Arid
DOI10.1016/j.geomorph.2008.05.032
Alluvial evidence for major climate and flow regime changes during the middle and late Quaternary in eastern central Australia
Nanson, Gerald C.1; Price, David M.1; Jones, Brian G.1; Maroulis, Jerry C.2,3; Coleman, Maria1; Bowman, Hugo1; Cohen, Timothy J.1; Pietsch, Timothy J.4; Larsen, Joshua R.1,5
通讯作者Nanson, Gerald C.
来源期刊GEOMORPHOLOGY
ISSN0169-555X
出版年2008
卷号101期号:1-2页码:109-129
英文摘要

As a low-gradient and region spanning the tropics to the temperate zone, the Lake Eyre basin has undergone gentle late Cenozoic crustal warping leading to substantial alluvial deposition, thereby forming repositories of evidence for palaeoclimatic and palaeohydrological changes from the Late Tertiary to the Holocene. Auger holes and bank exposures at five locations along the lower 500 km of Cooper Creek, a major contributor to Lake Eyre in the eastern part of the basin, yielded 85 luminescence dates (TL and OSL) that, combined wit a further 142 luminescence dates from northeastern Australia, have established a chronology of multiple episodes of enhanced flow regime from about 750 ka to the Holocene. Mean bankfull discharges on Cooper Creek upstream of the Innamincka Dome at 250-230 ka or oxygen isotope stages (OIS) 7-6 are estimated to have been 5 to 7 times larger than those of today, however, substantially less reworking has occurred during and after OIS 5 than before. Lower Cooper Creek appears to have similarly declined. In the Tirari Desert adjacent to Lake Eyre there is evidence of widespread alluvial activity, perhaps during but certainly before the Middle Pleistocene, yet the river became laterally restricted in OIS 7 to 5. While the Quaternary has been characterised by a dramatically oscillating wet-dry climate, since oxygen isotope stage OIS 7 or 6 there has been a general decline in the magnitude of the episodes of wetness to which the eastern part of central Australia has periodically returned. During the last full glacial cycle, Cooper Creek’s periods of greatest runoff and sand transport were not during the last interglacial maximum of OIS 5e (132-122 ka) but later in OIS 5 when sea levels and global temperatures were substantially below those of 5e or today. Fluvial activity returned in OIS 4 and 3, but not to the extent of mid and late OIS 5: strongly seasonal but still powerful flows transported sand and fed source-bordering dunes in OIS 5 and 3. This chronology of fluvial activity in the late Quaternary broadly coincides with that for rivers of southeastern Australia and suggests that the wet phases in eastern central Australia have not been governed as much by the northern monsoon as by conditions in the western Pacific close to the east coast both north and south. Flow confinement within the Innamincka Dome has locally amplified Cooper Creek’s energy, and here evidence exists for short but high-magnitude episodes of flow during the Last Glacial Maximum and in the early to middle Holocene, conditions that were capable of forming large palaeochannels but that were not long-lived enough to rework the river’s extensive floodplains elsewhere along its length. (C) 2008 Elsevier B.V. All rights reserved.


英文关键词Australian aridity Quaternary palaeoclimate Palaeohydrology Alluvial chronostratigraphy Luminescence dating Lake Eyre basin
类型Article ; Proceedings Paper
语种英语
国家Australia
收录类别CPCI-S ; SCI-E
WOS记录号WOS:000260578500011
WOS关键词LOWER NEALES RIVER ; LAKE-EYRE ; COOPER-CREEK ; BEDLOAD TRANSPORT ; SEA SEDIMENTS ; HUMAN IMPACT ; 100 KA ; QUARTZ ; STRATIGRAPHY ; HOLOCENE
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
来源机构Commonwealth Scientific and Industrial Research Organisation
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/157455
作者单位1.Univ Wollongong, Sch Earth & Environm Sci, Wollongong, NSW 2522, Australia;
2.Univ So Queensland, Fac Educ, Toowoomba, Qld 4350, Australia;
3.Univ So Queensland, Australian Ctr Sustainable Catchments, Toowoomba, Qld 4350, Australia;
4.CSIRO, Canberra, ACT 2601, Australia;
5.Australian Nucl Sci & Technol Org, Inst Environm Res, Menai, NSW 2234, Australia
推荐引用方式
GB/T 7714
Nanson, Gerald C.,Price, David M.,Jones, Brian G.,et al. Alluvial evidence for major climate and flow regime changes during the middle and late Quaternary in eastern central Australia[J]. Commonwealth Scientific and Industrial Research Organisation,2008,101(1-2):109-129.
APA Nanson, Gerald C..,Price, David M..,Jones, Brian G..,Maroulis, Jerry C..,Coleman, Maria.,...&Larsen, Joshua R..(2008).Alluvial evidence for major climate and flow regime changes during the middle and late Quaternary in eastern central Australia.GEOMORPHOLOGY,101(1-2),109-129.
MLA Nanson, Gerald C.,et al."Alluvial evidence for major climate and flow regime changes during the middle and late Quaternary in eastern central Australia".GEOMORPHOLOGY 101.1-2(2008):109-129.
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