英国宾夕法尼亚州中部Millstone Grit群早期Marsdenian亚相的综合层序地层分析

IF 0.5 4区 地球科学 Q4 GEOLOGY
M. Brettle, C. Waters, S. Davies
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引用次数: 0

摘要

Pennines的早期Marsdenian亚阶(Millstone Grit群)包括由含菊石的海带分隔的重复三角洲旋回。这种旋回性受冰川升降和沉积物供应调节的合力控制,为层序地层学原理的应用提供了一个重要的露头区。提出了一个新的相关性框架,其中识别了两个序列阶:(1)低阶序列,其中海洋带(R2a1、R2b1、R2b2和R2b3)代表最大洪泛面;(2)嵌套在低阶序列中的高阶序列。通过整合和关联关键暴露、历史钻孔和现场测绘,观察了岩相和相组合的横向变化,并绘制了古地理趋势图。这允许解释序列和系统道堆叠模式的变化。推断出Milankovich旋回性的三阶控制序列叠加模式;长持续时间(~400ka)离心率振荡控制由R2a1和R2b2海洋带代表的最大洪水事件,低于100ka的倾角振荡(控制R2b1、R2b2和R2b3海洋带和介入的低阶序列边界),以及进动频率(~25ka),这些频率可以控制高阶序列的周期性。补充材料:https://doi.org/10.6084/m9.figshare.c.6408203
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An integrated sequence stratigraphic analysis of the early Marsdenian substage of the Millstone Grit Group, Central Pennines, UK
The early Marsdenian substage (Millstone Grit Group) of the Pennines comprises repeated deltaic cycles separated by ammonoid-bearing marine bands. This cyclicity, controlled by the combined forces of glacio-eustasy and modulations in sediment supply, provides an important outcrop area for the application of sequence stratigraphic principles. A new correlation framework is presented where two orders of sequence are identified: – (1) a low-order sequence, within which marine bands (R 2a 1, R 2b 1, R 2b 2 and R 2b 3) represent a maximum flooding surface, and (2) high-order sequences nested within the low-order sequences. By integrating and correlating key exposures, historic well boreholes and field mapping, lateral changes in facies and facies association are observed, and palaeogeographic trends mapped. This allows the variation in sequence and systems tract stacking patterns to be interpreted. Three orders of Milankovitch cyclicity are inferred to control the sequence stacking patterns; long-duration (∼400ka) eccentricity oscillation controlling maximum flooding events represented by the R 2a 1 and R 2b 2 marine bands, sub-100ka obliquity oscillations (controlling the R 2b 1, R 2b 2 and R 2b 3 marine bands and intervening low-order sequence boundaries), and precessional frequencies (∼25ka) which may control the periodicity of the high-order sequences. Supplementary material: https://doi.org/10.6084/m9.figshare.c.6408203
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来源期刊
CiteScore
2.00
自引率
30.00%
发文量
7
审稿时长
>12 weeks
期刊介绍: The Proceedings of the Yorkshire Geological Society (PYGS) has been published without a break since 1839. It is one of the leading journals of British geology. Each year two parts are issued containing original research papers on all aspects of geology. Traditionally the Proceedings has given particular attention to the geology of northern England and its neighbouring areas. The submission of papers on related topics but of a more general interest is encouraged. All papers are subjected to the full scrutiny of two independent referees.
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