摘要
通过对迈阿密鲕粒滩与现代鲕粒滩的类比,将高分辨率的卫星激光雷达绘图与露头信息结合起来,可视化了迈阿密鲕粒滩的整体形态以及其中的沉积特征,潮汐通道的分布直接影响鲕粒滩的形态,迈阿密鲕粒滩的形成与潮汐作用有密不可分的联系;在迈阿密鲕粒滩中的沉积相主要发育交错层理的鲕粒相和生物潜穴型泥质鲕粒灰岩相,其中可见羽状交错层理以及大量的生物遗迹化石,证实迈阿密鲕粒滩的形成受到潮汐作用的影响;迈阿密鲕粒滩经历了胶结作用和溶蚀作用等多种成岩作用,其中胶结作用会破坏其孔渗性,而在溶蚀作用的影响下会增加其孔渗性。在对迈阿密鲕粒滩中的典型露头进行了实地考察后,进一步确认了迈阿密鲕粒滩是受到潮汐作用而形成的现代鲕粒滩。
By comparing the oolite in Miami(USA) with modern oolite beach, the high-resolution LiDAR mapping and field data were combined, and the overall morphology of the Miami oolite and depositional characteristics were visualized. It has been considered that the formation of the oolite unit was closely related to tidal action. The sedimentary facies of the Miami oolite contained well-developed cross-bedded ooid grainstone and burrow-mottled ooid-peloid grainstone, in which bi-directional cross-bedding and a large number of bio-relic fossils were observed, which further proved the tidal work origin of the oolite unit and later underwent cementation and dissolution. The pore permeability could be destroyed under the influence of cementation, whereas the pore permeability be enhanced under the influence of dissolution. Field investigation confirmed that the Miami oolite was analogous to modern oolite beach in origin under the agent of tidal action.
作者
刘旺威
高志前
LIU Wang-wei;GAO Zhi-qian(College of Energy,China University of Geosciences,Beijing 100083,China;Key laboratory of marine reservoir evolution and hydrocarbon enrichment mechanism,Ministry of Education,China University of Geosciences,Beijing 100083,China)
出处
《科学技术与工程》
北大核心
2020年第9期3569-3575,共7页
Science Technology and Engineering
基金
中国科学院战略先导项目(XDA14010201-02)。
