On the geological significance of clastic parasequences
On the geological significance of clastic parasequences
复制标题
论碎屑准层序的地质意义
DOI：
10.1016/j.earscirev.2019.103062
复制
发表时间：
2020
影响因子：
12.1
通讯作者：
Colombera L
中科院分区：
文献类型：
--
作者：
Colombera L
在浅海成因的碎屑沉积序列中发现的准层序被一些地质学家认为是沉积层序的基本组成部分，尽管在其定义和应用方面存在一些问题，而另一些地质学家则主张放弃将其作为正式的层序地层单位。为了阐明碎屑准层序的地质意义，并为它们在地层学中的应用提供信息，在综合了科学文献中现有的露头和地下研究数据的基础上，对1163个准层序的几何、相特征和沉积时间尺度进行了定量表征。通过数据库编译，根据解释的单元地质成因，并考虑到偏差和不确定性的来源，分析了所研究的副层序的属性。特别强调对以下方面的评估：(i)启发式的重要性，以及识别准序列时数据类型和覆盖范围的重要性；（ii）在三角洲和滨地沉积体系之间以及第四纪和古岩石记录之间观察到的副层序特征差异；（iii）对准层序沉积时间尺度范围的可能解释；(4)自生动力学在三角洲准层序发育中的作用，部分基于与现代三角洲近期演化的比较。结果表明，准层序的定义和物性对比存在主观性，碎屑岩准层序的时空属性和构型属性存在显著的变异性。这就产生了不确定性，影响了将准层序作为比较由海岸线回归形成的地层组合结构的框架的使用：在使用模拟数据进行地下预测或试图对碎屑序列进行比较研究时，必须考虑到这种不确定性。
Parasequences recognized in clastic sedimentary successions of shallow-marine origin are considered by some geologists to be the fundamental building blocks of depositional sequences, even though problems in their definition and application have been identified by others, who instead advocate their abandonment as formal sequence stratigraphic units.To elucidate the geological significance of clastic parasequences and inform the debate on their use in stratigraphy, a quantitative characterization of the geometry, facies characteristics and timescale of deposition of 1163 parasequences has been undertaken based on a synthesis of data from outcrop and subsurface studies that are available in the scientific literature. Through a database compilation, the attributes of the studied parasequences are analysed with respect to the interpreted geological origin of the units, and with consideration of sources of bias and uncertainty.Particular emphasis is placed on assessing the following: (i) the importance of heuristics, and of data types and coverage in the recognition of parasequences; (ii) differences in parasequence characteristics observed across deltaic and shoreface depositional systems, and between the Quaternary and the ancient rock record; (iii) possible explanations for the range in timescales of deposition of parasequences; and (iv) the role of autogenic dynamics on the development of deltaic parasequences, partly based on a comparison with the recent evolution of modern deltas.The results demonstrate that parasequence definition and physical correlation suffer from subjectivity, and that significant variability exists in the spatio-temporal and architectural attributes of clastic parasequences. This gives rise to uncertainty that affects the use of parasequences as a framework for comparison of the architecture of packages of strata originating via shoreline regression: this uncertainty must be considered when using analogue data for subsurface predictions or when attempting comparative studies of clastic successions.
登录
查看更多内容
波浪气候、沉积物供应和砂泥转变深度：全球调查
影响因子：
2.9
作者：
D. George;P. Hill
通讯作者：
P. Hill
波浪主导的岸面陆架准层序中的不连续面、斜面和相结构
影响因子：
2
作者：
G. Hampson
通讯作者：
G. Hampson
美国新墨西哥州晚白垩世盖洛普系统的高分辨率层序地层学及其对白垩纪冰川平衡的影响
影响因子：
2
作者：
Wen Lin;J. Bhattacharya;Andrew Stockford
通讯作者：
Andrew Stockford
犹他州东部 Book Cliffs 沙漠段至 Castlegate 砂岩层段的替代层序地层模型：对下降阶段非海相、边缘海相和海相地层高分辨率相关性的影响
DOI：
10.1130/2010.0018(08
发表时间：
2010
期刊：
Field Guides
影响因子：
--
作者：
S. Pattison
通讯作者：
S. Pattison
准层序的地层学和相结构，以犹他州 Blackhawk 组 Spring Canyon 段为例
影响因子：
1.4
作者：
D. Kamola;J. Wagoner
通讯作者：
J. Wagoner