Thermochronological constraints on the Cambrian to recent geological evolution of the Argentina passive continental margin

Kollenz, Sebastian; Glasmacher, Ulrich A.; Rossello, Eduardo A.; Stöckli, Daniel F.; Schad, Sabrina; Pereyra, R.

doi:10.1016/j.tecto.2016.11.019

Cited by 18 publications

(9 citation statements)

References 83 publications

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“…This uplift, however, was not homogeneous along the coast. The area studied in this work presents a rather modest topography, mostly comprising elevations below 500 m. Recent research on such areas have revealed more detailed prerift exhumations stories (Hueck et al, ; Kollenz et al, ; Oliveira et al, ). The study area has not been the subject of detailed low‐temperature research but is included by Karl et al () in a crustal block characterized by old zircon (U‐Th)/He and fission track ages, limited by transverse SE‐NW fault systems.…”

Section: Geological Settingmentioning

confidence: 95%

“…Most thermochronologic studies have focused on these areas, recognizing the effect of rift and postrift exhumation (Cogné et al, , ; Franco‐Magalhães et al, , ; Hackspacher et al, , ; Hiruma et al, ; Jelinek et al, ; Ribeiro et al, ; Tello Saenz et al, ). The prerift evolution, however, is better detailed in areas with less dramatic topography, on which fission track and (U‐Th)/He cooling ages commonly have disperse Paleozoic ages (Hueck et al, ; Kollenz et al, ; Oliveira et al, ).…”

Section: Introductionmentioning

confidence: 99%

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(U‐Th)/He Thermochronology and Zircon Radiation Damage in the South American Passive Margin: Thermal Overprint of the Paraná LIP?

et al. 2018

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New zircon and apatite (U-Th)/He data (AHe and ZHe) from the crystalline basement of the South American passive margin in southern Brazil present a wide distribution of Phanerozoic apparent ages, recording its prerift evolution. Its geological significance can be investigated by modeling the influence of the accumulated radiation damages on the measured crystals in its He ages during a long upper crust residence. Despite the presence of a significant fault in the studied area, the samples essentially constrain a uniform thermal history for the entire study area. Zircon helium ages spread from 472 to 26 Ma and correlate strongly with the radioactive element content of the crystals. Although the region was probably covered by Paleozoic sediments of the Paraná Basin, the ZHe system experienced a more intense thermal overprint, most likely the onset of the Paraná Large Igneous Province (LIP), causing its dispersion. The nearby intrusion of a feeding system of the LIP, the Florianópolis Dyke Swarm, may have contributed for keeping geothermal gradients elevated for a period long enough to promote the observed reset. After the extrusion of the volcanism, the study area was probably covered by up to 2 km of basalt floods, imprinting temperatures above the AHe partial retention zone on the crystalline basement. These were eroded during rapid cooling between 75 and 55 Ma, as indicated by thermal modeling. Additional analyses with Raman spectroscopy were used for calculating radiation damage ages in the zircon crystals measured for (U-Th)/He, resulting in a comparable set of ages.

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Section: Geological Settingmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

(U‐Th)/He Thermochronology and Zircon Radiation Damage in the South American Passive Margin: Thermal Overprint of the Paraná LIP?

et al. 2018

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“…Gondwanic cycle) and which has been also reported further south in Argentina and north in southernmost Brazil (Borba et al 2002(Borba et al , 2003Oliveira et al 2016;Kollenz et al 2017;Machado et al 2019). They suggest that the late Mesozoic reheating phase is associated to the Paraná-Etendeka LIP, which lava flows would have buried the UYS and caused an increase in the bedrock temperature.…”

Section: Results Of Previous Thermochronometry Studies In Uruguaymentioning

confidence: 86%

“…1), where a very complex thermal history has been reported (Jelinek et al 2003;Karl et al 2013;Hueck et al 2018a). Further south of this region, thermochronometry studies have reported mainly pre-rift Paleozoic cooling phases in southernmost Brazil (Borba et al 2002(Borba et al , 2003Oliveira et al 2016;Machado et al 2019), Uruguay (Kollenz 2015;Hueck et al 2017;Gomes & Almeida 2019) and Argentina (Kollenz et al 2017). These were generally linked to Paleozoic orogenic cycles on the active SW margin of Gondwana and the geodynamics of Gondwana breakup.…”

