Miocene magmatism and tectonics of the easternmost sector of the Calama-Olacapato-El Toro fault system in Central Andes at  24 S: Insights into the evolution of the Eastern Cordillera

Mazzuoli, R.; Vezzoli, Luigina; Omarini, R.; Acocella, Valerio; Gioncada, Anna; Matteini, Mássimo; Dini, Andréa; Guillou, Hervé; Hauser, Natalia; Uttini, Andrea; Scaillet, Stéphane

doi:10.1130/b26109.1

Cited by 45 publications

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“…1; Matteini et al 2005;Mazzuoli et al 2008) formed about 300 km to the E of the Miocene-Quaternary volcanic arc (Western Cordillera; Fig. 1a and b) along the NW-striking Calama-OlacapatoEl Toro transverse fault system (Allmendinger et al 1983;Riller et al 2001;Matteini et al 2002a, b;Riller and Oncken 2003;Acocella et al 2007).…”

Section: Geological Settingmentioning

confidence: 96%

“…3). Its overall thickness is~70 m, and the K/Ar age is 11.12±0.17 Ma (Mazzuoli et al 2008). Lava and pumice clasts show a homogeneous andesitic (SiO 2 59.8 wt.%) composition and phenocrysts population (amphibole and plagioclase).…”

Section: Geological Settingmentioning

confidence: 99%

“…Seven distinctive lithostratigraphic units have been mapped (Fig. 2) and can be assigned to two magmatic phases in the geologic history of the BAT igneous complex Mazzuoli et al 2008). The older magmatic phase (14-12 Ma) comprises the Las Burras intrusion (Las Burras member, 14.2 Ma) and the oldest volcanic unit (Puerta Tastil member, 12.8 Ma).…”

Section: Geological Settingmentioning

confidence: 99%

“…2 Sketch of the stratigraphic and geometric relationships of the BAT volcanic succession at 7-6 Ma along a NW-SE transect between the Almagro range and the El Toro basin. Ages are from Mazzuoli et al (2008) fragments of the same composition up to 10 mm across. The monomictic andesitic lobe breccia bed shows irregular upper and lower contacts (Fig.…”

Section: Monomictic Andesitic Lobe Brecciamentioning

confidence: 99%

“…These examples occur at three stratigraphic levels of the Miocene (14-6 Ma) Las Burras-Almagro-El Toro igneous complex Mazzuoli et al 2008). In the volcanic sequences of this igneous complex there are several andesitic volcaniclastic deposits that display evidence of subaqueous deposition and associated non-explosive magma fragmentation.…”

Section: Introductionmentioning

confidence: 98%

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Non-explosive magma–water interaction in a continental setting: Miocene examples from the Eastern Cordillera (central Andes; NW Argentina)

et al. 2008

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The Middle-Upper Miocene Las Burras-AlmagroEl Toro (BAT) igneous complex within the Eastern Cordillera of the central Andes (∼24°S; NW Argentina) has revealed evidence of non-explosive interaction of andesitic magma with water or wet clastic sediments in a continental setting, including peperite generation. We describe and interpret lithofacies and emplacement mechanisms in three case studies. The Las Cuevas member (11.8 Ma) comprises facies related to: (i) andesite extruded in a subaqueous setting and generating lobe-hyaloclastite lava; and (ii) marginal parts of subaerial andesite lava dome(s) in contact with surface water, comprising fluidal lava lobes, hyaloclastite, and juvenile clasts with glassy rims. The Lampazar member (7.8 Ma) is represented by a syn-volcanic andesite intrusion and related peperite that formed within unconsolidated, water-saturated, coarse-grained volcaniclastic conglomerate and breccia. The andesite intrusion is finger-shaped and grades into intrusive pillows. Pillows are up to 2 m wide, tightly packed near the intrusion fingers, and gradually become dispersed in the host sediment ≥50 m from the parent intrusion. The Almagro A member (7.2 Ma) shows evidence of mingling between water-saturated, coarsegrained, volcaniclastic alluvial breccia and intruding andesite magma. The resulting intrusive pillows are characterized by ellipsoidal and tubular shape and concentric structure. The high-level penetration of magma in this coarse sediment was unconfined and irregular. Magma was detached in apophyses and lobes with sharp contacts and fluidal shapes, and without quench fragmentation and formation of a hyaloclastite envelope. The presence of peperite and magma-water contact facies in the BAT volcanic sequence indicates the possible availability of water in the system between 11-7 Ma and suggests a depositional setting in this part of the foreland basin of the central Andes characterized by an overall topographically low coastal floodplain that included extensive wetlands.

