DOI: 10.1016/j.quascirev.2017.02.015
Scopus记录号: 2-s2.0-85019587760
论文题名: Lacustrine-fluvial interactions in Australia's Riverine Plains
作者: Kemp J. ; Pietsch T. ; Gontz A. ; Olley J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 166 起始页码: 352
结束页码: 362
语种: 英语
英文关键词: Electromagnetic survey
; Lachlan River
; Lake Mungo
; LGM
; Palaeochannels
; Palaeohydrology
; Quaternary
; Willandra Lakes
Scopus关键词: Ecology
; Glacial geology
; Lakes
; Landforms
; Sediments
; Surficial sediments
; Surveys
; Water levels
; Electromagnetic surveys
; Lachlan
; Palaeochannels
; Palaeohydrology
; Quaternary
; Rivers
英文摘要: Climatic forcing of fluvial systems has been a pre-occupation of geomorphological studies in Australia since the 1940s. In the Riverine Plain, southeastern Australia, the stable tectonic setting and absence of glaciation have combined to produce sediment loads that are amongst the lowest in the world. Surficial sediments and landforms exceed 140,000 yr in age, and geomorphological change recorded in the fluvial, fluvio-lacustrine and aeolian features have provided a well-studied record of Quaternary environmental change over the last glacial cycle. The region includes the Willandra Lakes, whose distinctive lunette lakes preserve a history of water-level variations and ecological change that is the cornerstone of Australian Quaternary chronostratigraphy. The lunette sediments also contain an ancient record of human occupation that includes the earliest human fossils yet found on the Australian continent. To date, the lake-level and palaeochannel records in the Lachlan-Willandra system have not been fully integrated, making it difficult to establish the regional significance of hydrological change. Here, we compare the Willandra Lakes environmental record with the morphology and location of fluvial systems in the lower Lachlan. An ancient channel belt of the Lachlan, Willandra Creek, acted as the main feeder channel to Willandra Lakes before channel avulsion caused the lakes to dry out in the late Pleistocene. Electromagnetic surveys, geomorphological and sedimentary evidence are used to reconstruct the evolution of the first new channel belt following the avulsion. Single grain optical dating of floodplain sediments indicates that sedimentation in the new Middle Billabong Palaeochannel had commenced before 18.4 ± 1.1 ka. A second avulsion shifted its upper reaches to the location of the present Lachlan River by 16.2 ± 0.9 ka. The timing of these events is consistent with palaeohydrological records reconstructed from Willandra Lakes and with the record of palaeochannels on the Lachlan River upstream. Willandra Lakes shows high inflows during the Last Glacial Maximum (∼22 ka), but their subsequent drying between 20.5 ka and 19 ka was caused by river avulsion rather than regional aridity. This case study highlights the benefits of combining fluvial with lacustrine archives to build complementary records of hydrological change in lowland riverine plains. © 2017 Elsevier Ltd 资助项目: We thank David Egan for granting access to the Hunthawang Homestead during its conversion from cattle station to National Park, and Jason Dillon for access to Viela. Alan Pymont and Nathan Smith assisted with fieldwork. This work was supported by the Wiradjuri Condobolin Corporation and by Australian Research Council grants (DP110103081 and LP130160748) awarded to TP, JK, AG and JO. Kim Cohen and an anonymous reviewer are thanked for constructive comments that improved the text.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59219
Appears in Collections: 过去全球变化的重建
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作者单位: Australian Rivers Institute, Griffith University, Nathan, Queensland, Australia; Department of Geological Sciences, San Diego State University, San Diego, CA, United States
Recommended Citation:
Kemp J.,Pietsch T.,Gontz A.,et al. Lacustrine-fluvial interactions in Australia's Riverine Plains[J]. Quaternary Science Reviews,2017-01-01,166