Arid
DOI10.1016/j.jhydrol.2004.01.007
Hydrogeology of palm valley, central Australia; a Pleistocene flora refuge?
Wischusen, JDH; Fifield, LK; Cresswell, RG
通讯作者Wischusen, JDH
来源期刊JOURNAL OF HYDROLOGY
ISSN0022-1694
出版年2004
卷号293期号:1-4页码:20-46
英文摘要

The Palm Valley Oasis (Finke Gorge National Park) in and central Australia is characterised by large stands of red cabbage palm trees (Livistona mariae). How these unique plants, over 1000 km away from nearest relatives in the tropical parts of northern Australia persist, has long fascinated visitors. The hydrogeology of this area helps explain this phenomenon. Stable isotope (delta(2)H, delta(8)O) analyses shows groundwater to have a uniform composition that plots on or near a local meteoric water line. Carbon-14 results are observed to vary throughout this aquifer from effectively dead (<4%) to 87% modern carbon. Ratios of chlorine-36 to chloride range from 130 to 290 x 10(-15) Cl-36/Cl. In this region atmospheric (36) Cl/Cl ratio is around 300 x 10(-15). Thus an age range of around 300 ka is indicated if, as is apparent radioactive decay is the only significant cause of Cl-36/Cl variation within the aquifer. The classic homogenous aquifer with varying surface topography flow model is the simplest conceptual model that need be invoked to explain these data. Complexities, associated with local topography flow cells superimposed on the regional gradient, may mean groundwater with markedly different flow path lengths has been sampled. This potential flow path complexity, which is also evidenced by slight variation in groundwater cation ratios, can account for the distribution of isotope age data throughout the aquifer. Given the likely very slow travel times indicated by this aquifer’s hydraulic properties, age differences of the magnitude indicated from chlorine-36 data are feasible. The likely slow travel times (> 100 ka) along some flow paths indicate groundwater discharge would endure through and phases associated with Quaternary climate oscillations. Such a flow system can explain the persistence of this population of Palms and also highlight the possibility that Palm Valley has acted as a flora refuge since at least the mid Pleistocene. (C) 2004 Elsevier B.V. All rights reserved.


英文关键词arid palaeo-recharge chlorine-36 refugium Livistona marine groundwater
类型Article
语种英语
国家Australia
收录类别SCI-E
WOS记录号WOS:000221917600002
WOS关键词GREAT ARTESIAN BASIN ; OLD GROUNDWATER ; AMADEUS BASIN ; LAKE-EYRE ; CL-36 ; WATER ; AGE ; EPISODES ; CHLORIDE ; SYSTEMS
WOS类目Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向Engineering ; Geology ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/147426
作者单位(1)Univ New S Wales, Sch Biol Earth & Environm Sci, Sydney, NSW 2052, Australia;(2)Australian Natl Univ, Dept Nucl Phys, Canberra, ACT 0200, Australia
推荐引用方式
GB/T 7714
Wischusen, JDH,Fifield, LK,Cresswell, RG. Hydrogeology of palm valley, central Australia; a Pleistocene flora refuge?[J],2004,293(1-4):20-46.
APA Wischusen, JDH,Fifield, LK,&Cresswell, RG.(2004).Hydrogeology of palm valley, central Australia; a Pleistocene flora refuge?.JOURNAL OF HYDROLOGY,293(1-4),20-46.
MLA Wischusen, JDH,et al."Hydrogeology of palm valley, central Australia; a Pleistocene flora refuge?".JOURNAL OF HYDROLOGY 293.1-4(2004):20-46.
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