| DOI: | 10.1016/j.earscirev.2019.103062
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| 论文题名: | On the geological significance of clastic parasequences |
| 作者: | Colombera L.; Mountney N.P.
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| 刊名: | Earth Science Reviews
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| ISSN: | 00128252
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| 出版年: | 2020
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| 卷: | 201 | | 语种: | 英语
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| 中文关键词: | Autogenic
; Delta lobe
; Sea level
; Sequence stratigraphy
; Shallow marine
; Shoreface
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| 英文关键词: | clastic sediment
; delta
; depositional sequence
; parasequence
; Quaternary
; sea level change
; sequence stratigraphy
; shoreline
; spatiotemporal analysis
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| 英文摘要: | 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. © 2019 The Authors |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/166042
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| Appears in Collections: | 气候变化与战略
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作者单位: | School of Earth & Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom
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| Recommended Citation: | |
Colombera L.,Mountney N.P.. On the geological significance of clastic parasequences[J]. Earth Science Reviews,2020-01-01,201
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