The Miocene marine transgression in the meridional Atlantic of South America

Aceñolaza, Florencio Gilberto; Sprechmann, Peter

doi:10.1127/njgpa/225/2002/75

Cited by 17 publications

(16 citation statements)

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“…The Paranense Sea, a large paleoestuary of the South Atlantic of Middle Miocene-lower Pliocene age, is developed south of the Chaco Basin (Aceñolaza and Sprechmann, 2002). Marengo (2000) and Alonso (2000) suggest that the marine transgressions of the Paranense Sea reached from Uruguay through northern Argentina to Paraguay and probably into the southern Bolivian Chaco Basin.…”

Section: Comparison: Yecua Formation and Paranense Seamentioning

confidence: 98%

“…However, the Late Burdigalian sealevel high has not been established for the Chaco Basin in southern Bolivia. (Webb, 1995); (2) marine Yecua facies of the Bolivia Chaco Basin; (3) marine facies of the Paranense Sea (Aceñolaza and Sprechmann, 2002); (4) marine facies in the Amazon Basin (Wesselingh et al, 2002); (5) possible marine seaway between the Paranense Sea and the Bolivian Chaco Basin; (6) possible marine seaway between the Amazon Basin and the Chaco Basin.…”

Section: Comparison: Yecua Formation and Amazon Basinmentioning

confidence: 99%

“…At the same time, tectonic subsidence increased in the Chaco Basin (Gubbels et al, 1993). Combined with a eustatic sealevel highstand between the Oligocene and Late Miocene (Aceñolaza and Sprechmann, 2002), shallow restricted marine incursions transgressed into southeastern Bolivia and are represented there by the Middle-Late Miocene Yecua Formation (Marshall and Sempere, 1991;Marshall et al, 1993).…”

Section: Introductionmentioning

confidence: 95%

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Depositional setting of the Middle to Late Miocene Yecua Formation of the Chaco Foreland Basin, southern Bolivia

Hulka

Gräfe

Sames

et al. 2006

Journal of South American Earth Sciences

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Section: Comparison: Yecua Formation and Paranense Seamentioning

confidence: 98%

Section: Comparison: Yecua Formation and Amazon Basinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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Depositional setting of the Middle to Late Miocene Yecua Formation of the Chaco Foreland Basin, southern Bolivia

Hulka

Gräfe

Sames

et al. 2006

Journal of South American Earth Sciences

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“…This inference is congruent with the palaeobiogeographical analyses of Cozzuol (2006) and Carrillo et al (2015), according to which the affinities between several Late Miocene, northern and southern South American land mammal assemblages are strong or, at least, not so distant as those between Middle Miocene assemblages from the same regions. This pattern might be explained from the geographical shrinks of the Pebas Mega-Wetland System and the Paranean Sea in the Middle-Late Miocene transition (Aceñolaza & Sprechmann 2002; Cozzuol 2006; Salas-Gismondi et al 2015). It is also possible that the expansion of open biomes in South America during the Late Miocene has facilitated this biotic connection, as has been acknowledged in the case of other mammal taxa (e.g.…”

Section: Discussionmentioning

confidence: 99%

The first fossil skull of an anteater (Vermilingua, Myrmecophagidae) from northern South America, a taxonomic reassessment ofNeotamanduaand a discussion of the myrmecophagid diversification

Jiménez-Lara

González

2019

Preprint

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The evolutionary history of the South American anteaters, Vermilingua, is incompletely known as consequence of the fragmentary and geographically biased nature of the fossil record of this group. Neotamandua borealis is the only recorded extinct species from northern South America, specifically from the Middle Miocene of La Venta area, southwestern Colombia. A new genus and species of myrmecophagid for La Venta, Gen. et sp. nov., is here described based on a new partial skull. Additionally, given that the co-occurrent species of Gen. et sp. nov., N. borealis, was originally referred to as Neotamandua, the taxonomic status of this genus is revised. The morphological and taxonomic analyses of these taxa indicate that Gen. et sp. nov. may be related to Tamandua and that the justification of the generic assignments of the species referred to as Neotamandua is weak or insufficient. Two species previously referred to as Neotamandua (N. magna and N.? australis) were designated as species inquirendae and new diagnostic information for the redefined genus and its type species, N. conspicua, is provided. Together, these results suggest that the diversification of Myrmecophagidae was taxonomically and biogeographically more complex than what has been proposed so far. Considering the new evidence, it is proposed a synthetic model on the diversification of these xenartrans during the late Cenozoic based on the probable relationships between their intrinsic ecological constraints and some major abiotic changes in the Americas.

