Results 11 to 20 of about 727 (161)

Marcasite at the Permian‐Triassic Transition

open access: yesGeophysical Monograph Series, Page 377-399., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Elena Lounejeva   +7 more
wiley  

+2 more sources

Distinguishing between Deep-Water Sediment Facies: Turbidites, Contourites and Hemipelagites

open access: yesGeosciences, 2020
The distinction between turbidites, contourites and hemipelagites in modern and ancient deep-water systems has long been a matter of controversy. This is partly because the processes themselves show a degree of overlap as part of a continuum, so that the
Dorrik Stow, Zeinab Smillie
doaj   +1 more source

Stratigraphy of the central parts of the Palaeoproterozoic Tampere Schist Belt, southern Finland: review and revision [PDF]

open access: yesBulletin of the Geological Society of Finland, 1998
The arc-type Palaeoproterozoic volcanic-sedimentary Tampere Schist Belt (TSB), close to the centre of the Svecofennian Orogen, comprises an E-W-striking major synform in its central parts.
Y. Kähkönen
doaj   +1 more source

Linear-stability analysis of plane beds under flows with suspended loads [PDF]

open access: yesEarth Surface Dynamics, 2023
Plane beds develop under flows in fluvial and marine environments; they are recorded as parallel lamination in sandstone beds, such as those found in turbidites.
K. Ohata, H. Naruse, N. Izumi
doaj   +1 more source

The Origin and 3D Architecture of a Km-Scale Deep-Water Scour-Fill: Example From the Skoorsteenberg Fm, Karoo Basin, South Africa

open access: yesFrontiers in Earth Science, 2021
Scours, and scour fields, are common features on the modern seafloor of deep-marine systems, particularly downstream of submarine channels, and in channel-lobe-transition-zones.
L. A. S. Hansen   +6 more
doaj   +1 more source

Grain-Size Analysis of Ancient Deep-Marine Sediments Using Laser Diffraction

open access: yesFrontiers in Earth Science, 2022
Grain-size analysis of siliciclastic sedimentary rocks provides critical information for interpreting flow dynamics and depositional environments in sedimentary systems and for analysing reservoir quality of sandstone.
Hannah L. Brooks   +3 more
doaj   +1 more source

Interaction between turbidity currents and a contour current – A rare example from the Ordovician of Shaanxi province, China

open access: yesGeologos, 2019
The silty top parts of graded turbidites of the Late Ordovician Pingliang Formation, which accumulated along the southern margin of the Ordos Basin (central China), have been reworked by contour currents.
Li Hua   +2 more
doaj   +1 more source

Petrography, geochemistry and depositional model of Ispikan Conglomerate, Makran Accretionary Prism, Southwest Pakistan

open access: yesKuwait Journal of Science, 2021
Depositional environments, provenance and tectonic settings of Ispikan group exposed in south west Makran, were revealed by lithofacies, petrography and geochemistry studies.
Muhammad Ahmed Farooqui   +4 more
doaj   +1 more source

The Bottom Current Sediments (Contourites) in the Upper Cretaceus Deep-Water Deposits in the Northeeastern Part of Žumberak (Croatia)

open access: yesGeologia Croatica, 2010
The Upper Cretaceous deep marine deposits in NE parts of Žumberakcontain sediments deposited by bottom currents - muddy, sandy andsandy-gravelly contourites. The complete (negative-positive) sequencesand incomplete (negative-positive) sequences have been
Ervin Mrinjek
doaj   +1 more source

Supercycle in great earthquake recurrence along the Japan Trench over the last 4000 years

open access: yesGeoscience Letters, 2018
On the landward slope of the Japan Trench, the mid-slope terrace (MST) is located at a depth of 4000–6000 m. Two piston cores from the MST were analyzed to assess the applicability of the MST for turbidite paleoseismology and to find out reliable ...
Kazuko Usami   +3 more
doaj   +1 more source

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