Relevant bibliographies by topics / Authigenic clay

Academic literature on the topic 'Authigenic clay'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Authigenic clay.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Authigenic clay"

1

Pozo, Manuel, and José Calvo. "An Overview of Authigenic Magnesian Clays." Minerals 8, no. 11 (November 9, 2018): 520. http://dx.doi.org/10.3390/min8110520.

Full text
Abstract:
Clay authigenesis mostly concerns: (a) the formation of clays by direct precipitation from solution, called “neoformation” and (b) development of clays by transformation of precursor minerals. Precipitation from solution implies that a new mineral structure crystallizes, so that a prior mineral structure is not inherited. Transformation of precursor detrital minerals, a process also termed “neoformation by addition”, can be conducted whether throughout precipitation on pre-existing natural surfaces or transformation and reaction on pre-existing surfaces. Both processes have been recognized as effective mechanisms in the formation of Mg-clays, which mostly include 2:1 clay minerals, such as talc-kerolite and Mg-smectites, as well as fibrous clays (sepiolite, palygorskite). Authigenic Mg-clay minerals occur in both modern and ancient marine and non-marine depositional environments, although formation of these clays in hydrothermal continental and seafloor settings must be also outlined. Most favourable conditions for the formation of Mg-clays on earth surface are found in evaporitic depositional environments, especially where parent rocks are enriched in ferromagnesian minerals. In these settings, Mg-clays are important constituent of weathering profiles and soils and can form thick deposits of significant economic interest. Based on this review of authigenic clay deposits, we propose three geochemical pathways, mainly related to continental environments, for the origin of authigenic Mg-clays: formation of Al-bearing Mg-clays (pathway 1), formation of Al-free Mg clays (pathway 2) and formation of sepiolite from other Mg-clay minerals (pathway 3).
APA, Harvard, Vancouver, ISO, and other styles
2

Setti, M., L. Marinoni, and A. López-Galindo. "Mineralogical and geochemical characteristics (major, minor, trace elements and REE) of detrital and authigenic clay minerals in a Cenozoic sequence from Ross Sea, Antarctica." Clay Minerals 39, no. 4 (December 2004): 405–21. http://dx.doi.org/10.1180/000985503540143.

Full text
Abstract:
AbstractThe mineralogy and geochemistry of the clay fraction of Victoria Land Basin (Ross Sea, Antarctica) sediments was investigated, to determine the origin of clay minerals and the features of authigenic smectite. The investigated core (CRP-3) is ~800 m long, mostly of Oligocene age. The clay fraction of the upper sequence consists of mica, chlorite and detrital smectite, while that of the central and lower part is largely made up of authigenic smectite. Authigenic smectites are ditrioctahedral, with a composition close to saponite, while detrital smectites such as Al-Fe beidellites are dioctahedral. Authigenic smectites have no illite mixed layers, show a higher degree of crystallization, higher MgO, Fe2O3, V, Cr, Co, Ni and Sc contents and lower SiO2, Al2O3, K2O, TiO2, Ba, Rb and Zr contents with respect to detrital clay minerals, and a clear depletion of LREE with respect to HREE. Authigenic smectite formed from the alteration of volcanic materials and clay minerals.
APA, Harvard, Vancouver, ISO, and other styles
3

Baiyegunhi, Temitope Love, Kuiwu Liu, Oswald Gwavava, and Christopher Baiyegunhi. "Impact of Diagenesis on the Reservoir Properties of the Cretaceous Sandstones in the Southern Bredasdorp Basin, Offshore South Africa." Minerals 10, no. 9 (August 27, 2020): 757. http://dx.doi.org/10.3390/min10090757.

Full text
Abstract:
The Cretaceous sandstone in the Bredasdorp Basin is an essential potential hydrocarbon reservoir. In spite of its importance as a reservoir, the impact of diagenesis on the reservoir quality of the sandstones is almost unknown. This study is undertaken to investigate the impact of digenesis on reservoir quality as it pertains to oil and gas production in the basin. The diagenetic characterization of the reservoir is based on XRF, XRD SEM + EDX, and petrographic studies of 106 thin sections of sandstones from exploration wells E-AH1, E-AJ1, E-BA1, E-BB1 and E-D3 in the basin. The main diagenetic processes that have affected the reservoir quality of the sandstones are cementation by authigenic clay, carbonate and silica, growth of authigenic glauconite, dissolution of minerals and load compaction. Based on the framework grain–cement relationships, precipitation of the early calcite cement was either accompanied or followed up by the development of partial pore-lining and pore-filling clay cements, particularly illite. This clay acts as pore choking cement, which reduces porosity and permeability of the reservoir rocks. The scattered plots of porosity and permeability versus cement + clays show good inverse correlations, suggesting that the reservoir quality is mainly controlled by cementation and authigenic clays.
APA, Harvard, Vancouver, ISO, and other styles
4

Bentz, Jennifer L., and Ronald C. Peterson. "Authigenic Phyllosilicates in Sand Layers from the Mudflats of Saline Lakes in the Northern Great Prairies, Saskatchewan." Canadian Mineralogist 60, no. 1 (December 6, 2021): 101–20. http://dx.doi.org/10.3749/canmin.1900065.

