that orbital tuning can be successfully applied for sequences with strongly variable SAR. The age model SARA can be used for a more detailed analysis of the existing multiproxy data set in terms of palaeoclimate evolution. The most prominent feature of chi spectra using the SARA age model is the identification of the middle Pleistocene transition.
关键词	CENOZOIC TECTONIC EVOLUTION CARBONATE ISOTOPE RECORDS EVAPORITE MINERALS M SEDIMENTS CHINA QUATERNARY INSOLATION MAGNETOSTRATIGRAPHY ARIDIFICATION VARIABILITY
英文关键词	Time-series analysis; Fourier analysis; Wavelet transform; Environmental magnetism; Magnetostratigraphy
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000350041600004
来源期刊	GEOPHYSICAL JOURNAL INTERNATIONAL
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258566
推荐引用方式 GB/T 7714	Herb, Christian,Appel, Erwin,Voigt, Silke,et al. Orbitally tuned age model for the late Pliocene-Pleistocene lacustrine succession of drill core SG-1 from the western Qaidam Basin (NE Tibetan Plateau)[J]. 中国科学院青藏高原研究所,2015,200(1).
APA	Herb, Christian.,Appel, Erwin.,Voigt, Silke.,Koutsodendris, Andreas.,Pross, Joerg.,...&Fang, Xiaomin.(2015).Orbitally tuned age model for the late Pliocene-Pleistocene lacustrine succession of drill core SG-1 from the western Qaidam Basin (NE Tibetan Plateau).GEOPHYSICAL JOURNAL INTERNATIONAL,200(1).
MLA	Herb, Christian,et al."Orbitally tuned age model for the late Pliocene-Pleistocene lacustrine succession of drill core SG-1 from the western Qaidam Basin (NE Tibetan Plateau)".GEOPHYSICAL JOURNAL INTERNATIONAL 200.1(2015).