广西东攀二叠系-三叠系界线剖面基于岩石磁参数的米兰科维奇旋回特征和地层对比CYCLOSTRATIGRAPHY AND STRATIGRAPHIC CORRELATION BASED ON ROCK-MAGNETIC PARAMETERS ON THE PERMIAN-TRIASSIC BOUNDARY IN THE DONGPAN SECTION IN GUANGXI
陈建业,冯庆来,陈晶,朱宗敏
摘要(Abstract)：
二叠纪-三叠纪之交发生了地质历史上最大的生物集群绝灭。通过对广西东攀二叠系-三叠系界线剖面不同的磁学数据进行频谱分析,其结果均具一致的功率谱峰,对比煤山剖面的同位素年龄将厚度频率35.7∶15.6∶7.7cm/cycle换算为时间周期95∶41.6∶20.5kyr/cycle,分别与米兰科维奇旋回偏心率、斜度、岁差相当,从而将地层研究的精度提高到万年级,为生物绝灭和众多地质事件提供时间上的约束。不同的磁学参数分别受控于不同的天文周期,磁性矿物种类主要受偏心率旋回控制,同时也受斜度周期的影响,而岁差周期则是促使岩石携磁能力高频变化的原因。不同二叠系—三叠系剖面(集中在界线附近)的磁化率曲线具有一致特征,可作为界线点确定的辅助依据。
关键词(KeyWords)： 磁化率;米兰科维奇旋回;地层对比;二叠纪-三叠纪界线;东攀剖面;广西
基金项目(Foundation): 国家自然科学基金(No40232025);; 国家理科基础科学研究和教学人才培养基地资金资助
作者(Author): 陈建业,冯庆来,陈晶,朱宗敏
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