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首页> 外文期刊>Australian Journal of Earth Sciences >Geoheritage significance of three Pleistocene formations recording a succession of climates and sea levels on the Yalgorup Plain in southwestern Australia
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Geoheritage significance of three Pleistocene formations recording a succession of climates and sea levels on the Yalgorup Plain in southwestern Australia

机译：三种更加优越地层在澳大利亚西南部yalgorup平原演出中海平面的三种更加优越型组合的磨牙术

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The Yalgorup Plain of southwestern Australia is underlain by two limestone formations and a linear quartz-sand formation containing limestone lenses. These limestones record carbonate deposition in seagrass banks during the Pleistocene; they are capped either by a prograding beach-ridge system of small cuspate forelands or a quartz-rich shore-parallel coastal barrier. The cuspate forelands formed behind protective offshore limestone reefs within a given Pleistocene wind-and-wave field, while the quartz-rich coastal dune barrier formed under enhanced swell conditions. These formations record three different Pleistocene interglacial depositional events, separated by unconformities, each linked to a distinct climate and mean sea level. Foraminiferal assemblages within the two limestones and within the limestone lenses of the quartz-sand formation faithfully record changes in minimum seawater temperature, reflecting these changes in climate. They indicate a cycle of warm-cool-warm water accumulation of carbonates. Such a record of both climate and sea level history for southwestern Australia is unique, contributing greatly to the Pleistocene coastal sedimentary history of limestones within southwestern Australia. These formations occur within the globally unique setting of Western Australia and are conserved within a National Park and represent an outstanding record of Quaternary coastal geomorphic development in terms of both carbonate and siliciclastic sedimentation linked to both climate and sea level changes. Given their array of lithofacies, environmental setting, sea level and climate changes, as well as their biostratigraphy reflecting these changes, these formations form a sedimentary package' that is of global geoheritage significance, with many of its inherent geological features also of global to national geoheritage significance.
机译：澳大利亚西南部的yalgorup平原是由两个石灰石的形成和含有石灰石镜片的线性石英砂形成。这些石灰石在早期期间记录海草银行中的碳酸盐沉积;它们是由漂浮的海滩岭制品覆盖小尖桩前陆或石英岸边沿海屏障。在给定的更新世风浪领域内，刺戳的前陆在保护的海上石灰石礁中形成，而在增强的膨胀条件下形成了石英丰富的沿海沙丘屏障。这些地层记录了三种不同的更新中的外夹沉积事件，由不整合分开，每个形成与不同的气候和平均海平面相连。两种石灰岩内的多孔组装，并在石英砂形成的石灰石镜片内忠实地记录最小海水温度的变化，反映了这些气候变化。它们表示碳酸盐温凉水蓄水的循环。澳大利亚西南部气候和海平面历史上的这种记录是独一无二的，为澳大利亚西南部的石灰石沿海沉积史有很大贡献。这些地层出现在西澳澳大利亚的全球独特环境中，并在国家公园内保存在国家公园内，代表了与气候和海平面和海平面变化相关的碳酸盐和矽石塑料沉降的季沿海地格术开发的出色记录。鉴于他们的岩石遗传态度，环境环境，海平和气候变化，以及他们的生物数据学反映了这些变化，这些地层形成了一个沉积的包装，即具有全球Geoheretage意义的沉积包，其许多固有地质特征也是全球对国家的许多内在的特征Geoheretage意义。

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