Cesar Arriagada

University of Chile · Departamento de Geología

In this chapter, we present seismic evidence of the interaction between inverted normal faults and reverse faults under the southern Salar de Atacama Basin in the western Central Andes of northern Chile. The chapter starts by presenting a summary of the main tectonic mechanism proposed by several authors to explain the structure of the basin, as we...

The study of the Cordillera de Domeyko and the Salar de Atacama Basin in northern Chile has been critical to understand the generation of the Andean Cordillera and the migration of the deformation front eastwards. However, the relation between the uplift of the range, its temporal pattern, and the formation of the Preandean Depression have not been...

The big quantity of official Chilean meteorites, 1456 at present (Meteoritical Bulletin Database). The possibility to find more in the Atacama Desert surfaces (Hutzler, 2016) and the creation of three new Chilean repositories, have brought the challenge to make grow Meteoritcs in Chile if we want to keep increasing the findings and improve the scie...

The tectonic evolution of the southwestern margin of Pangea supercontinent is represented by the extensive late Paleozoic–Triassic magmatism along the southwestern margin of South America, including the Chilean Frontal Andes batholiths as part of the Choiyoi province. Several models have proposed cessation of subduction as the reason behind the vas...

The combination of field data, balanced cross-sections, gravimetric, chronological data and apatite fission track data have allowed understand the tectonic history of the “Pampean” region of northern Chile. The regional structure is characterized by the interplay between large inverted and basement-involved reverse faults and thrust that commonly a...

La Depresión Preandina en el norte de Chile se encuentra conformada por una serie de cuencas sedimentarias (cuencas del Salar de Atacama y Salar de Punta Negra) que se extienden por casi 300 km. Se encuentra limitada al oeste y al este, por dos cinturones montañosos, la Cordillera de Domeyko y el arco volcánico actual de los Andes Centrales, donde...

actas simposio tectonica andina tucuman 2018. congreso geologico argentino

The Tarapacá Basin is one of the larger basins created on the western margin of South America during the Mesozoic times. Regional studies focused their attention on understanding its Cenozoic surface structures, traditionally interpreted as a west-verging thrust and fold belt. However, its internal and deep architecture and the influence of previou...

special issue of the journal of south american earth sciences dedicated to south american tectonics based on contributions to the first symposium of south american tectonics

Hotspots are generated by partial melting due to hot plumes rising within the Earth's mantle, and when tectonic plates move relative to the plume source, hotspot tracks form. Off South America, the oceanic Nazca Plate hosts a large population of hotspot tracks. Examples include seamounts formed far from the Pacific-Nazca spreading center (“off-ridg...

A multidisciplinary study supported by [eld data and 2-D seismic information was conducted to understand the tectonic interactions between Mesozoic to Cenozoic extensional and contractional structures along the Prean-dean Depression (23° 25°S) in northern Chile, which have been largely debated. This work gives some new ideas about the control that...

Despite the evidence for protracted deformation, crustal shortening, and exhumation since at least 100 Ma along the Central Andes, the uplift of the Eastern Cordillera and Bolivian Orocline formation did not start until the Eocene–Oligocene. Moreover, the Central Andes also exhibit much younger recent surface uplift (e.g., 10 Ma) that would postdat...

This book describes the Mesozoic to Cenozoic evolution of the Chilean and Argentinean Andes. The book is structured from a historical perspective concentrating on specific processes explained in each chapter. The chapters cover dynamic subsidence; neotectonics; magmatism; long and short term deformation; spatial development of ancient orogenic proc...

The knowledge of the tectonic architecture, timing, and the mechanisms of deformation that affected the western slope of the Chilean–Pampean flat-slab subduction segment of the Central Andes in northern Chile are a key to understand the complete evolution of this Andean segment. In Chile, this segment is composed of two tectonic provinces: The Coas...

The Salar de Atacama basin is the main topographic low of the Preandean Depression of the Central Andes of northern Chile. Although numerous studies have been carried out in this area, the origin of the depression is still a matter of debate. The integration of seismic reflection and surface structural data along the basin allows the characterizati...

We have combined 2D seismic information with field data to interpret the structure underneath the Salar de Punta Negra Basin. The interpretation of NW-SE oriented seismic profiles along the basin shows that its structure consists of a doubly-verging contractional system composed of inverted and basement-involved structures. West-verging inversion a...

