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Journal articles on the topic 'Gypsum concretion'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Laureys, Aurélie, Peter Richardson, Katrijn Verhasselt, et al. "Evaluation of Corrosion Impeding Concretion Layers Formed on Shipwreck Steel in the Belgian North Sea." Corrosion 80, no. 5 (2024): 539–55. http://dx.doi.org/10.5006/4341.

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Steel shipwrecks buried along the Belgian and French North Sea coast have proven to show very low corrosion rates due to concretion. This work aims to provide an in-depth analysis of the formed concretion layers and gain a more complete understanding of the gradual deposition processes in the North Sea. Detailed microstructural characterization by scanning electron microscopy, energy dispersive x-ray spectroscopy, and x-ray diffraction of two different specimens demonstrates that the concretion includes a complex structure of multiple layers. Closest to the metal surface, a layer of 100% akaga

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2

Khaleefah, U. Q., M. A. Hussein, and S. K. Chasib. "Mineralogy and sediment grain-size distributions as index of the modern sedimentary processes of Sawa Lake, Mothanna Governorate, Southwestern Iraq." Mesopotamian Journal of Marine Sciences 34, no. 2 (2021): 98–111. http://dx.doi.org/10.58629/mjms.v34i2.31.

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Sawa Lake is located in the southwest of Samawa city, it is of geological significance because it lies in the transitional zone between the sedimentary plain and the western plain, which is semi-desert and relies on the ground water as providing sources. It has a special case in sedimentation. The mineralogical composition of the lake sediments is characterized by Gypsum Calcite, Anhydrite, and Hematite, which is in turn builds different forms of sedimentary structures, including the tuberous, concretion, Nodule, and linear forms, as well as the deposition of calcium carbonate at the bottom of

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3

Costantini, Ilaria, Julene Aramendia, Nagore Prieto-Taboada, Gorka Arana, Juan Manuel Madariaga, and Juan Francisco Ruiz. "Study of Micro-Samples from the Open-Air Rock Art Site of Cueva de la Vieja (Alpera, Albacete, Spain) for Assessing the Performance of a Desalination Treatment." Molecules 28, no. 15 (2023): 5854. http://dx.doi.org/10.3390/molecules28155854.

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In this work, some micro-samples belonging to the open-air rock art site of Cueva de la Vieja (Alpera, Albacete, Spain) were analysed. These samples were collected after and before a desalination treatment was carried out, with the aim of removing a whitish layer of concretion that affected the painted panel. The diagnostic study was performed to study the conservation state of the panel, and to then confirm the effectiveness of the treatment. Micro energy dispersive X-ray fluorescence spectrometry, Raman spectroscopy, and X-ray diffraction were employed for the characterization of the degrada

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4

Zhou, Yang, Pengfei Di, Niu Li, Fang Chen, Xin Su, and Jinpeng Zhang. "Unique Authigenic Mineral Assemblages and Planktonic Foraminifera Reveal Dynamic Cold Seepage in the Southern South China Sea." Minerals 10, no. 3 (2020): 275. http://dx.doi.org/10.3390/min10030275.

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Many cold seeps and gas hydrate areas have not been discovered beside the Beikan basin in the southern South China Sea (SCS), and their characteristics and histories also remain poorly known. Here we describe authigenic minerals and the carbon and oxygen isotopic composition of planktonic foraminifera Globigerinoides ruber from sediment core 2PC, recovered from the gas hydrate zone of the Nansha Trough, southern SCS, to elucidate its history of dynamic cold seepage. We infer that the occurrence of authigenic gypsum crystals and pyrite concretions, and anomalously negative δ13C values of Globig

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5

Cruz, Gilberto, Henrique Almeida, and Marcondes Costa. "SEDIMENTOLOGIA, ESTRATIGRAFIA E MINERALOGIA DA FORMAÇÃO SOLIMÕES NO IGARAPÉ DIABINHO AFLUENTE DO RIO ENVIRA FEIJÓ-ACRE." Boletim do Museu de Geociências da Amazônia 11, no. 3 (2024): 1–36. http://dx.doi.org/10.31419/issn.2594-942x.v112024i3a5gsc.

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The Igarapé Diabinho, is a tributary on the right bank of the Envira river, which is part of the Juruá river basin in the central region of the State of Acre (municipality of Feijó). It is in a U-type valley, carving out the sediments known as the Solimões Formation, considered as of Late Miocene to Pliocene age. In this stream, as well as in many regions of Acre, these sediments are partly covered by alluvial (fluvial-lacustrine) sediments from the Quaternary. The rocky exposures along the Diabinho stream show a succession of massive silt-clay sediments, green to cream in color, with vertical

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6

He, Qing, Yanfei An, Fangji Sun, and Chunkit Lai. "Genesis of Pyrite Concretions: Constraints from Mineral and Geochemical Features of Longtan Formation in Anhui Province, Eastern China." Minerals 9, no. 8 (2019): 467. http://dx.doi.org/10.3390/min9080467.

