Miocene sedimentary and tectonic evolution of the Andean Precordillera at 31°S, Argentina

Vergés, Jaume; Ramos, Emilio; Seward, Diane; Busquets, Pere Solà; Piñol, Ferrán Colombo

doi:10.1016/s0895-9811(01)00070-0

Cited by 31 publications

(54 citation statements)

References 22 publications

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“…2). Ma (Leveratto, 1976;Bercowski et al, 1986Bercowski et al, , 1993Vergés et al, 2001). The cross-sections shown in figure 7, the general cross-section of figure 8 and the structural map of figure 3 illustrate the geometry of the Punta Negra Anticline.…”

Section: Structure Of the Punta Negra Anticlinementioning

confidence: 98%

“…The Tertiary-Quaternary succession represents the infill of the Andean foreland basin (Ramos, 1999). It unconformably overlies the Palaeozoic succession (Alonso et al, 2005), with a slight palaeorelief at the unconformity surface (Vergés et al, 2001). It is a coarseningand thickening-upward succession deposited in fluvial and alluvial systems and its lowermost part is lower Miocene in age (Milana, 1991;Vergés et al, 2001;Milana et al, 2003).…”

Section: Structure Of the Punta Negra Anticlinementioning

confidence: 99%

“…The Neogene sequence comprises two formations. The oldest is the Albarracín Formation (Leveratto, 1968), up to 1400m thick, with an age ranging between 18 and 7 Ma in the western limb of the Punta Negra Anticline (Vergés et al, 2001). This formation is composed of finegrained terrigenous redbeds with interfingered pyroclastic rocks in the middle (Bercowski and Figueroa, 1987) and conglomeratic beds in the upper part (Fig.…”

Section: Structure Of the Punta Negra Anticlinementioning

confidence: 99%

“…The Albarracín Formation is a pregrowth unit (Vergés et al, 2001), but the basal contact of the Mogna formation displays a typical syntectonic unconformity. To the north of the San Juan River, the Mogna Formation lies with strong angular un- (Figs.…”

Section: Age and Significance Of The Punta Negra Anticlinementioning

confidence: 99%

“…This age indicates that these thrusts should be older than 16 Ma in contrast with the age of 5 Ma proposed by Zapata and Allmendinger (1996b) for the onset of the Andean deformation at the front of the Central Precordillera. The volcanic activity in the Punta Negra and Ullum areas has been documented from 18 Ma (pyroclastic flows in the Albarracín Basin) up to 7 Ma (Cerro Blanco intrusive) and is coetaneous with the deposition of the Albarracín Formation (Bercowski and Figueroa, 1987;Vergés et al, 2001;Bracco et al, 2011). Other arguments supporting a pre-Andean age for the abovementioned faults are the thickness changes of the Devonian succession in different sectors of the Punta Negra Anticlinorium.…”

Section: Age and Significance Of The Punta Negra Anticlinementioning

confidence: 99%

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Stratigraphy and structure of the Punta Negra Anticline. Implications on the structural evolution of the Argentine Precordillera

Alonso

Gallastegui

Fernández

et al. 2014

Journal of Iberian Geology

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The Punta Negra Anticline is a thrust-related fold, several kilometres wide, located at the front of the Argentine Central Precordillera. A stratigraphic succession including Ordovician, Silurian and Devonian rocks is exposed in its core, instead of a Devonian and Carboniferous succession as previously had been considered. The Punta Negra Anticline also involves a Tertiary sequence displaying syntectonic unconformities in the transition between the Albarracín and Mogna formations, recording the timing of thrusting and folding at the front of the Central Precordillera. This anticline folds thrust systems detached at the Silurian and Devonian shales, which we interpret as pre-Andean (Gondwanan) thrusts in this part of the Precordillera. The pre-Andean age of these thrusts is also consistent with their truncation by Tertiary subvolcanic intrusive bodies that predate the onset of the Andean deformation in the Punta Negra area. Moreover, the size and structural style of the Punta Negra Anticline, Andean in age, is in contrast with the other folds of the Central Precordillera, whose sizes do not exceed the hectometric scale and can be related to Gondwanan thrusting. This implies an Andean deeper thrust, probably detached at the bottom of the Cambrian succession.

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Section: Structure Of the Punta Negra Anticlinementioning

confidence: 98%

Section: Structure Of the Punta Negra Anticlinementioning

confidence: 99%

Section: Structure Of the Punta Negra Anticlinementioning

confidence: 99%

Section: Age and Significance Of The Punta Negra Anticlinementioning

confidence: 99%

Section: Age and Significance Of The Punta Negra Anticlinementioning

confidence: 99%

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Stratigraphy and structure of the Punta Negra Anticline. Implications on the structural evolution of the Argentine Precordillera

Alonso

Gallastegui

Fernández

et al. 2014

Journal of Iberian Geology

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Cenozoic sedimentation and exhumation of the foreland basin system preserved in the Precordillera thrust belt (31-32°S), southern central Andes, Argentina

Levina

Horton

Fuentes³

et al. 2014

Tectonics

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Andean retroarc compression associated with subduction and shallowing of the oceanic Nazca plate resulted in thin-skinned thrusting that partitioned and uplifted Cenozoic foreland basin fill in the Precordillera of west-central Argentina. Evolution of the central segment of the Precordillera fold-thrust belt is informed by new analyses of clastic nonmarine deposits now preserved in three intermontane regions between major east directed thrust faults. We focus on uppermost Oligocene-Miocene basin fill in the axial to frontal Precordillera at 31-32°S along the Río San Juan (Albarracín and Pachaco sections) and the flank of one of the leading thrust structures (Talacasto section). The three successions record hinterland construction of the Frontal Cordillera, regional arc volcanism, and initial exhumation of Precordillera thrust sheets. Provenance changes recorded by detrital zircon U-Pb age populations suggest that initial shortening in the Frontal Cordillera coincided with an early Miocene shift from eolian to fluvial accumulation in the adjacent foreland basin. Upward coarsening of fluvial deposits and increased proportions of Paleozoic clasts reflect cratonward (eastward) advance of deformation into the Precordillera and resultant structural fragmentation of the foreland basin into isolated intermontane segments. Apatite (U-Th)/He thermochronometry of basin fill constrains to 12-9 Ma the most probable age of uplift-induced exhumation and cooling of Precordillera thrust sheets. This apparent pulse of exhumation is evident in each succession, suggestive of rapid, large-scale exhumation by synchronous thrusting above a single décollement linking major structures of the Precordillera.

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Episodic Neogene Southward Growth of the Andean Subduction Orogen between 30°S and 40°S — Plate Motions, Mantle Flow, Climate, and Upper-Plate Structure

Vietor

Echtler

The Andes

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Miocene sedimentary and tectonic evolution of the Andean Precordillera at 31°S, Argentina

Cited by 31 publications

References 22 publications

Stratigraphy and structure of the Punta Negra Anticline. Implications on the structural evolution of the Argentine Precordillera

Stratigraphy and structure of the Punta Negra Anticline. Implications on the structural evolution of the Argentine Precordillera

Cenozoic sedimentation and exhumation of the foreland basin system preserved in the Precordillera thrust belt (31-32°S), southern central Andes, Argentina

Episodic Neogene Southward Growth of the Andean Subduction Orogen between 30°S and 40°S — Plate Motions, Mantle Flow, Climate, and Upper-Plate Structure

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