Characteristics of the Milankovitch cycles and lake-level changes in the Ganchaigou Formation of the Kaitemirike area, western Qaidam.
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摘要:
目前，柴达木盆地米兰科维奇旋回研究普遍基于山前浅水沉积相地层进行讨论，而深水相地层中是否有记录米兰科维奇旋回特征有待探讨。本次研究通过对开2井上干柴沟组（N1）和下干柴沟组上段（E32）自然伽马测井曲线进行频谱分析和滤波分析，探讨了盆地西部开特米里克地区深湖相地层的米兰科维奇沉积旋回特征。结果显示，该地区上干柴沟组（N1）和下干柴沟组（E32）地层旋回周期与米兰科维奇地球轨道周期参数具有良好的对应性，说明天文轨道周期旋回对该地区地层沉积具有显著影响。在此基础上，结合Fischer图解及地层岩性特征，确定了干柴沟组上、下界线附近（约38.1~32.8 Ma）湖平面经历了一次相对长周期的升降变化。下干柴沟组上段处于湖平面上升阶段，主要受米氏旋回中的偏心率周期控制，气候相对温暖湿润，对应湖平面高位期。上干柴沟组处于湖平面下降阶段，主要受米氏旋回中的轴斜率周期控制，气候相对寒冷干旱，对应湖平面低位期。
Abstract:At present, the research on Milankovitch cycles in the Qaidam Basin is generally based on the discussion of the shallow-water sedimentary facies strata in the piedmont, but it remains to be explored whether the Milankovitch cycle characteristics are recorded in the deep-water facies strata. In this study, the Milankovitch sedimentary cycles of deep lacustrine strata in the Kaitemilik area in the west of the basin have been discussed through spectral analyses and filter analyses of natural gamma logging curves of the upper Ganchaigou Formation (N1)and the upper part of lower Ganchaigou Formation (E32) in Well K2. The results show that the stratigraphic cycles of the upper Ganchaigou Formation (N1) and the upper part of lower Ganchaigou Formation (E32) in this area have a good correlation with the earth's orbital cycle parameters of Milankovitch, indicating that the astronomical orbital cycle had a significant effect on the stratigraphic deposition in this area. On this basis, the Fischer plot and the sedimentary characteristics of the strata indicate that the lake level near the upper and lower boundary of Ganchaigou Formation (~38.1-32.8 Ma) experienced a relatively long period of fluctuation. The upper part of lower Ganchaigou Formation was formed in the rising stage of the lake level, which was mainly controlled by the eccentricity cycle in the Milankovitch cycle, and the climate was relatively warm and humid, corresponding to the high stage of lake level. The upper Ganchaigou Formation was deposited in the falling stage of the lake level, which was mainly controlled by the axial slope cycle in the Milankovitch cycle, and the climate was relatively cold and dry, corresponding to the low stage of lake level.
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Key words:
- Qaidam Basin /
- natural gamma /
- Milankovitch cycle /
- Fischer plot /
- lake level
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表 1 柴西开特米里克地区上干柴沟组和下干柴沟组上段自然伽马曲线频谱分析结果及比例关系
Table 1. Spectrum analysis results and proportional relationship of the natural gamma curve of the upper Ganchaigou Formation and the upper part of lower Ganchaigou Formation in the Kaitemirike area
地层 频率/m−1 厚度/m 厚度比值 理论比值 误差率/% 轨道周期/ka 上干柴沟组 0.1 10 1 1 0 偏心率100 0.1814 5.51 0.551 0.54 2.04 轴斜率长周期54 0.2407 4.15 0.415 0.41 1.31 轴斜率短周期41 0.4296 2.33 0.233 0.23 1.20 岁差长周期23 0.5296 1.88 0.189 0.19 −0.63 岁差短周期19 下干柴沟组上段 0.0967 10.35 1 1 0 偏心率100 0.1784 5.6 0.56 0.54 0.31 轴斜率长周期54 0.2268 4.41 0.44 0.41 3.96 轴斜率短周期41 0.4201 2.38 0.24 0.23 0.04 岁差长周期23 0.5056 1.98 0.2 0.19 0.62 岁差短周期19 
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