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Section: Geological Settingmentioning

confidence: 96%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Monomictic Andesitic Lobe Brecciamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Non-explosive magma–water interaction in a continental setting: Miocene examples from the Eastern Cordillera (central Andes; NW Argentina)

et al. 2008

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Silicic Dome Volcanic Complexes

Coira

Cisterna

2020

Springer Earth System Sciences

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Perpectives on Integrated Solid Earth Sciences

Cloetingh¹,

Negendank

2009

New Frontiers in Integrated Solid Earth Sciences

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During the last decades the Earth sciences are rapidly changing from largely descriptive to process-oriented disciplines that aim at quantitative models for the reconstruction and forecasting of the complex processes in the solid Earth. This includes prediction in the sense of forecasting the future behaviour of geologic systems, but also the prediction of geologic patterns that exist now in the subsurface as frozen evidence of the past. Both ways of prediction are highly relevant for the basic needs of humanity: supply of water and resources, protection against natural hazards and control on the environmental degradation of the Earth.Intensive utilization of the human habitat carries largely unknown risks of and makes us increasingly vulnerable. Human use of the outermost solid Earth intensifies at a rapid pace. There is an urgent need for scientifically advanced "geo-prediction systems" that can accurately locate subsurface resources and forecast timing and magnitude of earthquakes, volcanic eruptions and land subsidence (some of those being man induced). The design of such systems is a major multidisciplinary scientific challenge. Prediction of solidEarth processes also provides important constraints for predictions in oceanographic and atmospheric sciences and climate variability.The quantitative understanding of the Earth has made significant progress in the last few decades. Important ingredients in this process have been the advances made in seismological methods to obtain S.A.P.L. Cloetingh ( ) ISES, Faculty of Earth and Life Sciences, VU University Amsterdam, Amsterdam, The Netherlands e-mail: sierd.cloetingh@falw.vu.nl information on the 3D structure of the mantle and the lithosphere, in the quantitative understanding of the lithospheric scale processes as well as the recognition of the key role of quantitative sedimentary basin analysis in connecting temporal and spatial evolution of the system Earth recorded in their sedimentary fill. Similar breakthroughs have been made in the spatial resolution of the structural controls on lithosphere and (de)formation processes and its architecture by 3D seismic imaging. Earth-oriented space research is increasingly directed towards obtaining a higher resolution in monitoring vertical motions at the Earth's surface. Modelling of dynamic topography and landform evolution is reaching the phase where a full coupling can be made with studies of sediment supply and erosion in the sedimentary basins for different spatial and temporal scales.Quantitative understanding of the transfer of mass at the surface by erosion and deposition as well as their feed back with crustal and subcrustal dynamics presents a new frontier in modern Earth sciences. This research bridges current approaches separately addressing high resolution time scales for a limited near surface record and the long term and large scale approaches characteristic so far for the lithosphere and basin-wide studies. The essential step towards a 4D approach (in space and time) is a direct response to the...

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Miocene magmatism and tectonics of the easternmost sector of the Calama-Olacapato-El Toro fault system in Central Andes at 24 S: Insights into the evolution of the Eastern Cordillera

Cited by 45 publications

References 84 publications

Non-explosive magma–water interaction in a continental setting: Miocene examples from the Eastern Cordillera (central Andes; NW Argentina)

Non-explosive magma–water interaction in a continental setting: Miocene examples from the Eastern Cordillera (central Andes; NW Argentina)

Silicic Dome Volcanic Complexes

Perpectives on Integrated Solid Earth Sciences

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