depositional

This article discusses and summarizes uraniferous characteristics of paleochannel depositional systems based on depositional characteristics of fluvial systems and geochemical behaviour of uranium.

本文通过对各类积特点研究，结合铀地球化学行为，探讨积体系赋铀性。

Compared to supersequence boundaries, the depositional hiatus at sequence boundaries is shorter and sequence boundaries are not compatible with lithostratigraphic unit boundaries.

积层序界面处积间断时间相对超层序界面要短，与岩石地层单位界面不一致。

Ichnofabric analysis displays a rising significance on accurate environmental interpretation of sedimentary units in oil-bearing basin and precise recognition of depositional disconuities.

近年来，遗迹组构分析其日益增长意义主要表现在含油气盆地地层单元成因环境解释和各类不连续面细识别。

Nonmarine sequence stratigraphy is used to analyze Jurassic depositional sequences in Tu-ha basin, and three sequences and one supersequence are divided in this paper.

本文应用陆相层序地层学方法对吐哈盆地侏罗系积层序进行了综合分析，划分出三套层序和一套超层序。

These basins were generally filled with upward fining and deepening sedimentary sequence that comprises nonmarine to marine, shallow marine to deep marine depositional systems.

在盆地内堆积了从陆相到海相，从浅水到深水各种沈积体系，组成向上变细和变深充填序列。

With stromatolite but no desiccation crack, the depositional environment of Middle-Late Cambrian in the area was intertidal zone to subtidal zone with the shallow-water features.

根据其中叠层石和无明显泥裂构造，推测为潮间带-局限潮下带积环境。

The paper has summarized systematically evolutionary law in time and space on petrofacies and paleogeography of Late Paleozoic era in Northern China and distributive law of depositional systems.

根据华北晚古生代积岩系环境标志,识别出29个相,归并为冲积扇、、三角洲、潮汐砂滩、碳酸盐台地等6个积体系。