Evolution of a Callovian-Oxfordian carbonate margin in the Neuquén Basin of west-central Argentina: facies, architecture, depositional sequences and global sea-level changes

1991 ◽  
Vol 70 (2-4) ◽  
pp. 209-240 ◽  
Author(s):  
Leonardo Legarreta
Keyword(s):  
Sea Level ◽  
Sea Level Changes ◽  
Depositional Sequences ◽  
Facies Architecture ◽  
Central Argentina ◽  
West Central ◽  
Neuquen Basin ◽  
Neuquén Basin ◽  
Global Sea Level

scholarly journals Reconstruction of the depositional sedimentary environment of Oligocene deposits (Qom Formation) in the Qom Basin (northern Tethyan seaway), Iran

Geologos ◽  
2020 ◽  
Vol 26 (2) ◽  
pp. 93-111
Author(s):  
Amrollah Safari ◽  
Hossein Ghanbarloo ◽  
Parisa Mansoury ◽  
Mehran Mohammadian Esfahani
Keyword(s):  
Sea Level ◽  
Sedimentary Environment ◽  
Depositional Environments ◽  
Sea Level Changes ◽  
Third Order ◽  
Depositional Sequences ◽  
Qom Formation ◽  
Tethyan Seaway ◽  
Qom Basin ◽  
Global Sea Level

AbstractDuring the Rupelian–Chattian, the Qom Basin (northern seaway basin) was located between the Paratethys in the north and the southern Tethyan seaway in the south. The Oligocene deposits (Qom Formation) in the Qom Basin have been interpreted for a reconstruction of environmental conditions during deposition, as well as of the influence of local fault activities and global sea level changes expressed within the basin. We have also investigated connections between the Qom Basin and adjacent basins. Seven microfacies types have been distinguished in the former. These microfacies formed within three major depositional environments, i.e., restricted lagoon, open lagoon and open marine. Strata of the Qom Formation are suggested to have been formed in an open-shelf system. In addition, the deepening and shallowing patterns noted within the microfacies suggest the presence of three third-order sequences in the Bijegan area and two third-order depositional sequences and an incomplete depositional sequence in the Naragh area. Our analysis suggests that, during the Rupelian and Chattian stages, the depositional sequences of the Qom Basin were influenced primarily by local tectonics, while global sea level changes had a greater impact on the southern Tethyan seaway and Paratethys basins. The depositional basins of the Tethyan seaway (southern Tethyan seaway, Paratethys Basin and Qom Basin) were probably related during the Burdigalian to Langhian and early Serravallian.

Early Jurassic intraplate extension in west-central Argentina constrained by U-Pb SHRIMP dating: Implications for the opening of the Neuquén basin

2020 ◽  
Vol 87 ◽  
pp. 278-302
Author(s):  
Lucas M. Fennell ◽  
Maximiliano Naipauer ◽  
Pablo Borghi ◽  
Lucía Sagripanti ◽  
Marcio Pimentel ◽  
...  
Keyword(s):  
Early Jurassic ◽  
Shrimp Dating ◽  
Central Argentina ◽  
West Central ◽  
Neuquen Basin ◽  
Neuquén Basin

First articulated stalked crinoids from the Mesozoic of South America: two new species from the Lower Cretaceous of the Neuquén Basin, west-central Argentina

2020 ◽  
Vol 94 (4) ◽  
pp. 716-733
Author(s):  
Darío G. Lazo ◽  
Graciela S. Bressan ◽  
Ernesto Schwarz ◽  
Gonzalo D. Veiga
Keyword(s):  
New Species ◽  
Lower Cretaceous ◽  
Carbonate Sediments ◽  
Exceptional Preservation ◽  
Central Argentina ◽  
West Central ◽  
Subaqueous Dunes ◽  
Neuquen Basin ◽  
Neuquén Basin ◽  
Slender Column

AbstractTwo new isocrinids are described from the Lower Cretaceous Agrio Formation of the Neuquén Basin, west-central Argentina. Isocrinus (Chladocrinus) covuncoensis new species is based on several beautifully preserved specimens from Valanginian beds of the Pilmatué Member. It is characterized by a small size, multiramose crown with six arm divisions, 240 arm tips, mostly isotomous branching, seven (or rarely eight) secundibrachials, smooth and stout column, short noditaxis, and pentalobate columnals. The species occurs in a 30 m thick interval of cross-bedded sandstones and mixed clastic-carbonate sediments that represent the migration of large, tidally influenced, subaqueous dunes developed in the offshore. Sudden burial of crinoids that dwelled on the dune toes and interdunes, possibly by the acceleration of the lee face migration, provided the exceptional preservation of specimens and thus this finding can be considered as a local crinoid Konservat Lagerstätte. Isocrinus (Chladocrinus) pehuenchensis new species is described from a single articulated specimen preserved in a silty calcareous concretion collected from a late Hauterivian concretion level of the Agua de la Mula Member. It is characterized by isotomous branching, eight or nine secundibrachials (IIBr), slender column ornamented with medial ridge of fine tubercles, interradius acuminated with fine tubercles on its tip, short noditaxis, and pentastellate columnals. It is associated with low-energy fall-out deposits in the offshore. The excellent state of preservation was due to an early cementation process by carbonate that enhanced lithification around the specimen.UUID: http://zoobank.org/4763ae70-9d0a-4015-b1c9-6a7ceeedfb1a

The gastropod family Aporrhaidae in the Lower Cretaceous of the Neuquén Basin, west-central Argentina

2014 ◽  
Vol 88 (6) ◽  
pp. 1222-1239 ◽  
Author(s):  
Cecilia S. Cataldo
Keyword(s):  
New Species ◽  
Lower Cretaceous ◽  
Single Species ◽  
Central Argentina ◽  
West Central ◽  
Neuquen Basin ◽  
Moderate Energy ◽  
Neuquén Basin ◽  
Water Carbonate

The gastropod fauna of the Lower Cretaceous of the Argentinian Neuquén Basin contains three aporrhaid species.Protohemichenopus neuquensisCamacho, 1953 is the most abundant, longest-lived, and most geographically widespread of the aporrhaids of this basin, and its protoconch and early teleoconch whorls were unknown until now. The new speciesDimorphosoma weaverifeatures convex to subtly angular spire whorls with opisthocyrt collabral ribs that are more prominent towards the mid-whorl, a bicarinate last whorl with small rounded nodes on the adapical carina, a simple, falcate labral wing which is more or less rectangular proximally and tapering and curving towards its distal end, and a short, straight rostrum.Tylostoma jaworskiiWeaver, 1931 is now placed inHarpagodes, and other previous, scattered, coeval records of this genus in the basin are now recognized as part of this single species. It is believed that whereasH. jaworskiipreferred shallower-water carbonate settings of low to moderate energy,P. neuquensisandD. weaverifavored siliciclastic to mixed clastic-carbonate environments, in deeper waters. In spite of its endemic elements, this aporrhaid association depicts a predominantly Tethyan influence.

Lower Cretaceous corals from the Agrio Formation, Neuquén Basin, west-central Argentina: Family Columastraeidae

2021 ◽  
pp. 104817
Author(s):  
Ricardo M. Garberoglio ◽  
Hannes Löser ◽  
Darío G. Lazo
Keyword(s):  
Lower Cretaceous ◽  
Central Argentina ◽  
West Central ◽  
Neuquen Basin ◽  
Neuquén Basin
Sign in / Sign up

Export Citation Format

Share Document