The Frontal Cordillera in northern Chile is located over the flat-slab subduction segment of the Central Andes. This tectonic province is characterized by a thickskinned structural style showing evidence of tectonic inversion and basement-involved compressive structures. Field data, U-Pb geochronological and apatite fission track data were used to...

We describe extended occurrences of unusual silicate glass surface layers from the Atacama Desert (Chile). These glasses, found near the town of Pica at four localities separated by up to 70 km, are neither fulgurites, nor volcanic glasses, nor metallurgical slags related to anthropic activity, but show close similarities to other glasses that have...

La Cuenca del Salar de Punta Negras es una cuenca intra-montañosa que forma parte de la Depresión Preandina en los Andes Centrales del norte de Chile, localizada entre la Cordillera de Domeyko y el actual arco volcánico de los Andes Centrales. Estructuralmente esta limitada por una serie de cordones montañosos donde se exponen rocas del Paleozoico...

boog gathering contributions to teh first symposium on south american tectonics held in santiago de chile november 2016 arriagada, folguera, oliveros, riquelme, giambiagi eds.

The Los Pelambres porphyry copper deposit is located 190 km north of Santiago, Chile. A paleomagnetic and mineralogical study was conducted at this deposit to determine the effects of hydrothermal alteration on the magnetic properties and minerals of rocks within the deposit when compared to the surrounding country rock. In the Los Pelambres deposi...

The Andean orogenic cycle and its subduction-related magmatism along the southwestern margin of South America began during the early Jurassic after an accretionary history throughout Paleozoic times. The Chilean and Argentinian Frontal Andes batholiths, together with the Coastal Batholith, represent most of the pre-Andean orogenic cycle plutonism....

Subduction zones provide direct insight into plate boundary deformation and by studying these areas we better understand tectonic processes and variability over time. We studied the structure of the offshore subduction zone system of the Pampean flat-slab segment (~29-33°S) of the Chilean margin using seismic and bathymetric constraints. Here, we r...

Subduction zones provide direct insight into plate boundary deformation and by studying these areas we better understand tectonic processes and variability over time. We studied the structure of the offshore subduction zone system of the Pampean flat-slab segment (ca. 29–33°S) of the Chilean margin using seismic and bathymetric constraints. Here, w...

The southernmost Andes of Patagonia and Tierra del Fuego present a prominent arc-shaped structure: the Patagonian Bend. Whether the bending is a primary curvature or an orocline is still matter of controversy. New paleomagnetic data have been obtained south of the Beagle Channel in 39 out of 61 sites. They have been drilled in Late Jurassic and Ear...

The Andean orogenic belt, located in the Central Andes “Pampean flat-slab” segment in northern Chile (27–29°S), is composed of two major tectonic regions: the Coastal Cordillera and the Frontal Cordillera. To understand their internal tectonic styles, history of growth and the shortening absorbed by the upper crustal structure of this segment, we c...

The pre- and current collision of the Juan Fernández Ridge with the central Chilean margin at 31°–33°S is characterized by large-scale crustal thinning and long-term subsidence of the submarine forearc caused by subduction erosion processes. Here, we study the structure of the central Chilean margin in the ridge–trench collision zone by using wide-...

Resumen. El distrito El Espino es caracterizado por una sucesión marina (Miembro El Espino) que es parte de las cuencas extensionales formadas entre el Jurásico Superior-Cretácico Inferior y cuenta con un depósito IOCG homónimo al distrito y una serie de intrusiones. En el presente estudio se caracterizó y analizó la geología, estructura y origen d...

New paleomagnetic data from Permo-Triassic and Late Cretaceous rocks yield a consistent trend of vertical-axis-tectonic-rotations which are consistent with the Central Andean Rotation Pattern (CARP). However, three sites in the Tuina Formation and one site in the Purilactis Group record large rotations (80°). These mayor rotations are probably due...

The structure of the Chilean Frontal Cordillera, located over the Central Andes flat-slab subduction segment (27°-28.5°S), is characterized by a thick-skinned deformation, affecting both the pre-rift basement and the Mesozoic and Cenozoic infill of the NNE-SSW Lautaro and Lagunillas Basins, which were developed during the Pangea-Gondwana break-up....

