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Identification of the expression of earthquake-induced surface flooding by groundwater using detailed regolith mapping at the buried Atlantida Deposit, northern Chile

Alexandra Brown, Peter A. Winterburn and Thomas Bissig
Identification of the expression of earthquake-induced surface flooding by groundwater using detailed regolith mapping at the buried Atlantida Deposit, northern Chile
Geochemistry - Exploration, Environment, Analysis (April 2019) 19 (4): 474-486

Abstract

This paper describes saline pockets (10??[&U+2005;]??cm-3??[&U+2005;]??m in diameter) of fine-grained material distributed on alluvial surfaces. These saline pockets are localized along structural trends at the Atlantida buried porphyry-skarn Cu-Au-(Mo) deposit in the Atacama Region of Chile. The distribution and highly saline nature of the material suggest formation by the pooling and evaporation of groundwater forced through fractures to the surface during seismic activity. These saline pockets are a surface expression of the hydrological effects of seismic activity along faults. Saline pockets with similar distribution and characteristics were also identified at three additional alluvium-covered areas, all located in the Antofagasta Region of Chile. Identification and mapping of these saline pockets relies on the ability to identify the continuation of structures through overlying gravels. Regolith mapping using high-resolution drone imagery and digital elevation modelling identified geomorphic markers of faulting which aided mapping the distribution of saline pockets. Saline pockets provide a unique opportunity to sample the direct expression of transported groundwater reaching the surface from depth and provide a prime target medium for mineral exploration through transported gravels.


ISSN: 1467-7873
EISSN: 2041-4943
Serial Title: Geochemistry - Exploration, Environment, Analysis
Serial Volume: 19
Serial Issue: 4
Title: Identification of the expression of earthquake-induced surface flooding by groundwater using detailed regolith mapping at the buried Atlantida Deposit, northern Chile
Affiliation: University of British Columbia, Department of Earth, Ocean and Atmospheric Sciences, Vancouver, BC, Canada
Pages: 474-486
Published: 20190412
Text Language: English
Publisher: Geological Society Publishing House, London, United Kingdom
References: 34
Accession Number: 2019-042738
Categories: HydrogeologyEconomic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
S27°00'00" - S26°30'00", W70°07'60" - W69°30'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201922
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