Full text
Abstract:
ABSTRACT The mudflats of saline lakes are amenable to authigenic clay formation due to the high ionic strength of the solutions driven by evaporative concentration and due to the fluctuating wet/dry cycles. However, the mudflats of saline lakes have received relatively little study given the challenges in sampling unstable sediments coupled with post-depositional alterations that make direct relationships to the climate difficult. In an effort to gain a better understanding of the authigenic phyllosilicates present, the mudflats of 17 sulfate-rich saline lake basins across southern Saskatchewan were sampled. The <2 μm fraction was separated from the sediments and analyzed utilizing X-ray diffraction (XRD), scanning electron microscopy, bulk chemical analysis via digestion and inductively coupled optical emission spectroscopy, and visible and near-infrared reflectance spectroscopy. The mudflat sediments were characterized as highly variable and were classified based on particle size into sediment classes A (clay-rich), B (unsorted till), and C (sand). Despite the high variability in sorting and thickness of the sedimentary layers, the phyllosilicates were distinctive within each class independent of the basin. Phyllosilicates in sediment class A were characterized by well-crystalline dioctahedral (Al) clays similar to the surrounding soils with smectite > illite > kaolinite > chlorite. Phyllosilicates from sediment class B displayed highly variable characteristics ranging between classes A and C. Clays from sediment class C were dominated by illite with decreasing proportions of smectite, kaolinite, and chlorite. The illite in the sand lenses was poorly formed, with broad reflections in the XRD patterns indicative of small crystallite size or high disorder, which is consistent with an authigenic nature. The clays in class C were rich in iron (Fe) and magnesium (Mg) and displayed lath-like morphologies common with authigenic illite forming in sandy porous sediments. The sand lenses of mudflats represent viable targets for finding authigenic clay minerals in detrital-rich sediments to use in understanding past climates on Earth and Mars.
APA, Harvard, Vancouver, ISO, and other styles
5

Sallstedt, Therese, Magnus Ivarsson, Henrik Drake, and Henrik Skogby. "Instant Attraction: Clay Authigenesis in Fossil Fungal Biofilms." Geosciences 9, no. 9 (August 24, 2019): 369. http://dx.doi.org/10.3390/geosciences9090369.

Full text
Abstract:
Clay authigenesis associated with the activity of microorganisms is an important process for biofilm preservation and may provide clues to the formation of biominerals on the ancient Earth. Fossilization of fungal biofilms attached to vesicles or cracks in igneous rock, is characterized by fungal-induced clay mineralization and can be tracked in deep rock and deep time, from late Paleoproterozoic (2.4 Ga), to the present. Here we briefly review the current data on clay mineralization by fossil fungal biofilms from oceanic and continental subsurface igneous rock. The aim of this study was to compare the nature of subsurface fungal clays from different igneous settings to evaluate the importance of host rock and ambient redox conditions for clay speciation related to fossil microorganisms. Our study suggests that the most common type of authigenic clay associated with pristine fossil fungal biofilms in both oxic (basaltic) and anoxic (granitic) settings are montmorillonite-like smectites and confirms a significant role of fungal biofilms in the cycling of elements between host rock, ocean and secondary precipitates. The presence of life in the deep subsurface may thus prove more significant than host rock geochemistry in directing the precipitation of authigenic clays in the igneous crust, the extent of which remains to be fully understood.
APA, Harvard, Vancouver, ISO, and other styles
6

Barker, W. W. "Bacterial Trace Fossils in Eocene Kaolin." Proceedings, annual meeting, Electron Microscopy Society of America 43 (August 1985): 238–39. http://dx.doi.org/10.1017/s0424820100118114.

Full text
Abstract:
Spheroidal electron-dense masses averaging two microns in diameter comprise up to 20% of a thin Eocene grey kaolin in the upper part of the Huber Fm. near Wrens, Georgia. TEM and SEM reveal that the microspheroids consist of tangentially oriented kaolinite platelets enclosing much finer, delicate intergrowths of secondary authigenic minerals.Many types of bacteria and algae produce mucopolysaccharidal exudates which can attach clay platelets. Clay-clad microorganisms are especially common in marine and estuarine environments, where high ionic strength compresses the electric double layer of kaolinite sufficiently for van der Waals forces to aid its attachment to exudates. Maclean and Smart found clay-clad prokaryotic cells in recent estuarine sediments. Avnimelech, et al. demonstrated mutual flocculation of algae and clay upon addition of electrolyte. Because the size and structure of the clay-clad microspheroids in the Eocene kaolin closely resembles the clay-clad bacteria in recent marine muds, they are interpreted as trace fossils of bacteria.
APA, Harvard, Vancouver, ISO, and other styles
7

Cuevas, Jaime, Ana Ruiz, Raúl Fernández, Daniel González-Santamaría, María Angulo, Almudena Ortega, Elena Torres, and María Turrero. "Authigenic Clay Minerals from Interface Reactions of Concrete-Clay Engineered Barriers: A New Perspective on Mg-Clays Formation in Alkaline Environments." Minerals 8, no. 9 (August 21, 2018): 362. http://dx.doi.org/10.3390/min8090362.

