Cretaceous and Eocene Rapid Cooling Phases in the Southern Andes (36°–37°S): Insights From Low‐Temperature Thermochronology, U‐Pb Geochronology, and Inverse Thermal Modeling From Domuyo Area, Argentina

Galetto, Antonella; Georgieva, Viktoria; García, Víctor H.; Zattin, Massımılıano; Sobel, Edward R.; Glodny, Johannes; Bordese, Sofía; Arzadún, Guadalupe; Bechis, Florencia; Caselli, Alberto Tomás; Becchio, Raúl

doi:10.1029/2020tc006415

Cited by 18 publications

(21 citation statements)

References 137 publications

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“…(2017) and Galetto et al. (2021). (U‐Th‐Sm)/He ages were calculated following the equations in Meesters and Dunai (2005) using the He, U, Th, and Sm abundances, an alpha‐ejection correction factor (Ft) (Farley et al., 1996; Ketcham et al., 2011) obtained from the measured grain dimensions, and the alpha‐particle stopping distance from Ketcham et al.…”

Section: Methodsmentioning

confidence: 96%

“…The aliquots were then transferred to the German Research Center for Geosciences (GFZ) Potsdam for analysis of U, Th, and Sm abundances by isotope dilution. The grains were spiked with 235 U, 230 Th, and 149 Sm, dissolved, and then analyzed on a Thermo Element 2 XR ICP-MS. Additional analytical data are provided in Zhou et al (2017) and Galetto et al (2021). (U-Th-Sm)/He ages were calculated following the equations in Meesters and Dunai (2005) using the He, U, Th, and Sm abundances, an alpha-ejection correction factor (Ft) (Farley et al, 1996;Ketcham et al, 2011) obtained from the measured grain dimensions, and the alpha-particle stopping distance from Ketcham et al (2011).…”

Section: Single-grain (U-th-sm)/he Thermochronologymentioning

confidence: 99%

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Constraining Andean Propagation of Exhumation at the Limit of the Eastern Cordillera, NW Argentina, Using Low‐Temperature Thermochronology in a Structural Context

et al. 2022

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Within the Central Andes of NW Argentina, the spatiotemporal distribution and style of deformation is strongly influenced by pre‐Cenozoic heterogeneities, mostly related to the Salta rift extension in the Cretaceous. At the enigmatic junction of the thin‐skinned Subandean belt and the thick‐skinned Santa Barbara System, the Tilcara Range and adjacent San Lucas block, located within the Eastern Cordillera, show thermochronological and field evidence of multiple exhumation events. Mesozoic (140‐115 Ma), pre‐Andean exhumation of basement highs is constrained by unconformities between basement and syn‐rift strata, as well as zircon (U‐Th‐Sm)/He cooling ages. Cenozoic Andean exhumation is quantified by apatite (U‐Th‐Sm)/He and fission track cooling ages, which were reset between the Late Cretaceous and Miocene. These data show that the westernmost Tilcara Range began exhuming in the late Oligocene‐early Miocene (26‐16 Ma), after which exhumation propagated to the border of the Eastern Cordillera in the middle Miocene (22‐10 Ma). The onset of rapid exhumation in the San Lucas block, which is located east of the Tilcara Range, occurred in the late Miocene (10‐8 Ma) in its western part, and in the late Miocene‐early Pliocene (6‐4 Ma) in its eastern part. Internal deformation of the San Lucas block, disturbing zircon (U‐Th‐Sm)/He and apatite fission track age patterns, predates propagation of rapid exhumation. The here presented low‐temperature thermochronology data set thus quantifies the multi‐phase exhumation history of the Eastern Cordillera of NW Argentina and constrains the timing of Andean propagation of exhumation within the Eastern Cordillera and the adjacent structural transition zone.

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Section: Methodsmentioning

confidence: 96%

Section: Single-grain (U-th-sm)/he Thermochronologymentioning

confidence: 99%

Constraining Andean Propagation of Exhumation at the Limit of the Eastern Cordillera, NW Argentina, Using Low‐Temperature Thermochronology in a Structural Context

et al. 2022

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“…Seventeen zircon and three apatite samples were analyzed using the (U‐Th‐Sm/He) (ZHe and AHe, respectively) methods at Universitaet Potsdam (alphachron) and GFZ‐Potsdam (ICP‐MS) following the methodology of Galetto et al. (2021) and Zhou et al. (2017).…”

Section: Strategy and Methodsmentioning

confidence: 99%

“…Methodology followed Parra et al (2009). Seventeen zircon and three apatite samples were analyzed using the (U-Th-Sm/He) (ZHe and AHe, respectively) methods at Universitaet Potsdam (alphachron) and GFZ-Potsdam (ICP-MS) following the methodology of Galetto et al (2021) and Zhou et al (2017). Eleven apatite fission track (AFT) samples were analyzed at the Universitaet Potsdam by ERS using the external detector method following the methods outlined in Sobel and Strecker (2003).…”