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The occurrence of pyrite concretions in the Permian Longtan Formation sheds light on the paragenesis, formation conditions and regional paleoenvironment. We analyzed the mineral and geochemical characteristics of pyrite concretions using scanning electron microscopy-energy dispersive spectrometer (SEM-EDS), X-ray diffraction (XRD) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) from the Longtan Formation shales in Anhui, Eastern China. These pyrite concretions consist of two types, each with a distinct nucleus and outer layer: The former is mainly made up of quartz,

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7

Silva Júnior, Otávio Joaquim da, Tiago Ancelmo de Carvalho Pires de Oliveira, and José Jeferson do Rego Silva. "Influência dos compósitos na isolação sonora de vedações em bloco de gesso." Ambiente Construído 23, no. 4 (2023): 155–68. http://dx.doi.org/10.1590/s1678-86212023000400696.

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Resumo As propriedades internas dos materiais, como densidade, rigidez e amortecimento, influenciam diretamente na capacidade de isolação sonora de vedações verticais ao ruído aéreo, e aumentar a isolação sonora requer conhecimento dessas propriedades. Entre os materiais utilizados na construção civil brasileira destaca-se o bloco de gesso, pois possui dimensões que aumentam sua produtividade e menor densidade que os blocos cerâmico e de concreto. Contudo, sua capacidade de isolação sonora não é diferente dos sistemas construtivos convencionais. Diante da necessidade de aumentar a capacidade d

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8

Hoppe Filho, J., B. Rheinheimer, S. S. Khoe, L. V. Artigas, A. F. Sabbag, and M. H. F. Medeiros. "Degradação do concreto de uma Estação de Tratamento de Esgoto (ETE) por ácido sulfúrico biogênico." Revista ALCONPAT 4, no. 2 (2014): 84–96. http://dx.doi.org/10.21041/ra.v4i2.63.

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RESUMOEm ETEs, o ataque ácido (associado ao ataque por sulfatos como consequência secundária) afeta a pasta de cimento formando etringita e/ou gipsita, provocando expansão, fissuração e friabilidade do material. Este mecanismo de degradação do concreto atinge, também, o C-S-H, reduzindo a capacidade portante e a vida útil da estrutura. O objetivo deste trabalho é apresentar resultados de uma inspeção de uma ETE em funcionamento há aproximadamente 15 anos, onde há visível degradação do concreto por ataque combinado de ácido e sulfato. A análise contempla resultados de amostra coletada em região

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9

Cañaveras, Juan Carlos, María Concepción Muñoz-Cervera, and Sergio Sánchez-Moral. "Deterioration Processes on Prehistoric Rock Art Induced by Mining Activity (Arenaza Cave, N Spain)." Geosciences 12, no. 8 (2022): 309. http://dx.doi.org/10.3390/geosciences12080309.

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Arenaza Cave is located in Vizcaya (N Spain) and contains important Palaeolithic rock art representations. This cave belongs to an active karstic system developed on Lower Cretaceous limestones, mainly consisting of micrites and biomicrites with abundant pyrite moulds. The paintings are made directly on the host rock or on thin stalagmitic calcite crusts. Cretaceous limestones in this area contain important iron ore deposits, which have been mined by subsurface and surface-mining methods since the beginning of the 20th century. Mining activities have induced significant changes in the karstic

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10

Makarenko, Valerii, Volodymyr Hots, Alla Maistrenko, Volodymyr Azutov, and Olena Chyhyrynets. "Features of reinforced concrete corrosion processes in aggressive environments and methods of corrosion protection of building structures." Strength of Materials and Theory of Structures, no. 114 (April 25, 2025): 255–64. https://doi.org/10.32347/2410-2547.2025.114.255-264.

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The article deals with the production of concrete with high corrosion resistance in the most common environments and in sulfate, chloride, acid, etc. It is shown that the corrosion resistance of concrete is determined by two main indicators - a slight permeability to an aggressive environment and positive reactivity with the components of an aggressive environment. Quantitative values of these indicators are given. The use of concrete with high corrosion resistance makes it possible to create concrete and reinforced concrete structures with high durability in aggressive environments with out t

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11

García Sanz, Carolina. "Policía y gitanos españoles en la encrucijada democrática: una aproximación desde la documentación del Archivo General del Ministerio del Interior." Sociología Histórica, no. 10 (October 8, 2019): 153–73. http://dx.doi.org/10.6018/sh.398521.

