Expansion/shrinkage history of the Paratethys Sea during the Eocene: New insights from eolian Red Clay records in the Altyn Mountains, northern China
Expansion/shrinkage history of the Paratethys Sea during the Eocene: New insights from eolian Red Clay records in the Altyn Mountains, northern China
复制标题
始新世帕拉提提斯海的扩张/收缩史：阿尔金山风成红粘土记录的新认识
DOI：
10.3389/feart.2022.1052627
复制
发表时间：
2022-11
期刊：
影响因子：
--
通讯作者：
Benhong Guo;J. Nie;Jianxing Li;W. Xiao;F. Pan
中科院分区：
文献类型：
--
作者：
Benhong Guo;J. Nie;Jianxing Li;W. Xiao;F. Pan
然而，与其他两种强迫相比，对Paratethys海的膨胀/收缩历史的了解要少得多。根据始新世红粘土赤铁矿含量重建了首个始新世Paratethys海详细的扩张/收缩历史，与塔里木盆地西南部低分辨率Paratethys海古水深记录具有较好的一致性。这些结果表明，Paratethys海在~ 51 ~ 40 Ma之间经历了三个阶段（收缩-膨胀-收缩）的演化，边界在~ 46.2 ~ 42 Ma。在此框架上，Paratethys海在膨胀阶段经历了4次快速收缩（显示400 kyr周期），在~ 44-42 Ma期间由偏心强迫调制。
Uplift of the Tibetan Plateau, expansion/shrinkage of the Paratethys Sea, and global climate are three major forcings for central-east Asian climatic and environmental variations during the Cenozoic. However, knowledge of expansion/shrinkage history of the Paratethys Sea is much less well known in comparison with the other two forcings. Here, we present a first multiple-parameter environmental magnetic and diffuse reflectance spectroscopy study of the Eocene eolian Red Clay deposits (∼51–40 Ma) in the Xorkol Basin of the northeastern Tibetan Plateau, which is near the easternmost maximum boundary of the Eocene Paratethys Sea. The first detailed Eocene expansion/shrinkage history of the Paratethys Sea was reconstructed based on the hematite content of the Eocene Red Clay, which shows remarkable consistency with the previous low-resolution Paratethys Sea paleowater depth record in the southwestern Tarim Basin. These results demonstrate that the Paratethys Sea experienced a three-stage (shrinkage-expansion-shrinkage) evolution between ∼51 and 40 Ma, with boundaries at ∼46.2 and 42 Ma. Superimposed on this framework, the Paratethys Sea experienced four times of rapid shrinkages at the expansion phase (shows 400-kyr cycles) during ∼44–42 Ma modulated by eccentricity forcings. These new results are of great significance to evaluate respective role of Tibetan uplift, global climate, and Paratethys Sea area variations in Asian climate and environmental change over the Eocene.