globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.01.017
Scopus记录号: 2-s2.0-85012981881
论文题名:
The Calabrian in the Western Transcaucasian basin (Georgia): Paleomagnetic constraints from the Gurian regional stage
作者: Kirscher U.; Oms O.; Bruch A.A.; Shatilova I.; Chochishvili G.; Bachtadse V.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 160
起始页码: 96
结束页码: 107
语种: 英语
英文关键词: Calabrian ; Caucasus ; Gurian ; Magnetostratigraphy ; Paratethys
Scopus关键词: Lithology ; Sediments ; Tectonics ; Calabrian ; Caucasus ; Gurian ; Magnetostratigraphy ; Paratethys ; Oxic sediments ; Calabrian ; magnetostratigraphy ; Miocene ; oxic conditions ; paleoclimate ; paleomagnetism ; Paratethys ; piggyback basin ; Pliocene ; reconstruction ; sedimentation rate ; tectonic setting ; Africa ; Caucasus ; Georgia ; Georgia (republic) ; Rioni River ; United States
英文摘要: The precise Eurasian chronostratigraphy of the Neogene-Quaternary period is still hampered by the existence of numerous regional stages often lacking independent and absolute age constraints. Therefore, detailed paleoclimatic reconstructions of areas like the Caucasus are still poorly constrained and the influence of climate variability on faunal interchange between Africa and Eurasia in the late Neogene-Quaternary is still difficult to address. During the last decades, Quaternary sections from western Georgia have produced a wealth of paleoclimatic proxy data. Unfortunately, these sections do not have a robust age control. This is especially true for the Gurian stage which has been vaguely defined as being coeval with the lower Pleistocene on the basis of poorly documented bio- and magnetostratigraphic data. In order to constrain the age of the Gurian stage, a detailed magnetostratigraphic study has been carried out. All major sections with known Gurian sediments in the former Rioni bay (a marine restricted area to the southeast of the Major Caucasus) have been studied. Our results confirm for the first time the strict correlation between the Gurian succession and the Calabrian stage. In addition, our data provides further information on the tectonic setting of the Rioni bay during the Calabrian in this region: (1) in the north, Gurian sediments were unconformably deposited on older Meotian sediments in a piggy back basin, (2) in the south, Gurian sediments are conformably overlying Kujalnician (Plio-Pleistocene) strata, (3) magnetostratigraphic correlation among sections indicate drastic changes in sediment accumulation rates within the basin, (4) rock magnetic experiments reveal significant magnetomineralogical differences between Gurian and the underlying Miocene sediments likely documenting a transition related to changes in oxic conditions, supply of terrigenous material and sedimentation rate close to the Miocene-Pliocene boundary. These results provide a robust basis for further tectonic and paleoclimatic investigations of this region. © 2017 Elsevier Ltd
资助项目: We would like to thank the editorial work by Henning Bauch and the anonymous revision, which led to a considerable improvement of our manuscript. We particularly thank the Georgian National Museum for logistic and other support during the fieldwork. We thank Tanja Rutz and Maia Bukhsianidze for assistance in the field. This study was funded by a grant of the German Research Foundation (DFG - Deutsche Forschungsgemeinschaft) to VB (Ba1210/22-1) and supported by the Volkswagen Foundation and the Heidelberg Academy of Sciences to AB (85 820). This work is a contribution to NECLIME (Neogene Climate Evolution in Eurasia) and ROCEEH (The Role of Culture in Early Expansions of Humans). This is contribution 920 from the ARC Centre of Excellence for Core to Crust Fluid Systems (http://www.ccfs.mq.edu.au).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59295
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作者单位: Earth Dynamics Research Group, ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and The Institute for Geoscience Research (TIGeR), Department of Applied Geology, WASM, Curtin University, Perth, Australia; Department of Earth and Environmental Sciences, Geophysics, Ludwig-Maximilians University, Munich, Germany; Departament de Geologia, Facultat de Ciències, Universitat Autònoma de Barcelona, Campus Bellaterra, Spain; ROCEEH Recearch Centre, Senckenberg Museum and Research Institute, Frankfurt, Germany; Institute of Paleobiology, Georgian National Museum, Tbilisi, Georgia; Institut Català de Paleoecologia Humana i Evolució Social (IPHES), Campus Sescelades URV, Tarragona, Spain

Recommended Citation:
Kirscher U.,Oms O.,Bruch A.A.,et al. The Calabrian in the Western Transcaucasian basin (Georgia): Paleomagnetic constraints from the Gurian regional stage[J]. Quaternary Science Reviews,2017-01-01,160
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