柳江盆地亮甲山组岩石地层组成及一维数字描述

Lithostratigraphic Composition and One-Dimensional Digital Description of Lower Ordovician Liangjiashan Formation in Liujiang Basin

岩石地层数字化与可视化是数字地层研究的基础,是地层学从传统离散式描述中解脱出来探索简明的、科学的描述模式的开始.以基本岩石地层单元为"地层细胞",探索了一个简单的沉积单元是如何经历侵蚀、改造、埋藏、成岩,最终形成多种复杂成层岩系的地质过程,并以自主研发的一维岩石地层数字描述系统为平台实现了对亮甲山组岩石地层的一维数字描述.经调查证实,虚拟运算的结论符合野外地质调查所观察到的现象.亮甲山组岩石地层的数字描述揭示,尽管不同地区亮甲山组地层记录表象差异显著,但它们都源自于相同的基本岩石地层单元,为定义亮甲山组岩石地层单位提供了一种新的理论、程序与技术方法,同时为定量描述古盆地系统的运动幅度、速率等细节提供了理论基础与技术方法,既节省了野外及室内研究的重复工作量,还可实现对岩石地层蕴藏信息的深度挖掘.

Lithostratigraphic digitalization and visualization is the foundation of digital stratigraphic research.It is also the first step to extricate stratigraphy from traditional discrete description and explore the new concise scientific methods.Regarding the basic lithostratigraphic units as＂lithostratigraphic cells＂,this paper explores a geological process in which a simple sedimentary sequence,through erosion,transformation,burial and diagenesis,eventually forms a variety of complex stratified rock series.A new theory,procedure and technical method for defining the lithostratigraphic units of the Liangjiashan Formation is presented in this study.The one-dimension digital description of Liangjiashan Formation is fulfilled by an independently developed software platform,RSD.The survey confirms that the conclusion drawn from virtual computation is consistent with that of the field geological investigation.The digital description of the Liangjiashan Formation reveals that its lithostratigraphic records in different regions have originated from the same basic lithostratigraphic units even though their appearances differ significantly from each other.The results provide a theoretical basis and technical feasibility for the quantitative description of such details as the motion amplitude and rate of ancient basin system,which can not only save both outdoor and indoor repeated workload,but also can help dig deeper into the information stored in the rock strata.