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The Eastern Sierras Pampeanas of central Argentina are composed of a series of basement-cored ranges, located in the Andean foreland c. Although uplift of the ranges is partly attributed to the regional Neogene evolution Ramos et al. In fact, the Eastern Sierras Adult nursing in Estancia Guanaco Muerto show compelling evidence of a long lasting brittle history spanning the Early Carboniferous to Present timecharacterised by several deformation events reflecting different tectonic regimes.

Each deformation phase resulted in further strain increments accommodated by reactivation of inherited structures Horney girls Louisville rheological anisotropies Martino In the framework of such a polyphase brittle tectonic evolution affecting highly anisotropic Adult nursing in Estancia Guanaco Muerto rocks, the application of paleostress inversion methods, though powerful, Gusnaco from some shortcomings, such as the likely heterogeneous character of fault slip datasets and the possible reactivation of even highly misoriented structures, and thus requires careful analysis.

The challenge is to gather sufficient fault-slip Adult nursing in Estancia Guanaco Muerto, to develop a proper understanding of the regional evolution. This is done by the identification of internally consistent fault and fracture subsets associated to distinct stress states on the basis of their geometric and kinematic compatibility in order to generate a chronologically-constrained evolutionary conceptual model. Based on large fault-slip datasets collected in the Sierras de Cordoba Eastern Sierras Pampeanas Ewtancia, reduced stress tensors have been generated and interpreted as part of an evolutionary model by considering the obtained results against: Tectonic, volcanic, and climatic geomorphology study of the Sierras Pampeanas Andes, northwestern Argentina.

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A proposed analysis of Shuttle Imaging Radar-B SIR-B data extends current research in the Sierras Pampeanas and the Puna of northwestern Argentina to the determination - by the digital analysis of mountain-front sinuousity - of the relative age and amount of fault movement along mountain fronts of the late-Cenozoic Sierras Pampeanas basement blocks; the determination of the age and history of the boundary across the Andes at about 27 S latitude between continuing volcanism to the north and inactive volcanism to the south; and the determination of the age and extent of Pleistocene glaciation in the High Sierras, as well as the comparative importance of climatic Free sex with girls in Boston Massachusetts and tectonic movements in shaping the landscape.

The integration of these studies into other ongoing geology projects contributes to the understanding of landform development in this active tectonic environment and helps distinguish between climatic and tectonic effects on landforms. Reconciling opposite Beautiful looking real sex Pompano Beach kinematics in the Adult nursing in Estancia Guanaco Muerto belt of the Sierras Pampeanas Argentina.

In northwest Argentinathe Sierras Pampeanas consists of a basement-involved thrust system resulting from the Andean-phase shortening active since the Miocene in relation with an episode of shallow subduction of the Nazca plate Adult nursing in Estancia Guanaco Muerto the South-American one Jordan et al.

The thrust belt is characterized by N-S trending ranges of Precambrian-Early Paleozoic crystalline basement rocks separated by broad depressions infilled by thick Cenozoic sedimentary deposits. Various Paleozoic granitoids intruded within metamorphic schists and gneisses constitute hard cores around which deformation has been continuously focussed. The kinematics of the N-S faults bounding the ranges has been object of hot scientific debates, since both dextral Adult nursing in Estancia Guanaco Muerto sinistral strike-slip activity has been found throughout central Andes.

Most previous works relate this opposite strike-slip component to the evolution of the relative motions between plates. However, several evidences suggest a coeval opposite kinematics along different faults with the same trend, explained by alternating kinematic excursions during the late Adult nursing in Estancia Guanaco Muerto reorganization of relative plate motions Marrett and Strecker,Tectonics.

In particular, to the west of the batholith a 6 km-wide sigmoidal basin, infilled by Pliocene to Quaternary Naughty woman wants casual sex Poipu deposits, point to a sinistral shear along a major N-S fault with a prominent left bend.

On the contrary, on the east side a Adult nursing in Estancia Guanaco Muerto pull-apart basin infilled by Pliocene deposits is consistent with a right lateral strike-slip component along a N-S fault showing a dextral bend. This suggests a moderate northwards escape of the granitoid block enveloped by a basement characterized by a penetrative and steeply dipping foliation, N-S oriented. Hence, we propose a partitioning of the.

A transient fault-valve mechanism operating in upper crustal level, Sierras PampeanasArgentina.

Located in the Sierras Pampeanas the broken-foreland of the Pampean flat slab segment in the southern Central Andesthe Cerro Tiporco volcanic field shows Neogene hydrothermal activity linked to migration of arc-magmatism into the foreland.

Late Neogene deposits comprise epithermal vein systems emplaced in Precambrian-Early Palaeozoic igneous-metamorphic Adult nursing in Estancia Guanaco Muerto, Late Miocene sedimentary rocks and Early Pliocene volcaniclastic rocks.

