The interplay of fluvial, lacustrine and aeolian deposition and erosion along the Neales Cliffs and its relevance to the evolution of Kati Thanda-Lake Eyre, central Australia, during the Quaternary

IF 0.8 4区 综合性期刊 Q3 MULTIDISCIPLINARY SCIENCES
C. Krapf, S. Lang, Mario Werner
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引用次数: 2

Abstract

ABSTRACT A high-resolution record of fluvial, aeolian and lacustrine deposits of Late Pleistocene age is exposed along the Neales Cliff in the lower reaches of the Nappamurra-Neales River, western Kati Thanda-Lake Eyre (KT-LE). Five major stratigraphic units reflect a variety of changes in sedimentary processes, depositional environments and hence palaeo-lake level fluctuations. This detailed record of a dryland terrestrial sedimentary succession in the northern part of KT-LE enables comparison to contemporaneous sequences in the southern part of KT-LE. The sedimentary record from the Neales Cliff area is placed into a continental stratigraphic framework, in which changes in sediment accumulation and depositional style are linked to climatically driven palaeo-lake level fluctuations independent of eustatic sea-level changes. Following the ~200 ka interglacial maximum, a drying-up systems tract is represented by a fluvial fining-upward trend, capped by palaeosols. A wettening-up systems tract followed, when lake level rose to +10 m AHD during the last interglacial, resulting in a lacustrine succession but punctuated by regular desiccation events. During the following drying-up systems tract, progressive lake-level fall resulted in deep incision around 100 ka, followed by enhanced fluvial deposition of fine-grained sediments. A brief rise in base level resulted in a wettening-up systems tract comprising a thin veneer of fluvial/alluvial sediments followed by extensive dune build-up and desert pavement development during the Last Glacial Maximum. Subsequent lake level fall to the present lake level of −15 m AHD, resulted in deep incision of up to 10 m by the modern day Nappamurra-Neales River.
Neales悬崖沿岸河流、湖泊和风成沉积与侵蚀的相互作用及其与澳大利亚中部Kati thanda - Eyre湖第四纪演化的关系
在kti thanda - Eyre湖(KT-LE)西部Nappamurra-Neales河下游的Neales悬崖上,发现了晚更新世的河流、风成和湖泊沉积的高分辨率记录。五大地层单元反映了沉积过程、沉积环境以及古湖平面波动的各种变化。这种对KT-LE北部旱地陆相沉积序列的详细记录,可以与KT-LE南部同时期的序列进行比较。尼尔斯悬崖地区的沉积记录被置于大陆地层格架中,其中沉积物堆积和沉积样式的变化与气候驱动的古湖泊水位波动有关,而不受海平面上升变化的影响。在~ 200ka间冰期极大期之后,一个以河流细化上升趋势为代表的干涸系统域,以古土壤为封顶。在最后一次间冰期,当湖泊水位上升到海拔高度+10米时,随后出现了一个湿润系统区,导致湖泊演替,但被定期的干燥事件打断。在随后的干枯体系域,约100 ka左右,湖面逐渐下降,形成深切口,随后细粒沉积物的河流沉积增强。在末次盛冰期,基准面的短暂上升导致了一个由河流/冲积沉积物组成的湿化系统区域,随后是广泛的沙丘堆积和沙漠路面的发展。随后的湖泊水位下降到现在的湖高- 15米,造成了现代纳帕穆尔拉-尼尔斯河长达10米的深切口。
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来源期刊
CiteScore
1.40
自引率
12.50%
发文量
17
审稿时长
>12 weeks
期刊介绍: Published since 1880, the Transactions of the Royal Society of South Australia is a multidisciplinary journal that aims to publish high quality, peer-reviewed papers of particular relevance to Australasia. There is a particular focus on natural history topics such as: botany, zoology, geology, geomorphology, palaeontology, meteorology, geophysics, biophysics, soil science and environmental science, and environmental health. However, the journal is not restricted to these fields, with papers concerning epidemiology, ethnology, anthropology, linguistics, and the history of science and exploration also welcomed. Submissions are welcome from all authors, and membership of the Royal Society of South Australia is not required. The following types of manuscripts are welcome: Reviews, Original Research Papers, History of Science and Exploration, Brief Communications, Obituaries.
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