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北京永定河谷庄户洼剖面中新元古界雾迷山组产出大量叠层石。本文对其形态进行分析测量,获得叠层石优势生长方向的雷达图,结合雾迷山组时期古板块方位、波痕构造所指示古水流方向及当时的构造应力方向等信息进行分析,对叠层石形态生长控制因素进行综合探讨。分析表明,因雾迷山组形成时期华北板块位于赤道附近,永定河谷庄户洼剖面雾迷山组叠层石形态不受阳光控制,控制其形态的主要因素是古水流。另外,构造应力活跃所引起的古地震频发导致了软沉积物向深海滑塌也影响了叠层石的生长形态,硅质填充物在后期破坏了叠层石的形态。对叠层石形态生长控制因素进行分析探讨,可帮助理解叠层石形态生长机理和古环境,具有重要的地球生态学意义。
Beijing Yongding Valley Chuang-Zhu depression profile in the Neoproterozoic Wumishan Formation a large number of laminated stone. In this paper, the radar pattern of the dominant growth direction of the stratum is obtained through the analysis and measurement of its morphology. Based on the analysis of the orientation of paleo-water flow and the direction of tectonic stress at the time of the Wumishan Formation, Stalactite morphological growth control factors comprehensively discussed. The analysis shows that because of the formation of the Wumishan Formation, the North China plate is located near the equator, the strata of the Wumishan Formation in the Zhuangdongwa profile of the Yongding River valley are not controlled by sunlight, and the main factor controlling its morphology is the paleocurrents. In addition, the frequent occurrence of the ancient earthquakes caused by the tectonic stress led to the slump of soft sediments to the deep sea and affected the growth pattern of the stratum. The siliceous filling destroyed the shape of the stratum in the later period. It is of great significance for the earth ecology to analyze and discuss the controlling factors for the growth of stratum in order to understand the growth mechanism of stratum and the paleoenvironment.