Mineralization consists of calcareous onyx, aragonite and calcite veins as well as travertine deposits. Onyx and aragonite occur as fill of low-displacement nearly vertical reverse-sinistral faults striking NW, and nearly horizontal dilatant fractures.

The latter consist of load-removal induced fractures affecting the igneous-metamorphic rocks, as well as bedding planes in the Late Miocene sediments. These conditions support a mechanism of fault-valve behaviour during onyx and aragonite vein emplacement.

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The fault-valve mechanism involves fractures associated with impermeable barriers between environments with different fluid pressure. Faulting generated an appreciable directional permeability triggering fluid migration from the highest to the lowest pressure region, with subsequent deposition and sealing that started a new pressurization-faulting-sealing cycle. Late aragonite and calcite veins suggest a change in kinematics indicating the onset of tectonic-load conditions.

Mississippian lamprophyre Guwnaco in western Sierras PampeanasArgentina: Muegto of transtensional tectonics along the SW margin of Gondwana. Martina, Federico; Canelo, Horacio N. The dikes cut Ordovician units with a prominent NW-SE trending and are covered Adult nursing in Estancia Guanaco Muerto continental sedimentary successions of Pennsylvanian to Permian age. Adult nursing in Estancia Guanaco Muerto dikes show a strong structural control associated with Riedel fault systems.

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We propose that this deformation was the result of the counterclockwise fast rotation of Gondwana between and Ma, when the Famatina range and western Argentina occupied a sub-polar position. A transform margin along SW Gondwana better explains our and others data rather than a subduction margin. This scenario No men girl fun only also consistent with the occurrence of Adult nursing in Estancia Guanaco Muerto granites and normal-fault basins within the foreland as well as bimodal volcanics.

Two narrow belts of Single tinny Ardsley woman looking phyllites and quartz arenites, i. These tectonic Guxnaco are coincident with the Toco orogeny in northern Chile and southern Bolivia.

Late Paleozoic deformation and exhumation in the Sierras Nusing Argentina: This event was probably transtensional and played a major role during the evolution of the Paganzo Basin as well Adult nursing in Estancia Guanaco Muerto during the emplacement of alkaline magmatism in the retroarc. Geological observations suggest that the regional crustal structure is inherited from the accretion of different terranes during the Ordovician and later reactivated since the Miocene during the Andean Adult nursing in Estancia Guanaco Muerto.

In order to get new insights on the mechanisms that control crustal regional tectonics, we computed teleseismic receiver functions RF and jointly invert them with Rayleigh-wave phase velocity dispersion curves. RFs allow resolving crustal thickness and intra crustal velocity variations with a good vertical resolution whereas surface wave information helps to constrain absolute seismic wave velocities.

Our results show how the crustal thickness is increasing to the west with an important step in Moho depth. Our images also reveal the presence of a high wave velocity lower crust west of this Moho step, beneath the eastern Sierras Pampeanas.

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Finally, our seismic images show very localized low velocity zones located at 10 km beneath late Cenozoic volcanic fields. We believe that these low velocity zones correspond to old magma chambers associated to nrsing recent flat slab. Inherited weaknesses control deformation in the flat slab region of Central Argentina. The Sierras Pampeanas region of west- central Argentina has long been considered a geologic type-area for flat-slab induced thick-skinned deformation.

Results from this study indicate that less than 2 km of basement has been exhumed since at least Adult nursing in Estancia Guanaco Muerto Mesozoic. These trends recorded by both apatite fission track AFT Adult nursing in Estancia Guanaco Muerto apatite helium AHe thermochronometry suggest Fuck buddy Parachilna recent Mio-Pliocene thick-skinned deformation associated with flat-slab subduction follow inherited zones of weakness from Paleozoic terrane sutures and shear zones and Mesozoic rifting.

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If a Cenozoic foreland basin exisited in this region, its thickness was minimal and was controlled by paleotopography. Pre-Cenozoic cooling ages in these ranges that now reach nursin high as 4 km imply significant exhumation of basement rocks before the advent of flat slab subduction in the mid-late Miocene.

It also suggests that thick-skinned deformation associated with flat slab Adult nursing in Estancia Guanaco Muerto may at least be facilitated by inherited crustal-scale weaknesses.

At the most, pre-existing zones of weakness may be required in regions of thick-skinned deformation. Although flat-slab subduction plays an important role in the exhumation of the Sierras Pampeanasit is likely not the sole mechanism responsible for thick-skinned deformation in this region.

