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October 1983 - April 1990
January 2005 - December 2012
January 1991 - present
Publications
Publications (71)
The El Peñón low-sulfidation epithermal deposit, located in the Paleocene metallogenic belt in the Antofagasta region, northern Chile, consists of Au-Ag bearing veins and hydrothermal breccias hosted in volcanic rocks and surrounded by alteration haloes consisting of a series of minerals, such as adularia, K-micas, and clay minerals. They are the r...
El Norte de Chile es conocido por la importante explotación cuprífera contemporánea. Las evidencias arqueológicas indican que tal explotación no es un fenómeno moderno, sino que ha existido en el Norte Grande desde al menos el Período Arcaico Tardío. Para identificar las materias primas minerales usadas en los procesos minero-metalúrgicos prehispán...
Estudio realizado en minera El Peñón, yacimiento epitermal de baja sulfidación ubicado en la región de Antofagasta. La investigación se centra en detectar y caracterizar la adularia mediante la difracción de rayos X, mineral indicador en la exploración de yacimientos epitermales de baja sulfidación, con el objetivo de realizar un perfil de distribu...
The Lower Cretaceous echinoids from the carbonate rocks of the El Way Formation, deposited in the Coloso Basin, northern Chile, are described. Six species were determined: four of them not previously reported for Fm. El Way, Temnocidaris (S.) malum (Gras, 1848), Tetragramma tenerum Smith and Rader, 2009, Leptosalenia prestensis (Desor, 1856) and Le...
Paniri volcano, in northern Chile, belongs to a volcanic chain trending across the main orientation of the Central Andean volcanic province. Field work mapping, stratigraphic sequences, and one new ⁴⁰Ar/³⁹Ar and eleven previous published ⁴⁰Ar/³⁹Ar, and K/Ar ages, indicate that the evolution of Paniri involved eruption of seven volcanic units (Malku...
Land surface temperature (LST) seems to be related to the temperature of shallow aquifers and the unsaturated zone thickness (ΔZuz). That relationship is valid when the study area fulfils certain characteristics: a) there should be no downward moisture fluxes in an unsaturated zone, b) the soil composition in terms of both, the different horizon ma...
Seabird excrements (guano) have been preserved in the arid climate of Northern Chile since at least the Pliocene. The deposits of marine organic material in coastal areas potentially open a window into the present and past composition of the coastal ocean and its food web. We use the stable isotope composition of nitrogen and carbon as well as elem...
Results of C and N isotope and elemental analyses of fishmeal.
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Results of C and N isotope and elemental analyses of untreated and treated guano samples and elemental analyses of selected samples by ICP-OES.
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(A-C) Fossil guano: the correlation of δ13C and δ15N of treated and untreated samples with increasing depth. (A) In Punta Blanca the δ13C decreases with increasing depth whereas δ15N (not shown) is not correlated. In Punta Negra (B) δ15N is lighter and (C) δ13C is heavier in the uppermost layer, but both isotope ratios show little variation between...
The δ13C composition of fishmeal (anchovy) is strongly correlated with the latitude.
Surface sediments of the same latitudinal section show a small scatter but no correlation with latitude [80].
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Molar C/N versus (A) δ15N and (B) δ13C shows the proximity to uric acid composition. Five very high C/N ratios (S1 Table) are not shown.
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Rayleigh type plots of δ15N versus ln (N wt%) are poorly correlated in (A) profile Mej.1 and (B) profile Mej.2.
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El norte de Chile es conocido por su potencial minero, donde existe un número importante de yacimientos que alojan diversas mineralizaciones. Esta riqueza mineral fue tempranamente reconocida por las sociedades prehispánicas, quienes las explotaron para lapidaria, pigmentos y metales. El presente estudio tiene como objetivo conocer las materias pri...
El registro fosilífero del Norte de Chile es bien conocido para afloramientos del Jurásico, sin embargo, la paleontología del Cretácico sólo ha sido estudiada en los últimos años para la Cuenca de Chañarcillo, Región de Atacama. Este proyecto pretende obtener la información paleontológica registrada en la Cuenca de Coloso mediante el análisis taxon...
El registro de equinoideos fósiles en el Norte Grande de Chile (20º-29ºS) se reduce a aislados hallazgos en afloramientos del Jurásico Superior y Cretácico Inferior. En la Cordillera de la Costa de Iquique, Región de Tarapacá, se exponen las rocas del Grupo Huantajaya que reúne a las formaciones Caleta Lígate, El Godo, Santa Rosa y Estación Montevi...
The analytical investigation of archaeological samples is of importance to understanding the social environment and technological capacity of the various cultures through time. In addition, comparisons between regions provide details as to technological advancements and how this information is disseminated as well as confirming contact and trade. T...
