Tectonic events reflected by palaeocurrents, zircon geochronology, and palaeobotany in the Sierra Baguales of Chilean Patagonia

Gutiérrez, Néstor M.; Roux, J.P. Le; Vasquez, Ana; Carreño, Catalina; Pedroza, Viviana; Araos, José; Oyarzún, José Luis; Pino, Juan Pablo; Rivera, Huber A.; Hinojosa, Luis Felipe

doi:10.1016/j.tecto.2016.12.014

Cited by 30 publications

(36 citation statements)

References 85 publications

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“…Similarly, Eocene zircon grains and fossil assemblages within the Man Aike Formation at Cerro Fortaleza confirm a correlation with the Man Aike Formation that has been mapped in the Rio Baguales area of Chile (Fig. a; Schwartz et al ., ; Gutiérrez et al ., ). Oligocene zircon grains from Cenozoic rocks on the south shore of Lago Viedma suggest that the unit is possibly correlative with the Rio Leona Formation that is mapped in the Rio Baguales area of Chile (Gutiérrez et al ., ) and/or the Rio Turbio Formation that has been mapped on the Chile–Argentina border, 70 km to the south (Fosdick et al ., ).…”

Section: Implications Of the Refined Frameworkmentioning

confidence: 99%

Refining stratigraphy and tectonic history using detrital zircon maximum depositional age: an example from the Cerro Fortaleza Formation, Austral Basin, southern Patagonia

2018

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The north–south trending, Late Cretaceous to modern Magallanes–Austral foreland basin of southernmost Patagonia lacks a unified, radiometric, age‐controlled stratigraphic framework. By simplifying the sedimentary fill of the basin to deep‐marine, shallow‐marine and terrestrial deposits, and combining 13 new U‐Pb detrital zircon maximum depositional ages (DZ MDAs) with published DZ MDAs and U‐Pb ash ages, we provide the first attempt at a unified, longitudinal stratigraphic framework constrained by radiometric age controls. We divide the foreland basin history into two phases, including (1) an initial Late Cretaceous shoaling upward phase and (2) a Cenozoic phase that overlies a Palaeogene unconformity. New DZ samples from the shallow‐marine La Anita Formation, the terrestrial Cerro Fortaleza Formation and several previously unrecognized Cenozoic units provide necessary radiometric age controls for the end of the Late Cretaceous foreland phase and the magnitude of the Palaeogene unconformity in the Austral sector of the basin. These samples show that the La Anita and Cerro Fortaleza Formations have Campanian DZ MDAs, and that overlying Cenozoic strata have Eocene to Miocene DZ MDAs. By filling this data gap, we are able to provide a first attempt at constructing a basinwide, age‐controlled stratigraphic framework for the Magallanes–Austral foreland basin. Results show southward progradation of shallow marine and terrestrial environments from the Santonian through the Maastrichtian, as well as a northward increase in the magnitude of the Palaeogene unconformity. Furthermore, our new age data significantly impact the chronology of fossil flora and dinosaur faunas in Patagonia.

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Section: Implications Of the Refined Frameworkmentioning

confidence: 99%

Refining stratigraphy and tectonic history using detrital zircon maximum depositional age: an example from the Cerro Fortaleza Formation, Austral Basin, southern Patagonia

2018

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“…However, we cannot rule out the probable contribution of Palaeozoic zircons from the Río Chico-Dungeness Arch (Fig. 1a) in the Dorotea strata, as previously suggested by Gutiérrez et al (2017) 100 km north of our study area.…”

Section: Modal Composition and Detrital Zircon U-pb Age Distributionmentioning

confidence: 52%

“…In the Magallanes Province, Betka et al (2015) suggested a phase of out-of-sequence thrusting and basement-involved reverse faulting beginning in the Maastrichtian and extending to the Paleogene. The deformation and cooling ages of ophiolitic blocks in the hinterland around 74-72 Ma (Rapalini et al, 2008) together with progradation and depositional system shoaling (Tres Pasos and Dorotea formations) (Covault et al, 2009;Romans et al, 2009;Schwartz and Graham, 2015;Schwartz et al, 2017;Gutiérrez et al, 2017) may also reflect deformation in the fold-thrust belt. In Tierra del Fuego, brittle-ductile deformation in the internal thrust-belt took place between ~72-64 Ma ("D1" contraction event; see Torres-Carbonell et al, 2013) concomitant with an uplift in the Cordillera Darwin Complex (Kohn et al, 1995).…”

Section: Tectonic Events In the Fold-thrust Beltmentioning

confidence: 99%

“…9c). In the Ultima Esperanza Province, the shift from slope deposits of the Tres Pasos Formation to a deltaic system of the Dorotea Formation (Shultz et al, 2005;Romans et al, 2009;Schwartz and Graham, 2015;Gutiérrez et al, 2017) (Fig. 9a) Fig.…”

Section: Evolution Of Depositional Systemsmentioning

confidence: 99%

“…Only the overlying highstand system tract (HST) can be recognised (Fig. 10a), manifested in the Ultima Esperanza Province by the transition from shelf deposits of the Tres Pasos Formation (Gutiérrez et al, 2017) to deltaic deposits of the Dorotea Formation (Fig. 10b).…”

Section: The Limit Between the Tres Pasos-dorotea Formations At Cerromentioning

confidence: 99%

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Tectonic controls on the Maastrichtian-Danian transgression in the Magallanes-Austral foreland basin (Chile): Implications for the growth of the Southern Patagonian Andes

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A unique Late Cretaceous fossil wood assemblage from Chilean Patagonia provides clues to a high‐latitude continental environment

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Manríquez

et al. 2023

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Fossil plants, including large trunks, stems, some branches, and twigs, were collected from the Maastrichtian (68.9 Ma), upper Dorotea Formation in the Magallanes–Austral Basin, 16 km north of the Cerro Guido–Las Chinas complex in the southern Chilean Magallanes region. These fossil trunks range from 0.2 to 2.2 m in length. Petrographic slides were made in three sections (transverse, radial and tangential) and analysed under a light microscope to study the permineralized fossils. The woods and stems belong to Austroginkgoxylon gen. et sp. nov., Agathoxylon antarcticum, Podocarpoxylon paradoxi sp. nov., Podocarpoxylon mazzonii, Palmoxylon subantarcticae and Notomalvaceoxylon magallanense gen. et sp. nov. The growth rings of gymnosperms and anatomical characters of angiosperms were analysed to obtain palaeoecological data. Interactions between gymnosperm roots growing into the secondary xylem of an angiosperm (nurse logs) are recorded. The data obtained from the fossil woods suggest warm and humid conditions in this southern South American locality during the Late Cretaceous, providing a unique opportunity to study continental environments at high southern latitudes, which are poorly represented on a global scale.

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Tectonic events reflected by palaeocurrents, zircon geochronology, and palaeobotany in the Sierra Baguales of Chilean Patagonia

Cited by 30 publications

References 85 publications

Refining stratigraphy and tectonic history using detrital zircon maximum depositional age: an example from the Cerro Fortaleza Formation, Austral Basin, southern Patagonia

Refining stratigraphy and tectonic history using detrital zircon maximum depositional age: an example from the Cerro Fortaleza Formation, Austral Basin, southern Patagonia

Tectonic controls on the Maastrichtian-Danian transgression in the Magallanes-Austral foreland basin (Chile): Implications for the growth of the Southern Patagonian Andes

A unique Late Cretaceous fossil wood assemblage from Chilean Patagonia provides clues to a high‐latitude continental environment

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