The Salar de Atacama Basin holds important information regarding the tectonic activity, sedimentary environments and paleoclimate variations in northern Chile during Cretaceous times. About 4000 m of high-resolution stratigraphic columns of the Tonel, Purilactis and Barros Arana Formations reveal braided fluvial and alluvial facies, typical of arid...

The Magallanes fold and thrust belt (FTB) presents a large-scale curvature from N-S oriented structures north of 52°S to nearly E-W in Tierra del Fuego Island. We present a paleomagnetic and anisotropy of magnetic susceptibility (AMS) study from 85 sites sampled in Cretaceous to Miocene marine sediments. Magnetic susceptibility is lower than 0.0005...

The Magallanes fold and thrust belt (FTB) presents a large-scale curvature from N-S oriented structures north of 52°S to nearly E-W in Tierra del Fuego Island. We present a paleomagnetic and anisotropy of magnetic susceptibility (AMS) study from 85 sites sampled in Cretaceous to Miocene marine sediments. Magnetic susceptibility is lower than 0.0005...

The La Pampa Gneisses are an enclave of orthogneisses emplaced within late Paleozoic to Triassic granitoids of the Chollay Batholith, in the Cordillera Frontal, to the east of Vallenar. Previous geochronological data (a Rb/Sr “errorchron” of 415 ± 4 Ma) allowed to some authors to suggest that these rocks were part of the Chilenia Terrane accreted t...

In this paper we show the results of a paleomagnetic study carried out along the western Andes of central Chile from 30° to 36°S. Whereas paleomagnetic analysis from Jurassic to Late Cretaceous rocks in the Pampean flat slab segment shows small or non significant clockwise vertical-axis rotations, results obtained in Late Jurassic to Neogeone rocks...

The Arauco Basin is located on the continental shelf near the Chilean subduction zone (~ 38°S). Main deformational stages that affected this setting show a good correlation with Andean constructional phases. We studied the kinematic evolution of the Arauco Basin using high-resolution seismic reflection data across the southern Arauco forearc basin....

The Chañarcillo Basin is an Early Cretaceous extensional basin in northern Chile (27-29�°S). The folding style of the syn-rift successions along the eastern side of the basin reveals an architecture consisting of a NNE-trending anticline “Tierra Amarilla Anticlinorium”, associated with the inversion of the Elisa de Bordos Fault. A set of balanced c...

The Illapel Plutonic Complex (IPC), located in the Coastal Range of central Chile (31°-33° S), is composed of different lithologies, ranging from gabbros to trondhjemites, including diorites, tonalites and granodiorites. U/Pb geochronological data shows that the IPC was amalgamated from, at least, four different magmatic pulses between 117 and 90 M...

Plutonic rocks of the paleozoic basement and mylonite belts located in the western margin of the Frontal Cordillera in Chile (28°-30°S) evidence tectonic and magmatic processes that affected the occidental margin of Gondwana from Late Paleozoic until Middle Triassic times. In this context, the El Portillo Mylonites (EPM) are a N-S elongated belt of...

The Magallanes fold and thrust belt (FTB) presents a large-scale curvature from N-S oriented structures north of 52°S to nearly E-W in Tierra del Fuego Island. We present a paleomagnetic and anisotropy of magnetic susceptibility (AMS) study from 85 sites sampled in Cretaceous to Miocene marine sediments. Magnetic susceptibility is lower than 0.0005...

Regional and local strike-slip systems in Chile are complex and pose interesting questions, such as the interaction between strike-slip and reverse faults, how they evolve, and the relationship between shortening, rotation and uplift. Within this context, we developed a new analytical method based on analogue and numerical modelling applied to 3D,...

The Triassic and Jurassic tectonic history of northern Chile has been dominated by extension, although clear evidence about the nature and geometry of the extensional basins and subsequent inversion structures has been adequately illustrated in only a few cases. In this contribution we present a structural study of the Lautaro Basin located at the...

The Triassic and Jurassic tectonic history of northern Chile has been dominated by extension, although clear evidence about the nature and geometry of the extensional basins and subsequent inversion structures has been adequately illustrated in only a few cases. In this contribution we present a structural study of the Lautaro Basin located at the...

