A new magnetostratigraphic framework for late Neogene Hipparion Red Clay in the eastern Loess Plateau of China
A new magnetostratigraphic framework for late Neogene Hipparion Red Clay in the eastern Loess Plateau of China
复制标题
黄土高原东部新近纪晚期三趾红土磁性地层新格架
DOI：
10.1016/j.palaeo.2008.08.001
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发表时间：
2008-10
影响因子：
3
通讯作者：
Kaakinen, Anu
中科院分区：
文献类型：
--
作者：
Mo, Duowen;Zhang, Zhaoqun;Zhu, Yanming;Zhou, Liping;Fortelius, Mikael;Kaakinen, Anu
黄土高原红粘土中的哺乳动物化石，特别是三趾马动物群，对重建北方晚第三纪的古生态和古气候具有重要价值。缺乏一个精确的年代框架，这些化石地点阻碍了我们的理解，中国哺乳动物群的进化，他们与欧洲哺乳动物单位的相关性，以及古气候信息的检索。通过对山西保德地区区域地层的野外调查，选取了三个新近纪晚期沉积剖面（谭峪沟、杨家沟Ⅰ、杨家沟Ⅱ）进行了详细的研究。利用古地磁资料建立了保德地区晚第三纪层序的新的年代格架。研究结果表明，保德地区红粘土堆积至少开始于7.23Ma前。不断的沉淀，叠加在一起的叮铃铃阵。确定了静乐组出露时间最长、最完整的一次，其出露时间为2.72~ 5.34Ma。静乐组与下伏保德组之间的岩性差异在红粘土中形成了明显的边界，该边界与其他地方记录的中新世/上新世边界不一致。在杨家沟-Ⅱ剖面中发现了3个丰富的化石层，其年龄分别为6.43- 6.54Ma、6.83- 6.86Ma和7.15- 7.18Ma。利用三种不同的退磁技术，在黄土和典型红粘土沉积物之间的过渡单元中识别出Matuyama-Gauss地磁反转边界。锁定深度高达6.8米（相当于约65 ka）推断，但仍然无法解释。
Mammalian fossils, especially the Hipparion fauna, found in the Red Clay of the Loess Plateau, are of immense value for reconstructing late Neogene paleoecology and paleoclimatology in northern China. The lack of a precise chronological framework for these fossil sites has impeded our understanding of the evolution of the Chinese mammalian fauna, their correlation with European mammalian units, and the retrieval of paleoclimatic information. In this study, a field survey of regional stratigraphy in the Baode area of Shanxi was carried out and three profiles (Tanyugou, Yangjiagou-I and Yangjiagou-II) of Late Neogene deposits were selected for detailed investigation. A new chronological framework of the Late Neogene sequences in the Baode area is established by means of paleomagnetism. Our results show that the Red Clay accumulation in the Baode area began at least 7.23 Ma ago. Deposition continued to the superposed Jingle Formation. The most continuous and complete exposure of the Jingle Formation known to date was identified and dated to 2.72~5.34 Ma. A lithological distinction between the Jingle Formation and the underlying Baode Formation forms a clear boundary in the Red Clay that is not coincident with the Miocene/Pliocene boundary documented elsewhere. Three rich fossil layers are found in the Yangjiagou-II profile and dated to 6.43–6.54 Ma, 6.83–6.86 Ma and 7.15–7.18 Ma, respectively. With the application of three different demagnetization techniques, the Matuyama–Gauss geomagnetic reversal boundary was identified in a transitional unit between loess and typical Red Clay deposits. A lock-in depth of as large as 6.8 m (corresponding to ca. 65 ka) was inferred but remains unexplained.
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影响因子：
64.8
作者：
L. Zhou;F. Oldfield;A. Wintle;S. Robinson;J. T. Wang
通讯作者：
L. Zhou;F. Oldfield;A. Wintle;S. Robinson;J. T. Wang
DOI：
10.1002/cjg2.81
发表时间：
2000-09
期刊：
Chinese Journal of Geophysics
影响因子：
--
作者：
R. Zhu;B. Guo;Z. Ding;Zhengtang Guo;A. Kazansky;G. Matasova
通讯作者：
R. Zhu;B. Guo;Z. Ding;Zhengtang Guo;A. Kazansky;G. Matasova
DOI：
--
发表时间：
2002
期刊：
--
影响因子：
--
作者：
Zhaoqun Zhang;A. Gentry;A. Kaakinen;L. Liping;J. Lunkka;Z. Qiu;S. Sen;R. Scott;L. Werdelin-
通讯作者：
Zhaoqun Zhang;A. Gentry;A. Kaakinen;L. Liping;J. Lunkka;Z. Qiu;S. Sen;R. Scott;L. Werdelin-
DOI：
10.1016/s0031-0182(02)00382-6
发表时间：
2002-09
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
Jingtai Han;W. Fyfe;Z. Gu
通讯作者：
Jingtai Han;W. Fyfe;Z. Gu
DOI：
--
发表时间：
1985
期刊：
--
影响因子：
--
作者：
Dongsheng Liu
通讯作者：
Dongsheng Liu