Argillite - an overview | ScienceDirect Topics
The mélange argillite matrix has yielded Lower Eocene fossils, but also with reworked Upper Cretaceous coccoliths (Tan, 1979). The following forams indicate a Lower Eocene age: Ammodiscus sp. Bolivina sp.; Praeglobolulimina pupoides (d'Orbigny); Globigerina gravelli Bronnimann and Globigerina linaperta Finlay.
Argillite - an overview | ScienceDirect Topics
The range of K Z-hydraulic (K Z determined using hydraulic methods) at the same formation and in the same area can be as wide as seven orders of magnitude (see Otway Basin, Australia and Toarcian argillite, France, in Fig. 2 and Table 2), whereas the range of K Z-chemistry (K Z determined applying Darcy’s Law using V estimated with chemical ...
Orogenic gold in the Blue Mountains, eastern Oregon, USA
Mar 1, 2023 · The overlapping wedges could be A) thrust-bounded slices of the mechanically strong siliceous unit within the argillite sequence surrounded by strongly contorted, fine, and mechanically weak argillite, and/or B) pinch-and-swell features produced during original deposition of the argillite interbeds (as described by Brooks et al., 1982).
Permeability of macro-cracked argillite under confinement: Gas …
Jan 1, 2007 · Argillite is considered a privileged candidate for long term nuclear waste storage. Yet argillite rock drilling often induces surface cracks that locally modify its permeability. This phenomenon located in a so-called Excavation Damaged Zone (EDZ) is of importance since permeability increase means lesser confinement capacity of the argillite rock.
Coupled THMC models for bentonite in an argillite repository for ...
Nov 29, 2017 · This is of particular importance for an argillite repository, because argillite has relatively lower heat conductivity. All disposal concepts throughout the world, despite their differences in design concepts, commonly impose an upper temperature limit of about 100 °C ( Hicks et al., 2009 ).
Experimental investigation on the effects of confining pressure and ...
Nov 1, 2023 · Argillite is a complex heterogeneous material, in which the initial state (e.g., micro-fissures and cracks) and the orientation of these features has a significant impact on gas transport properties. In addition, the clay-water interaction during saturation results in adsorption swelling, further changing the microstructure of the material.
Thermal resistance of argillite-based alkali-activated materials. Part ...
Sep 15, 2018 · Indeed, Af argillite presents two type of carbonates (dolomite and calcite) that decompose during the firing, releasing higher amounts of calcium and magnesium that were available to react. In the presence of the Ac argillite, only calcium issued from calcite decomposition is available during the thermal treatment [18].
A MAS-NMR analysis of 29Si, 27Al and 1H on the temperature's …
Oct 15, 2024 · The argillite-based sample S 0.8 A650 1 displays an increase of the percentage of amorphous network from (1 % at 20°C) to (11 % at 80°C), a closer value to the estimated 20 %. Again, a decrease of the contribution area at 5 ppm from 30% to 23% is observed, accompanied with an increase by a factor of 2 for the band of M-OH at 3.80 ppm.
Redox-sensitive trace metal hyper-enrichment in ... - ScienceDirect
Dec 5, 2023 · The up to 7-m-thick Alum Shale beds that occur in the northern Baltic Palaeobasin in Estonia and NW Russia, locally known as graptolite argillite (GA), are biostratigraphically of Early Ordovician age (Tremadocian, ca. 484 Ma; Andersson et al., 1985; Kaljo et al., 1986; Kaljo and Viira, 1989).
Corrosion processes of carbon steel in argillite: Galvanic effects ...
Nov 10, 2015 · The pore water of the argillite formation of the waste disposal is mainly characterized by the presence of carbonate and chloride ions [2], [3]. In presence of carbonate species, different corrosion products can be formed, as illustrated by the various studies of archaeological iron artifacts performed to predict long term corrosion in anoxic ...