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海相碳酸盐鲕粒形成过程的模拟实验研究
周瑶琪,张晗,张振凯
0
(中国石油大学地球科学与技术学院,山东青岛266580)
摘要:
通过实验室模拟沉积环境的方法对鲕粒进行人工合成,探索鲕粒的形成过程及影响鲕粒形成的环境条件,实验的主要参数有体系中的藻类、体系的水动力和晶核数量。结果表明:静水条件及藻类活跃的人造海水中鲕粒的圈层结构及表面结晶程度发育最好,说明较弱的水动力及藻类的生物作用有助于鲕粒的生长;体系中碳酸钙晶核的数量是鲕粒能否形成的决定因素。根据晶核数量及反应活化能的不同,对海相碳酸盐鲕粒及泥晶灰岩的形成过程进行动力学分析。
关键词:  鲕粒  藻类  水动力  晶核
DOI:10.3969/j.issn.1673-5005.2017.03.003
投稿时间:2016-10-15
基金项目:国家自然科学基金项目(41272123)
Experiment study of synthesis for marine carbonate ooids genesis
ZHOU Yaoqi,ZHANG Han,ZHANG Zhenkai
(School of geosciences in China University of Petroleum, Qingdao 2266580, China)
Abstract:
The ooids were synthesized using the laboratory simulation of sedimentary environment, through which the process of the ooids formation and the environmental factors of influencing the ooids formation were studied. Three parameters were considered in the experiment, which are algae type, water agitation, and nucleus amount. It is found that synthesized ooids tend to have the best concentric structure and the most compact surface under hydrostatic condition and the presence of algae, indicating that quite water and the biological effect of alga are favorable conditions for ooid growth. The number of calcium carbonate crystal nucleus is also a decisive factor for the ooids formation. Based on the difference of nucleus quantity and activation energy, a kinetic study of the formation of marine calcium carbonate ooid and micrite wwas conducted as well.
Key words:  ooid  algae  water agitation  nucleus