Section: Thermochronological Analysesmentioning

confidence: 99%

The Timing of Collision Between Asia and the West Burma Terrane, and the Development of the Indo‐Burman Ranges

Najman

Sobel

Millar³

et al. 2022

Tectonics

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The West Burma Terrane (WBT) is a small terrane bounded to the east by the Asian Sibumasu Block and to the west by the Indo‐Burman Ranges (IBR), the latter being an exhumed accretionary prism that formed during subduction of Indian oceanic lithosphere beneath Asia. Understanding the geological history of the WBT is important for reconstruction of the closure history of the Tethys Ocean and India‐Asia collision. Currently there are major discrepancies in the proposed timings of collision between the WBT with both India and Asia; whether the WBT collided with India or Asia first is debated, and proposed timings of collisions stretch from the Mesozoic to the Cenozoic. We undertook a multi‐technique provenance study involving petrography, detrital zircon U‐Pb and Hf analyses, rutile U‐Pb analyses and Sr‐Nd bulk rock analyses on sediments of the Central Myanmar Basins of the WBT. We determined that the first arrival of Asian material into the basin occurred after the earliest late Eocene and by the early Oligocene, thus placing a minimum constraint on the timing of WBT‐Asia collision. Our low temperature thermochronological study of the IBR records two periods of exhumation, in the early‐middle Eocene, and at the Oligo‐Miocene boundary. The Eocene event may be associated with the collision of the WBT with India. The later event at the Oligo‐Miocene boundary may be associated with changes in wedge dynamics resulting from increased sediment supply to the system; however a number of other possible causes provide equally plausible explanations for both events.

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“…Such a high geothermal gradient suggests that the intrusive rocks were cooling down and exhuming at the same time. The lower geothermal gradients of ~51 °C km −1 (Sigismondi, 2013;Sigismondi & Ramos, 2009a,b;see Galetto et al 2021) could be reflecting the pre- Andean tectonic scenario in the modern easternmost region of the Neuquén Basin, which was not affected by Andean deformation (Galetto et al 2021).…”

Section: C Cooling History and Exhumation Of The Late Cretaceous And ...mentioning

confidence: 99%

Emplacement conditions and exhumation of the Varvarco Tonalite and associated plutons from the Cordillera del Viento, Southern Central Andes

et al. 2022

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During the Late Cretaceous Andean orogeny, the compressive deformation associated with the shallowing of the subducting slab caused the development of the arc-related igneous rocks known as the Naunauco Belt. This study presents petrographic, mineralogical and anisotropy of magnetic susceptibility data for the Varvarco Intrusives (the Varvarco Tonalite, Butalón Tonalite and Radales Aplite), which crop out in the Cordillera del Viento, Neuquén Province, Argentina. The assembly of plutons was formed by mafic magma episodic injection. Amphibole and biotite compositions suggest that the Varvarco Tonalite is related to calc-alkaline, I-type magmas, typical of subduction environments. Different geothermobarometers based on amphibole and plagioclase compositions for the Varvarco Tonalite suggest shallow emplacement conditions (∼2–3 kbar, equivalent to ∼12 km depth). Apatite fission-track analyses give exhumation ages of 67.5 ± 8 Ma for the Varvarco Tonalite and 50.3 ± 5.9 Ma for the Butalón Tonalite. A calculated continuous fast exhumation rate of at least 330 °C Ma−1 is consistent with the shallow emplacement conditions, textural data and geobarometric estimations. In agreement with the thermal profile, the magmatic system was exhumed by ∼12 km within c. 2.1 Ma implying a geothermal gradient of ∼62.5 °C km−1. The last step of exhumation occurred between ∼65.3 and 56.9 Ma. The magmatic fabrics observed in the studied plutons reflect mostly magma chamber processes. The Varvarco Intrusives represent satellite calc-alkaline plutons of the North Patagonian Batholith which were emplaced syn- to post-tectonically with respect to a major deformation stage of the Southern Central Andes.

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Cretaceous and Eocene Rapid Cooling Phases in the Southern Andes (36°–37°S): Insights From Low‐Temperature Thermochronology, U‐Pb Geochronology, and Inverse Thermal Modeling From Domuyo Area, Argentina

Cited by 18 publications

References 137 publications

Constraining Andean Propagation of Exhumation at the Limit of the Eastern Cordillera, NW Argentina, Using Low‐Temperature Thermochronology in a Structural Context

Constraining Andean Propagation of Exhumation at the Limit of the Eastern Cordillera, NW Argentina, Using Low‐Temperature Thermochronology in a Structural Context

The Timing of Collision Between Asia and the West Burma Terrane, and the Development of the Indo‐Burman Ranges

Emplacement conditions and exhumation of the Varvarco Tonalite and associated plutons from the Cordillera del Viento, Southern Central Andes

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