[an error occurred while processing this directive] 高校地质学报 2019, 25(4) 598- DOI:     ISSN: 1006-7493 CN: 32-1440/P

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本文关键词相关文章
米兰科维奇旋回
小波分析
天文年代标尺
高频层序
上二叠统
盘县
本文作者相关文章
PubMed
基于米氏旋回的黔西盘县上二叠统煤系高频层序研究
宗毅,沈玉林,秦勇,金军,刘近帮,仝根成,郑俊,张一杰
摘要: 上二叠统记录了地质历史时期最大规模的生物灭绝事件和最深刻的环境变化。对上二叠统的层序地层格架进行精细
描绘,建立高分辨率的地层序列,是深入了解此次事件及其演化的基础和关键。基于钻测井、岩心观测及地球化学分析测
试结果等资料综合分析,并运用小波分析技术,对黔西盘县上二叠统煤系进行了米氏旋回的识别和划分,结果表明,研究
区上二叠统煤系记录了稳定的米兰科维奇旋回,天文轨道周期对其沉积过程具有明显影响,由长、短偏心率、地轴斜率和
岁差周期引起的地层旋回厚度分别为16.06~17.24 m、5.39~5.70 m、2.11~2.15 m、1.12~1.21 m,长偏心率周期对地层中沉积
旋回的控制和影响最强。对长、短偏心率周期进行滤波分析后,建立了上二叠统煤系“浮动”天文年代标尺,为约束同沉
积火山事件层(Tonstein) 的形成及其持续时限提供了年代学依据。以区域等时对比效果明显的长偏心率旋回为标尺,并结
合旋回沉积序列、旋回界面特征等,将上二叠统煤系划分为4个三级层序,并进一步划分为16个四级层序(对应于中期旋
回),建立了研究区高频层序地层格架。
关键词 米兰科维奇旋回   小波分析   天文年代标尺   高频层序   上二叠统   盘县  
High Frequency Cyclic Sequence Based on the Milankovitch Cycles in Upper Permian Coal Measures in Panxian, Western Guizhou Province
ZONGYi,SHEN Yulin,QIN Yong,JIN Jun4,LIU Jinbang,TONGGencheng
Abstract: The Upper Permian recorded the greatest mass extinction events and the most dramatic environmental changes in geological
history. Fine description of stratigraphic framework and the establishment of high-resolution stratigraphic sequence of the Upper
Permian have been the key and foundation to in-depth understanding of these events and evolutions. Based on comprehensive analyses
of well logging, core observation, and geochemical testing results, this study performs the sequence stratigraphic division of the Upper
Permian coal measures on Milankovitch cycles using wavelet analysis in Panxian, western Guizhou Province. Results show that
well-preserved Milankovitch cycles were contained in the measures. The sedimentary process of coal measures was obviously affected
by astronomical orbital period. The thickness of 16.06-17.24 m, 5.39-5.70 m, 2.11-2.15 m and 1.12-1.21 m were affected by long
eccentricity (405 ka), short eccentricity (123 ka), obliquity (44 ka) and precession (21 ka), respectively. Among the four controlling
factors, the long eccentricity had the strongest effect on the coal measures of Milankovitch cycles. A“floating”astronomical time scale
was established by filtering the long and short eccentricity cycles, which provided geo-chronological constraints on the formation and
duration of the synsedimentary volcanic event layers (known as Tonsteins). Finally, taking the long eccentricity cycles as isochronous
section and combined with the sedimentary succession and characteristics of cycle boundaries, the Upper Permian coal measures in the
study area can be divided into four third-order sequences and sixteen fourth-order sequences. These help to establish the regional
high-frequency cyclic sequence framework.
Keywords: Milankovitch Cycles   wavelet analysis   astronomical time scale   high-frequency cyclic sequence   the Upper Permian   Panxian  
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