Regional and local strike-slip systems in Chile are complex and pose interesting questions, such as the interaction between strike-slip and reverse faults, how they evolve, and the relationship between shortening, rotation and uplift. Within this context, we developed a new analytical method based on analogue and numerical modelling applied to 3D,...

During the Paleozoic the Andean basement of central Chile and Argentina grew westwards by the amalgamation of diverse tectonostratigraphic terranes some of them derived from Laurentia. The last to be accreted, in the Devonian, corresponds to the hypothetical Chilenia terrane. However, direct evidences about the nature of its basement are scarce bec...

During the Paleozoic, South America, Arabia, Africa and East and West Antarctica were part of the Gondwana supercontinent. By the mid‐Cretaceous, South Atlantic opening was under way, and East‐Antarctica and the Antarctic Peninsula acted as a single plate. However the connection between the Antarctic Peninsula and Patagonia is still subject of deba...

Cited By (since 1996): 5, Export Date: 24 July 2012, Source: Scopus, doi: 10.1016/j.jsg.2011.03.004, Language of Original Document: English, Correspondence Address: Arriagada, C.; Departamento de Geología-Centro de Excelencia en Geotermia de Los Andes (CEGA-FONDAP), Universidad de Chile, Plaza Ercilla 803, Santiago, Chile; email: cearriag@cec.uchil...

New paleomagnetic data presented here from 61 sites in Paleozoic, Mesozoic and Cenozoic igneous and sedimentary rocks from the Antarctic Peninsula and the South Shetland Islands constrain the relative motion of the Antarctic Peninsula since the mid-Cretaceous and allow the quantification of tectonic rotation between the different blocks recognized...

AbstrACt. The Middle-Late Jurassic mafic dike swarms of central Chile between 33º and 33º45'S register the tectonic activity of the contemporaneous arc represented by the Coastal batholith. These dike swarms evidence alternate episodes of transtension and transpression across NW-striking structures, which controlled the construction of the magmatic...

The Middle-Late Jurassic mafic dike swarms of central Chile between 33° and 33°45'S register the tectonic activity of the contemporaneous arc represented by the Coastal batholith. These dike swarms evidence alternate episodes of transtension and transpression across NW-striking structures, which controlled the construction of the magmatic arc. The...

Resumen Hace mas de 20 años que el patrón de rotaciones tectónicas ha sido estudiado en los Andes centrales, destacando con estos estudios uno de los flexuramientos más dramáticos en la cadena andina: el Oroclino Boliviano, flexuramiento que se adecua a la hipótesis Oroclinal original de Carey. Diversos estudios han constatado su historial tectónic...

A magmatic arc was active along the Antarctic Peninsula’s western margin during the Mesozoic and most of the Cenozoic. We report new constraints on the geodynamic history of King George Island (South Shetland Islands, northern Antarctic Peninsula), based on a multidisciplinary approach combining structural, petrological, geochemical, geochronologic...

El Teniente porphyry copper deposit, the world’s greatest intrusion-related Cu–Mo ore body, is hosted within basaltic–andesitic volcanic and gabbroic rocks (mafic complex). This ore body is strongly affected by multiple events of alteration/mineralization with pervasive potassic and chloritic alteration and coetaneous with associated copper mineral...

One of the most prominent tectonic features of the Andes is the Central Andean Rotation Pattern (CARP), which is closely related to the Bolivian Orocline and characterized by paleomagnetically determined clockwise rotations in northern Chile and counterclockwise rotations in southern Peru (Arriagada et al., 2008). Along the Chilean margin, between...

In the Paleozoic, South America, South Africa and Antarctica were part of Gondwana. The Weddell Sea began to form at about 146 Ma, after rifting between the Antarctic Peninsula and southernmost South America. Much uncertainty still exists about the geometrical fit and subsequent drift history between Patagonia and Antarctica. Geophysical and geolog...

Magnetic fabrics recorded by continental sediments from the Central Andes were systematically measured for about 200 sites also studied for tectonic rotation. Most sediments of Cenozoic age are fine-grained red beds with a significant content of magnetite of volcanoclastic origine. 80 sites were collected in the Puna and Argentinan Andes, 40 sites...