陆相层序的“非常规”体系域构成:层序地层学的一个重要进展

发布时间：2018-06-17 15:08

本文选题：“常规”体系域 + “非常规”体系域　；参考：《古地理学报》2017年03期

【摘要】：在层序地层学的Exxon时代,在强调陆上不整合面形成层序界面的概念体系中,科学家们总结认为,陆相层序形成在基准面上升期间,以一个从聚合的河道相砂岩到孤立的河道相砂岩组成的向上变细的沉积序列为特征,这代表了一个重要的概念进步;但是,运用海相层序地层的"体系域"名称,如海侵体系域和高水位体系域等,来划分和解释陆相层序的时候,又产生了若干的概念体系不协调。基于此,产生了陆相层序体系域构成的"非常规"体系域概念,成为陆相层序研究的第2个概念进步。更为重要的是,与海相地层一样,主要的沉积作用发生在基准面上升期间,但是,在基准面下降期间也可能产生相应的沉积,从而进一步说明了陆相地层复杂的堆积作用和响应机制,也表明了陆相层序更多的变化性。陆相层序的上述特征成为近年来关注的焦点之一。追逐这些概念变化和进步,将有益于深入理解陆相层序复杂的形成过程而具有重要的科学意义,同时也代表了层序地层学研究的一个重要进展。
[Abstract]:In the Exxon era of sequence stratigraphy, in the conceptual system that emphasizes the sequence interfaces of land-based unconformity surfaces, scientists concluded that continental sequences were formed during the rise of the base-level. Characterized by an upward thinning of sedimentary sequences from convergent river facies sandstone to isolated channel facies sandstone, which represents an important conceptual advance; however, using the name "system tract" of marine sequence stratigraphy, For example, transgressive system tracts and high water level system tracts are used to divide and interpret continental facies sequences, and some conceptual systems are not coordinated. Based on this, the concept of "unconventional" system tract composed of continental sequence system tracts is produced, which becomes the second concept progress in the study of continental sequence. More importantly, as in the marine strata, the main deposition occurs during the elevation of the datum level, but the corresponding deposition may occur during the descent of the datum level. The complex accumulation and response mechanism of the continental strata are further explained, and the variability of the continental sequence is also indicated. The above characteristics of continental sequences have become one of the focuses in recent years. The pursuit of these conceptual changes and advances will be of great scientific significance in understanding the complex formation process of continental sequence, and it also represents an important progress in sequence stratigraphy.
【作者单位】：中国地质大学(北京)地球科学与资源学院;
【基金】：国家自然科学基金项目(编号:41030318)资助~~
【分类号】：P539.2

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