Full text
Abstract:
Artificial and singular geochemical environments are created around the engineered barrier systems (EBS) designed to isolate high level nuclear wastes in deep geological repositories. A concrete-bentonite interface takes place within the EBS and it builds a significant chemical gradient (pH), approximately from pH 8 (bentonite) to pH 12 (low alkali concrete), in a few millimetre thickness. This disequilibrium triggers dissolution and precipitation reactions and form a thin altered region. In this area, poorly ordered authigenic clay minerals, mainly hydrated magnesium silicates, are formed adjacent to hydrated calcium silicates and calcite precipitates adhered to the interface with concrete. This paper presents the development of this authigenic mineral layer comparing 6–18 months to 13 years interfaces. Scanning Electron Microscopy with Energy Dispersive X-ray spectroscopy (SEM-EDX) morphological and chemical characterization with the aid of ternary plots, X-ray diffraction (XRD) and infrared (IR) data show the young to old interface evolution from single brucite layers to stevensite-saponite silicates composition. Geochemical calculations indicate that this layer acts as a pH~11 buffer useful to minimize bentonite alteration and to favour the retention of amphoteric metal ions.
APA, Harvard, Vancouver, ISO, and other styles
8

Deocampo, Daniel M., and Joanne C. Tactikos. "Geochemical gradients and artifact mass densities on the lowermost Bed II eastern lake margin (~ 1.8 Ma), Olduvai Gorge, Tanzania." Quaternary Research 74, no. 3 (November 2010): 411–23. http://dx.doi.org/10.1016/j.yqres.2010.09.004.

Full text
Abstract:
AbstractBulk geochemistry of ~ 1.8 Ma lacustrine claystone at Olduvai Gorge, Tanzania, is controlled principally by the geochemistry of ultrafine (< 0.1 μm), authigenic clay minerals. Authigenic clays have an average structural formula of (Si3.83Al0.17)(Al0.43Fe0.49Mg0.84)(Na0.99K0.22Ca0.16)O10(OH)2; octahedral composition varies, with Mg/(Al + Fe) ranging from 0.7 to 2.3. These clay minerals have a complex history of interaction with saline, alkaline water, followed by secondary diagenetic reactions that leached Mg in freshwater paleoenvironments. Lateral variations in whole-rock and clay geochemistry show westward enrichment in Mg, from Mgoct = 0.6–1.6. This is consistent with persistence of saline, alkaline Paleolake Olduvai to the west, and the presence of groundwater wetlands and other freshwater paleoenvironments to the east. Stone artifact mass density also varies systematically across the basal Bed II deposits, ranging from 100.0 to 104.3 g of artifacts per cubic meter of excavated sediment. Significant correlation is found between clay geochemistry and the density of artifacts excavated from associated archeological trenches (r2 = 0.59, p < 0.01). This relationship supports models of hominin land use in which artifact use and discard is concentrated near freshwater paleoenvironments such as wetlands associated with surface and groundwater discharge. Independent paleoenvironmental proxies such as clay geochemistry allow quantitative hypothesis testing to improve our understanding of early hominin behavior and paleoecology.
APA, Harvard, Vancouver, ISO, and other styles
9

Polkowski, George R. "Degradation of Reservoir Quality by Clay Content, Unayzah Formation, Central Saudi Arabia." GeoArabia 2, no. 1 (January 1, 1997): 49–64. http://dx.doi.org/10.2113/geoarabia020149.

Full text
Abstract:
ABSTRACT Reservoirs in Central Saudi Arabia are important new sources of light sulfur-free crude oil. Development work on these wells has shown the adverse effect of authigenic clay minerals on their productivity or injectivity. The clay minerals may be affected during drilling of the well, during completion, during production, and/or injection. Kaolinite, chlorite, illite, and ordered and random mixed layer illite/smectite are commonly occurring authigenic clay minerals within the Permian Unayzah reservoir rock. As little as 2 weight percent clay causes permeability to be drastically reduced. Formation damage due to clay minerals results from: (1) swelling of smectite caused by injection water or drilling fluids of low salinity; (2) clay mineral migration and subsequent pore blockage; (3) precipitation of gelatinous pore-blocking iron hydroxides caused by the dissolution of chlorite by acid; (4) high water saturations; and (5) disaggregation of poorly consolidated parts of the reservoir into its component sand grains if the weak clay cements are disturbed. The implementation of clay control measures has resulted in increased production while minimizing formation damage.
APA, Harvard, Vancouver, ISO, and other styles
10

Tsirambides, A. E. "Detrital and authigenic minerals in sediments from the western part of the Indian Ocean." Mineralogical Magazine 50, no. 355 (March 1986): 69–74. http://dx.doi.org/10.1180/minmag.1986.050.355.10.

