scholarly journals Supplemental Material: Authigenic berthierine and incipient chloritization in shallowly buried sandstone reservoirs: Key role of the source-to-sink context

2021 ◽  
Author(s):  
Maxime Virolle ◽  
Benjamin Brigaud ◽  
et al.
Keyword(s):  
Clay Mineral ◽  
Mineralogical Composition ◽  
Well Location ◽  
Source To Sink ◽  
Sample Depth ◽  
Sandstone Reservoirs

Table S1 displaying sample description and petrographical/mineralogical composition (sample list, well location projection WGS84, sample depth, petrographical and clay mineral quantifications).

scholarly journals Supplemental Material: Authigenic berthierine and incipient chloritization in shallowly buried sandstone reservoirs: Key role of the source-to-sink context

2021 ◽  
Author(s):  
Maxime Virolle ◽  
Benjamin Brigaud ◽  
et al.
Keyword(s):  
Clay Mineral ◽  
Mineralogical Composition ◽  
Well Location ◽  
Source To Sink ◽  
Sample Depth ◽  
Sandstone Reservoirs

Table S1 displaying sample description and petrographical/mineralogical composition (sample list, well location projection WGS84, sample depth, petrographical and clay mineral quantifications).

Authigenic berthierine and incipient chloritization in shallowly buried sandstone reservoirs: Key role of the source-to-sink context

2021 ◽  
Author(s):  
Maxime Virolle ◽  
Benjamin Brigaud ◽  
Daniel Beaufort ◽  
Patricia Patrier ◽  
Eid Abdelrahman ◽  
...  
Keyword(s):  
Clay Mineral ◽  
Main Process ◽  
Paris Basin ◽  
Clay Particles ◽  
Deep Well ◽  
Source To Sink ◽  
Quartz Cement ◽  
Sandstone Reservoirs

Chlorite is recognized worldwide as a key mineral that inhibits the development of quartz cement in deeply buried sandstone reservoirs. Iron-rich chlorite is mainly formed by the transformation of a precursor clay mineral; however, few studies have focused on the early stages before the crystallization of chlorite. This study analyzed shallowly buried (400−1000 m) coastal sandstones from within the Wealden Group of the Paris Basin. Berthierine, a 7 Å trioctahedral clay mineral belonging to the serpentine group, approximatively with same chemistry as chlorite but a different crystal structure, has been identified in a 900-m-deep well but not in a 400−600-m-deep well. Berthierine has mainly been observed as clay coatings around detrital grains with a typical honeycomb texture. Nanopetrographic observations suggest that the honeycomb textural organization of the clay particles found in deeper buried sandstone reservoirs (>1500 m) is acquired from a berthierine precursor at shallow depths. However, small amounts of quartz overgrowths are observed on the surface of detrital grains at shallow depths and low temperature (below 40 °C), and it is believed that precursor berthierine coatings are primarily responsible for the inhibition of quartz overgrowths before Fe-rich chlorite is formed. This suggests that the key mineral primarily controlling the reservoir quality of deeply buried sandstone reservoirs is berthierine rather than iron-rich chlorite, which challenges the commonly accepted assertion that chlorite coating is the main process that inhibits quartz overgrowths. The source-to-sink context of the Paris Basin during the Early Cretaceous was decisive with respect to the supply of sands and berthierine clay precursors (in particular kaolinite and iron-rich, hydroxy-interlayered clay minerals) to the center of the basin.

Mineralogy of agglutinated benthic foraminifera; implications for paleo-environmental reconstructions

2008 ◽  
Vol 179 (6) ◽  
pp. 583-592 ◽  
Author(s):  
Eric Armynot du Chatelet ◽  
Philippe Recourt ◽  
Vincent Chopin
Keyword(s):  
Grain Size ◽  
Benthic Foraminifera ◽  
Tidal Marsh ◽  
Environmental Parameters ◽  
Mineralogical Composition ◽  
Test Construction ◽  
Taxonomic Composition ◽  
Tidal Elevation ◽  
Sediment Grain Size

Abstract Benthic foraminifera of recent salt marsh environments are often dominated by species with an agglutinated test. The grains used for test construction by these foraminifera are collected from their surrounding environment. In this study we investigate the role of sediment grain size and mineralogical composition for richness, population density and taxonomic composition of agglutinating foraminifera. Foraminifera from 15 stations of the tidal marsh of the Canche estuary (Pas-de-Calais, France) were studied. The species richness depends on the grain size of the sediment, whereas the density is not related to sediment grain size. The distribution of foraminifera species throughout the tidal marsh may depend on many environmental parameters such as OM as well as tidal elevation, already largely discussed in literature. The mineralogical composition of the agglutinated grains in Trochammina inflata and Arenoparrella mexicana is very different from that of sediment; the composition of Jadammina macrescens is generally different from that of the sediment with some exceptions, and in Miliammina fusca, Paratrochammina haynesi and Remaneica plicata the mineralogical compositions are similar to those of the sediment. The studied species may be able to select their preferred grains based upon composition even if a particular mineral is scarce in the sediment.

