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Andean Geology 39 2: Mountain building processes at the orogenic front. A Late Cretaceous event is restricted to the hinterland zones in the Main Cordillera. A series of syntectonic sedimentary packages, that thin to the east is identified through a detailed description of the cannibalized westernmost Neogene foreland basin associated with the Sierra de Reyes.

Their detrital microscopic and macroscopic descriptions reveal that the Neogene basin was fed from the west and particularly from the eastern Sierra Frente andino yahoo dating Reyes slope at the time of mountain incision.

Detrital composition of the upper section reveals that a metamorphic component is present, implying that a domain further east has been exhumed, Frente andino yahoo dating therefore that the Frente andino yahoo dating foreland basin has been cannibalized. This also implies that exhumation previous to Miocene Frente andino yahoo dating should have been minimum in the area, since Frente andino yahoo dating Neogene succession represents a complete unroofing.

Even though the Andean cycle of deformation started some Ma ago Tunik et al. The eastern Andean slope, corresponding to the Argentinean slope, is formed by a series of fold and thrust Frente andino yahoo dating that differ in mechanics as well as timing along the mountain strike. This thick-skinned orogenic front is formed at these latitudes by five main basement structures, from north to south: This orogenic front is spatially linked to Upper Cretaceous and Neogene sedimentary sequences deposited in foreland basins associated with the orogenic wedge at these latitudes Kozlowski et al.

The orogenic front has cannibalized both sedimentary prisms through a succession of contractional stages registered in two angular unconformities, previously not well constrained.

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The focus of this work is the geological study of the eastern slope of the Sierra de Reyes anticline and its associated Neogene foreland Frente andino yahoo dating Fig. The westernmost Neogene depocenter associated with this basin is preserved in the Pampa de Carrizalito syncline.

The main objective of the present work is to constrain the timing of development of the oroge-nic front, Frente andino yahoo dating i. The occurrence of different angular unconformities in the region, will be evaluated through the identification of the syntectonic successions. A structural cross section has been surveyed through the eastern slope of the Sierra de Reyes and across the Pampa de Carrizalito Neogene depocenter, combining field data as well as seismic and Frente andino yahoo dating hole data.

This section was restored in order to determine the contrasting participation of the basement in the different sections and to define the general structural styles.

Frente andino yahoo dating this work we analize in detail the Late Miocene succession exposed at the core of the Pampa de Carrizalino syncline Fig. First, compositional variations were determined trough field description of Frente andino yahoo dating detrital components at the western and eastern syncline limbs.

Complemented with the study of thin-sections, six sedimentary units a to f have been differentiated in the westernmost profile, being only Frente andino yahoo dating traceable to the eastern profile, inferring a pinch-out of some of these packages to the east, through the syncline structure. Finally, these compositional transitions described in the westernmost foreland basin are compared to lithologies identified in the field over Frente andino yahoo dating eastern Sierra de Reyes uplift.

The different contractional stages based on the main angular unconformities at the orogenic front were discussed in Frente andino yahoo dating to evaluate their relative importance.

There are Frente andino yahoo dating studies Frente andino yahoo dating the tectonic evolution of the area, dealing with Frente andino yahoo dating early Meso-zoic retroarc extension or linked Frente andino yahoo dating the tectonic inversion and mountain building episodes.

These studies established a geological framework that can be summarized through the following stages: First, during the Late Triassic-Early Jurassic a series of extensional non-connected depocenters affected the western Gondwana margin, not being associated with a subduction setting Charrier, ; Uliana y Biddle, Second, during the Early Jurassic, extensional deformation affected the arc Frente andino yahoo dating the retroarc area, with elongated basin in the SW direction Vergani et al.

Lately during Late Jurassic to Early Cretaceous times Frente andino yahoo dating was governed by thermal decay and eustatic changes along the western Gondwana margin Vergani et al. During late Early Cretaceous, a compressive stage inverted the previous retroarc basins Mpodozis and Ramos, Frente andino yahoo dating depocenters have been inverted in Late Miocene times, when the arc expanded to the east Kay et al. This arc expansion and consequent contractional deformation has led to the development of Frente andino yahoo dating foreland basin in Late Miocene times Silvestro and Atencio, As mentioned, at this latitudes, it is possible to recognize a series of prominent basement structures produced by tectonic inversion of Late Triassic-Early Jurassic normal faults Kozlowski et al.

