干旱区生态环境知识资源中心(Arid): The role of loess weathering in the groundwater chemistry of the Chaco-Pampean Plain (Argentina)

Arid

DOI	10.1016/j.jhydrol.2020.124984
	The role of loess weathering in the groundwater chemistry of the Chaco-Pampean Plain (Argentina)
	Armengol, S.; Ayora, C.; Manzano, M.; Bea, S. A.; Martinez, S.
通讯作者	Armengol, S
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2020
卷号	587
英文摘要	The Chaco-Pampean Plain (CPP), Argentina, is one of the most extensive loess areas in the world, higlhly productive in terms of agriculture and livestock and with a generalized groundwater signature of Na-HCO3 water type. High As concentrations have been often reported in aquifers throughout the entire CPP related to higher pH and alkalinity values. The processes leading to the groundwater from the humid Matanza-Riachuelo Aquifer System (MRAS) to acquire its alkalinity and pH have been investigated by means of detailed sampling of water and solid phases and geochemical modeling (Phreeqc code). The model has also been applied to two extra areas of the CPP with different climates: the semi-arid Rio Dulce Alluvial Aquifer (RDA), and the arid Northern area of the La Pampa province (NLP). The analyses of groundwater from the three different regions (from humid to arid) confirm the positive correlation between arsenic and the high pH and HCO3 concentrations. The model has offered insights into key soil-rock interaction parameters that determine the groundwater chemistry of the CPP. Thus, in addition to the already known calcite precipitation, Ca retention by the volcanic glass exchange complex has appeared as crucial for groundwater to acquire the characteristic Na-HCO3 signature. Moreover, the model has also highlighted the role of low CO2 pressures in attaining the high pH values measured in poorly vegetated soils. Of particular significance is the unexpected role played by the formation of secondary alumino-silicates in increasing (rather than decreasing) pH. Further investigations on the role of volcanic glass in the soil exchange properties and the chemical composition of the exchange complex together with the accurate de- termination of the clay mineralogy are needed to understand the high pH and alkalinity values of groundwater of this vast region.
英文关键词	Loess Geochemical modeling Dissolution kinetics Cation exchange Volcanic glass Arsenic
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000568819100084
WOS关键词	TRACE-ELEMENTS ; SEDIMENTARY-ROCKS ; TUCUMAN PROVINCE ; LA PAMPA ; AQUIFER ; REGION ; WATER ; DISSOLUTION ; KINETICS ; GLASSES
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/2XILL650/326242
作者单位	[Armengol, S.; Bea, S. A.] Consejo Nacl Invest Cient & Tecn, Av Rivadavia 1917,C1033AAJ, Buenos Aires, DF, Argentina; [Armengol, S.; Bea, S. A.] Inst Hidrol Llanuras Dr Eduardo J Usunoff, Av Republ Italia 780, RA-7300 Buenos Aires, DF, Argentina; [Ayora, C.] CSIC, Inst Diagnost Ambiental & Estudios Agua IDAEA, C Jordi Girona 18, Barcelona 08034, Spain; [Manzano, M.] Univ Politecn Cartagena, Escuela Ingn Caminos Canales & Puertos & Ingn Min, P Alfonso XIII 52, E-30203 Cartagena, Colombia; [Martinez, S.] Autoridad Cuenca Matanza Riachuelo ACUMAR, Esmeralda 255 PB,C1033AAJ, Buenos Aires, DF, Argentina
推荐引用方式 GB/T 7714	Armengol, S.,Ayora, C.,Manzano, M.,et al. The role of loess weathering in the groundwater chemistry of the Chaco-Pampean Plain (Argentina)[J],2020,587.
APA	Armengol, S.,Ayora, C.,Manzano, M.,Bea, S. A.,&Martinez, S..(2020).The role of loess weathering in the groundwater chemistry of the Chaco-Pampean Plain (Argentina).JOURNAL OF HYDROLOGY,587.
MLA	Armengol, S.,et al."The role of loess weathering in the groundwater chemistry of the Chaco-Pampean Plain (Argentina)".JOURNAL OF HYDROLOGY 587(2020).