Full text
Abstract:
AbstractMineralogical and oxygen isotope analyses have been performed on nine western Indian Ocean core samples in order to distinguish the detrital from authigenic minerals in the sediments. Following the removal of carbonates, organic constituents and Fe and Mn oxides, the residue was separated into five size fractions, the principal minerals present being feldspar, quartz, clinoptilolite, and clay minerals.Oxygen isotope compositions for two samples reflect an authigenic origin for clinoptilolite by the submarine alteration of volcanic material. Oxygen isotope compositions of two separates (free from feldspar and clays) suggest a detrital origin for the quartz in this area. The same mode of origin is apparent for the other components too, except possibly for some smectite which may have formed authigenically.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Authigenic clay"

1

Rahman, Shaily. "Cosmogenic Silicon-32 reveals extensive authigenic clay formation in deltaic systems and constrains the marine silica budget." Thesis, State University of New York at Stony Brook, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10140185.

Full text
Abstract:

Cosmogenic 32Si (t1/2 ∼ 140 yrs) was used in a novel way to constrain the quantity of reactive Si storage and early diagenetic reactions of Si in the highly mobile deltaic sediments along the coast of French Guiana, representative of deposits along the ~1600 km Amazon–Guianas coastline downdrift of the Amazon delta. A sequential leach was developed to extract and purify SiO2 from different operational pools in large samples of surface sediments (0–10cm). This methodology, a hot 1% Na2CO3 leach followed by a hot 4M NaOH leach, was adapted from the existing leaches widely used to estimate biogenic silica (bSi) content in marine sediments, and ultimately to constrain the global oceanic Si budget. 32Si activity was determined in each pool via its daughter product 32P. Results from several sites in coastal mudbanks near Kourou and Sinnamary indicate no detectable 32Si activity in the bSi fraction, whereas 32Si was detected in the Si-NaOH fraction after removal of bSi. The lack of detectable activity in the 1% Na2CO3 leach and its detection in the NaOH fraction (0.4–2.5 dpm) indicate that the method widely used to determine bSi content recovers only a minor fraction of the originally deposited reactive bSi in these deposits. The results are consistent with rapid alteration of biogenic silica and clay authigenesis or reverse weathering. They also demonstrate that the current estimate of biogenic silica storage in tropical deltaic sediments is significantly underestimated. Assuming an initial diatom specific activity range of ∼5–40 dpm/kg SiO 2, the 32Si activity in the NaOH fraction corresponds to a reactive Si storage of ∼150–18,000 µmol Si/g sediment. This magnitude is more consistent with estimates of reactive Si (ΣSi hr) storage in the Amazon delta based on modified operational leach techniques that target poorly crystalline clays and with diagenetic modeling of pore water K+, F−, and Si(OH) 4, though these modified leaches also appear to underestimate the amount of reactive Si stored along this system. To directly confirm whether these modified operational extractions underestimate reactive Si storage, a sequential extraction methodology was also developed to first isolate 32Si activity in the ΣSihr fraction (0.1N HCl followed by 1% Na 2CO3) and then extract any remaining 32Si from the residual fraction using 4M NaOH.

Sediment from 2 stations in the Gulf of Papua, Papua New Guinea, 1 station in the northern Gulf of Mexico near the Southwest Pass, and 1 station in Long Island Sound (Smithtown Bay) were also extracted for 32Si in the bSi fraction as well as the residual fraction after removal of bSi. Bulk 32Si activities in the residual fractions in the Gulf of Papua (0.5–0.7 dpm/kg sediment) were used to extrapolate Si storage in the outer topset and forset of the clinoform delta.

32Si activity was detected in the both the bSi (0.21 ± 0.04 dpm/kg sediment) and the residual fraction (0.44 ± 0.08 dpm/kg sediment) from the site in the Gulf of Mexico. A Si burial rate using the 32Si activity in the bSi fraction (assuming an activity of 15dpm/kg in starting Si materials) of 0.004Tmol/y was calculated over approximately 5000 km2 of the delta, whereas the burial rate calculated using the Si content in this same fraction from a classic bSi leach, was ∼0.006Tmol/y. Adding the Si burial rate using the 32Si activity in the residual fraction (0.008Tmol/y) yielded a total storage per year of 0.012Tmol Si, ∼10% of the total Si inputs (dissolved and amorphous Si) from the Mississippi-Atchafalaya river system. 32Si activity was also detected in the residual fraction (0.53 ± 0.08 dpm/kg sediment) after removal of ΣSi hr and using this activity yielded similar calculated rates of Si burial (∼0.01 Tmol/y).

In Smithtown Bay, Long Island Sound, 32Si activity was also detected in both the bSi (0.15 ± 0.05 dpm/kg sediment) and the residual (0.4 ± 0.2 dpm/kg sediment) fractions from the site in Smithtown Bay, Long Island Sound, yielding a total Si storage estimate (assuming an activity of 15 dpm/kg in starting Si materials) of 1.6 × 10−3 Tmol/y over the entire Sound, comparable to estimates of Si storage calculated using the Si content in the classic bSi (1.1 × 10 −3 Tmol/y) and the classic ΣSihr (2.2 × 10−3 Tmol/y) leaches. It appears that reverse weathering is an important sink of Si in these deposits and that classic bSi or ΣSi hr leaches can underestimate Si storage in these system by two to four-fold. (Abstract shortened by UMI.)

APA, Harvard, Vancouver, ISO, and other styles
2

Nikonova, Elena L. "Authigenic Clay Formation and Diagenetic Reactions, Lake Magadi, Kenya." 2016. http://scholarworks.gsu.edu/geosciences_theses/88.