Section: Introductionmentioning

confidence: 97%

Low-temperature thermochronology of the South Atlantic margin along Uruguay and its relation to tectonic events in West Gondwana

et al. 2020

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The geodynamic forces acting during Jurassic-Cretaceous South Atlantic rifting provoked intense transformations in West Gondwana, such as the reactivation of ancient basement structures, broad magmatism and general uplift of the new continental margins.Low-temperature thermochronology records cooling associated with exhumation syn-and post-breakup along the Brazilian margin, while further south, in Uruguay, mostly pre-breakup uplift is identified. Thermochronometry data are scarce in Uruguay, but previous studies suggest that basement cooling and exhumation preceded West Gondwana breakup by hundreds of millions of years. To improve our knowledge of the evolution of rifting, we present 19 apatite fission-track ages in this study, 42 apatite and 40 zircon (U-Th)/He single crystal ages for the Uruguayan shield (UYS), from which we modeled 19 inverse thermal histories. Our results suggest that the UYS temperatures were below 200 °C since the early Paleozoic, and that cooling below 110 °C started during the Carboniferous, with continuous *Manuscript (with LINE NUMBERS) 2 exhumation of the basement until Early Cretaceous. The onset of this long-term uplift is correlated with orogenesis and terrane accretions in the SW margin of West Gondwana during the Paleozoic. Lithosphere thinning and uplift preceding breakup contributed to the continuous Late Paleozoic to middle Mesozoic exhumation, until the voluminous volcanism of the Paraná-Etendeka Large Igneous Province (c. 133 Ma). This magmatic event, combined with the thermal influence of the Tristão da Cunha mantle plume and rift spreading, likely raised the basement geotherm during the Late Cretaceous. Models suggest a slight increase in temperatures of the UYS from Late Cretaceous until the Oligocene, when a final cooling to surface temperatures took place. Our findings corroborate a long and complex thermal history for Uruguay, with crustal uplift occurring essentially before West Gondwana breakup.

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“…Preservation and location of these units seem to be related to long-term erosion patterns and Neogene extra-Andean structures, which are partially controlled by the ENE trending FZs related crustal fabric. Although, in the depicted eastern structures and paleosurfaces the exhumation trend would be negligible to thermochronology studies for their mild exhumation rates (Savignano et al, 2016;Kollenz et al, 2016).…”

Section: Overall Fracture Zones Segmentation Across Northern Patagonia (36 • To 48 • S)mentioning

confidence: 96%

Tectonic segmentation across Patagonia controlled by the subduction of oceanic fracture zones

Orts

Álvarez

Zaffarana

et al. 2021

Journal of Geodynamics

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A set of fracture zones left by transform faults segmenting the active Chile Ridge that separates the Nazca and Antarctica Plates has been subducting beneath western Patagonia in the last 18 Myr. The subduction direction of these fractures zones has remained almost unaltered during this time lapse since these intersected the Chilean trench. In this context, the analyzed Patagonian sector is associated with the subduction of a highly buoyant oceanic floor due to its relatively young age that contrasts with the ocean floor bathymetry to the north where oceanic crust gets progressively older up to the Eocene and consequently isostatically subsides. Short-term elastic deformational patterns associated with the earthquake cycle have been linked to this segmentation imposed by subducting fracture zones in previous works. Similarly, this work explores the relationship between long-term topography, seismicity, gravity, and magnetic anomalies as a proxy for upper crustal structure, deformation, exhumation, and consequently surface geology segmented nature associated with this pattern of oceanic fracture zones. Through these analyses, we have identified a series of ENE structural trends or lineaments across the continental crust that could be directly related to the segmented mechanical behavior of the plate interface and enhanced by particular climatic and tectonic history of the Patagonian region. These evidences could contribute to the understanding of how fracture zones can control, to a certain extent, the segmented nature of the upper plate in a subduction setting.

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Thermochronological constraints on the Cambrian to recent geological evolution of the Argentina passive continental margin

Cited by 18 publications

References 83 publications

(U‐Th)/He Thermochronology and Zircon Radiation Damage in the South American Passive Margin: Thermal Overprint of the Paraná LIP?

(U‐Th)/He Thermochronology and Zircon Radiation Damage in the South American Passive Margin: Thermal Overprint of the Paraná LIP?

Low-temperature thermochronology of the South Atlantic margin along Uruguay and its relation to tectonic events in West Gondwana

Tectonic segmentation across Patagonia controlled by the subduction of oceanic fracture zones

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