Arid
DOI10.1007/s10040-017-1533-0
Insights into Andean slope hydrology: reservoir characteristics of the thermal Pica spring system, Pampa del Tamarugal, northern Chile
Scheihing, Konstantin W.1; Moya, Claudio E.2,3; Troeger, Uwe1
通讯作者Scheihing, Konstantin W.
来源期刊HYDROGEOLOGY JOURNAL
ISSN1431-2174
EISSN1435-0157
出版年2017
卷号25期号:6页码:1833-1852
英文摘要

The thermal Pica springs, at 1,400 m above sea level (asl) in the Pampa del Tamarugal (Chile), represent a low-saline spring system at the eastern margin of the hyper-arid Atacama Desert, where groundwater resources are scarce. This study investigates the hydrogeological and geothermal characteristics of their feed reservoir, fostered by the interpretation of a 20-km east-west-heading reflection-seismic line in the transition zone from the Andean Precordillera to the Pampa del Tamarugal. Additional hydrochemical, isotope and hydrologic time-series data support the integrated analysis. One of the main factors that enabled the development of the spring-related vertical fracture system at Pica, is a disruption zone in the Mesozoic Basement caused by intrusive formations. This destabilized the younger Oligocene units under the given tectonic stress conditions; thus, the respective groundwater reservoir is made up of fractured Oligocene units of low to moderate permeability. Groundwater recharge takes place in the Precordillera at 3,800 m asl. From there groundwater flow covers a height difference of 3,000 m with a maximum circulation depth of 800-950 m, where the waters obtain their geothermal imprint. The maximal expected reservoir temperature, as confirmed by geothermometers, is 55 A degrees C. Corrected mean residence times of spring water and groundwater plot at 1,200-4,300 years BP and yield average interstitial velocities of 6.5-22 m/year. At the same time, the hydraulic head signal, as induced by recharge events in the Precordillera, is transmitted within 20-24 months over a distance of 32 km towards the Andean foothills at Pica and Puquio Nunez.


英文关键词Groundwater flow Geothermal springs Chile Seismic Arid regions
类型Article
语种英语
国家Germany ; Chile
收录类别SCI-E
WOS记录号WOS:000407923900021
WOS关键词DISSOLVED INORGANIC CARBON ; ATACAMA DESERT ; REGIONAL AQUIFER ; GROUNDWATER ; ORIGIN ; PRECIPITATION ; VARIABILITY ; ISOTOPE ; MODELS ; WATER
WOS类目Geosciences, Multidisciplinary ; Water Resources
WOS研究方向Geology ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/199460
作者单位1.Tech Univ t Berlin, Dept Appl Geosci, Hydrogeol Res Grp, D-10587 Berlin, Germany;
2.Ctr Invest & Desarrollo Recursos Hidr R09I1001, Iquique, Chile;
3.Arturo Prat Univ, Iquique, Chile
推荐引用方式
GB/T 7714
Scheihing, Konstantin W.,Moya, Claudio E.,Troeger, Uwe. Insights into Andean slope hydrology: reservoir characteristics of the thermal Pica spring system, Pampa del Tamarugal, northern Chile[J],2017,25(6):1833-1852.
APA Scheihing, Konstantin W.,Moya, Claudio E.,&Troeger, Uwe.(2017).Insights into Andean slope hydrology: reservoir characteristics of the thermal Pica spring system, Pampa del Tamarugal, northern Chile.HYDROGEOLOGY JOURNAL,25(6),1833-1852.
MLA Scheihing, Konstantin W.,et al."Insights into Andean slope hydrology: reservoir characteristics of the thermal Pica spring system, Pampa del Tamarugal, northern Chile".HYDROGEOLOGY JOURNAL 25.6(2017):1833-1852.
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