扬子板块伊迪卡拉(震旦)纪多细胞生物的发展与烃源岩的形成

生物的生产量以及被保存的沉积有机质是烃源岩形成的重要条件。多细胞生物出现并广泛地生活于扬子地区伊迪卡拉纪陡山沱期晚期的浅海中,生物之间相互依赖和共存的多层次化和复杂化生态系统的建立,使陡山沱期成为扬子地区生命演化和发展重要时期。陡山沱期的黑色泥(页)岩在沉积时为富含水份的粥性沉积物,同时当时海洋中的氧化-还原界面较浅,生物遗体可迅速地被沉积物所覆盖而形成烃源岩。伊迪卡拉纪陡山沱期是化学、气候和环境变化的剧烈时期,也是扬子地区生命演化、有机质生产力发展和烃源岩形成的一个重要时期。

Development of the Ediacaran(Sinian) multicellular organisms and formation of the source rocks in the Yangtze area

The productivity of organisms and abundances of preserved organic matter are believed to be important conditions for the formation of source rocks. The muhicellular organisms appeared in substantial amounts in the Yangtze shallow sea during the Doushantuoan （Ediacaran）. The black mudstones （shales） were once deposited as the water-rich gruel sediments during the Doushantuoan. At that time, the oxidation-reduction interfaces were relatively shallower. The organic remains could be rapidly covered by the gruel sediments so as to form the source rocks. The Doushantuoan （Ediacaran） went through sharp changes in chemical, climatic and environmental aspects, and thus may be a key period for the life evolution, development of organic productivity and formation of the source rocks in the Yangtze area.