沁水盆地左权地区山西组米氏旋回识别及其天文年代标尺  

Milankovitch Cycles Identification and Astronomical Time Scale of Shanxi Formation in Zuoquan Area,Qinshui Basin

作　　者：苟苏恒 吕佳阳 李柯良 刘亮亮 邵龙义[1,2] GOU Suheng;LYU Jiayang;LI Keliang;LIU Liangliang;SHAO Longyi(State Key Laboratory of Coal Resources and Safe Mining(China University of Mining and Technology),Beijing 100083;College of Geoscience and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083;State Key Laboratory of Coal and CBM Co-mining,Jincheng,Shanxi 048012;Yi’an-Lanyan Coal and CBM Co-mining Technology Co.,Ltd.,Jincheng,Shanxi 048012)

机构地区：[1]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083 [2]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [3]煤与煤层气共采国家重点实验室,山西晋城048012 [4]易安蓝焰煤与煤层气共采技术有限责任公司,山西晋城048012

出　　处：《中国煤炭地质》2024年第4期1-7,12,共8页Coal Geology of China

基　　金：煤炭资源与安全开采国家重点实验室开放基金(SKLCRSM22DC01);大学生创新训练项目(202102020);山西省科技计划揭榜招标资助项目(20201101004)。

摘　　要：依据地层序列的旋回信号进行地球轨道参数周期的识别,是确定深时时间尺度的有效方法之一。以沁水盆地左权地区山西组为例,使用时间序列分析法与相关系数法对钻孔剖面自然伽马测井曲线进行旋回性分析,并据此建立山西组年代地层标尺。使用频谱分析,在区内山西组识别出7.13 m、1.62~2.23 m的优势沉积旋回,分别对应405 kyr的长偏心率周期和91.9~126.4 kyr的短偏心率周期,经过天文检验,证实沁水盆地山西组受到天文周期驱动。通过高斯带通滤波,建立沁水盆地山西组“浮动”天文年代标尺,确定出9个405 kyr长偏心率旋回,据此获得山西组沉积时限为3.82 Myr。建立的天文年代标尺可为沁水盆地山西组古环境、古气候和各种地质事件的演化提供年代学依据。The identification of earth orbit parameter period based on stratigraphic cycle signal is one of the effective methods to determine deep time scale.Taking the Shanxi Formation in Zuoquan area of Qinshui Basin as an example,the time series analysis and correlation coefficient methods were uesd to analyze the cyclostratigraphy of the gamma logging curve,and the astronomical time scale of Shanxi Formation was established.Using spectral analysis,the dominant sedimentary cycles of 7.13 m and 1.62~2.23 m were identified in the Shanxi Formation,corresponding to the 405 kyr long eccentricity and the 91.9~126.4 kyr short eccentricity respectively.Through Astronomical testing,it is confirmed that the Shanxi Formation of Qinshui Basin is driven by astronomical periods.Based on the Gaussian band-pass wave filtering,the"floating"astronomical time scale of the Shanxi Formation was established,and nine 405 kyr long eccentricity cycles were identified,the calculated accumulation time of Shanxi Formation is 3.82 Myr.The establishment of astronomical time scale can provide chronology basis for evolution of paleoenvironment,paleoclimate and duration of various geological events of Shanxi Formation in Qinshui Basin.

关 键 词：山西组 旋回地层学 天文年代标尺 轨道参数周期 沁水盆地 

分 类 号：P539[天文地球—古生物学与地层学]