Maastrichtian to Danian Atlantic transgression in the north of Patagonia: A dinoflagellate cyst approach

Guler, M. Verónica; Estebenet, M. Sol González; Navarro, Edgardo; Astini, Ricardo A.; Panera, Juan Pablo Pérez; Ottone, Eduardo G.; Pieroni, Daniel R.; Paolillo, M.

doi:10.1016/j.jsames.2019.04.002

Cited by 31 publications

(22 citation statements)

References 81 publications

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“…Ratios between smectite and kaolinite suggest a change from a warm and seasonal climate to a relatively more perennial rainfall regime in the middle part of the unit, and a warm and less humid (probably subhumid) climate in the upper section. In addition, alternation between humid and arid conditions is suggested by marine dinoflagellate cysts occurring in late Maastrichtian to early Palaeocene deposits from Patagonia and neighbouring south-western Atlantic Ocean basins (Guler et al, 2019). Dolomite is more abundant at the top of the regressive cycle, because evaporitic conditions increased the Mg/Ca ratio of the lake water.…”

Section: Discussion Of Vertical Variation Of Facies and Mineralogymentioning

confidence: 99%

Climatic signals in lacustrine deposits of the Upper Yacoraite Formation, Western Argentina: Evidence from clay minerals, analcime, dolomite and fibrous calcite

et al. 2020

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Authigenic clays are an important control on reservoir quality in lacustrine carbonates but remain challenging to predict. Lacustrine depositional systems respond to climatic variations in rainfall, surface runoff and groundwater input, and evaporation, and result in rapid and frequent changes in lake volume; this is expressed through changing water depth and shoreline position. In the upper portion of the Early Palaeocene Yacoraite Formation of the Salta Basin in Argentina, extensive lacustrine deposits were deposited during the sag phase of rifting. Prior high‐resolution stratigraphic studies have suggested that climatic factors control microbial carbonate sequences within a ‘balanced fill’ lake, with variation in the lake level having a major influence on facies association changes. This study characterizes the evolution of facies and mineralogy within the Yacoraite Formation, focusing on the distribution of clay minerals, making a link between the high, medium and low‐frequency sequence stratigraphic cycles. The low‐frequency transgressive hemicycle of the upper portion of the Yacoraite Formation is comprised of abundant siliciclastic facies, suggesting a wetter period. Microbialites occurring in this interval are coarse‐grained and agglutinated. Detrital clay minerals such as illite and chlorite and associated siliciclastic sediments were input to the lake during high‐frequency transgressive periods. During high‐frequency regressive hemicycles, sedimentation was dominated by carbonate facies with Ca‐rich dolomite and the authigenic clays are comprised of chlorite/smectite mixed‐layers. By contrast, the low frequency regressive hemicycle records fine‐grained agglutinated microbialite with horizons of fibrous calcite, more stoichiometric dolomite, barite and authigenic magnesian smectite. This indicates elevated ion concentrations in the lake under intense evaporation during an arid period. Understanding the conditions that are favourable for formation and preservation of authigenic clays within the lacustrine environment can improve understanding of reservoir quality in comparable economically important deposits.

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Section: Discussion Of Vertical Variation Of Facies and Mineralogymentioning

confidence: 99%

Climatic signals in lacustrine deposits of the Upper Yacoraite Formation, Western Argentina: Evidence from clay minerals, analcime, dolomite and fibrous calcite

et al. 2020

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“…In the Southern Hemisphere D. californica has been recorded in the north of Patagonia, Argentina (Vellekoop et al, 2017b;Woelders et al, 2017;Guler et al, 2018Guler et al, , 2019, the Seymour Island, Antártida Argentina (Elliot et al, 1994;Askin and Jacobson, 1996) and New Zealand (Ferrow et al, 2011). Transitional morphotypes between Cordosphaeridium fibrospinosum and Danea californica occur in samples 965-970 to 985-990 mbgs in the SRC…”

Section: Early Paleocene Middle Danian Interval (Between 965-970 and ...mentioning

confidence: 99%

Late Maastrichtian to Danian organic-walled dinoflagellate cysts and calcareous nannofossils from eastern Austral Basin, Patagonia, Argentina

Estebenet

Guler

Panera

2021

Review of Palaeobotany and Palynology

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“…This conspicuous bed, featured as the marker of the retreatment of the 'Salamanca sea', is composed by a medium to dark grey siltstone, deposited within lagoon and swamps settings (Feruglio, 1949;Raigemborn et al, 2010;Clyde et al, 2014;Comer et al, 2015). La Colonia Formation is composed of offshore-shoreface facies in the lowermost part, and tidal-influenced mixed settings upward, along with a trend toward fresher water environments (Pascual et al, 2000;Cúneo et al, 2013bCúneo et al, , 2014Gasparini et al, 2015;Navarro et al, 2008Navarro et al, , 2012Guler et al, 2014Guler et al, , 2019Borel et al, 2016). Also, a mixed depositional system characterizes the Lefipán Formation.…”

Section: The Chronostratigraphic Package K-pg Involves Latestmentioning

confidence: 99%

Contribución a La Diversidad Del Registro Fósil De Tortugas (Testudinata) De La Provincia De Chubut (Argentina) Y Su Significado en La Comprensión De La Evolución De Las Tortugas en El Sur De Sudamérica

Sterli

Vlachos

Krause

et al. 2021

PEAPA

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In this work we focus on the fossil record of turtles and tortoises from the Chubut Province, in Patagonia, Argentina. This record is the richest, most diverse, the longest and continuous in the country and one of the most important in the continent. In this work, we present and study new fossils from all known clades of turtles from the province, coming from targeted field campaigns, as well as from past investigations, placed in a comprehensive and detailed chronostratigraphic context. In Chubut, more than 241 occurrences of turtles from at least 223 collection points are known, spanning from the Toarcian (Jurassic) to the Tortonian (Miocene). we manage to fill some of the gaps in the fossil record, complete the anatomical knowledge of many taxa, explore new geographical areas, and present some important highlights. Among these, the record of the oldest pan-chelid turtles indicates the significant potential of the sedimentary deposits of Chubut. Furthermore, we discuss the changes in the diversity and faunal turnovers of the various turtle clades in this region during the last 180 Ma and across important events during the Cretaceous/Paleocene and Oligocene/Miocene boundaries.

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Maastrichtian to Danian Atlantic transgression in the north of Patagonia: A dinoflagellate cyst approach

Cited by 31 publications

References 81 publications

Climatic signals in lacustrine deposits of the Upper Yacoraite Formation, Western Argentina: Evidence from clay minerals, analcime, dolomite and fibrous calcite

Climatic signals in lacustrine deposits of the Upper Yacoraite Formation, Western Argentina: Evidence from clay minerals, analcime, dolomite and fibrous calcite

Late Maastrichtian to Danian organic-walled dinoflagellate cysts and calcareous nannofossils from eastern Austral Basin, Patagonia, Argentina

Contribución a La Diversidad Del Registro Fósil De Tortugas (Testudinata) De La Provincia De Chubut (Argentina) Y Su Significado en La Comprensión De La Evolución De Las Tortugas en El Sur De Sudamérica

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