Full text
Abstract:
The purpose of this study is to understand mineral diagenesis authigenic mineral and the effect of climate on mineral of Pleistocene-Holocene sediment deposits in the Southern Kenya Rift. Lake Magadi unique geologic settings are characterized by extreme alkalinity and high silica activities. The mineralogical analysis was achieved by X-Ray diffraction (XRD) and Scanning Electron Microscopy (SEM) applications. The bulk mineralogy (quartz, halite, calcite) is the same on all localities due to similar volcaniclastics compositions throughout the Kenya Rift Valley. The clay mineralogy significantly differ among the groups of sample localities. The differences reflect different tectonic settings and ambient climate regime. In humid climate at higher elevation detrital clay minerals are abundant (feldspars, phillipsite). At lower elevation like Lake Magadi, the clay fractions dominated by authigenic minerals (zeolites and silicate minerals found with zeolites). These results show the potential of clay minerals as terrestrial climate proxies.
APA, Harvard, Vancouver, ISO, and other styles
3

Simpson, Alexandra M. "Authigenic Clays used as Terrestrial Climate Proxies: Locality 80, Olduvai Gorge, Tanzania." 2016. http://scholarworks.gsu.edu/geosciences_theses/91.

Full text
Abstract:
Authigenic clays are potential proxies for paleoclimate change when formed under saline conditions. Between 1.9 -1.7 mya, Olduvai was a closed-hydrologic basin into which Al- and Fe- rich detrital clays were transported from surrounding soils. Authigenic Mg-rich smectite formed within the basin due to chemical alteration in alkaline and saline conditions. 40 samples were chosen from a stratigraphic section in the center of the paleolake and analyzed to characterize the geochemical facies of the material using XRD, EMPA, and FTIR. ~70% of samples were Mg-rich with clay d060 XRD peaks between 1.506-1.523Å. EMPA indicated (Al2O3 + Fe2O3)/MgO ratios ranged from 0.2-4.8, 21 had ratios >1.0, indicating higher (Al2O3 + Fe2O3) content. These clay data correlated with bulk XRF data, indicating diagenetic controls on bulk composition. Therefore, bulk geochemistry can potentially indicate paleoclimate change when influenced by Mg-rich phyllosilicate formation.
APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Authigenic clay"

1

B, Hatfield D., and Geological Survey (U.S.), eds. Mineral and chemical compositions of authigenic clay minerals in the Morrison Formation, southern San Juan Basin, New Mexico. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Authigenic clay mineral distribution, Lower Tuscaloosa Formation, southwest Mississippi: Impact on sandstone reservoir quality : North Hustler field area : final report. University, Miss: Mississippi Mineral Resources Institute, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Authigenic clay"

1

Calvo, J. P., M. M. Blanc-Valleron, J. P. Rodríguez-Arandía, J. M. Rouchy, and M. E. Sanz. "Authigenic Clay Minerals in Continental Evaporitic Environments." In Palaeoweathering, Palaeosurfaces and Related Continental Deposits, 129–51. Oxford, UK: Blackwell Publishing Ltd., 2009. http://dx.doi.org/10.1002/9781444304190.ch5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

HOWARD, JAMES J. "INFLUENCE OF AUTHIGENIC-CLAY MINERALS ON PERMEABILITY." In Origin, Diagenesis, and Petrophysics of Clay Minerals in Sandstones, 257–64. SEPM (Society for Sedimentary Geology), 1992. http://dx.doi.org/10.2110/pec.92.47.0257.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Warren, Edward A. "Chemical Composition and Variation of Authigenic Illite, Rotliegende Sandstone (Permian), Southern North Sea." In Electron–Optical Methods in Clay Science. Clay Minerals Society, 1990. http://dx.doi.org/10.1346/cms-wls-2.8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

MORAES, MARCO A. S., and LUIZ F. DE ROS. "DEPOSITIONAL, INFILTRATED AND AUTHIGENIC CLAYS IN FLUVIAL SANDSTONES OF THE JURASSIC SERGI FORMATION, RECÔNCAVO BASIN, NORTHEASTERN BRAZIL." In Origin, Diagenesis, and Petrophysics of Clay Minerals in Sandstones, 197–208. SEPM (Society for Sedimentary Geology), 1992. http://dx.doi.org/10.2110/pec.92.47.0197.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

BURLEY, STUART D., and JOE H. S. MacQUAKER. "AUTHIGENIC CLAYS, DIAGENETIC SEQUENCES AND CONCEPTUAL DIAGENETIC MODELS IN CONTRASTING BASIN-MARGIN AND BASIN-CENTER NORTH SEA JURASSIC SANDSTONES AND MUDSTONES." In Origin, Diagenesis, and Petrophysics of Clay Minerals in Sandstones, 81–110. SEPM (Society for Sedimentary Geology), 1992. http://dx.doi.org/10.2110/pec.92.47.0081.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

