地球轨道参数振幅与深水环境白云石化强度波动*

张奎华; 张鹏飞; 苗卓伟; 张倩

doi:10.7605/gdlxb.2024.05.061

古地理学报 ›› 2025, Vol. 27 ›› Issue (1) : 141 -152. DOI: 10.7605/gdlxb.2024.05.061

白云岩专题

地球轨道参数振幅与深水环境白云石化强度波动^*

张奎华 ¹ ,
张鹏飞 ² ,
苗卓伟 ²^,³^,⁴^,⁵ ,
张倩 ²^,³

作者信息 +

Amplitudes of Earth's orbital parameters and fluctuations of deep-water dolomitization

Kuihua ZHANG ¹ ,
Pengfei ZHANG ² ,
Zhuowei MIAO ²^,³^,⁴^,⁵ ,
Qian ZHANG ²^,³

Author information +

文章历史 +

PDF (1977K)

摘要

显生宙的白云石化强度波动与地质历史时期重大地质事件存在高度关联性,且白云石化强度波动机制在镁、碳长期循环和气候长期变化等方面的研究中日益重要。本研究以渤海湾盆地中始新统沙三下亚段为例,针对高分辨率的X射线全岩衍射分析数据开展时间序列分析以及耦合关系分析,揭示出渤海湾盆地沙河街组深水白云石旋回中记录的斜率振幅调制周期。结合土耳其Van湖第四系白云石旋回和二叠纪与三叠纪之交白云石化事件,初步探讨了显生宙地层中不同时间尺度的深水白云石化强度波动趋势与天文旋回的耦合关系。基于沙三下亚段盐度演化特征分析,推测地球轨道参数的振幅调制作用可能通过气候、环境波动影响微生物生态压力以及流体温度与pH值波动强度,从而进一步调控显生宙轨道尺度的深水白云石化强度。本研究为“白云石问题”的探索提供了一个新颖的视角。

Abstract

Due to the evident correlation between fluctuations in dolomitization intensity in Phanerozoic geological strata and significant geological events throughout Earth's history,it is increasingly important to understand the mechanisms underlying these fluctuations in relation to long-term magnesium and carbon cycles in terrestrial and marine environments,atmospheric processes,and climate change over extended periods. In this study,time series analysis and coupling analysis are analyzed based on high-resolution X-ray diffraction data to reveal the slope amplitude modulation cycle recorded by the deep-water dolomite cycle of the Shahejie Formation in the Bohai Bay Basin. Combining the Quaternary dolomite cycle in Van Lake,Turkey,with the dolomitization events during the Permian-Triassic period,we discussed the coupling relationship between the fluctuations in deep-water dolomitization intensity over the Phanerozoic eon and the amplitude of various Earth orbital parameters across different time scales. Building on the analysis of the salinity evolution characteristics of the Sha 3 submember,it is proposed that the amplitude-modulation effect of Earth's orbital parameters may influence microbial ecological stress and the fluctuations in temperature and pH of fluids through changes in climate and environmental factors. This,in turn,plays a significant role in regulating orbital deep-water dolomitization intensity during the Phanerozoic eon. This study provides a novel perspective for the exploration of the “dolomite problem”.