| 显生宙海水成分、碳酸盐沉积和生物演化系统研究进展 |
| |
| 引用本文： | 颜佳新,伍明.显生宙海水成分、碳酸盐沉积和生物演化系统研究进展[J].地质科技情报,2006,25(3):1-7. |
| |
| 作者姓名： | 颜佳新 伍明 |
| |
| 作者单位： | 1. 中国地质大学地球科学学院,武汉,430074
2. 中南民族大学分析化学国家民委重点实验室,武汉,430074 |
| |
| 基金项目： | 中国科学院资助项目，中国地质大学(武汉)校科研和校改项目 |
| |
| 摘 要： | 简述了显生宙海水成分演化的特征、识别标志和成因解释模型以及存在的问题和今后研究的方向.不同时期海水的成分的差异,特别是海水的x(Mg)/x(Ca)值,导致了文石海、方解石海时期的碳酸盐沉积和早期成岩作用均存在差异,甚至影响了盆地深部成岩流体的特征.显生宙海生生物的演替和盛衰,特别是简单生物(如钙藻和海绵)和高产率生物(如造礁生物和碳酸盐沉积物主要生产者),明显体现了海水的x(Mg)/x(Ca)值周期性变化对海生生物的影响.这种影响也同样体现在古生代末期的生物大绝灭及随后的生物复苏样式上,在生物更替事件研究中应引起重视.因此,生物与环境的协同演化研究必须从地球系统科学的角度展开.
|
| 关 键 词： | 海水成分 碳酸盐沉积 生物演化 显生宙 |
| 文章编号： | 1000-7849(2006)03-0001-07 |
| 收稿时间： | 2005-06-15 |
| 修稿时间： | 2005年6月15日 |
Synchronized Osciliations in Phanerozoic Chemical Composition of Seawater, Carbonate Sedimentation and Biotic Evolution:Progresses and Prospects |
| |
| YAN Jia-xin,WU Ming.Synchronized Osciliations in Phanerozoic Chemical Composition of Seawater, Carbonate Sedimentation and Biotic Evolution:Progresses and Prospects[J].Geological Science and Technology Information,2006,25(3):1-7. |
| |
| Authors: | YAN Jia-xin WU Ming |
| |
| Institution: | 1. Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China ; 2. Key Lab for Analytical Chemistry of the State Ethnic Affairs Commission, South-Central University for Nationalities, Wuhan 430074, China |
| |
| Abstract: | Recent research suggests that major-ion composition of seawater changed significantly during the Phanerozoic.These secular variations in seawater composition,particularly with respect to x(Mg)/x(Ca) ratios are driven mainly by changes in the spreading rates along mid-ocean ridges,govern synchronized oscillations in the mineralogical composition of potash evaporates and marine nonskeletal carbonate components as well as skeletal carbonate components.This correlated with previously proposed calcite and aragonite seas. This paper has summarized the chemical evolution of the Phanerozoic seawaters,emphasizing its geological implications in carbonate sedimentation and biotic evolution.The oscillated chemical composition of seawater and the preliminary mineralogy of marine carbonates must have resulted in different carbonate sedimentation and early diagenesis,and even in late diagenesis.It is also demonstrated that the secular variation in the x(Mg)/x(Ca) ratio of seawater has not only controlled Phanerozoic oscillations in hypercalcification by simple taxa,but also has strongly influenced their skeletal evolution.Phanerozoic marine mass extinctions and their subsequent recoveries even recorded the influence of the x(Mg)/x(Ca) ratio of seawater on biotic evolution,such as in the Permo-Triassic transition.Comprehension is thus crucial in understanding the evolution of ecosystem through the Phanerozoic. |
| |
| Keywords: | chemical composition of seawater carbonate sedimentation biotic evolution Phanerozoic |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
