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With the aim of studying the tectonic evolution of the Fueguian Andes,the magnetic susceptibility tensor was measured on sample rocks of the Lemaire and Yahgán Fms outcrop in the area between Paso Garibaldi and Canal Beagle in Tierra del... more
With the aim of studying the tectonic evolution of the Fueguian Andes,the magnetic susceptibility tensor was measured on sample rocks of the Lemaire and Yahgán Fms outcrop in the area between Paso Garibaldi and Canal Beagle in Tierra del Fuego. In the northern area the orientations of the K1 axis of the magnetic fabric shows a dominant directions N-S that can be correlated to the tectonic transport. In the south from Carbajal valley to Canal Beagle, the orientations are roughly E-W that are linked to the morphostructural lineations associated with a the strike-slip faults. The good correspondence between the magnetic anisotropy axis K3 and the rock foliation, permit to assign to a tectonic origin of the magnetic fabric.Fil: Esteban, Federico Damián. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de ...
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A complete Bouguer gravity map of the central-eastern part of the Isla Grande de Tierra del Fuego, and a general bathymetric chart of the Lago Fagnano have been realized, on the basis of a series of field geophysical surveys carried out... more
A complete Bouguer gravity map of the central-eastern part of the Isla Grande de Tierra del Fuego, and a general bathymetric chart of the Lago Fagnano have been realized, on the basis of a series of field geophysical surveys carried out on the Island since 1998. The regional gravity anomaly trend onshore shows a progressive negative gradient from N to S. Distinct, broadly E-W-trending gravity minima are superimposed on this regional negative gradient. They follow the main trace of the Magallanes-Fagnano fault system, which represents the western segment of the left-lateral South America-Scotia transform plate boundary. The gravity minima reflect the presence in the subsurface of restricted and elongated basins developed within the principal displacement zone of the fault system. A relative positive gravity maximum is located just at the SE corner of the Lago Fagnano, and represents the response of a partially exposed crystalline body, occupying an area 3 x 3 km wide. A 2D vertical c...
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Fil: Lodolo, Emanuele. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale; Italia
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Preliminary paleomagnetic results from seven sites located in the central Fuegian Andes, southernmost South America are presented. Sampled rocks belong to Late Jurassic basic and mesosilicatic igneous rocks cropping out in the Vinciguerra... more
Preliminary paleomagnetic results from seven sites located in the central Fuegian Andes, southernmost South America are presented. Sampled rocks belong to Late Jurassic basic and mesosilicatic igneous rocks cropping out in the Vinciguerra and Alvear ranges. Two sites have been recently dated in 72.0 ± 0.8 Ma and 74.7 ± 2.2 Ma (U/Pb SHRIMP). Declination anomalies have been interpreted as reflecting tectonic rotations of the sampling sites, therefore values of rotation were calculated by comparison with an Upper Cretaceous reference direction for stable South America. Significant counterclockwise rotations of similar magnitude (25o-50o) were found in all localities, except in one where deviation was only of 8o. Tectonic implications of these preliminary results are briefly discussed
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ABSTRACT New geophysical data (bathymetry, electrical resistivity tomography and seismic profiles) show the structural and morphological characteristic of the Peninsula Ushuaia structural high. The bathymetry and seismic data show that... more
ABSTRACT New geophysical data (bathymetry, electrical resistivity tomography and seismic profiles) show the structural and morphological characteristic of the Peninsula Ushuaia structural high. The bathymetry and seismic data show that the structural high is bordered by two troughs controlled by the E-W Beagle channel strike-slip fault system and a NW-SE extensional system. Electrical resistivity tomography profiles allow us to identify similar oriented meso-scale structures onshore at the Peninsula Ushuaia. The collected evidence supports the idea that the NW-SE extensional system should be younger than the E-W system.
