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首页> 外文期刊>Scottish Journal of Geology >The Lower Old Red Sandstone at Balmaha-Aberfoyle and its bearing on the nature of the Highland Boundary and Gualann Faults
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The Lower Old Red Sandstone at Balmaha-Aberfoyle and its bearing on the nature of the Highland Boundary and Gualann Faults

机译：Balmaha-Aberfoyle的下部老红砂岩及其对高地边界和Gualann断层的影响

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摘要

The final stages of the emplacement of the Dalradian block into Scotland are recorded in the Old Red Sandstone rocks that lie faulted against the main Dalradian belt. In the case of the Balmaha-Queen Elizabeth Forest sequence this involves the Gualann Fault, a splay of the Highland Boundary Fault, which transects c. 6.5 km of Lower Old Red Sandstone conglomerates and sandstones between Balmaha and Aberfoyle. A sequence of coarse conglomerates at Balmaha, near the top of the succession, derived from the SE, was deposited unconformably on the Highland Border Complex. This conglomerate has been studied in detail and the sequence is interpreted as an oblique section through an alluvial fan. Fitting the average dimensions of other alluvial fans to the unfolded cross-section suggests that it once extended some 5 km to the north, over the position of the Dalradian block. The conglomerate-sandstone sequence beneath was also deposited in alluvial fans that accumulated in a strike-slip, extensional basin in which units of conglomerate become progressively younger to the SW. Immediately NW of the Gualann Fault, in the Queen Elizabeth Forest, sub-horizontal red sandstones and breccias rest unconformably on the Highland Border Complex and were probably deposited beyond the reach of the coarse conglomerates.
机译：Dalradian块进入苏格兰的最后阶段记录在老红色砂岩岩石中，该岩石断层在Dalradian主带上。在巴尔马哈-伊丽莎白女王森林序列的情况下，这涉及到高兰边界断层的张开带Gualann断层，该断层与c相交。下巴尔马哈和阿伯福伊尔之间有6.5公里的下老红砂岩砾岩和砂岩。在东南部附近的巴尔马哈附近，一连串的粗大砾岩不合标准地沉积在高地边界综合体上。该企业集团已被详细研究，其顺序被解释为冲积扇的斜切面。将其他冲积扇的平均尺寸与展开的横截面相吻合表明，它曾经在达拉迪安地块的位置向北延伸约5公里。下方的砾岩-砂岩层序也沉积在冲积扇中，这些扇积堆积在走滑伸展盆地中，砾岩单元逐渐向西南部发育。在伊丽莎白女王森林中的古安断层西北部，水平高下的红砂岩和角砾岩不整合地搁置在高地边界综合体上，并且可能沉积在粗砾岩的范围之外。

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