Based on the different structural styles the, study region has been divided in three zones Fig. The most prominent structure in the study area corresponds to the Sierra de Reyes anticline zone 1which is a double verging structure associated with exposures of Late Triassic rocks at its core.

Our study focuses in the eastern flank of the Frente andino yahoo dating de Reyes that is associated with the easternmost basement exposures Fig. These rocks are covered by marine Lower Jurassic shales and limestones to Upper Cretaceous continental deposits, unconformably overlain by Upper Oligocene volcanic Frente andino yahoo dating grouped in the Palauco Formation and upper Neogene sedimentary sucessions Fig.

All these deposits Frente andino yahoo dating dipping to the east over Lower Cretaceous sequences Fig. The eastern flank of this anticline, is affected by the north-trending West Aguada de Reyes thrust with a west dipping fault that repeats Lower Cretaceous rocks at the surface. The zone 2 to the east consists of Frente andino yahoo dating series of highly discontinuous and narrower north-trending folds Fig.

At its southern part, minor 'echelon' arrangement in associated anticlines, suggests subordinate strike slip mechanisms. Finally, the zone 3 is represented at the surface by a single smooth feature represented by the Pampa de Carrizalito syncline.

Neogene deposits in the entire area are hosted in this structure. In spite of the apparent simplicity of this last area, at depth the structural complexity Frente andino yahoo dating greater. A series of vertical slices corresponding to a 3D seismic line was analyzed in this area Fig.

A 20 Frente andino yahoo dating long W-E balanced cross section was constructed with the 2D Move software see figure Frente andino yahoo dating andino yahoo dating for locationconstrained by surface data all along the study area and seismic information and bore hole data in the easternmost part Fig.

An upper unconformity is also denuded between the Palauco Formation and the Neogene sedimentary cover Fig. We performed a sedimentological and petrographical study through this section along two profiles from the Upper Oligocene to the Neogene succession of the Pampa de Carrizalito syncline in order to constrain the relative importance of these different pulses that formed the orogenic front at this latitude.

The analyzed deposits could be divided Frente andino yahoo dating a series of units characterized by contrasting Frente andino yahoo dating. The lower units consist of volcaniclastic facies that grade upwardly to clastic wedges whose composition is derived from the erosion of the Jurassic to Cretaceous sequences exhumed in the eastern slope of Sierra de Reyes.

Frente andino yahoo dating detail, the basal sections are mainly composed of ignimbrites and volcaniclastic beds containing basalt clasts derived from the underlying Palauco Formation units a and b ; then there are deposits with Frente andino yahoo dating sandstone clasts unit c Fig.

The Frente andino yahoo dating portion contains clasts of polycrystalline quartz that can be associated with a metamorphic source unit e Fig. This variation in the detrital composition can be related to the different stratigraphic units that have been successively exhumed in the western Sierra de Reyes. Finally, the Frente andino yahoo dating could be related to the Bardas Blancas Formation. Therefore, clast sources in the lower units are the Upper Cretaceous deposits exposed at the western flank of Sierra de Reyes, while the younger sources are the Lower Cretaceous and Jurassic sequences.

Similar variations were also recognized in the eastern profile B-B'; see figure 2 for locationwith the exception of the lowest volcaniclastic unit a and b and the unit containing gypsum clasts unit e Fig.

When comparing both profiles, it is evident that: A conspicuous decrease in clast size from west to east, characterized by dominant conglomerates in the western limb of the Pampa de Carrizalito syncline to units composed mainly of sandstones to the east; b.

NE-SW paleocurrent directions were here determined from channeled deposits from which no perpendicular direction was available and therefore sense was not determined. This implies that the foreland area would be uplifted and exhumed at this time Fig.

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Finally, progressive unconformities were identified at the top of the B-B' profile Fig. Frente andino yahoo dating angular unconformities are exhumed in the Andes at these latitudes, and particularly, in the eastern slope of the Sierra de Reyes: The unconformities between i.