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The current tectonic arrangement of Tierra del Fuego and Antarctica is the product of an extensive and complex evolution that involved the most southern part in South America (SA) from the Early Mesozoic when a subduction area settles... more
The current tectonic arrangement of Tierra del Fuego and Antarctica is the product of an extensive and complex evolution that involved the most southern part in South America (SA) from the Early Mesozoic when a subduction area settles down along the Pacific border of Gondwana (GDW) including the then continuous SA and Antarctic Peninsula (AP) (Dalziel and Elliot, 1973; Dalziel,
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Within an area of around 119 km2 at Danco Coast (64° 09' SL y 60° 57' WL) a geophysical onshore/offshore survey was carried out during the 2005-06, 2006-07 and 2008-09 Antarctic summers. The Upper Cretaceous to Tertiary volcanic... more
Within an area of around 119 km2 at Danco Coast (64° 09' SL y 60° 57' WL) a geophysical onshore/offshore survey was carried out during the 2005-06, 2006-07 and 2008-09 Antarctic summers. The Upper Cretaceous to Tertiary volcanic rocks intruded by a granodioritic pluton which outcrop in coastal areas belongs to the Mesozoic magmatic arc. Leucocratic and melanocratic andesitic dykes
Research Interests: Geology, Oceanography, Magnetic field, Geophysical Survey, Topography, and 12 moreUpper Cretaceous, Magnetic Susceptibility, Spatial Distribution, Total Length, Antarctic Peninsula, Information Gain, Volcanic Rock, Geological Processes, Submarine Pipeline, Magnetic Anomalies, Coastal Area, and peninsula
The Andean Chain undergoes a 90 degrees bend at around 52 S, from N-S to the north to E-W to the south. This feature is called the Patagonian orocline and its origin and evolution have been much debated. Since the first paleomagnetic test... more
The Andean Chain undergoes a 90 degrees bend at around 52 S, from N-S to the north to E-W to the south. This feature is called the Patagonian orocline and its origin and evolution have been much debated. Since the first paleomagnetic test performed by Dalziel et al. in the early seventies that suggested a secondary bend, several paleomagnetic studies
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A comprehensive suite of field surveys was carried out by a team of Italian and Argentinean scientists in South America's Tierra del Fuego region to investigate the... more
A comprehensive suite of field surveys was carried out by a team of Italian and Argentinean scientists in South America's Tierra del Fuego region to investigate the 600-km-long Magallanes-Fagnano fault system (MFS), a transform-type margin that developed on continental crust (Figure 1). Identifying and analyzing the morphological and structural elements related to the MFS and understanding mechanisms of slip along
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A geophysical campaign has been developed along Danco Coast between Py Point to the south, and Vivot Cape to the north- with the aim of acquire new data to define the geometry, lateral relationships and tectonic development of the... more
A geophysical campaign has been developed along Danco Coast between Py Point to the south, and Vivot Cape to the north- with the aim of acquire new data to define the geometry, lateral relationships and tectonic development of the geologic units of the Mesozoic magmatic arc exposed in the western border of the Antarctic Peninsula. Rock outcrops mostly belong to plutonic bodies of granitic through tonalitic composition, and rhyolites, andesites and basaltic rocks. The geologic survey included the lithologic and structural sampling, a total of 216 rock cores were obtained for AMS and paleomagnetic studies. The acquired data have been GPS referred. The magnetic survey was carried out with two magnetometers of the proton free-precession: a Scintrex ENVI GRAD (used as permanent base which registered continuously in cycles every 30 seconds and obtained about 88900 data) and a Geometrics G856 magnetometer employed for sampling stations (which measured the intensity of the of the total magn...
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... stations located in both the South America and Scotia sides of the fault system in the Tierra del Fuego region [Del Cogliano et ... order of magnitude is consistent with field observations and kinematic analyses of fault populations... more
... stations located in both the South America and Scotia sides of the fault system in the Tierra del Fuego region [Del Cogliano et ... order of magnitude is consistent with field observations and kinematic analyses of fault populations conducted along the MFS near Monte Hope [Klepeis ...
