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Magnetic stratigraphy constraints on the Matuyama-Brunhes boundary recorded in a loess section at the southern margin of Chinese Loess Plateau
Wu, Yi; Zhu, Zhaoyu; Qiu, Shifan; Han, Yulin; Cai, Jianxin; Rao, Zhiguo; Wu, Y (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China.
2016
Source PublicationGEOPHYSICAL JOURNAL INTERNATIONAL
Volume204Issue:2Pages:1072-1085
AbstractAlthough the Matuyama-Brunhes boundary (MBB) in the Chinese Loess Plateau (CLP) is very important in reliably correlating Quaternary loess with other sediments in the world, particularly with marine and polar ice cores, its exact stratigraphic position remains controversial. Previous investigations usually placed the MBB between paleosol unit S8 and loess unit L8 in various locations. To better understand the spatial differences in the MBB position, a high-resolution paleomagnetic study was conducted in a loess section of the Lantian Basin at the southern margin of the CLP. The results show that the MBB is situated in the middle of the relatively weak paleosol unit S7, consistent with a recent report on the MBB based on a Be-10 study from the Xifeng and Luochuan loess sections of the central CLP. However, the regional anomalously low magnetic susceptibility in paleosols S7 and S8 indicates that it is more reliable to determine the paleoclimate boundaries between loess and paleosol horizons of this segment with median grain size. Then, the MBB in the Yushan section can be correlated with the bottom of paleosol S7, corresponding to the older part of interglacial marine isotope stage 19. This result temporally reconciles the striking discrepancy of the position of the MBB recorded in between loess and other typical sedimentary sequences, and further confirms that the stratigraphic position of the MBB could spatially vary to a certain extent due to regional sedimentary or paleoclimatic conditions in the marginal areas of the CLP. In the Yushan section, the high-frequency variations of paleomagnetic directions during a long period of similar to 31 ka before the MBB, however, could not be attributed to a genuine response to the true geomagnetic behaviour. Moreover, the climate offset defined by the magnetic susceptibility and median grain size of the section can be preliminarily attributed to the regional geology and paleoenvironment background. A multiproxy-based stratigraphic division is considered very necessary when paleomagnetic and climatic boundaries are defined exactly in a specific area of the southern CLP.
Department[Wu, Yi; Han, Yulin; Cai, Jianxin] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Wu, Yi; Zhu, Zhaoyu] Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China; [Wu, Yi; Zhu, Zhaoyu] Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou 510640, Guangdong, Peoples R China; [Qiu, Shifan] Gannan Normal Univ, Sch Geog & Planning, Ganzhou 341000, Peoples R China; [Rao, Zhiguo] Lanzhou Univ, Minist Educ, Key Lab Western Chinas Environm Syst, Lanzhou 730000, Peoples R China ; 边缘海地质
KeywordMagnetic Fabrics And Anisotropy Magnetostratigraphy Reversals: Process Timescale Magnetostratigraphy
Subject AreaGeochemistry & Geophysics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15598
Collection中科院边缘海地质重点实验室
Corresponding AuthorWu, Y (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China.
Recommended Citation
GB/T 7714
Wu, Yi,Zhu, Zhaoyu,Qiu, Shifan,et al. Magnetic stratigraphy constraints on the Matuyama-Brunhes boundary recorded in a loess section at the southern margin of Chinese Loess Plateau[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2016,204(2):1072-1085.
APA Wu, Yi.,Zhu, Zhaoyu.,Qiu, Shifan.,Han, Yulin.,Cai, Jianxin.,...&Wu, Y .(2016).Magnetic stratigraphy constraints on the Matuyama-Brunhes boundary recorded in a loess section at the southern margin of Chinese Loess Plateau.GEOPHYSICAL JOURNAL INTERNATIONAL,204(2),1072-1085.
MLA Wu, Yi,et al."Magnetic stratigraphy constraints on the Matuyama-Brunhes boundary recorded in a loess section at the southern margin of Chinese Loess Plateau".GEOPHYSICAL JOURNAL INTERNATIONAL 204.2(2016):1072-1085.
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