Potential mineral resources of the Chilean offshore: an overview

ABSTRACT The seabed included in the Chilean Exclusive Economic Zone (EEZ) has proper conditions to originate and host different ore deposits, but its geological knowledge is scarce and scattered. The existent studies are very limited in terms of geochemical and mineralogical analyses. The most signi...

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Autores principales:	García,Marcelo, Correa,Jorge, Maksaev,Víctor, Townley,Brian
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2020
Materias:	Mineral deposits Seabed Chilean Exclusive Economic Zone
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062020000100001
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spelling	oai:scielo:S0718-710620200001000012020-02-20Potential mineral resources of the Chilean offshore: an overviewGarcía,MarceloCorrea,JorgeMaksaev,VíctorTownley,Brian Mineral deposits Seabed Chilean Exclusive Economic Zone ABSTRACT The seabed included in the Chilean Exclusive Economic Zone (EEZ) has proper conditions to originate and host different ore deposits, but its geological knowledge is scarce and scattered. The existent studies are very limited in terms of geochemical and mineralogical analyses. The most significant non-energetic mineral resources off Chile correspond to Fe-Mn nodules and crusts, phosphorite deposits, gold and titanium placer deposits and massive sulfide deposits. Fe-Mn nodule sites occur in abyssal plains and seamounts, and around volcanic islands, at depths from 2,890 to 4,332 m, and can contain important concentrations of Cu and Ni (up to 1.38% Cu+Ni) and Co (up to 0.53%). Co-rich Fe-Mn crust occurrences have been reported around the Rapanui and Salas y Gómez islands, with Cu+Ni contents up to 0.3%. Phosphorite sites occur in Holocene sedimentary beds of the continental shelf off Peru and northern Chile, with P2O5 average content of 22.6%. Gold placer deposits are found in beaches and channels of southern Chile and may extend offshore probably in submarine canyons. Titanium placer deposits have been evaluated in different beaches of Chile and could also be continued offshore. Platinum anomalies have been found in channels and bays of southernmost Chile. No samples of Volcanogenic Massive Sulfide (VMS) mineralization are known in the Chilean EEZ to date. However, samples of hydrothermal vents, with potential for polymetallic VMS type mineralization, have been recovered around the Rapanui Island, and several seamount and volcanic island chains indicate favorable conditions for formation and preservation of these ore-deposits. The available geological information on the seabed of the Chilean EEZ is insufficient to estimate the real potential of its non-energetic mineral resources.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.47 n.1 20202020-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062020000100001en10.5027/andgeov47n1-3260
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Mineral deposits Seabed Chilean Exclusive Economic Zone
spellingShingle	Mineral deposits Seabed Chilean Exclusive Economic Zone García,Marcelo Correa,Jorge Maksaev,Víctor Townley,Brian Potential mineral resources of the Chilean offshore: an overview
description	ABSTRACT The seabed included in the Chilean Exclusive Economic Zone (EEZ) has proper conditions to originate and host different ore deposits, but its geological knowledge is scarce and scattered. The existent studies are very limited in terms of geochemical and mineralogical analyses. The most significant non-energetic mineral resources off Chile correspond to Fe-Mn nodules and crusts, phosphorite deposits, gold and titanium placer deposits and massive sulfide deposits. Fe-Mn nodule sites occur in abyssal plains and seamounts, and around volcanic islands, at depths from 2,890 to 4,332 m, and can contain important concentrations of Cu and Ni (up to 1.38% Cu+Ni) and Co (up to 0.53%). Co-rich Fe-Mn crust occurrences have been reported around the Rapanui and Salas y Gómez islands, with Cu+Ni contents up to 0.3%. Phosphorite sites occur in Holocene sedimentary beds of the continental shelf off Peru and northern Chile, with P2O5 average content of 22.6%. Gold placer deposits are found in beaches and channels of southern Chile and may extend offshore probably in submarine canyons. Titanium placer deposits have been evaluated in different beaches of Chile and could also be continued offshore. Platinum anomalies have been found in channels and bays of southernmost Chile. No samples of Volcanogenic Massive Sulfide (VMS) mineralization are known in the Chilean EEZ to date. However, samples of hydrothermal vents, with potential for polymetallic VMS type mineralization, have been recovered around the Rapanui Island, and several seamount and volcanic island chains indicate favorable conditions for formation and preservation of these ore-deposits. The available geological information on the seabed of the Chilean EEZ is insufficient to estimate the real potential of its non-energetic mineral resources.
author	García,Marcelo Correa,Jorge Maksaev,Víctor Townley,Brian
author_facet	García,Marcelo Correa,Jorge Maksaev,Víctor Townley,Brian
author_sort	García,Marcelo
title	Potential mineral resources of the Chilean offshore: an overview
title_short	Potential mineral resources of the Chilean offshore: an overview
title_full	Potential mineral resources of the Chilean offshore: an overview
title_fullStr	Potential mineral resources of the Chilean offshore: an overview
title_full_unstemmed	Potential mineral resources of the Chilean offshore: an overview
title_sort	potential mineral resources of the chilean offshore: an overview
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2020
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062020000100001
work_keys_str_mv	AT garciamarcelo potentialmineralresourcesofthechileanoffshoreanoverview AT correajorge potentialmineralresourcesofthechileanoffshoreanoverview AT maksaevvictor potentialmineralresourcesofthechileanoffshoreanoverview AT townleybrian potentialmineralresourcesofthechileanoffshoreanoverview
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Potential mineral resources of the Chilean offshore: an overview

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