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... Alejandro Tassone 1 *, Melina Santomauro 1 , Marco Menichetti 2 , María Elena Cerredo 3 , Marcela Beatriz Remesal 3 , Horacio Lippai 1 ... and some structural features and major lithological characteristics in the first tens to... more
... Alejandro Tassone 1 *, Melina Santomauro 1 , Marco Menichetti 2 , María Elena Cerredo 3 , Marcela Beatriz Remesal 3 , Horacio Lippai 1 ... and some structural features and major lithological characteristics in the first tens to several hundred meters below surface (Caputo et al ...
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We present a general bathymetric map of Lago Fagnano, the largest ice-free lake of the Southern Hemisphere, located in the central part of the Tierra del Fuego Island. The map has been obtained compiling all the available bathymetric... more
We present a general bathymetric map of Lago Fagnano, the largest ice-free lake of the Southern Hemisphere, located in the central part of the Tierra del Fuego Island. The map has been obtained compiling all the available bathymetric soundings and depth-converted high-resolution seismic profiles, collected in the course of several geophysical campaigns. The lake occupies a 110-km long, EW trending tectonic depression within the southernmost tip of the Andean Cordillera, where the South America-Scotia plate boundary traverses the ...
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It is not known whether the Patagonian Orocline, the major bend of the southern Andes at the southern tip of South America, is a primary or secondary feature. Palaeomagnetic data along the Patagonian Orocline are still too scarce to... more
It is not known whether the Patagonian Orocline, the major bend of the southern Andes at the southern tip of South America, is a primary or secondary feature. Palaeomagnetic data along the Patagonian Orocline are still too scarce to provide a reliable and unambiguous answer to this question. New palaeomagnetic results on Late Jurassic–Late Cretaceous magmatic units along the central segment of the Fuegian Cordillera are reported. Data from four Late Cretaceous small intrusions and three sites on Late Jurassic–Early Cretaceous metabasalts and metagabbros showed anticlockwise declination deviations between 21° and 46° with respect to South America. From these and previous data, a picture of a nearly homogeneous post-Late Cretaceous regional rotation of the central Fuegian Cordillera is suggested. This supports a model of nearly 30° of anticlockwise secondary bending of the Patagonian Orocline since the Late Cretaceous (72 Ma). Lack of rotation of post-50 Ma sedimentary rocks exposed t...
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Lago Fagnano, an E-W elongated basin located in the central part of Isla Grande de Tierra del Fuego, occupies a structural depression originated along a segment of the Magallanes-Fagnano fault system. Its evolution was mostly conditioned... more
Lago Fagnano, an E-W elongated basin located in the central part of Isla Grande de Tierra del Fuego, occupies a structural depression originated along a segment of the Magallanes-Fagnano fault system. Its evolution was mostly conditioned by tectonic process, and later was affected by glacial and glacio-lacustrine depositional events. New high-resolution single-channel seismic data, integrated with published seismic profiles and geological information acquired in the surroundings of the Lago Fagnano, allows us to reconstruct the basement surface of the lake, and the geometry and thickness of glacial and glacio-lacustrine sequences. We recognized three main sub-basins within the Lago Fagnano: (1) a medium-size (ca. 21 x 5 km), deep (373 m), and asymmetrical basin to the east; (2) an E-W trending (44 x 3 km), shallower (150 m) central sub-basin; and (3) a smaller (3.5 x 1.3 km), shallow (128 m) sub-basin to the west. The shape of the sub-basins and their location in relation with the M...
A geological and geophysical study in fluvial post-pampean sediments cropping out on the right bank of the Río Areco was carried out. The sequence studied comprises the Guerrero and Río Salado members of the Luján Formation, in which... more
A geological and geophysical study in fluvial post-pampean sediments cropping out on the right bank of the Río Areco was carried out. The sequence studied comprises the Guerrero and Río Salado members of the Luján Formation, in which three palaeosols are ...