CROSSEY, LAURA J., and DANIEL LARSEN. "AUTHIGENIC MINERALOGY OF SANDSTONES INTERCALATED WITH ORGANIC-RICH MUDSTONES: INTEGRATING DIAGENESIS AND BURIAL HISTORY OF THE MESAVERDE GROUP, PICEANCE BASIN, NW COLORADO." In Origin, Diagenesis, and Petrophysics of Clay Minerals in Sandstones, 125–44. SEPM (Society for Sedimentary Geology), 1992. http://dx.doi.org/10.2110/pec.92.47.0125.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

"CHAPTER EIGHTEEN Linking Sediment Processes to Global Elemental Cycles: Authigenic Clay Mineral Formation and Reverse Weathering." In Geochemistry of Marine Sediments, 509–16. Princeton University Press, 2007. http://dx.doi.org/10.1515/9780691216096-020.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Demina, L. L., D. F. Budko, N. V. Politova, T. N. Alexeeva, E. A. Novichkova, A. S. Solomatina, and R. A. Aliev. "Geochemical fractions and indicators of sedimentation conditions in the Barents sea." In THE BARENTS SEA SYSTEM, 431–44. Shirshov Institute of Oceanology Publishing House, 2021. http://dx.doi.org/10.29006/978-5-6045110-0-8/(31).

Full text
Abstract:
Research results of geochemical fractions and distribution pattern of the major and trace elements in the sediment cores of the Barents Sea are presented. In the sediment core AMK- 5193, located in the central part of the sea, Al, Cr and Ni were detected predominantly in the lithogenic form (75−97% of the total content) throughout the core. A large or a noticeable portion (from 65% to 30% from total contents) of Pb, Cd, Cu, Ni, Co, Mn, and As was found to be accumulated due to hydrogenous processes, such as adsorption on amorphous Fe-Mn oxyhydroxides and clay particles. In the uppermost oxidized layer (0−6 cm) of St. AMK-5193, where the most intensive exchange processes between the solid and liquid phases of bottom sediments happen, a significant increase in the proportion of geochemically mobile fraction of most metals was found. In this part of the core, the maximum content of Fe and Mn in the form of authigenic oxy-hydroxides which serve an effective sorbent of most trace elements, including heavy metals, was recorded. At st. 5194, the downcore rythmic covariation of the Si/Al, Ti/Al and Fe/Al ratios reflecting contribution of terrigenous matrix, as well as Al/Ca ratio (indicator of physical and chemical weathering) was revealed. Moreover, the Al/Ca ratio exhibited an asynchronous change with the Si/Al and Fe/Al ratios. Also, the downcore variation in the Ti/Al ratio was opposite to that of Mn/Fe (an indicator of geochemically mobile fraction). Variation of the Ti/Zr ratio, reflecting the range of aerosol transport of clastic material, is weakly expressed in the AMK-5194 core, which supports the proximity of the terrigenous source.
APA, Harvard, Vancouver, ISO, and other styles
9

Thomas, Fabien, and Armand Masion. "27Al NMR Study of the Hydrolysis and Condensation of Organically Complexed Aluminum." In Nuclear Magnetic Resonance Spectroscopy in Environment Chemistry. Oxford University Press, 1997. http://dx.doi.org/10.1093/oso/9780195097511.003.0015.

Full text
Abstract:
Aluminum is the most abundant metal of the Earth’s crust, of which it represents approximately 8%, ranking after oxygen and silicon. It exists mainly as oxides. In terrestrial environments, aluminum commonly exists as secondary (authigenic) hydroxide or aluminosilicate minerals, mainly clays. These minerals are highly insoluble at neutral pH. However, aluminum occurs in detectable amounts in natural waters, due to leaching of the soil minerals in acidic conditions. Soil acidity may have a natural origin, such as an acidic (silicic) mother rock, melted snow, dissolved carbonic acid, or biologically generated organic acids. During the past two decades, it has been demonstrated that one of the major origins of increased aluminum mobilization and transport in forested soils is introduction of strong acid through atmospheric sulfur and nitrogen deposition. It has also been shown that aqueous aluminum is the biogeochemical link between atmospheric pollution and damage caused to tree roots and aquatic organisms such as plankton, crustaceans, insects, and fish. Biological studies have shown that the different aluminum species exhibit various toxicities: the most toxic are the monomeric and the polynuclear species; complexation with organic acids results in low toxicity. The significance of aluminum to human health has long been regarded as negligible. There is a possible link between high-level aluminum contamination by renal dialysis or hemodialysis, and neurodegenerative health disorders such as Parkinson’s or Alzheimer’s diseases, but the part played by aluminum is not clear. However, since aluminum salts are used on an industrial level as coagulants and flocculants in water treatment, the aluminum concentration and speciation in drinking water deserve careful monitoring. Because of the specific toxicity of the aluminum species, there has been considerable concern in the past two decades over the speciation of aqueous aluminum present in soils and aquatic systems. To this end, several techniques have been developed in order to partition the aluminum species. The most common among them are chromatographic separation and categorization methods such as timed ferron reaction, and computational methods derived from thermodynamic equilibrium constants. However, significant discrepancies between the results have been noticed, and attributed to the dramatic interference of organic and inorganic anions in the Al fractionation.
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Authigenic clay"

1

Hashemi, Abolfazl, Sara Borazjani, Bryant Dang-Le, Grace Yin Loi, Cuong Nguyen Cao, Alex Badalyan, and Pavel Bedrikovetsky. "Formation Damage by Fines Breakage and Migration." In SPE International Conference and Exhibition on Formation Damage Control. SPE, 2022. http://dx.doi.org/10.2118/208810-ms.