Laguna Tuyajto is a small, shallow saline water lake in the Andean Altiplano of northern Chile. In the eastern side it is fed by springs that discharge groundwater of the nearby volcanic aquifers. The area is arid: rainfall does not exceed 200mm/year in the rainiest parts. The stable isotopic content of spring water shows that the recharge is origi...
We present new findings from Pliocene marine sediments from the Mejillones Peninsula Tiburon Basin of the northern Chile continental margin that provide constraints for the global sea level record. Sedimentologic and sequence stratigraphic studies reveal facies associations of a continental shelf setting. Textural variations indicate that coarsenin...
Al sur de Antofagasta se ubica el sector Calizas La Viuda, el cual consiste en una secuencia de rocas marinas del Cretácico Inferior pertenecientes a la Formación El Way. Esta investigación se centra en la determinación de gastrópodos para los que no existen estudios relacionados con su diversidad ni con su distribución estratigráfica. Se encontrar...
La comprension del ambiente de depositacion de las secuencias triasicas en el norte de Chile es relevante para entender las condiciones geologicas de la Fase Pre-Andina, que corresponde al periodo de transicion entre el Ciclo Gondwanico (Devonico Superior-Permico Inferior) y el Ciclo Andino (Jurasico Inferior hasta el presente). En la Precordillera...
Al Sur de Antofagasta se localiza la Formación El Way, constituida por estratos de calizas y areniscas calcáreas depositadas en la cuenca transtensional Caleta Coloso (Brüggen, 1950; Wenzel, 1957; Rojas, 2009) que contiene diversos grupos de invertebrados del Cretácico Inferior. En trabajos anteriores se han determinado equinoideos Hemiaster (Larra...
Ornithogenic sediments built up by seabird-droppings ("guano") are known from various areas and age sections in the world and are potentially useful but largely unexplored proxy archives for past ocean composition. Long-lasting arid climate favoured the preservation of guano along the North Chilean and Peruvian Pacific coast. The stratified guano d...
San Pedro-Linzor volcanic chain (SPLVC) is located between 21 °45′S-22 °15′S, in the Recent volcanic arc of Central Andes. This volcanic chain comprises several volcanic edifices and dacitic domes, with a total lenght of ~65 km. Volcanic structures distributed in SPLVC show a NW-SE trending orientation and have been been built over Miocene ignimbri...
Teleseismic data recorded during one and a half years are investigated with the receiver function technique to determine the crustal and upper-mantle structures underneath the highly elevated Altiplano and Puna plateaus in the central Andes. A series of converting interfaces are determined along two profiles at 21°S and 25.5°S, respectively, with a...
A 30 km al sur de la ciudad de Taltal, afloran rocas sedimentarias, volcánicas, metamórficas e ígneas, que abarcan desde el Paleozoico temprano hasta el Reciente [1]. Dentro de estas rocas se incluyen las pertenecientes a la Formación Pan de Azúcar, de edad hettangiana temprana a sinemuriana temprana, constituida por sedimentitas marinas fosilífera...
A set of seismological stations was deployed in the Central Andes region along a ∼600 km long profile at 21°S between Chile and Bolivia and operated for a period of almost two years, from March 2002 to January 2004. Here we present the results of the tomographic inversion for P-wave velocity anomalies, based on teleseismic data recorded at the stat...
The Jurassic to Early Cretaceous magmatic arc of the Andes in northern Chile was a site of major additions of juvenile magmas from the subarc mantle to the continental crust. The combined effect of extension and a near stationary position of the Jurassic to lower Cretaceous arc favoured the emplacement and preservation of juvenile magmatic rocks on...
[1] A 400-km-long seismic reflection profile (Andean Continental Research Project 1996 (ANCORP'96)) and integrated geophysical experiments (wide-angle seismology, passive seismology, gravity, and magnetotelluric depth sounding) across the central Andes (21°S) observed subduction of the Nazca plate under the South American continent. An east dipping...
In a narrow and long marginal sea orientated parallel to what is now the north Chilean Cordillera range, marine sediments were deposited from Late Triassic until Kimmeridgian times. The last marine deposits are formed by Cretaceous sediments that occur in only few areas and therefore do not reveal any relation to the Jurassic sedimentary basin. Dur...
Active continental margins are considered as the principal site for growth of the continental crust. However, they are also
sites of recycling and destruction of continental crust. The Andean continental margin has been periodically active at least
since the early Paleozoic and allows the evaluation of the long-term relevance of these processes. Th...
