Middle Eocene deformation–sedimentation in the Luracatao Valley: Tracking the beginning of the foreland basin of northwestern Argentina

Bosio, Patricio Payrola; Powell, Jaime Eduardo; Papa, Cecilia del; Hongn, Fernando

doi:10.1016/j.jsames.2009.06.002

Cited by 56 publications

(48 citation statements)

References 47 publications

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“…The study area is situated at ∼25°S, between the arid, internally drained orogenic Puna Plateau in the west and the undeformed Chaco Plain foreland basin in the east. Specifically, this region comprises the southern sectors of the Eastern Cordillera (EC), the Santa Barbara System (SBS), and the Sierras Pampeanas morphotectonic provinces (Figures 1 and 2b); here, we refer to the study area as a whole as the “Salta foreland.” At this latitude the Andean orogen was, until the middle Miocene, bordered by a contiguous foreland basin [e.g., Coutand et al , 2001; Hernández et al , 2005; Carrapa et al , 2008; Bosio et al , 2009]. Since that time, contractile inversion of the Cretaceous Salta Rift [e.g., Baldis et al , 1976; Rolleri , 1976; Bianucci and Homovec , 1982; Salfity , 1982; Allmendinger et al , 1983; Marquillas and Salfity , 1988; Mon and Salfity , 1995; Grier et al , 1991; Viramonte et al , 1999; Kley and Monaldi , 2002; Kley et al , 2005; Carrera et al , 2006; Carrera and Muñoz , 2008] has led to a patchwork of basement‐cored ranges and intervening intermontane basins that have experienced episodes of internal, or reduced external, drainage conditions [e.g., Malamud et al , 1996; Bookhagen et al , 2001; Salfity et al , 2004], but have been recaptured by rivers that are adjusted to the undeformed foreland (Figure 2a).…”

Section: Geologic Settingmentioning

confidence: 99%

“…The upper section of the Santa Bárbara Subgroup and coeval units farther west exhibit early signs of contractional deformation. For example, growth strata preserved along the present‐day Puna margin provide clear evidence for Eocene to Oligocene tectonism giving rise to foreland‐basin style sedimentation [e.g., Hongn et al , 2007; Bosio et al , 2009]. Proximal and distal units pertaining to this early stage of Andean evolution are well documented [e.g., Vergani and Starck , 1989a, 1989b; Salfity et al , 1993; Starck and Vergani , 1996].…”

Section: Geologic Settingmentioning

confidence: 99%

“… Reynolds et al , 2000]. The deformation history is only adequately resolved in the arid, well exposed western sector of the foreland, along the eastern flanks of the Puna Plateau [ Salfity et al , 2004; Deeken et al , 2006; Coutand et al , 2006; Hongn et al , 2007; Mortimer et al , 2007; Carrapa et al , 2008; Carrera and Muñoz , 2008; Bosio et al , 2009; Bywater‐Reyes et al , 2010].…”

Section: Introductionmentioning

confidence: 99%

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Neogene to Quaternary broken foreland formation and sedimentation dynamics in the Andes of NW Argentina (25°S)

Hain¹,

et al. 2011

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[1] The northwest Argentine Andes constitute a premier natural laboratory to assess the complex interactions between isolated uplifts, orographic precipitation gradients, and related erosion and sedimentation patterns. Here we present new stratigraphic observations and age information from intermontane basin sediments to elucidate the Neogene to Quaternary shortening history and associated sediment dynamics of the broken Salta foreland. This part of the Andean orogen, which comprises an array of basement-cored range uplifts, is located at ∼25°S and lies to the east of the arid intraorogenic Altiplano/Puna plateau. In the Salta foreland, spatially and temporally disparate range uplift along steeply dipping inherited faults has resulted in foreland compartmentalization with steep basin-tobasin precipitation gradients. Sediment architecture and facies associations record a three-phase (∼10, ∼5, and <2 Ma), east directed, yet unsystematic evolution of shortening, foreland fragmentation, and ensuing changes in precipitation and sediment transport. The provenance signatures of these deposits reflect the trapping of sediments in the intermontane basins of the Andean hinterland, as well as the evolution of a severed fluvial network. Present-day moisture supply to the hinterland is determined by range relief and basin elevation. The conspiring effects of range uplift and low rainfall help the entrapment and long-term storage of sediments, ultimately raising basin elevation in the hinterland, which may amplify aridification in the orogen interior. Citation: Hain, M. P.,

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Section: Geologic Settingmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Neogene to Quaternary broken foreland formation and sedimentation dynamics in the Andes of NW Argentina (25°S)

Hain¹,

et al. 2011

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“…The Santa Barbara subgroup is composed of early foreland basin sandstones, siltstones, limestones, and shales [ Marquillas et al , 2005]. Early foreland basin strata (Paleogene) were deposited on a mixed substratum within a continuous regional basin that was later divided into smaller isolated basins by intrabasin range uplift in the late Miocene [ Jordan and Alonso , 1987; Grier et al , 1991; Starck and Vergani , 1996; Bosio et al , 2009]. These strata are represented in the southern EC by four formations of the Eocene‐Pliocene Payogastilla group [ Grier and Dallmeyer , 1990].…”