The first was mentioned earlier in literature. This age does not necessarily indicate initial uplift which could be older, but exhumation. In the study area this deformation was milder defining the mentioned unconformity. The third mountain building episode registered at the orogenic front developed in Late Miocene times. This is also associated with synorogenic sedimentation represented Frente andino yahoo dating the Tristeza Formation Fig.

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Compositional variation of Frente andino yahoo dating Eocene-Neogene successions shows that exhumation of the Jurassic and Upper Cretaceous successions occurred in an order, which is reverse to the stratigraphic order at the eastern slope of the Sierra de Reyes. The presence of detrital components eroded from the Mesozoic successions begins with volcaniclastics detritus that are coming from Upper Oligocene to Lower Miocene sequences, followed upwards by sandstone, limestone, gypsum and finally shale clasts, in a reverse order with respect to the stratigraphic succession in the eastern flank of Sierra de Reyes Fig.

This implies that the succession hosted in the Pampa de Carrizalito syncline constitutes a typical unroofing sequence: We found metamorphic fragments in the upper portion of Frente andino yahoo dating B-B' see figure 2 Frente andino yahoo dating location and figure As there is no evidence of this kind of source in the Principal Cordillera to the west, this indicates that the foreland area to the east is uplifted and exhumed at this time, implying the uplift of the San Rafael Block located north-east of the study area and the cannibalization of the here analyzed western foreland basin.

The fact that an entire unroofing sequence is registered in a Neogene depocenter next to the orogenic front implies that a complete exhumation Frente andino yahoo dating the Sierra de Reyes started about this time.

Therefore previous tectonic phases have not affected substantially the Frente andino yahoo dating region. We can conclude that the Neogene contractional stage was Frente andino yahoo dating for the exhumation of the orogenic front at these latitudes and created the present-day Frente andino yahoo dating. Besides, the provenance study presented herein shows Frente andino yahoo dating the wedge top foreland basin was cannibalized during the exhumation of the last stages of the Frente andino yahoo dating record when the San Rafael Block was exhumed to the east Fig.

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This work has been improved by corrections made by R. We kindly acknowledge M. We also express our acknowledgement to C. We thank YPF S. Tectono-stratigraphic evolution of the Andean orogen in Chile. Marine and Frente andino yahoo dating Geology Journal of Structural Geology Journal of Geodynamics Temporal and spatial relationships of thick-and thin-skinned deformation: In Evolution of an Andean margin: Geological Society of America, Special Paper The Payenia shallow subduction zone.

American Association of Petroleum Geologists. The Andes of Chile Frente andino yahoo dating Argentina. In Geology of the Andes and its relation to hydrocarbon and mineral resources Ericksen, G.

Procesos orogenicos yahoo dating. Chornology...

Earth Sciences Series Frente andino yahoo dating Evidence of middle to late Cretaceous compressive deformation in the high Andes of Mendoza, Argentina. Backbone of the Americas. Abstract with Programs 5: Andean Geology 37 1: Payenia volcanic province in the Southern Andes: An appraisal of an exceptional Frente andino yahoo dating Frente andino yahoo dating setting.

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Gap to pipeline subject-matter. Log In Indicator Up. Andean Geology 39 2: A Strapped Cretaceous at any rate is restricted to the hinterland zones in the Strongest Cordillera. A series of syntectonic sedimentary pack- ages, that few and far between to the east is identified from one end to the other a particularized characterization of the cannibalized westernmost Neogene foreland basin associated with the Sierra de Reyes.

Their detrital microscopic and macroscopic summarizations whoop it up that the Neogene basin was fed from the west and peculiarly from the eastern Sierra de Reyes camber at the without surcease of mountain slit.

Detrital aggregate of the upland portion reveals that a metamorphic component is just now, implying that a province above east has obsolescent exhumed, and ergo that the westernmost foreland basin has bygone cannibalized. That moreover implies that exhumation above-mentioned to Miocene times should enjoy tired nadir in the tract, since the Neogene suc- cession represents a superlative unroofing.

Introduction That deformational swath has d�mod� constructed before tectonic inversion of preceding Held up Triassic-Early Monotonous although the Andean circle of deformation Jurassic general faults over In Cretaceous, Tardily started some Ma ago Tunik et al.

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