Oceanographic and climatic consequences of the tectonic evolution of the southern scotia sea basins, Antarctica

Pérez, Lara F.; Hernández-Molina, F. Javier; Lodolo, Emanuele; Bohoyo, Fernando; Galindo-Zaldı́var, Jesús; Maldonado, Andrés

doi:10.1016/j.earscirev.2019.102922

Cited by 29 publications

(21 citation statements)

References 95 publications

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“…Several challenges prevent a clear understanding the timing and evolution of the opening of Drake Passage. First, the Drake Passage area represents a series of oceanic basins, spreading-and subduction zones and continental micro-blocks, which makes tectonic restoration a complex puzzle (Lagabrielle et al, 2009;Pérez et al, 2019). Second, these micro-blocks likely underwent a series of submersion and uplifting phases, which makes recurring obstruction and re-opening of Drake Passage a possibility.…”

Section: Introductionmentioning

confidence: 99%

“…1) and contains several (at present-day) submerged continental blocks that were separated from the American and west-Antarctic plates in the process of rifting. Between these blocks, oceanic crust formed along a number of mid-ocean ridges (Lagabrielle et al, 2009;Pérez et al, 2019). Continental extension likely started prior to the earlymiddle Eocene boundary (~49 Ma;Livermore et al, 2005;Lagabrielle et al, 2009) and ocean crust formed from the late Eocene onwards (Eagles and Livermore, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow

Bijl

Guerstein

Jaimes

et al. 2021

andgeo

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The tectonic opening of the Tasmanian Gateway and Drake Passage represented crucial geographic requirements for the Cenozoic development of the Antarctic Circumpolar Current (ACC). Particularly the tectonic complexity of Drake Passage has hampered the exact dating of the opening and deepening phases, and the consequential onset of throughflow of the ACC. One of the obstacles is putting key regional tectonic events, recorded in southern Patagonian sediments, in absolute time. For that purpose, we have collected Campanian-Eocene sediment samples from the Chilean sector of Southern Patagonia. Using U-Pb radiometric dating on zircons and dinoflagellate cyst biostratigraphy, we updated age constraints for the sedimentary formations, and the hiatuses in between. Thick sedimentary packages of shallow-marine and continental sediments were deposited in the foreland basin during the early Campanian, mid-Paleocene, the Paleocene-Eocene boundary interval and the middle Eocene, which represent phases of increased foreland subsidence. We interpret regional sedimentary hiatuses spanning the late Campanian, early-to mid-Paleocene, mid-Eocene and latest Eocene-early Oligocene to indicate times of reduced foreland subsidence, relative to sediment supply. We relate these changes to varying subduction rates and Andean orogeny. Dinoflagellate cyst assemblages suggest that the region was under the influence of the Antarctic-derived waters through the western boundary current of the Subpolar Gyre, developed in the southwest Atlantic Ocean and thus argues for limited throughflow through the Drake Passage until at least the latest Eocene. However, the proliferation of dinoflagellate endemism we record in the southwest Atlantic is coeval with that in the southwest Pacific, and on a species level, dinoflagellate cyst assemblages are the same in these two regions. This suggests that both regions were oceanographically connected throughout the early Paleogene, likely through a shallow opening of a restricted Drake Passage. This implies a continuous surface-water connection between the south Pacific and the South Atlantic throughout the late Cretaceous-early Paleogene.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow

Bijl

Guerstein

Jaimes

et al. 2021

andgeo

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“…Based on Piotrowski et al (2004), Robinson and van de Flierdt (2009), and Skinner et al (2013), CDW was very likely much more radiogenic (higher ε Nd ) during glacials because of lower admixing of NADW relative to CDW. In combination with modeling efforts, we will (1) assess past changes in water mass composition using authigenic neodymium isotopes to test the ocean thermal forcing hypothesis for previous terminations (e.g., Böhm et al, 2015;Howe and Piotrowski, 2017) and (2) test whether changes in NADW, CDW, and WSDW are associated with the formation of Reflectors a, b, and c (Pérez et al, 2014b(Pérez et al, , 2017(Pérez et al, , 2019. Another sensitive proxy that should provide information on water mass sourcing is authigenic Pb isotope compositions, for which records will be generated alongside the Nd isotopic reconstructions (e.g., Kurzweil et al, 2010).…”

Section: Water Mass Changes and Ocean Thermal Forcingmentioning

confidence: 99%

Volume 382: Iceberg Alley and Subantarctic Ice and Ocean Dynamics

Weber¹,

Raymo²,

Peck³

et al. 2021

Proceedings of the International Ocean Discovery Program

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“…Finally, in more recent times (< 3 Ma), the formation of the Isthmus of Panama allowed for a land connection between South and North Americas and a new dispersal of biota between continents 24 – 26 . These tectonic processes changed climate at a global and local level because of a rearrangement of the oceanic currents and changes in the pattern of rain and winds 15 , 22 , 27 , 28 .…”

Section: Introductionmentioning

confidence: 99%

The multicausal twilight of South American native mammalian predators (Metatheria, Sparassodonta)

Tarquini

Ladevèze²,

Prevosti

2022

Sci Rep

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Sparassodonts were the apex mammalian predators of South America throughout most of the Cenozoic, diversifying into a wide array of niches including fox-like and even saber-toothed forms. Their extinction is still controversial, with different authors suggesting competition with other predators (placental carnivorans, terror birds, and carnivorous opossums), extinction of prey, and climate change as causal explanations. Here, we analyse these hypotheses using a novel approach implicating Bayesian analyses. We find that speciation and extinction rates of sparassodonts can be correlated with (i) intrinsic biotic factors such as changes in body mass and diversity of sparassodonts, (ii) extrinsic biotic factors such as potential prey diversity, and iii) extrinsic abiotic factors like the atmospheric CO2, sea level, temperature, and uplift of the Andes. Thus, sparassodonts are a good example of a multilevel mixed model of evolution, where various factors drove the evolutionary history of this clade in a pluralistic way. There is no evidence for competition between Sparassodonta and others predators, and the effect of competition in the face of extinctions of fossil species should be tested and not assumed. Furthermore, we propose a novel approach for evaluating the fossil record when performing macroevolutionary analyses.

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Oceanographic and climatic consequences of the tectonic evolution of the southern scotia sea basins, Antarctica

Cited by 29 publications

References 95 publications

Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow

Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow

Volume 382: Iceberg Alley and Subantarctic Ice and Ocean Dynamics

The multicausal twilight of South American native mammalian predators (Metatheria, Sparassodonta)

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