Facies analysis of the Greywacke Conglomerate Formation, Glenbuck, Scotland

IF 0.5 4区地球科学 Q4 GEOLOGY

Scottish Journal of Geology Pub Date : 2022-01-25 DOI:10.1144/sjg2021-010

A. Mitten, A. Gough, A. Leslie, S. Clarke, M. Browne

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引用次数: 1

Abstract

The early Devonian Greywacke Conglomerate Formation of the Lanark Basin, southwestern Midland Valley of Scotland, has been exposed by a new road cut in the Glenbuck area, East Ayrshire, enabling a high-resolution sedimentological analysis of this unusually high-quality section. This study provides a facies analysis of the sedimentary rocks exposed in the Glenbuck area, and comparison with contemporaneous bedrock sections from across the Lanark Basin and adjacent Southern Upland High. Eleven lithofacies are identified, grouped into five associations: aggradational talus cone, progradational talus cone, debris flow lobe, fan surface aqueous-alluvial deposits, and gravel barform deposits. These comprise medial and proximal alluvial fan deposits, controlled by autogenic scour and avulsion along with general fan progradation. Contemporaneous sediments are present around Silurian inliers in the Lanark Basin and adjacent regions of the Southern Upland High. Whilst deposits in the Lanark Basin are genetically similar, contemporaneous deposits of the Southern Upland High preserve a distinctly more angular clast assemblage, indicating textural immaturity relative to those in the Lanark Basin.

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苏格兰Glenbuck地区Greywacke砾岩组相分析

苏格兰米德兰山谷西南部拉纳克盆地的早泥盆世格雷瓦克砾岩组，在东艾尔郡Glenbuck地区的一条新道路上被暴露出来，使得对这一异常高质量的剖面进行高分辨率沉积学分析成为可能。本研究对Glenbuck地区暴露的沉积岩进行了相分析，并与Lanark盆地和邻近的Southern Upland High的同时期基岩剖面进行了比较。共鉴定出11种岩相，并将其分为5组:堆积型距体锥、前积型距体锥、碎屑流瓣、扇面水冲积沉积和砾石状沉积。它们包括中部和近端冲积扇沉积，受自生冲刷和撕脱作用以及普遍的扇进积控制。Lanark盆地和南部高地邻近地区的志留系河流周围存在同生沉积。虽然拉纳克盆地的沉积在遗传上相似，但南部高地的同生沉积保留了明显更有棱角的碎屑组合，表明相对于拉纳克盆地的构造不成熟。

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来源期刊

Scottish Journal of Geology 地学-地质学

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Although published only since 1965, the Scottish Journal of Geology has a long pedigree. It is the joint publication of the Geological Society of Glasgow and the Edinburgh Geological Society, which prior to 1965 published separate Transactions: from 1860 in the case of Glasgow and 1863 for Edinburgh. Traditionally, the Journal has acted as the focus for papers on all aspects of Scottish geology and its contiguous areas, including the surrounding seas. The publication policy has always been outward looking, with the Editors encouraging review papers and papers on broader aspects of the Earth sciences that cannot be discussed solely in terms of Scottish geology. The diverse geology of Scotland continues to provide an important natural laboratory for the study of earth sciences; many seminal studies in geology have been carried out on Scottish rocks, and over the years the results of much of this work had been published in the Journal and its predecessors. The Journal fully deserves its high reputation worldwide and intends to maintain its status in the front rank of publications in the Earth sciences.