塔斯马尼亚西部斯特拉罕四边形早泥盆世贝尔页岩相沉积与构造特征

Q3 Multidisciplinary
P. Baillie, Pr Williams
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引用次数: 2

摘要

与贝尔页岩相关的斯特拉罕四合院泥岩、粉砂岩和极细砂岩互层序厚度至少为500 m。可以定义两种广泛的关联。在下部组合中,极细砂与泥的比例在3:2至2:3之间,而在上部组合中,只偶尔出现薄砂岩层。透镜状层理、对称纹痕等沉积构造和深水沉积特征的缺失表明沉积发生在浅水。这得到了古生物学证据的支持。一些冲刷和向上细化的河床表明,在这种环境中,逐渐减弱的水流偶尔会产生沉积。贝尔页岩对应体在两个阶段被折叠。第一阶段产生的褶皱在西北向300 - 900之间,第二阶段产生的褶皱在西北向西或东南向浅层俯冲。在每个相中,解理只在局部发生。两相的褶皱在部分地区产生了初级轴向表面解理,第二相则产生了棱缩解理。第一阶段产生的褶皱振幅向盆地中心方向减小。第二阶段变形的应变轨迹沿柴火侧壁断裂方向。这些变形事件的存在和时间证明了塔斯马尼亚北部和西部Tabberabberan构造方向的均匀性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sedimentary and structural features of the Bell shale correlate (Early Devonian), Strahan quadrangle, western Tasmania
The sequence of interbedded mudstone, siltstone and very fine sandstone in the Strahan Quadrangle, correlated with the Bell Shale is at least 500 m thick. Two broad associations can be defined. The ratio of very fine sand to mud in the lower association is between 3:2 and 2:3 whereas in the upper association only occasional thin sandstone beds occur. Sedimentary structures such as lenticular bedding, symmetrical ripple marks and the lack of deep water sedimentary features suggest that deposition took place in shallow water. This is supported by palaeontological evidence. Some scouring and upward fining beds suggest that deposition from waning currents occurred sporadically within this environment. The Bell Shale correlate has been folded during two phases. The first phase produced folds plunging between 300 and 900 NW and the second phase produced folds plunging shallowly WNW or ESE. Cleavage was developed only locally during each phase. Folds of both phases produced a primary axial surface cleavage and the second phase produced crenulation cleavage in some areas. The amplitude of folds produced during the first phase decreases towards the centre of the basin. The locus of strain during the second phase of deformation was along the Firewood Siding Fault. The existence and timing of these deformation events demonstrates the uniformity in orientation of Tabberabberan structures throughout north and western Tasmania.
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来源期刊
Papers and Proceedings - Royal Society of Tasmania
Papers and Proceedings - Royal Society of Tasmania Multidisciplinary-Multidisciplinary
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