Astrochronology of a middle Eocene lacustrine sequence and sedimentary noise modeling of lake-level changes in Dongying Depression, Bohai Bay Basin
Astrochronology of a middle Eocene lacustrine sequence and sedimentary noise modeling of lake-level changes in Dongying Depression, Bohai Bay Basin
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渤海湾盆地东营凹陷中始新世湖泊层序的天文年代学及湖面变化的沉积噪声模拟
DOI：
10.1016/j.palaeo.2021.110740
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发表时间：
2021-11
期刊：
影响因子：
--
通讯作者：
Liu Sibing
中科院分区：
文献类型：
--
作者：
Jin Siding;Liu Sibing
渤海湾盆地始新统沉积序列的形成与气候的天文强迫变化有关。渤海湾盆地古近系的多个剖面进行了旋回地层学评价，并建立了多个天文时标。然而，年龄模型的校准和构建的ATS未能达成一致，其中许多依赖于完全不同的轨道解释在同一个部分/钻孔。本文建立了渤海湾盆地中始新统沙河街组沙三下段（Es3m-l）和沙四上段（Es4u）湖相地层的ATS。利用高分辨率自然伽马资料对范冶1井沙三段和沙四段进行了旋回地层学分析。筛选出与La 2004溶液短偏心率（~100-kyr）直接相关的Es3m-l~1111 m旋回和Es4u~926 m旋回。本研究以2020年地质时标中的C18r/C19n、C19n/C19r和C19r/C20n地磁极性年龄为年龄标志进行调谐。该年代学提供了Es3m-l段和Es4u段39.268 ± 0.050 Ma~43.621 ± 0.050 Ma的天文时标。对同一井段的范叶1井进行了天文年代学研究。然而，在本文中建立的ATS使用相关系数（COCO）分析和平均光谱失配（ASM）的方法来提供定量测量拟合观测到的沉积旋回天文周期，并给出了一个合理的沉积速率范围。在这项研究中，沉积噪声模型被应用于检测高分辨率的湖泊水位变化控制的轨道强迫。沉积噪声模型产生的湖平面变化得到了先前层序地层解释的支持。GR序列的演化相关系数分析表明，湖平面的变化对沉积作用有一定的影响。此外，从ATS和薄片观察，湖相页岩中的碳酸盐-粘土纹层是每年生成的。季节性碳酸盐-粘土层状泥页岩地层受季风轨道尺度变化的控制，在深水环境条件下，总是以较高的偏心率幅度发育。最后，在湖泊记录中，~40.500~40.050 Ma的湖平面上升是对中始新世气候适宜（MECO）事件的响应。
It has been demonstrated that the sedimentary deposits of Eocene succession in Bohai Bay Basin in China responded to astronomically forced climate changes. Several sections have been evaluated for cyclostratigraphy and many astronomical time scales (ATSs) have been constructed in Paleogene Bohai Bay Basin. However, the calibrations of age model and the constructed ATSs failed to reach an agreement and many of them relied on totally different orbital interpretations within the same section/borehole. In this work, we generated a new ATS for the middle Eocene lacustrine strata of middle to lower Member 3 (Es3m-l) and upper Member 4 (Es4u) of Shahejie Formation in Bohai Bay Basin. In this research, high resolution natural gamma-ray (GR) data were used for the cyclostratigraphy analysis of Es3m-l and Es4u Members of Well Fanye-1. We filtered ~11.11 m cycles of t Es3m-l and ~9.26 m cycles of Es4u which were directly correlated to the short eccentricity cycles (~100-kyr) of La2004 solution. The geomagnetic polarity ages of C18r/C19n, C19n/C19r and C19r/C20n in Geological Time Scale 2020 were adopted as age markers for the tuning in this study. This astrochronology provided astronomical time scale (ATS) in the range of 39.268 ± 0.050 Ma to 43.621 ± 0.050 Ma in Es3m-l and Es4u Member. The astrochronology of Well Fanye-1 of the same interval had been studied before. However, the ATS built in this paper used correlation coefficient (COCO) analysis and average spectral misfit (ASM) approach to provide quantitative measurement for fitting the observed sedimentary cycles to astronomical periods and given a range of plausible sedimentation rate. In this research, a sedimentary noise model was applied for the detection of high-resolution lake-level variations controlled by orbital forcing. The lake-level variations generated from the sedimentary noise model were supported by previous sequence stratigraphic interpretations. Variable sedimentation could be affected by lake-level changes which have been demonstrated by the evolutionary correlation coefficient analysis of GR series. In addition, from the ATS and thin section observations, it was concluded that carbonate-clay laminae in lacustrine shale were generated annually. Seasonal carbonate-clay laminated shale formations are controlled by orbital scale variability of monsoon and are always developed in a relatively high eccentricity amplitude under deep water environment conditions. Finally, the lake-level rise at ~40.500 Ma to ~40.050 Ma was demonstrated to be the response to Middle Eocene Climate Optimal (MECO) event in lacustrine records.
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DOI：
10.1007/s11430-013-4753-8
发表时间：
2014-04
期刊：
Science China Earth Sciences
影响因子：
--
作者：
Liao Wei;Song Guoqi;Wang Xuejun;Xu Xingyou
通讯作者：
Xu Xingyou
影响因子：
2.9
作者：
S. Meyers;B. Sageman
通讯作者：
S. Meyers;B. Sageman
DOI：
--
发表时间：
2007
期刊：
Journal of stratigraphy
影响因子：
--
作者：
Yao Yi-min
通讯作者：
Yao Yi-min
影响因子：
5.3
作者：
M. Machlus;J. Ramezani;S. Bowring;S. Hemming;K. Tsukui;W. Clyde
通讯作者：
M. Machlus;J. Ramezani;S. Bowring;S. Hemming;K. Tsukui;W. Clyde
湖相层状细粒岩岩石学特征、成因模式及其页岩油勘探意义——以三塘湖盆地马朗凹陷二叠系芦草沟组为例
影响因子：
7.5
作者：
Liu Bo;Lu Yanfang;Meng Yuanlin;Li Xinning;Guo Xiaobo;Ma Qiang;Zhao Wanchun
通讯作者：
Zhao Wanchun