浑江末前寒武纪丝状藻类及其环境意义

本文初步探讨了吉林浑江晚前寒武纪丝状藻类与沉积环境的关系。这些丝状藻类产自晚前寒武纪不同层位,大多属蓝绿藻类。通过对丝状藻类整体面貌和个体丰度的分析,笔者将其划分为三类即:藻席型、孤立生存型和其间的过渡类型。根据对现代丝状藻类生态及环境的研究,采取比较古生物学的方法,具体讨论了浑江地区晚前寒武纪丝状藻类的指相意义。根据沉积学与事件地层记录分析的沉积环境模式与对丝状藻类环境分析的结果是一致的。

TERMINAL PRECAMBRIAN FILAMENTOUS ALGAE IN HUNJIANG,JILIN,AND THEIR ENVIRONMENTAL SIGNIFICANCE

This paper discusses preliminarily the relationship between Terminal Precam-brian filamentous algae and their sedimentary environment in Hunjiang, Jilin.These filamentous algae found in different beds mostly belong to blue algae.Based on a study of the whole appearance of the filamentous algae and the abun-dance of their individuals, three types of filamentous algae are distinguished:mat--algae, isolated algae and transitional algae respectively. According to a studyof the ecology of modern filamentous algae and their sedimentary environmentand tbe method of analogy, the authors discuss the sedimentary environmentmodel of the Terminal Precambrian filamentous algae in the Hunjiang area,which accords with the analytical result of the environment of filamentous algae.Therefore, filamentous algae become one of indicators of facies.