Section: Introductionmentioning

confidence: 99%

“…These subbasins accumulated more than 3.5 km of sediment from Neocomian to Maastrichtian time [ Grier et al , 1991], and although Neogene deformation has overprinted the intricate geometry of the original rifts [ Kley and Monaldi , 2002], extensional structures striking perpendicular to Andean stresses have been preferentially reactivated as the major reverse fault bounded ranges of the modern Argentinean EC during the Cenozoic [ Carrera et al , 2006; Mon and Salfity , 1995]. Deformation within the Puna region and along its margins developed since the Paleogene, and significant thick‐skinned deformation has been active along the margins of the Puna province since the middle Eocene [ Bosio et al , 2009; Coutand et al , 2006; Carrapa et al , 2005; Deeken et al , 2006; Hongn et al , 2007; Riller et al , 2001]. Paleogene sedimentation in the southern central Andes occurred in a foreland basin that was regionally extensive, partially segmented by inherited structural highs and geographically complex [e.g., Carrapa et al , 2005; Carrapa and DeCelles , 2008; Hongn et al , 2007].…”

Section: Introductionmentioning

confidence: 99%

Patterns and timing of exhumation and deformation in the Eastern Cordillera of NW Argentina revealed by (U‐Th)/He thermochronology

2011

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[1] The Eastern Cordillera (EC) and related ranges of Bolivia and Argentina exhibit a wide variety of structural features, both thick and thin skinned, that make this region a prime area to study the evolution of these two contrasting styles. Using a combination of structural, geochronological, and thermochronological techniques, this study investigates how and in what order the various structures of the Argentinean EC from 25 to 26°S have developed during the Cenozoic. New mapping in the Angastaco area preserves one of the thickest Cenozoic stratigraphic sections and records a complex structural evolution during the Neogene, characterized by inversion of Cretaceous Salta Rift structures. Detrital zircon U-Pb geochronology combined with stratigraphic and structural features typical of synsedimentary deformation constrains the age of orgenic growth in the area to ∼14 Ma. Detrital apatite (U-Th)/He thermochronology on samples collected across the width of the southernmost EC at this latitude document an eastward younging of ages interpreted as the result of sequential eastward propagation of exhumation (and inferred deformation) from ∼14 to 3 Ma at a rate of ∼8.3 mm/a. Our data, when compared with existing data, show that the Puna Plateau of NW Argentina was exhuming and deforming at the same time as the EC and inter-Andean regions of Bolivia, suggesting that the deformation front connects along strike despite of the differences in structural style. Whereas the deformation front reached the sub-Andes of Bolivia by ∼10 Ma, deformation localized in the EC of NW Argentina until ∼4 Ma. Rates of propagation through the whole region seem to be quasi-uniform regardless of different structural styles.

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Thermochronologic Evidence for Late Eocene Andean Mountain Building at 30°S

et al. 2017

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The Andes between 28° and 30°S represent a transition between the Puna‐Altiplano Plateau and the Frontal/Principal Cordillera fold‐and‐thrust belts to the south. While significant early Cenozoic deformation documented in the Andean Plateau, deciphering the early episodes of deformation during Andean mountain building in the transition area is largely unstudied. Apatite fission track (AFT) and (U‐Th‐Sm)/He (AHe) thermochronology from a vertical and a horizontal transect reveal the exhumation history of the High Andes at 30°S, an area at the heart of this major transition. Interpretation of the age‐elevation profile, combined with inverse thermal modeling, indicates that the onset of rapid cooling was underway by ~35 Ma, followed by a significant decrease in cooling rate at ~30–25 Ma. AFT thermal models also reveal a second episode of rapid cooling in the early Miocene (~18 Ma) related to rock exhumation to its present position. Low exhumation between the rapid cooling events allowed for the development of a partial annealing zone. We interpret the observed Eocene rapid exhumation as the product of a previously unrecognized compressive event in this part of the Andes that reflects a southern extension of Eocene orogenesis recognized in the Puna/Altiplano. Renewed early‐Miocene exhumation indicates that the late Cenozoic compressional stresses responsible for the main phase of uplift of the South Central Andes also impacted the core of the range in this transitional sector. The major episode of Eocene exhumation suggests the creation of significant topographic relief in the High Andes earlier than previously thought.

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Middle Eocene deformation–sedimentation in the Luracatao Valley: Tracking the beginning of the foreland basin of northwestern Argentina

Cited by 56 publications

References 47 publications

Neogene to Quaternary broken foreland formation and sedimentation dynamics in the Andes of NW Argentina (25°S)

Neogene to Quaternary broken foreland formation and sedimentation dynamics in the Andes of NW Argentina (25°S)

Patterns and timing of exhumation and deformation in the Eastern Cordillera of NW Argentina revealed by (U‐Th)/He thermochronology

Thermochronologic Evidence for Late Eocene Andean Mountain Building at 30°S

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