京西雾迷山组第4段强迫型海退过程中的层序旋回特征及其构造古地理意义
发布时间：2019-02-13 01:20
【摘要】：燕辽地区雾迷山组下、中部主体属海进阶段的层序旋回,以发育对称型相序组构为特征,但上部表现为强迫型海退过程,层序旋回特征未有精细的研究。为此,笔者等选择京西永定河庄户洼剖面的雾迷山组第4段开展系统的沉积微相、沉积相序和层序地层学、化学地层学研究,用以恢复沉积相和划分副层序类型,并通过碳、氧同位素组成和相关数据分析的方法验证古环境的演变过程。庄户洼剖面中共识别出九种岩相,不同岩相反映了特定的水深、地形和生物条件,其δ~(13)C值和δ~(18)O值也会有相应的体现。一般情况下,古温度T值增大,δ18 O值和古盐度Z值减小,反映海平面上升;反之则指示海平面下降。研究表明,强迫型海退过程中的层序旋回为不对称相序组构,从潮上带至潮下带其副层序结构由复杂趋于简单,微层序的主要叠加方式也由1∶4向1∶2演变。因此,雾迷山组第4段层序旋回的相序组构与典型的"雾迷山组旋回"差异巨大,这可能与华北古陆北缘中元古代的构造演化转折相关。
[Abstract]:Under the Wumishan formation in Yanliao area, the main body of the middle part belongs to the sequence cycle of the sea-advancing stage, characterized by the development of symmetrical facies fabric, but the upper part is characterized by a forced regression process, and the characteristics of the sequence cycle have not been studied in detail. For this reason, the authors selected the fourth member of Wumishan formation in Yongding River Zhuhuwa section of western Beijing to carry out systematic sedimentary microfacies, sedimentary facies sequence and sequence stratigraphy, chemical stratigraphy to restore sedimentary facies and divide sub-sequence types, and through carbon, The evolution of paleoenvironment was verified by oxygen isotopic composition and data analysis. Nine types of lithofacies were identified in Zhuanghuwa section. Different lithofacies reflect the specific water depth, topography and biological conditions, and their 未 ~ (13) C and 未 ~ (18) O values will also be reflected. In general, the T value of paleo temperature increases, the 未 18 O value and the paleosalinity Z value decrease, which reflects the rise of sea level, whereas it indicates that the sea level will fall. The study shows that the sequence cycles in the forced regression process are asymmetric sequence fabric, the secondary sequence structure of the subtidal zone from the upper tidal zone to the subtidal zone tends to be simple, and the main stacking mode of the microsequence evolves from 1:4 to 1:2. Therefore, the sequence fabric of the fourth member of the Wumishan formation differs greatly from the typical "Wumishan formation cycle", which may be related to the tectonic transition of the Middle Proterozoic in the northern margin of North China.
【作者单位】： 中国地质大学(北京)地球科学与资源学院;中国地质科学院;
【基金】：中国地质科学院基本科研业务费(编号:YWF201608和YWF201609) 国家自然科学基金青年基金项目(编号:41402004)资助的成果
【分类号】：P531;P542
[Abstract]:Under the Wumishan formation in Yanliao area, the main body of the middle part belongs to the sequence cycle of the sea-advancing stage, characterized by the development of symmetrical facies fabric, but the upper part is characterized by a forced regression process, and the characteristics of the sequence cycle have not been studied in detail. For this reason, the authors selected the fourth member of Wumishan formation in Yongding River Zhuhuwa section of western Beijing to carry out systematic sedimentary microfacies, sedimentary facies sequence and sequence stratigraphy, chemical stratigraphy to restore sedimentary facies and divide sub-sequence types, and through carbon, The evolution of paleoenvironment was verified by oxygen isotopic composition and data analysis. Nine types of lithofacies were identified in Zhuanghuwa section. Different lithofacies reflect the specific water depth, topography and biological conditions, and their 未 ~ (13) C and 未 ~ (18) O values will also be reflected. In general, the T value of paleo temperature increases, the 未 18 O value and the paleosalinity Z value decrease, which reflects the rise of sea level, whereas it indicates that the sea level will fall. The study shows that the sequence cycles in the forced regression process are asymmetric sequence fabric, the secondary sequence structure of the subtidal zone from the upper tidal zone to the subtidal zone tends to be simple, and the main stacking mode of the microsequence evolves from 1:4 to 1:2. Therefore, the sequence fabric of the fourth member of the Wumishan formation differs greatly from the typical "Wumishan formation cycle", which may be related to the tectonic transition of the Middle Proterozoic in the northern margin of North China.
【作者单位】： 中国地质大学(北京)地球科学与资源学院;中国地质科学院;
【基金】：中国地质科学院基本科研业务费(编号:YWF201608和YWF201609) 国家自然科学基金青年基金项目(编号:41402004)资助的成果
【分类号】：P531;P542
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