胶莱盆地K/Pg界线下陆相红层的旋回地层学分析  

Cyclostratigraphical Analysis of Continental Red Beds Below K/Pg Boundary in the Jiaolai Basin

作　　者：杨雨 付文钊[1] 余继峰 宁振国 崔建军[4,5] 李卿 禚喜准[1] 陈建平 YANG Yu;FU WenZhao;YU JiFeng;NING ZhenGuo;CUI JianJun;LI Qing;ZHUO XiZhun;CHEN JianPing(College of Mining,Liaoning Technical University,Fuxin,Liaoning 123000,China;College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;Shandong Institute of Geological Survey,Jinan 250014,China;Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Natural Resources,Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;Bureau of Geophysical Prospecting INC.,China National Petroleum Corporation,Zhuozhou,Hebei 072751,China)

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000 [2]山东科技大学地球科学与工程学院,山东青岛266590 [3]山东省地质调查研究院,济南250014 [4]中国地质科学院地质力学研究所,北京100081 [5]中国地质科学院地质力学研究所,自然资源部古地磁与古构造重建重点实验室,北京100081 [6]中油集团东方地球物理公司研究院,河北涿州072751

出　　处：《沉积学报》2021年第4期942-952,共11页Acta Sedimentologica Sinica

基　　金：辽宁省教育厅青年项目(LJ2017QL027);国家自然科学基金(41472092)。

摘　　要：陆相红层因为其含古生物化石稀少给高精度生物、年代地层的对比带来了较大的困难。旋回地层学可以将地层与地时结合起来,解决地层沉积的时限问题。基于前人在对胶莱盆地K/Pg界线识别的基础上,主要利用了一维连续小波变换尺度分析法与频谱分析法对胶莱盆地胶州组K/Pg界线之下、晚白垩世红土崖组玄武岩夹层之上的陆相红层进行旋回地层分析,认为胶莱盆地晚白垩世的陆相红层中保存有米兰科维奇旋回,岁差、斜率和偏心率各个周期在不同的层段响应程度略有不同。根据旋回识别结果及K/Pg界线建立了“浮动天文年代标尺”,推测在66~67.77 Ma期间,胶莱盆地陆相红层的平均沉积速率约为5.15 cm/kyr,胶州地区[(67.77~73)±0.3]Ma期间为玄武岩岩浆冷凝固结形成玄武岩进而遭受风化剥蚀及构造沉降的时期,红土崖组与胶州组的时间界线约为67.28 Ma,红土崖组玄武岩夹层的年龄应早于67.77 Ma。It is difficult to compare large-scale continental red beds with marine and chronostratigraphic strata because of the scarcity of paleontological fossils.Cyclostratigraphical methods were used to combine strata with time and determine the time constraints of red bed deposition.Based on the identification of the K/Pg boundary in the Jiaolai Basin reported in previous studies,gamma ray(GR)logging data was analyzed,using mainly wavelet transform scale analysis and spectrum analysis,to study the continental red beds below the K/Pg boundary and above the basalt interbeds of the Upper Cretaceous Hongtuya Formation.It is concluded that the continental red beds developed in the Upper Cretaceous strata of the Jiaolai Basin,which contain obvious Milankovitch cycles.Cyclic precession,declination and eccentricity are preserved with different levels of clarity in segments at different depths.It is inferred from an estimated"floating astronomical timescale"based on the analyzed cyclostratigraphy that the average sedimentation rate of the continental red beds in the Jiaolai Basin was about 5.15 cm/kyr from 67.77 to 66 Ma.After the basalt magma condensed and consolidated to become rock,it experienced tectonic subsidence,weathering and denudation between 73±0.3 and 67.77 Ma.The time boundary between the Hongtuya and Jiaozhou Formations is at about 67.28 Ma,and the basalt interbeds were formed before 67.77 Ma.

关 键 词：陆相红层 旋回地层学 小波变换尺度分析 频谱分析 

分 类 号：P618.13[天文地球—矿床学]