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“…Stratigraphic and structural relationships, lithofacies, and paleocurrent patterns (Viramonte et al 1994;Hilley and Strecker 2005;Mazzuoli et al 2008), suggest that, during the Late Miocene, the El Toro region extended eastward in the central Andes foreland as a continuous depositional basin. At the time of the BAT volcanic activity, the foreland basin of the central Andes was represented by the epicontinental Paranense Basin, a large paleoestuary of the South Atlantic (Marshall et al 1993;Aceñolaza and Sprechmann 2002;Hernandez et al 2005). In NW Argentina, the westernmost limit of the marine strata of the Paranense Basin is documented in outcrops located at 24°-26°S and 65°-66°W (Jordan and Alonso 1987), ∼40 km to the SE of the El Toro basin (Alonso 2000).…”

Section: Structural and Paleoenvironmental Significancementioning

confidence: 97%

Non-explosive magma–water interaction in a continental setting: Miocene examples from the Eastern Cordillera (central Andes; NW Argentina)

et al. 2008

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The Middle-Upper Miocene Las Burras-AlmagroEl Toro (BAT) igneous complex within the Eastern Cordillera of the central Andes (∼24°S; NW Argentina) has revealed evidence of non-explosive interaction of andesitic magma with water or wet clastic sediments in a continental setting, including peperite generation. We describe and interpret lithofacies and emplacement mechanisms in three case studies. The Las Cuevas member (11.8 Ma) comprises facies related to: (i) andesite extruded in a subaqueous setting and generating lobe-hyaloclastite lava; and (ii) marginal parts of subaerial andesite lava dome(s) in contact with surface water, comprising fluidal lava lobes, hyaloclastite, and juvenile clasts with glassy rims. The Lampazar member (7.8 Ma) is represented by a syn-volcanic andesite intrusion and related peperite that formed within unconsolidated, water-saturated, coarse-grained volcaniclastic conglomerate and breccia. The andesite intrusion is finger-shaped and grades into intrusive pillows. Pillows are up to 2 m wide, tightly packed near the intrusion fingers, and gradually become dispersed in the host sediment ≥50 m from the parent intrusion. The Almagro A member (7.2 Ma) shows evidence of mingling between water-saturated, coarsegrained, volcaniclastic alluvial breccia and intruding andesite magma. The resulting intrusive pillows are characterized by ellipsoidal and tubular shape and concentric structure. The high-level penetration of magma in this coarse sediment was unconfined and irregular. Magma was detached in apophyses and lobes with sharp contacts and fluidal shapes, and without quench fragmentation and formation of a hyaloclastite envelope. The presence of peperite and magma-water contact facies in the BAT volcanic sequence indicates the possible availability of water in the system between 11-7 Ma and suggests a depositional setting in this part of the foreland basin of the central Andes characterized by an overall topographically low coastal floodplain that included extensive wetlands.

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The Miocene marine transgression in the meridional Atlantic of South America

Cited by 17 publications

References 0 publications

Depositional setting of the Middle to Late Miocene Yecua Formation of the Chaco Foreland Basin, southern Bolivia

Depositional setting of the Middle to Late Miocene Yecua Formation of the Chaco Foreland Basin, southern Bolivia

The first fossil skull of an anteater (Vermilingua, Myrmecophagidae) from northern South America, a taxonomic reassessment ofNeotamanduaand a discussion of the myrmecophagid diversification

Non-explosive magma–water interaction in a continental setting: Miocene examples from the Eastern Cordillera (central Andes; NW Argentina)

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