Hydrogeochemical processes in volcanic closed basins: Insights from Sr and Li isotopes in the Salar del Huasco and Lagunilla, Altiplano, Chile.

Groundwater is a critical water resource for human survival and economic development in arid and semi-arid areas. It is crucial to understand the groundwater circulation and hydrochemical evolution for sustainable management and utilization of groundwater resources in those areas. To this end, an investigation of the hydrochemical characteristics of surface water and groundwater was conducted in Nomhon, an arid area located in the Qaidam Basin, northwest China, by using hydrochemical (major and trace elements) and stable isotopes (δD and δ18O) approaches. Stable isotopes and ion ratios were analyzed to determine the recharge sources, hydrochemistry characteristics, and major hydrogeochemical processes. Meanwhile, inverse geochemistry modeling was applied to quantitatively determine the mass transfer of hydrogeochemical processes. The results showed that groundwater in the study area is mainly recharged by atmospheric precipitation in mountainous areas, and the groundwater in the center of basin might originate from ancient water in cold and humid environments. Along the groundwater flow path, the TDS of groundwater increased gradually from fresh to salty (ranging from 462.50 to 19,604.40 mg/L), and the hydrochemical type changed from Cl·HCO3–Na·Mg·Ca to Cl–Na. Groundwater chemical composition and mass balance modeling results indicated that from alluvial fan to lacustrine plain, the main hydrogeochemical processes changed from the dissolution of halite and albite and the precipitation of dolomite and kaolinite to the dissolution of halite and gypsum, precipitation of calcite, redox (SO42− reduction), and cation exchange. This study would be helpful for water resources management in this area and other similar areas.

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ARQUEOLOGÍA DE SUPERFICIE EN TAJÍN

CLIO – Arqueológica ◽

10.20891/clio.v34n2p57-76 ◽

2019 ◽

Vol 34 (2) ◽

pp. 57

Author(s):

Pedro Jiménez Lara

Keyword(s):

Gulf Coast ◽

Archaeological Site ◽

Human Scale ◽

The Law ◽

Closed Basins ◽

Great Scope ◽

Normal Scale

El sitio arqueológico de Tajín es considerado como el más importante de la Costa del Golfo, México, ubicada en una superficie de 144 hectáreas, emplazada en área de pequeñas colinas con cuencas abierta y cerradas, en una sucesión de plazas arquitectónicas edificada en plataformas semi-artificiales de manera estratificada. Edificios con terrazas soportadas por columnas cilíndricas, techos planos de gran envergadura y complejidad. Además de presentar una arquitectura sofisticada a base de lajas que dan forma a los nichos, grecas y cornisa volada, también contiene esculturas en piedra de volumen mediano y figuras a escala humana modeladas en estuco. Presenta 17 juegos de pelota y eso es un indicador de la religiosidad de sus habitantes y sus habituales, representaciones del ritual plasmado en 6 tableros usando la técnica de bajorelieves. Aquí, también, encontramos pinturas a escala normal y en miniatura. Es inconmensurable la riqueza iconográfica que marcan los hechos más relevantes de sus gobernantes.SURFACE ARCHEOLOGY IN TAJÍN ABSTRACTThe archaeological site of Tajín is considered as the most important of the Gulf Coast, Mexico, located in an area of 144 hectares, located in an area of small hills with open and closed basins, in a succession of architectural squares built on semiartificial platforms of stratified way. Buildings with terraces supported by cylindrical columns, planes of great scope and complexity. In addition to presenting a sophisticated architecture, a basis of the law that shapes the niches, fretwork and flown cornice, it also contains stone sculptures of medical volume and figures in a human scale modeled in stucco. It presents 17 ball games and that is an indicator of the religiosity of its inhabitants and their regulars, representations of the ritual embodied in 6 paintings using the technique of bas-reliefs. Here, too, we find paintings on a normal scale and in miniature. The iconographic wealth that marks the most relevant events of its rulers is immeasurable.Key words: Archeology, Tajín, Complexity, Painting, Iconography

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