Full text
Abstract:
Abstract Fines migration is one of the most drastic causes for formation damage - the detached clays migrate and impairs well productivity. Two types of damaging clays are encountered in petroleum reservoirs: authigenic clays that grew on the grain surfaces during geological times, and detrital clays that have been broken off the grains by local stresses. Detailed laboratory and mathematical modelling have been carried out for detrital-clay formation damage. The theory for formation damage by authigenic clays is not available. The aim of this work is the development of a laboratory procedure to estimate formation damage by authigenic clays and the derivation of a mathematical model for core scale. We performed two test of corefloods using Castlegate core samples. In the first test, injection rate increased in a stepwise manner up to 100 mL/min and in the second one up to a 200mL/min to make sure both detrital and authigenic particles are detached. The pressure drop across the overall core and the concentration of the fine in the produced fluid have been measured. We have derived equations for authigenic-fines detachment using the beam theory and the von Mises failure criteria to obtain analytical solutions for linear system of equations. Matching the laboratory data by the analytical model allows determining the percentage of authigenic and detrital clays in the cores. The laboratory data exhibit a good match with the mathematical model for the two coreflood tests. The non-monotonic change of the concentration of the detached fine, with the initial and final risings, determines the type curve that evidence the mobilization of both, authigenic and detrital clays. The treatment of the measured data in test#2 shows that 82% of the initial attached particles are authigenic. The model parameters in order of decrease of their sensitivity are contact-bond radius, pore radius, particle size, lever-arm ratio, tensile strength and aspect ratio. A novel experimental procedure to determine fines-migration formation damage by authigenic and detrital clays was developed. A newly derived mathematical model allows determining the model coefficients from the laboratory tests and predict future detachment rate of authigenic and detrital particles.
APA, Harvard, Vancouver, ISO, and other styles
2

Leonova, L. V., A. I. Antoshkina, and Yu S. Simakova. "Specific minerals in bryozoan bioherms and polychaetian limestones (Kazanthip reserve, Crimea)." In All-Russia Lithological Meeting «Geology of reefs». Institute of Geology FRC Komi SC UB RAS, 2020. http://dx.doi.org/10.19110/98491-013-71-73.

Full text
Abstract:
The object of our research is the Kazantip Cape (Kerch Peninsula, Crimea). Its attraction is a ring-shaped rock massif composed of bryozoans previously considered to be a reef structure growing on the limbs of rising brachyanticline about 8 million years ago. Application of complex of investigating methods show that clay deposits underlying bryozoan structure are composed of expandable mixed-layered minerals, smectite, kaolinite, chlorite, illite with accessory minerals (zircon, monazite, ilmenite). These clays are the result of eruption of fossilized analogue of mud volcano. This process was accompanied by unloading of cold gas-fluid seepage. Specific mineralization (barite, celestine, strontianite, authigenic minerals of rare-earth elements and manganese) of bryozoan’s bioherms indicates that the seep process continued even after the waning of mud volcanism.
APA, Harvard, Vancouver, ISO, and other styles
3

Hashemi, Abolfazl, Sara Borazjani, Cuong Nguyen, Grace Loi, Alexander Badalyan, Bryant Dang-Le, and Pavel Bedrikovetsky. "Fines Migration and Production in CSG Reservoirs: Laboratory & Modelling Study." In SPE Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210764-ms.

Full text
Abstract:
Abstract Fines detachment is an important component of methane production from Coal Bed Methane reservoirs. Production of coal fines is widely observed during dewatering and simultaneous gas-water production. The theory for fines detachment by drag against electrostatic attraction, model of the transport of those detrital fines, and their validation by laboratory test is widely used for planning and design of Coal Seam Gas developments. However, clay particles that naturally grow on coal grains and asperous parts of coal surfaces (authigenic and potential coal fines) are detached by breakage. To the best of our knowledge, the analytical theory for detachment of authigenic and potential coal fines is not available. The present paper fills the gap. Based on Timoshenko's beam theory, we derive failure conditions for breakage of authigenic and potential coal fines of the rock surface. It allows defining maximum retention function for fines breakage. The maximum retention is incorporated into transport equation of mobilized fines, allowing developing analytical models for linear flow of core flooding and radial flow of well inflow performance. Matching of laboratory coreflood data from four laboratory studies show high agreement. The model coefficients obtained by treatment of laboratory data allow predicting skin growth in production wells under fines migration.
APA, Harvard, Vancouver, ISO, and other styles
4

Han, Shujun, Stefan Löhr, April Abbott, Andre Baldermann, and Bingsong Yu. "Authigenic clay mineral evidence for restricted, evaporitic conditions during the emergence of the Ediacaran Doushantuo Biota." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.3534.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Korotchenkova, O. V. "AUTHIGENIC MINERAL FORMATION AT THE TOP OF THE CLAY-ANHYDRITE STRATA OF THE VERKHNEKAMSKOE SALT DEPOSIT (IZVERSKY AREA)." In Проблемы минералогии, петрографии и металлогении. Научные чтения памяти П. Н. Чирвинского. ПЕРМСКИЙ ГОСУДАРСТВЕННЫЙ НАЦИОНАЛЬНЫЙ ИССЛЕДОВАТЕЛЬСКИЙ УНИВЕРСИТЕТ, 2022. http://dx.doi.org/10.17072/chirvinsky.2022.148.

