Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0022-1694 |
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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