The role of reactive surface sites and complexation by humic acids in the interaction of clay mineral and iron oxide particles

2004 ◽  
Vol 35 (3) ◽  
pp. 257-267 ◽  
Author(s):  
Etelka Tombácz ◽  
Zsuzsanna Libor ◽  
Erzsébet Illés ◽  
Andrea Majzik ◽  
Erwin Klumpp
Keyword(s):  
Iron Oxide ◽  
Clay Mineral ◽  
Humic Acids ◽  
Iron Oxide Particles ◽  
Surface Sites ◽  
Reactive Surface ◽  
Oxide Particles

scholarly journals A WRKY transcription factor, TaWRKY42-B, facilitates initiation of leaf senescence by promoting jasmonic acid biosynthesis

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Ming-Ming Zhao ◽  
Xiao-Wen Zhang ◽  
Yong-Wei Liu ◽  
Ke Li ◽  
Qi Tan ◽  
...  
Keyword(s):  
Leaf Senescence ◽  
Expression Profiles ◽  
Functional Characterization ◽  
Wrky Transcription Factor ◽  
Positive Role ◽  
Environmental Signals ◽  
Source To Sink ◽  
Age Dependent ◽  
Functional Investigation

Abstract Background Leaf senescence comprises numerous cooperative events, integrates environmental signals with age-dependent developmental cues, and coordinates the multifaceted deterioration and source-to-sink allocation of nutrients. In crops, leaf senescence has long been regarded as an essential developmental stage for productivity and quality, whereas functional characterization of candidate genes involved in the regulation of leaf senescence has, thus far, been limited in wheat. Results In this study, we analyzed the expression profiles of 97 WRKY transcription factors (TFs) throughout the progression of leaf senescence in wheat and subsequently isolated a potential regulator of leaf senescence, TaWRKY42-B, for further functional investigation. By phenotypic and physiological analyses in TaWRKY42-B-overexpressing Arabidopsis plants and TaWRKY42-B-silenced wheat plants, we confirmed the positive role of TaWRKY42-B in the initiation of developmental and dark-induced leaf senescence. Furthermore, our results revealed that TaWRKY42-B promotes leaf senescence mainly by interacting with a JA biosynthesis gene, AtLOX3, and its ortholog, TaLOX3, which consequently contributes to the accumulation of JA content. In the present study, we also demonstrated that TaWRKY42-B was functionally conserved with AtWRKY53 in the initiation of age-dependent leaf senescence. Conclusion Our results revealed a novel positive regulator of leaf senescence, TaWRKY42-B, which mediates JA-related leaf senescence via activation of JA biosynthesis and has the potential to be a target gene for molecular breeding in wheat.

scholarly journals Localized and chaotic folding: the role of axial plane structures

2012 ◽  
Vol 370 (1965) ◽  
pp. 1966-2009 ◽  
Author(s):  
Bruce E. Hobbs ◽  
Alison Ord
Keyword(s):  
Selection Process ◽  
Reaction Force ◽  
Mineralogical Composition ◽  
Axial Plane ◽  
Nonlinear Behaviour ◽  
Periodic Reaction ◽  
Spatially Periodic ◽  
Reaction Forces ◽  
Softening Process

Most natural fold systems are not sinusoidal in profile. A widely held view is that such irregularity derives solely from inherited initial geometrical perturbations. Although, undoubtedly, initial perturbations can contribute to irregularity, we explore a different (but complementary) view in which the irregular geometry results from some material or system softening process. This arises because the buckling response of a layer (or layers) embedded in a weaker matrix is controlled in a sensitive manner by the nature of the reaction forces exerted by the deforming matrix on the layer. In many theoretical treatments of the folding problem, this reaction force is assumed to be a linear function of some measure of the deformation or deformation rate. This paper is concerned with the influence of nonlinear reaction forces such as arise from nonlinear elasticity or viscosity. Localized folds arising from nonlinearity form in a fundamentally different way than the Biot wavelength selection process. As a particular example of nonlinear behaviour, we examine the influence of axial plane structures made up of layers of different mineralogy formed by chemical differentiation processes accompanying the deformation; they are referred to as metamorphic layering . The alternating mineralogical composition in the metamorphic layers means that the embedding matrix exerts a reaction force on the folded layers that varies not only with the deflection or the velocity of deflection of the layer, but also in a periodic manner along the length of the folded layers. The influence of this spatially periodic reaction force on the development of localized and chaotic folding is explored numerically.

The role of sample depth in storing chilled rainbow trout (Salmo gairdneri) semen under oxygen

Aquaculture ◽  
1987 ◽  
Vol 61 (3-4) ◽  
pp. 275-279 ◽  
Author(s):  
J. Stoss ◽  
L. Geries ◽  
W. Holtz
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Sample Depth
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