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首页> 外文期刊>Australian Geomechanics >THE GUILDFORD FORMATION RE-EVALUATED
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THE GUILDFORD FORMATION RE-EVALUATED

机译：重新评估了吉尔福德编队

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摘要

The Guildford Formation extends over a significant area of the Swan Coastal Plain from Cervantes north of Perth to Busselton in the southwest of Western Australia and forms an easily recognizable geomorphological unit - the Pinjarra Plain. The Guildford Formation was deposited as a series of coalescing alluvial fans at the foot of the Darling Scarp. These fans interfinger in the west with sandy fluvial and shallow marine sediments of the Gnangara Sand and Bassendean Sand. Along the middle reaches of the Swan River fluvial and estuarine sediments of a later alluvial complex infill a deep inset valley cut into and through the Guildford Formation. These deposits are defined as the Perth Formation. Along the middle and lower reaches of the Swan and Canning Rivers alluvial and estuarine sediments of a younger alluvial complex are found infilling a series of younger inset valleys cut into and through the Perth Formation and into the underlying bedrock. These sediments were previously considered to be lateral equivalents of the Guildford Formation but this correlation can no longer be accepted and they are defined as the Swan River Formation. Between Cervantes in the north and Bunbury in the south extensive drilling confirms a relatively simple model for the Guildford Formation. In contrast, the alluvial histories of the Perth Formation and of the Swan River Formation are complex and reveal alluvial regimes that have varied significantly over time. The complicated interrelationships between the sedimentary bodies of the Perth Formation and of the Swan River Formation are a result of both local-scale and regional-scale changes of river and channel morphology that were influenced by changes in sea level caused by climatic fluctuations during the Late Pleistocene.
机译：吉尔福德组从珀斯北部的塞万提斯一直延伸到西澳大利亚州西南部的巴瑟尔顿，在天鹅海岸平原的很大范围内延伸，形成了一个易于识别的地貌单元-平贾拉平原。吉尔福德组沉积为一系列聚积冲积扇，位于达令S脚的脚下。这些粉丝在西部与Gnangara砂和Bassendean砂的河流浅滩和浅沙沉积物相交。沿着天鹅河的中游，后来冲积层的河流和河口沉积物填充了一个深切入谷，切入并穿过吉尔福德组。这些矿床被定义为珀斯组。沿着天鹅河和坎宁河的中下游，发现了年轻冲积物的冲积和河口沉积物，填充了一系列进入和穿过珀斯组以及下伏基岩的年轻凹谷。这些沉积物以前被认为是吉尔福德组的横向等价物，但是这种联系不再被接受，它们被定义为天鹅河组。在北部的塞万提斯和南部的班伯里之间，广泛的钻探证实了吉尔福德组的一个相对简单的模型。相反，珀斯组和天鹅河组的冲积历史很复杂，并且揭示了随着时间的推移而发生显着变化的冲积状态。珀斯组和天鹅河组沉积体之间复杂的相互关系是河道和河道形态的局部和区域尺度变化的结果，这些变化受后期气候变化引起的海平面变化的影响更新世。

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