干旱区生态环境知识资源中心(Arid): Ascotan and Carcote salt flats as sensors of humidity fluctuations and anthropic impacts in the transition zone of the Andean Altiplano

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DOI	10.1016/j.jsames.2020.102934
	Ascotan and Carcote salt flats as sensors of humidity fluctuations and anthropic impacts in the transition zone of the Andean Altiplano
	Flores-Varas, Abraham; Heine-Fuster, Inger; Lopez-Allendes, Camila; Pizarro, Hector; Castro, Daniela; Luque, Jose A.; Aranguiz-Acuna, Adriana
通讯作者	Aranguiz-Acuna, A (corresponding author), Univ Tarapaca, Biol Dept, 18 Septiembre 2222, Arica 1000000, Chile.
来源期刊	JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
ISSN	0895-9811
EISSN	1873-0647
出版年	2021
卷号	105
英文摘要	The Altiplano-Puna plateau is a climatic transition zone between the Atacama Desert, the aridest worldwide, and the Amazon basin. The salt flats of the Altiplano are hydrogeological and ecological systems highly dependent and sensitive to seasonal, interannual and inter-decadal variations in humidity; they may be markedly affected by anthropic activities. We focused on Ascot ' an and Carcote, two nearby salt flats located at more than 3,600 m of elevation at the border of Chile and Bolivia, to determinate the relationship between the depositional environments and recent hydrological conditions, which can be used as sensors of the particular climatic conditions of the Altiplano and anthropic activities in these systems. Results of analysis of sediment properties (mineralogical, geochemical and magnetic), the water (elemental composition) and diatom communities of the different springs in the salt flats showed that the water and sediments of Ascotan and Carcote salt flats were heterogeneous in granulometric, chemical, mineralogical and magnetic grain composition, both intraand inter-salt flat. The content of saline facies tended to increase in zones furthest from the edge and close to the depocenter of the basin, whose sediments were composed mainly of finer size grains. Diatom diversity and species richness differed between salt flats, which were associated with characteristics of the brine composition, grain size and magnetic properties and were mostly affected by local abiotic factors of each spring. Four sub-environments were identified based on the variables measured: alluvial, marsh, lacustrine and evaporitic, mainly defined by the recharge of water input dominated by summer rainfalls and snow melt. Our results suggest that Ascot ' an and Carcote salt flats constitute excellent sensors of the air moisture from the Amazon Basin, both current and through the Last Glacial Maximum and the Holocene. Therefore, further studies using Ascot ' an and Carcote as model systems may be focused on identifying hydro-geo-ecological changes in millennia-term variability of humid periods, in addition to short-term pressure from mining activity.
英文关键词	Altiplano High altitude wetlands Salt flats Climate Rock magnetic properties Geochemistry Diatoms
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000606795400001
WOS关键词	GROUNDWATER DISCHARGE DEPOSITS ; GENUS ORESTIAS TELEOSTEI ; SOUTHERN HIGH ANDES ; ATACAMA DESERT ; ATMOSPHERIC DEPOSITION ; CHILEAN ALTIPLANO ; CLIMATE ; ORIGIN ; CYPRINODONTIDAE ; VARIABILITY
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/348037
作者单位	[Flores-Varas, Abraham; Pizarro, Hector; Castro, Daniela; Luque, Jose A.] Univ Catolica Norte, Dept Geol Sci, Av Angamos, Antofagasta 0610, Chile; [Flores-Varas, Abraham; Castro, Daniela; Luque, Jose A.] Univ Catolica Norte, CEITSAZA, Ctr Invest Tecnol Agua Desierto, Av Angamos, Antofagasta 0610, Chile; [Heine-Fuster, Inger; Lopez-Allendes, Camila] Univ Chile, Dept Ecol Sci, Santiago 3425, Chile; [Aranguiz-Acuna, Adriana] Univ Tarapaca, Biol Dept, 18 Septiembre 2222, Arica 1000000, Chile
推荐引用方式 GB/T 7714	Flores-Varas, Abraham,Heine-Fuster, Inger,Lopez-Allendes, Camila,et al. Ascotan and Carcote salt flats as sensors of humidity fluctuations and anthropic impacts in the transition zone of the Andean Altiplano[J],2021,105.
APA	Flores-Varas, Abraham.,Heine-Fuster, Inger.,Lopez-Allendes, Camila.,Pizarro, Hector.,Castro, Daniela.,...&Aranguiz-Acuna, Adriana.(2021).Ascotan and Carcote salt flats as sensors of humidity fluctuations and anthropic impacts in the transition zone of the Andean Altiplano.JOURNAL OF SOUTH AMERICAN EARTH SCIENCES,105.
MLA	Flores-Varas, Abraham,et al."Ascotan and Carcote salt flats as sensors of humidity fluctuations and anthropic impacts in the transition zone of the Andean Altiplano".JOURNAL OF SOUTH AMERICAN EARTH SCIENCES 105(2021).