Paleogene calcareous nannofossil biostratigraphy for two boreholes in the eastern Austral Basin, Patagonia, Argentina

Panera, Pérez; Pablo, Juan

doi:10.5027/andgeov40n1-a06

Cited by 7 publications

(7 citation statements)

References 15 publications

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“…The most common calcareous nannofossil species in the recovered assemblages are Chiasmolithus bidens, Chiasmolithus solitus , Fasciculithus tympaniformis , Prinsius martinii , Prinsius bisulcus , Toweius callosus , Toweius eminens , and Toweius pertusus. This assemblage bears similarities with the Lower Uribe Formation from the subsurface of Tierra del Fuego (Mostajo, 1991; Thissen & Pérez Panera, 2021) and the Lower Magallanes Formation from the subsurface of Santa Cruz province (Pérez Panera, 2013) (Fig. 7).…”

Section: Discussionmentioning

confidence: 67%

“…References: 1, Bedoya Agudelo et al (2018); 2, Bedoya Agudelo (2019); 3. This work; 4, Mostajo (1991); 5, Thissen & Pérez Panera (2021); 6, Pérez Panera (2009); 7, Pérez Panera (2013); 8, Olivero et al (2002); 9, Malumián et al (2009); 10, Torres Carbonell et al (2009); 11, Malumián & Jannou (2010); 12, Quattrocchio (2021).…”

Section: Discussionmentioning

confidence: 87%

“…The Toweius -Reticulofenestra turnover is an important event of the early Eocene, recorded in high and low latitudes around biozones NP12 and NP13 (Martini, 1971;Agnini et al, 2006;Shamrock & Watkins, 2012;Shepherd & Kulhanek, 2016). (Mostajo, 1991;Pérez Panera, 2009, 2013 (Fig. 7).…”

Section: )mentioning

confidence: 99%

“…The late Paleocene and Paleocene/Eocene boundary seem absent in subsurface units in the southeastern Santa Cruz Province and northern Tierra del Fuego Island (Pérez Panera, 2009Panera, , 2013Thissen & Pérez Panera, 2021).…”

Section: )mentioning

confidence: 99%

“…Detailed calcareous nannofossil biostratigraphic studies have been done in subsurface successions of the northern Isla Grande de Tierra del Fuego and southeast Santa Cruz Province ( e.g. , Mostajo, 1991; Pérez Panera, 2009, 2013; Thissen & Pérez Panera, 2021). These studies prove the usefulness of calcareous nannofossils for relative age determination and intrabasinal correlation in the Austral Basin.…”

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confidence: 99%

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Late Paleocene to Middle Eocene Calcareous Nannofossil Assemblages from Península Mitre, Southeastern Austral Basin, Argentina

Agudelo¹

2023

Ameghiniana

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On the Fueguian Atlantic coast and in the southern Andean fold and thrust belt, the Paleogene is partially represented by numerous turbiditic systems. Between Río Bueno and Cabo Leticia on Península Mitre, the Paleocene-Eocene is represented by the Río Claro Group (Cabo Leticia, La Barca, Punta Noguera and Cerro Ruperto formations) and the Río Bueno Formation; which together constitute a ~1050 m thickness succession. Here, calcareous nannofossil assemblages recovered from 96 samples were analyzed to determine their relative ages. The Cabo Leticia Formation was barren in nannofossils. The upper LB2 Member of La Barca Formation, contained Rhomboaster cuspis and Fasciculithus richardii, frequent in the Paleocene/Eocene boundary (Subzones NP9a/NP9b). Nannofossils recovered from Punta Noguera Formation indicate an early Eocene age (biozones NP9b-NP10), with Fascilulithus tympaniformis, Rhomboaster cuspis and abundant Toweius spp. The Cerro Ruperto Formation provided one productive sample, with specimens of Reticulofenestra spp. and Toweius spp., which indicates an early Eocene age for the formation (biozones NP12-NP13). The Río Bueno Formation yield calcareous nannofossil assemblages characterized by Chiasmolithus eograndis, Chiasmolithus expansus, Toweius spp. and Reticulofenestra spp. which indicates a late early Eocene to middle Eocene age (biozones NP14-NP16). Although the calcareous nannofossil record is discontinuous due to sedimentary facies of the Río Claro Group, our data allow a better age constraint for the investigated formations and to correlate these units with others outcropping and subsurface units in the Austral Basin.

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Section: Discussionmentioning

confidence: 67%