利用有孔虫的多样性和丰富度对英格兰北部和苏格兰边界的Asbian-Brigantian边界进行高分辨率定义和对比

IF 0.5 4区 地球科学 Q4 GEOLOGY Proceedings of the Yorkshire Geological Society Pub Date : 2023-08-17 DOI:10.1144/pygs2023-003
P. Cózar, I. Coronado, I. Somerville, M. Hounslow
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引用次数: 0

摘要

Asbian亚阶和Brigantian亚阶(中密西西比亚阶)过渡层的有孔虫多样性和分类群丰富度显示出长期变化的模式,从而可以建立详细的区域间相关性。阿斯克里格地块、斯坦莫尔海槽、阿尔斯通地块、南坎布里亚大陆架和索尔韦盆地的有孔虫显示出类似的长期变化(有孔虫趋势,FT),这使得可以与Janny Wood的基底Brigantian地层类型进行关联。尽管缺乏一致的微体化石首次出现标志物来识别布里甘阶基底,但可以通过有孔虫的趋势来自信地识别这一层位。FT允许在先前研究中对该边界提出质疑或有争议的部分中精确定位相关布里甘阶的基底,并修正阿斯比安晚期和布里甘阶基底期间有孔虫带和亚带的位置。这种类型的分析与有孔虫带、出水面和岩性旋回性相结合,为高分辨率对比提供了一种可靠的方法。这种方法在采样最密集的剖面中提供了最小的不确定性,而对于采样强度较低的剖面,则存在更多的相关性不确定性。
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High-resolution definition and correlation of the Asbian-Brigantian boundary in northern England and the Scottish borders, using foraminiferal diversity and richness
Foraminiferal diversity and taxa richness from beds transitional between the Asbian and Brigantian substages (Middle Mississippian) show patterns of secular change which allow detailed inter-regional correlations to be established. Foraminifera from the Askrigg Block, Stainmore Trough, Alston Block, South Cumbria Shelf and Solway Basin show similar secular changes (foraminiferal trends, FTs), allowing correlation to be made with the basal Brigantian Stratotype at Janny Wood. Despite the absence of consistent microfossil first occurrence markers for the recognition of the base of the Brigantian, this horizon can be confidently recognised by means of foraminiferal trends. The FTs allow the precise location of the base of the correlated Brigantian in sections where this boundary was questioned or controversial in previous studies, as well as to amend the position of the foraminiferal zones and subzones during the late Asbian and basal Brigantian. This type of analysis when used in combination with foraminiferal zonations, emergent surfaces and lithological cyclicity, together, provide a robust means for high-resolution correlation. This methodology, provides the least uncertainty in sections that have been most densely sampled, whereas for less intensely sampled sections there is more correlation uncertainty.
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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.
期刊最新文献
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