Full text
Abstract:
The mineral composition and textural features of rocks formed at the boundary between the underlying rock salt and the clay-anhydrite strata of the Verkhnekamskoe Salt Deposit have been investigated. The transformations of sulfate-carbonate rocks revealed here are associated with recrystallization processes that occurred during plastic deformations. All this led to the formation of celestine with an admixture of barium, anhydrite, quartz and pyrite. Crystallization of newly formed minerals oc-curred due to hydrolysis of aluminosilicate material and sulfate reduction
APA, Harvard, Vancouver, ISO, and other styles
6

Kukla, Tyler, Jeremy K. Caves Rugenstein, Daniel E. Ibarra, Matthew J. Winnick, Caroline A. E. Strömberg, and C. Page Chamberlain. "WESTERN NORTH AMERICAN GRASSLAND EXPANSION AND SEASONAL DRYING IN THE CENOZOIC: EVIDENCE FROM AUTHIGENIC CLAY AND CARBONATE OXYGEN ISOTOPES." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-356268.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Läuchli, Charlotte, Patrick Frings, Nestor Gaviria-Lugo, Anne Bernhardt, Dirk Sachse, and Hella Wittmann. "Investigating the role of marine authigenic clay formation in setting the δ7Li composition of seawater." In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.13155.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Torres, Marta, Kitty Milliken, Andre Huepers, JiHoon Kim, Seung-Gu Lee Lee, and Junli Zhang. "AUTHIGENIC CLAY VERSUS CARBONATE AS PRODUCTS OF MARINE SILICATE WEATHERING (MSIW) IN THE INPUT SEQUENCE TO THE SUMATRA SUBDUCTION ZONE." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-349206.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Zhang, Mengchuan, Tianbo Liang, Hao Bai, Bojun Li, Qing Wang, Erdong Yao, Fujian Zhou, and Wei Liu. "Production Enhancement with a New Acid in Tight Sandstone Reservoirs: Accelerating Guar Breaking and Minimizing Formation Damage." In 56th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2022. http://dx.doi.org/10.56952/arma-2022-2322.

Full text
Abstract:
ABSTRACT: Crosslinked guar is suitable for the stimulation of thick tight sandstone reservoir, which can enhance the height and length of propped fractures. However, conventional gel breakers can leave residues that causes formation damage. Acid can accelerate the gel breaking rate, but it may cause secondary precipitation damage after reacting with the reservoir rock. In this study, a new acid with a low reaction rate, chelating effect, and high gel breakage is developed that can enhance the conductivity of created fractures by minimizing gel residues and inhibiting secondary precipitations after acidification. The breaking rate of the crosslinked guar by a conventional gel breaker and the new acid is compared, during which the viscosity of the solution, the molecular weight, residues, and the change of pressure with time before and after displacement damage are measured with time. The results show that the gel breaking speed of adding new acid is twice that of adding conventional gel breaker. The average relative molecular weight of the polymer in the gel breaker is reduced by 20%, and the median particle size is less than 50 μm. The permeability recovery rate of adding the new acid is much higher than that of adding conventional gel breaker. The content of metal ions in the flowback liquid is much higher than that of the initial control sample, indicating that the acid system contains chelator has a better ability to inhibit secondary precipitation. Field test shows that the average daily oil production of a single well reaches 30 tons/day after the new acid is used. 1. INTRODUCTION Tight sandstone reservoirs are widely distributed, such as San Juan basin in the United States, Alberta basin in Canada, Ordos and Tarim Basin in China. Tight sandstone is defined as permeability less than 0.1 × 10−3 μm1 2 (Law et al., 1986). It is mainly caused by the massive precipitation of authigenic clay minerals, the crystallization of cement, and the change of primary pores. Compared with conventional reservoirs, tight sandstone has the characteristics of extremely low porosity and permeability, sensitive permeability to stress and high bound water saturation, and has fracture structures such as microfractures, cleavage fractures, and bedding fractures (Shanley et al., 2004).
APA, Harvard, Vancouver, ISO, and other styles
10

Simpson, Alexandra M., Daniel M. Deocampo, Nathan M. Rabideaux, Javier Cuadros, Jeremy S. Delaney, and Gail M. Ashley. "A COMPARATIVE ANALYSIS OF AUTHIGENIC CLAYS AND BULK GEOCHEMISTRY: OLDUVAI GORGE, TANZANIA." In 65th Annual Southeastern GSA Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016se-273661.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Authigenic clay"

1

Brookins, D., D. Ward, and S. Lambert. Authigenic clay minerals in the Rustler Formation, WIPP (Waste Isolation Pilot Plant) Site area, New Mexico. Office of Scientific and Technical Information (OSTI), May 1990. http://dx.doi.org/10.2172/7081991.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Authigenic clay' for particular source types:
Journal articles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography