Palaeomagnetic study of Lower Jurassic marine strata from the Neuquén Basin, Argentina: A new Jurassic apparent polar wander path for South America

Llanos, María Paula Iglesia; Riccardi, Alberto; Singer, Silvia

doi:10.1016/j.epsl.2006.10.006

Cited by 41 publications

(9 citation statements)

References 40 publications

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“…Comparison with palaeomagnetic data (Volkheimer et al, 2008) shows that the Neuquén Basin shifted from the highest palaeolatitudes (50°S), by the end of the Triassic to the end of the Sinemurian. During the Pliensbachian-Toarcian (189.6-175.6 Ma) it moved northward, reaching the lowermost palaeolatitudes (25°S) and, subsequently (Middle to Late Jurassic), the area moved again and eventually attained a position similar to its present-day position (30°S) (Iglesia Llanos, Riccardi & Singer, 2006). These movements are reflected by the Jurassic palynofloras.…”

Section: Jurassicmentioning

confidence: 92%

Changes of the palynobiotas in the Mesozoic and Cenozoic of Patagonia: a review

Quattrocchio

Volkheimer

Borrromei

et al. 2011

Biological Journal of the Linnean Society

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This study describes the compositional changes of Mesozoic-Cenozoic palynologic assemblages in Patagonia, the succession of phytogeographic scenarios and some evolutionary key events. The Triassic 'Ipswich Microflora', characterized by bisaccate pollen and high frequencies of trilete spores, represents the warm-temperate province of south-western Gondwana (Dicroidium Flora), followed in time, in Patagonia, near the Triassic/Jurassic boundary, by the 'Classopollis Microflora', indicating warm and (seasonal) arid conditions. Araucariaceans and podocarpaceans grew on Jurassic uplands. The exclusively Early Cretaceous taxa Cyclusphaera and Balmeiopsis (Coniferae) appeared in the Valanginian. The oldest angiospermous pollen types of Argentina appear in the Barremian-Aptian of southern Patagonia. During the Maastrichtian, the Nothofagaceae and Myrtaceae are incoming. In the Palaeocene, a vegetation dominated by tropical elements would have developed in Patagonia. Increasing Nothofagidites frequency in northern Patagonia during the Middle to Late Eocene indicates climatic change from warm to temperate. Of three Early to Middle Miocene phytogeographic provinces (NeotropicalTransitional and Austral), the Transitional one was replaced during the Late Miocene-Pliocene by the xerophytic Proto Espinal/Steppe with a shrubby-herbaceous vegetation. The Pleistocene and Holocene times were characterized by frequent latitudinal and altitudinal changes in the vegetation distribution, as a response to recurrent climatic oscillations, fluctuations of sea level and ice extent, and changing patterns of atmospheric circulation.

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Section: Jurassicmentioning

confidence: 92%

Changes of the palynobiotas in the Mesozoic and Cenozoic of Patagonia: a review

Quattrocchio

Volkheimer

Borrromei

et al. 2011

Biological Journal of the Linnean Society

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“…3) and comprises more than 400 m of sandstone, heterolithic, and mudstone-dominated deposits that accumulated in a variety of marginal-marine settings (Zavala, 1996a,b;McIlroy et al, 2005;Gugliotta et al, 2015Gugliotta et al, , 2016a. During the Middle Jurassic, South America was located at a similar orientation and latitude to the present-day configuration (Iglesia Llanos et al, 2006;Iglesia Llanos, 2012) and was part of the western margin of Gondwana. The palaeoclimate of the study area has been interpreted by several palynological studies as warm and mainly arid (Quattrocchio et al, 2001;Martinez et al, 2002;Garcia et al, 2006;Iglesias et al, 2011;Stukins et al, 2013), but with variable precipitation through the year (Gugliotta et al, 2016b) and evidence for wildfires is reported (Marynowski et al, 2011).…”

Section: Geological Backgroundmentioning

confidence: 99%

Recognition criteria, characteristics and implications of the fluvial to marine transition zone in ancient deltaic deposits (Lajas Formation, Argentina)

et al. 2016

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The seaward end of modern rivers is characterized by the interactions of marine and fluvial processes, a tract known as the fluvial to marine transition zone, which varies between systems due to the relative strength of these processes. To understand how fluvial and tidal process interactions and the fluvial to marine transition zone are preserved in the rock record, large‐scale outcrops of deltaic deposits of the Middle Jurassic Lajas Formation (Neuquén Basin, Argentina) have been investigated. Fluvial–tidal indicators consist of cyclically distributed carbonaceous drapes in unidirectional, seaward‐oriented cross‐stratifications, which are interpreted as the result of tidal modulation of the fluvial current in the inner part of the fluvial to marine transition zone. Heterolithic deposits with decimetre‐scale interbedding of coarser‐grained and finer‐grained facies with mixed fluvial and tidal affinities are interpreted to indicate fluvial discharge fluctuations (seasonality) and subordinate tidal influence. Many other potential tidal indicators are argued to be the result of fluvial–tidal interactions with overall fluvial dominance or of purely fluvial processes. No purely tidal or tide‐dominated facies were recognized in the studied deposits. Moreover, fluvial–tidal features are found mainly in deposits interpreted as interflood (forming during low river stage) in distal (delta front) or off‐axis (interdistributary) parts of the system. Along major channel axes, the interpreted fluvial to marine transition zone is mainly represented by the fluvial‐dominated section, whereas little or no tide‐dominated section is identified. The system is interpreted to have been hyposynchronous with a poorly developed turbidity maximum. These conditions and the architectural elements described, including major and minor distributary channels, terminal distributary channels, mouth bars and crevasse mouth bars, are consistent with an interpretation of a fluvial‐dominated, tide‐influenced delta system and with an estimated short backwater length and inferred microtidal conditions. The improved identification of process interactions, and their preservation in ancient fluvial to marine transition zones, is fundamental to refining interpretations of ancient deltaic successions.

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“…), although the Jurassic – Cretaceous boundary is considered to be a temporal cooler episode without development of large ice caps (Markello et al ., ; Iglesias et al ., ). Located near its current day latitudes around 30°S, the Neuquén Basin was in warm and semi‐arid to arid conditions (Llanos et al ., ; Volkheimer, ).…”

Section: Geological Settingmentioning

confidence: 99%

Depositional controls on mixed carbonate–siliciclastic cycles and sequences on gently inclined shelf profiles

et al. 2015

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The interplay between carbonate production and siliciclastic input produces mixed systems that typically contain a very high degree of lateral and vertical facies heterogeneity. This heterogeneity complicates the sequence stratigraphic analysis of mixed systems. Outcrop studies facilitate the deciphering of controls and understanding of facies distributions within sedimentary successions. The Picún Leufú Anticline in the Neuquén Basin (Argentina) offers the opportunity to integrate large‐scale depositional architecture with detailed facies descriptions of the shelf to basin successions of the Upper Jurassic – Lower Cretaceous Quintuco – Picún Leufú – Vaca Muerta System. The strata in the system are mixed and range in depositional environments from shallow marine sandstones and limestones to deep basinal shales. These environments are arranged in metre‐scale shallowing upward cycles and cycle sets, with increasing carbonate proportions in regressive hemicycles. Increased input of siliciclastic material from the volcanic arc area occurred during phases of relative sea‐level rise and was controlled by the intensity of along‐shelf currents. The shelf transport was driven by the available accommodation space on the shelf, and therefore was a function of the eustatic sea‐level fluctuations. Within the studied section, a pure carbonate depositional system developed because siliciclastic input was shut down either due to long‐lived highstand settings or a sudden climatic change to more arid conditions. Carbonate–siliciclastic mixing in this setting is a function of siliciclastic dilution of the carbonate sedimentation and differs from the classical reciprocal sedimentation model, which typically includes shut‐off of carbonate production during lowstand periods. In the regional context, the subsurface strata of time‐equivalent reservoirs in the Eastern Neuquén Embayment display strong similarities of architecture, indicating that similar mixing processes occurred along most of the Neuquén Basin.

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Palaeomagnetic study of Lower Jurassic marine strata from the Neuquén Basin, Argentina: A new Jurassic apparent polar wander path for South America

Cited by 41 publications

References 40 publications

Changes of the palynobiotas in the Mesozoic and Cenozoic of Patagonia: a review

Changes of the palynobiotas in the Mesozoic and Cenozoic of Patagonia: a review

Recognition criteria, characteristics and implications of the fluvial to marine transition zone in ancient deltaic deposits (Lajas Formation, Argentina)

Depositional controls on mixed carbonate–siliciclastic cycles and sequences on gently inclined shelf profiles

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