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Orbital control on cyclical organic matter accumulation in Early Silurian Longmaxi Formation shales
Geoscience Frontiers ( IF 8.5 ) Pub Date : 2019-06-29 , DOI: 10.1016/j.gsf.2019.06.005
Siding Jin , Hucheng Deng , Xing Zhu , Yan Liu , Sibing Liu , Meiyan Fu

High resolution (939 samples) total organic carbon content (TOC) analyses were conducted on the Shuanghe Section of ∼152.6 ​m in the Changning area, Sichuan Basin. The sampling section was divided into two units considering the distinct-different deposit environment and sediments accumulation rate. The lower part (Unit 1) and the peer part (Unit 2) with high resolution sample spacing (0.08–0.4 ​m) enables the identification of the precession cycle in two sedimentary sequences with distinct different sedimentary accumulation rate. MTM Power spectral analyses on untuned TOC series reveals significant peaks exceeding above the 95% confidence level and shows that both Unit 1 and Unit 2 have recorded Milankovitch cycles of 405 kyr long eccentricity, short eccentricity, obliquity and precession. The floating astronomical time scale (ATS) was constructed on the Shuanghe Section in the Early Silurian (∼439.673–444.681 ​Ma), and which was calibrated by 405 kyr long eccentricity cycles. The total duration of the Wufeng and Longmaxi shales is 5.01 Myr. The floating ATS used for estimating the duration of the graptolite zones and each stage in the study interval. Finally, we postulated two models that could verify the linkage between orbital cycle and organic accumulation. To make sure whether productivity or preservation is the main factor that under long eccentricity control, the phase correlation between the obtained filtered signal and the theoretical orbital solution should be made clear in the further research.



中文翻译:

志留纪龙马溪组早期页岩中循环有机质积累的轨道控制

在四川盆地长宁地区约152.6 m的双河剖面上进行了高分辨率(939个样品)总有机碳含量(TOC)分析。考虑到不同的沉积环境和沉积物堆积率,采样部分分为两个单元。下部(单元1)和对等部分(单元2)具有高分辨率的样本间距(0.08-0.4 m),可以识别两个沉积序列中旋进旋回周期,这两个沉积序列具有明显不同的沉积累积速率。在未调谐的TOC系列上进行的MTM功率谱分析显示,超过95%置信度以上的峰值明显,并且表明1号机组和2号机组记录的米兰科维奇周期为405 kyr长偏心距,短偏心距,倾角和进动。浮动天文时标(ATS)建立在志留纪早期(〜439.673–444.681 Ma)的双河剖面上,并通过405年的长偏心周期进行了校准。五峰页岩和龙马溪页岩的总持续时间为5.01马币。浮动ATS用于估计笔石区和研究间隔中每个阶段的持续时间。最后,我们提出了两个模型,可以验证轨道周期和有机质积累之间的联系。为了确定在长期偏心控制下生产率还是保持性是主要因素,在进一步研究中应弄清所获得的滤波信号与理论轨道解之间的相位相关性。并通过405 kyr的长偏心周期进行了校准。五峰页岩和龙马溪页岩的总持续时间为5.01马币。浮动ATS用于估计笔石区和研究间隔中每个阶段的持续时间。最后,我们提出了两个模型,可以验证轨道周期和有机质积累之间的联系。为了确定在长期偏心控制下生产率还是保持性是主要因素,在进一步研究中应弄清所获得的滤波信号与理论轨道解之间的相位相关性。并通过405 kyr的长偏心周期进行了校准。五峰页岩和龙马溪页岩的总持续时间为5.01马币。浮动ATS用于估计笔石区和研究间隔中每个阶段的持续时间。最后,我们提出了两个模型,可以验证轨道周期和有机质积累之间的联系。为了确定在长期偏心控制下生产率还是保持性是主要因素,在进一步研究中应弄清所获得的滤波信号与理论轨道解之间的相位相关性。我们提出了两个模型,可以验证轨道周期与有机质积累之间的联系。为了确定在长期偏心控制下生产率还是保持性是主要因素,在进一步研究中应弄清所获得的滤波信号与理论轨道解之间的相位相关性。我们提出了两个模型,可以验证轨道周期与有机质积累之间的联系。为了确定在长期偏心控制下生产率还是保持性是主要因素,在进一步研究中应弄清所获得的滤波信号与理论轨道解之间的相位相关性。

更新日期:2019-06-29
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