何龙1,王云鹏1,陈多福2,王钦贤1,王成1
He Long1,Wang Yun-peng1,Chen Duo-fu2,Wang Qin-xian1,Wang Cheng1
摘要: 利用有机碳、硫以及主量元素和微量元素等地球化学方法,分析了重庆东南部南川县三泉剖面的上奥陶统五峰组黑色页岩、观音桥段泥灰岩、下志留统龙马溪组黑色页岩的沉积环境与有机质的富集关系。结果表明,五峰组中上段和龙马溪组下段为有机质富集层段,Ba、P显示晚奥陶世—早志留世四川盆地内具有较高的生产力水平;V/Cr、Ni/Co和S/C等指示五峰组沉积时为缺氧还原条件,冰期观音桥段为富氧—贫氧环境,龙马溪组为厌氧硫化环境;Mo/TOC表明五峰组页岩受局限盆地控制,观音桥段和龙马溪组为中等—弱滞留环境;Ce异常揭示了冰期前后古海平面的变化对海底氧化还原条件造成的影响;TOC与Ba、Ti/Al的弱相关性表明初级生产力水平与陆源碎屑对五峰组—龙马溪组黑色页岩有机质的富集影响较小;而与V/Cr、Ni/Co的正相关性则表明缺氧还原的沉积环境是影响五峰组—龙马溪组黑色页岩有机质富集的主要因素。
中图分类号:
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