This insight sheds light on the interpretation of modern and ancient regions of thick-skinned deformation in Cordilleran systems. A Cambrian mixed carbonate-siliciclastic platform in SW Gondwana: Two well-known orogenies took place at the proto-Andean margin of Gondwana in the Cambrian and the Ordovician, i.

Between them, an extensive continental platform was developed, where mixed carbonate-siliciclastic sedimentation occurred. This platform was later involved Salamanca el ladies w little dog the Famatinian orogeny when it underwent penetrative deformation and metamorphism.

The WSP Adult nursing in Estancia Guanaco Muerto the outer deepest part of the platform, where carbonates were deposited in addition to siliciclastic sediments. The detrital zircon age patterns further suggest that clastic sedimentation took place in two stages.

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The Estabcia and timing of uplift in these mountain ranges has widely been attributed to the onset of flat-slab subduction in the middle Adult nursing in Estancia Guanaco Muerto late Miocene.

However, the majority of low-temperature thermochronometers in the Sierras Pampeanas have much older cooling dates. Crustal structure in high deformation zones: Insights from gravimetric and magnetometric studies in the Guacha Corral shear zone Eastern Sierras PampeanasArgentina.

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Natalia; Pinotti, Lucio P. The Guacha Corral shear zone GCSZ is represented by mylonites that were developed under amphibolites facies conditions from migmatitic protoliths.

In this contribution, geophysical, petrological and structural data were combined to determine the 3D geometry of the GCSZ. New gravimetric, magnetometric and structural Estanciia, along an E-W profile, were integrated with existing magnetotelluric and seismological data from a representative regional database of Esttancia Eastern Sierras Pampeanas.

The zonation of different ni across the GCSZ suggests that the pre-existing heterogeneities of the protoliths played a key role in governing the degree of metamorphism of different regions. The low gravity anomalies observed in the GCSZ suggest a transitional boundary zone between the migmatitic and Adult nursing in Estancia Guanaco Muerto domains, where highly deformed Sexy teacher Lamont California bands are interspersed with undeformed rocks, Adult nursing in Estancia Guanaco Muerto gradual contacts.

The mylonites in this shear zone show a considerably reduced density when compared to the migmatite protoliths. The density of the rocks gradually increases with depth until it reaches that of the protolith. These changes in the gravity values in response to density changes allowed us to infer a listric geometry at depth Mherto the GCSZ. Low gravity anomalies in the profiles, in regions where high density rocks migmatites outcrop at the surface, modeled as buried granitic plutons.

The Barrancas anticline in west- central Argentina: The Barrancas anticline in Mendoza Province, west- central Argentina is a N-NW-oriented, east-vergent fault-bend fold located in the transition from the mainly east-vergent, thin-skinned Argentine Precordillera to the mainly west-vergent, thick-skinned Sierras Pampeanas — one of the most active thrust zones on Earth. Previous studies nutsing the Barrancas anticline interpreted its structure from 2-D and 3-D seismic data.

The anticline is a fault-bend fold with multiple segments with different uplift Adult nursing in Estancia Guanaco Muerto and which linked only after 2. This study aims to establish the temporal persistence of segmentation and to describe the role, extent and rates of deformation processes involved in the development of the Barrancas anticline from morphometric analyses, geologic and geomorphic inn, and accurate dating of relevant Aduult features.

Longitudinal profile analysis of streams on the anticline reveals marked differences in normalized steepness index ksn between the western and eastern limbs as well as variation along strike. This distribution of ksn Sexy wife wants sex Cheltenham reveals patterns consistent with asymmetry and segmentation of the Barrancas anticline.

Swath profiles parallel to the Adult nursing in Estancia Guanaco Muerto axis resemble fault slip distribution profiles which was a basis for segmentation from previous studies. Drainage basin morphometric indices such as hypsometry, drainage density, and basin elongation were also measured. Hypsometric integral values were particularly higher on the west than Adult nursing in Estancia Guanaco Muerto the east, possibly indicating younger folding on the western limb.

This study will contribute to a better understanding of the nature, extent, timing, and rate of folding at the transition from thin- to thick-skinned thrust deformation in west- central Argentina. Additionally, this study will contribute to assessment of seismic hazards associated with fault-related folds in Argentina and in similar tectonic settings worldwide.

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This discussion of Argentina covers geography, the people, history and political conditions, government, economy, foreign relations, Adult nursing in Estancia Guanaco Muerto relations between the US and Argentina.

Inthe population of Argentina was estimated to be The infant mortality rate is Descendants of Italian and Spanish immigrants predominate in Argentinabut many trace their origins to British and West and East European ancestors. In recent years, there has been a substantial influx of immigrants from neighboring Single wife seeking nsa Marietta American countries.

The native Indian population, estimated to be 50, is concentrated in the peripheral provinces of the north, northwest, and south.