A coarse‐grained basin floor turbidite system – the Jurassic Los Molles Formation, Neuquen Basin, Argentina

Sedimentology ◽  
2020 ◽  
Vol 67 (7) ◽  
pp. 3809-3843
Author(s):  
Gabriel Giacomone ◽  
Cornel Olariu ◽  
Ron Steel ◽  
Moonsoo Shin
Keyword(s):  
Coarse Grained ◽  
Neuquen Basin ◽  
Basin Floor ◽  
Turbidite System ◽  
Neuquén Basin

The origin and significance of convolute lamination and pseudonodules in an ancient deep-marine turbidite system: From deposition to diagenesis

2020 ◽  
Vol 90 (5) ◽  
pp. 480-493
Author(s):  
Omar N. Al-Mufti ◽  
R. William C. Arnott
Keyword(s):  
Isotope Composition ◽  
Coarse Grained ◽  
Intergranular Porosity ◽  
Carbonate Cement ◽  
Windermere Supergroup ◽  
Basin Floor ◽  
Turbidite System ◽  
Sediment Deformation ◽  
General Transport ◽  
Marine Basin

ABSTRACT Soft-sediment deformation structures, like convolute lamination and pseudonodules, are common in deep-marine turbidites, but details of their origin and timing of formation remain a source of debate. Deep-marine basin-floor deposits of the Neoproterozoic Upper Kaza Group (Windermere Supergroup) crop out superbly in the Castle Creek study area and provide an ideal laboratory to investigate these aspects in convolute-laminated pseudonodules, and also how that deformation influenced later diagenesis. Pseudonodules consist of well-sorted, matrix-poor, upper medium- to coarse-grained, planar-stratified or cross-stratified sandstone that are underlain and overlain by comparatively more poorly sorted, matrix-rich, graded sandstone of similar grain size. Deposition of the stratified pseudonodules is interpreted to have occurred during the same event that deposited the graded sandstone, albeit during a period of general transport bypass, whereby isolated, shallow, seafloor depressions became filled with well-sorted, stratified sand. As stratified sand accumulated the depressions slowly subsided until a critical thickness had built up and exceeded the load-bearing capacity of the substrate composed of graded sand. This destabilized the surface separating the two layers and resulted in the stratified unit foundering, and in some cases becoming completely enveloped by, the upward-displaced lower-density substrate. Surprisingly, despite the deformed macroscopic character of the stratified sediment, primary grain fabric, including intergranular porosity up to 40%, was preserved and influenced early diagenesis, which, owing to dispersed phosphate cement and depleted carbon isotope composition of the pervasive carbonate cement, would have begun very near the sediment–water interface. Importantly also, pseudonodules are common in basin-floor deposits but comparatively rare in continental-slope strata. Expanding flow conditions over the basin floor would have promoted grain settling, and in turn development of a more stably (density) stratified flow structure. Ultimately this resulted in higher local rates of sedimentation on the basin floor and the accumulation of a substrate more prone to later liquidization.

3D Seismic Petrophysical Evaluation of Complex Clastic-Carbonate Sequences in the Neuquen Basin, Argentina. A Case Study

2009 ◽  
Author(s):  
Pablo Andres Borghi ◽  
Erick Raciel Alvarez ◽  
Jaume Hernandez ◽  
Rafael Vela ◽  
Marco Antonio Vasquez ◽  
...  
Keyword(s):  
3D Seismic ◽  
Neuquen Basin ◽  
Neuquén Basin ◽  
Petrophysical Evaluation

FILLING THE GAP: NEW TITHONIAN-EARLY CRETACEOUS DATA FROM THE NEUQUEN BASIN, ARGENTINE ANDES

2018 ◽  
Author(s):  
Beatriz Aguirre-Urreta ◽  
◽  
Mathieu Martinez ◽  
Marina Lescano ◽  
Mark Schmitz ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Neuquen Basin ◽  
Neuquén Basin

Sequence-stratigraphic study of Cuyo Group in the Agua del Cajón Block, Neuquén Basin, Argentina

2021 ◽  
pp. 103373
Author(s):  
Alberto R. Gutiérrez Pleimling ◽  
Alfredo Ambrosio ◽  
Carlos Gómez ◽  
Gabriela Bustos ◽  
José M. González ◽  
...  
Keyword(s):  
Sequence Stratigraphic ◽  
Neuquen Basin ◽  
Neuquén Basin
Sign in / Sign up

Export Citation Format

Share Document