Marine sediment samples were collected from the coastal cliff exposed at Hornitos (70°53'50" W, 22°17'00" S), northern Chile, and analyzed for foraminifera. The section is equivalent to the Pliocene La Portada Formation. The 25m section was sampled for biostratigraphic control of a major conglomerate event bed and to interpret the paleoenvironmenta...
Conference title - Second international maar conference, Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by Hungarian Geological Library, Budapest, Hungary, Date revised - 2009-01-01, Language of summary - English, Pages - 45, ProQuest ID - 50550764, SubjectsTermNotLitGenreText - Cerro Blanco Com...
INTRODUCCIÓN Las variaciones eustáticas del nivel del mar, junto con los cambios en el régimen tectónico y aporte sedimentario, son uno de los principales factores que controlan la distribución de las facies en una cuenca. Esto se traduce en el desarrollo de diferentes geometrías de cuerpos sedimentarios y de superficies de discontinuidad durante l...
The Mejillones Peninsula, located on the Pacific margin of Northern
Chile, contains outer shelf, shelf and coastal terrace deposits that
record the paleoceanographic, tectonic, and topographic evolution of the
region. Preliminary micropaleontologic, geochemical, sedimentological
and geochronological analyses of sedimentary sequences within the
Tibu...
Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by Hungarian Geological Library, Budapest, Hungary, Date revised - 2007-01-01, Language of summary - English, Pages - 233-256, ProQuest ID - 51394966, SubjectsTermNotLitGenreText - andesites; basalts; Chile; Cordillera de la Costa; hyaloclastite; ig...
Geological field work and audiomagnetotelluric data from two profiles crossing the West Fissure Zone in northern Chile were used to describe the geometry and structure of the fracture damaged zone surrounding this strike-slip fault system. The W–E profiles show that the width of the West Fissure Zone based on the fracture density distribution deriv...
This paper derives an estimate of the average chemical composition of the Paleozoic Andean basement, based on the geological evolution and from compilations of geochemical and isotopic analyses of Early to Late Paleozoic age metamorphic and magmatic rocks between 21° and 27°S. Geochemical and isotopic data indicate that recycling of the Early Paleo...
Exposures of metamorphic basement in the Central Andes are scarce and reconstructions of the history of the Pacific margin of Gondwanaland must rely on a few isolated outcrops. We studied two areas of exposed basement in northernmost Chile (Belen) and westernmost Bolivia (Cerro Uyarani). The Belen metamorphic complex has been known for some time an...
The Late Precambrian–Early Paleozoic metamorphic basement forms a volumetrically important part of the Andean crust. We investigated its evolution in order to subdivide the area between 18 and 26°S into crustal domains by means of petrological and age data (Sm–Nd isochrons, K–Ar). The metamorphic crystallization ages and tDM ages are not consistent...
K-Ar and Ar/Ar ages from magmatic rocks of northern Chile (18-22°S) describe duration and extent of the Tertiary and Quaternary magmatic evolution and date major tectonic events in northernmost Chile. This paper summarizes new K-Ar and Ar-Ar mineral and whole rock ages for intrusive rocks from the Precordillera, Tertiary ignimbrites and andesitic s...
Since the advent of plate-tectonic theory over 30 years ago(1,2), the geometries of subduction zones have been constrained mainly by the spatial distribution of earthquake hypocentres, known as Wadati-Benioff zones. This is due to the fact that, despite the existence of a wealth of shallow seismic reflection and refraction data, very few high-resol...
Un métamorphisme de haut grade, haute température (600-750°C) et basse pression (environ 6kb) est observé dans différents sites depuis le NW de l'Argentine jusqu'à la chaîne côtière du nord Chili, avec des âges Sm-Nd de paroxysme métamorphique à 500 Ma. Les âges K-Ar sur minéraux indiquent un refroidissement des roches métamorphiques autour de 400...
The Jurassic ammonites of the Cordillera de Domeyko have been studied in several monographies. The classic memoirs of Steinmann (1881), Tornquist (1898), Burckhardt (1903) and Stehn (1923) are particularly relevant. However, the biostratigraphic problems concerning stage boundaries arisen only in recent dates. New sedimentological and biostratigrap...
In connection with the break up of Pangaea, a marine cycle started with the ingression of the late Triassic sea in Colombia, Peru and Chile. To describe the basin evolution, we have produced computer isopach maps of the marine sediments for the stages from Norian to Kimmeridgian. The basin was essentially formed during the Sinemurian, i.e. at the s...
[ES] El Cretácico inferior en la provincia de Alicante presenta series bastante completas en las que aparecen episodios muy generalizados de materiales carbonatados de plataforma (facies purbeck y urgoniana) junto a otros de carácter hemipelágico. Se hace un estudio de las facies, que permiten precisar los ambientes de depósito. La historia sedimen...