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La consolidación del concepto positivista de “peligrosidad social” sustanciaría lo que determinados juristas denominan como “fraude de las etiquetas” en el circuito penal español en el siglo XX. Este proceso afectó singularmente a la población gitana debido al éxito de la explicación étnica de algunos tipos de criminalidad. Este trabajo, a partir de la exploración de los fondos documentales sobre la “cuestión gitana” custodiados en el Archivo General del Ministerio del Interior, tiene un doble objetivo: (1) el primero y más general, contribuir a generar conocimiento sobre la problematiza

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12

Camiña, Álvaro, José Antonio Pinzolas, María Inmaculada Ibañez, Nana Vicente, and Hernando García-Albi. "Impacto en los quirópteros de dos parques eólicos en el Valle del Ebro (Zaragoza) y propuesta de mitigación." Barbastella 15, no. 1 (2022): 22–35. http://dx.doi.org/10.14709/barbj.15.1.2022.03.

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Este trabajo analiza la siniestralidad de murciélagos (27,09 ae/año) y aves (10,09 ae/ año) en dos parques eólicos de cinco y seis aerogeneradores en Aragón a lo largo de un ciclo anual en el Valle del Ebro. Comparamos los resultados de este estudio con los del promotor, profundizando en los errores de detectabilidad y tasa de permanencia asociados que afectan a la estima de mortalidad. Se identificaron cinco especies Pipistrellus pipistrellus, Pipistrellus pygmaeus y Pipistrellus kuhlii, Eptesicus serotinus e Hypsugo savii que colisionaron principalmente entre junio y octubre. La mortalidad a

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13

Camiña, Álvaro, José Antonio Pinzolas, María Inmaculada Ibañez, Nana Vicente, and Hernando García-Albi. "Impacto en los quirópteros de dos parques eólicos en el Valle del Ebro (Zaragoza) y propuesta de mitigación." Barbastella 15, no. 1 (2022): 22–35. https://doi.org/10.5281/zenodo.14820644.

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(Uploaded by Plazi for the Bat Literature Project) Este trabajo analiza la siniestralidad de murciélagos (27,09 ae/año) y aves (10,09 ae/ año) en dos parques eólicos de cinco y seis aerogeneradores en Aragón a lo largo de un ciclo anual en el Valle del Ebro. Comparamos los resultados de este estudio con los del promotor, profundizando en los errores de detectabilidad y tasa de permanencia asociados que afectan a la estima de mortalidad. Se identificaron cinco especies Pipistrellus pipistrellus, Pipistrellus pygmaeus y Pipistrellus kuhlii, Eptesicus serotinus e Hypsugo savii que colisionaron pr

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14

Mari, Carmen Pérez Giráldez. "El significado de "cante jondo" antes de 1992 The meaning of "Cante jondo" before 1922." Música Oral del Sur, no. 12 (November 5, 2015): 103–22. https://doi.org/10.5281/zenodo.4636628.

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Resumen: “Cante jondo” es un término que, dentro de la literatura del flamenco, está muy asociado al Concurso de cante jondo celebrado en Granada en 1922. Pero ¿y antes de 1922 qué importancia tenía el “cante jondo”? A lo largo de este trabajo vamos a estudiar el significado del término “cante jondo” en un periodo de tiempo concreto (18811922). De este modo podremos tomar conciencia de lo que representaba esta música antes de la puesta en marcha del Concurso. El estudio que vamos a tomar como base y como

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15

Maria, Pia Cruz. "CHARACTERIZATION OF GYPSUM CONCRETION IN LOESS: SOME GEOTECHNICAL CONSIDERATIONS." November 15, 2015. https://doi.org/10.3233/978-1-61499-603-3-3248.

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<strong>.</strong> In this research, small gypsum concretions are described in primary and secondary loess located in Córdoba city (Argentina). The process by which gypsum confers some cementation in small concretion depends on the origin of the sediments (primary loess or secondary loess). Gypsum infiltrates from rainwater seepage (leaching and recrystallization) from surface layers which contain abundant sulfate crystallized amorphous calcium in concretions of primary loess, though, in concretion of secondary loess could be by crystallization in lagoon  environment or crystalliza

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16

Meng, Fan, Zhong Han, Xiumian Hu, et al. "Siderite from the Tibetan Himalaya: Evidence for a low sulphate ocean during Oceanic Anoxic Event 1a (Early Aptian)." Sedimentology, July 5, 2024. http://dx.doi.org/10.1111/sed.13218.

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AbstractMesozoic oceanic anoxic events were characterized by relatively low seawater sulphate concentrations ([]), which likely regulated the development and evolution of these major palaeoceanographic phenomena. However, there is little reliable sedimentary evidence for low [] in ancient marine waters and understanding of how such a seawater chemistry potentially impacted oceanic anoxic events is limited. This study presents an integrated sedimentological, mineralogical and geochemical investigation of the mineral siderite hosted in dark grey shale and sideritic concretions of Early Aptian (c

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17

Woodborne, Stephan, Duncan Miller, Mary Evans, Hayley C. Cawthra, and Stephan Winkler. "Radiocarbon-dated evidence for Late Pleistocene and Holocene coastal change at Yzerfontein, Western Cape, South Africa." South African Journal of Science 119, no. 11/12 (2023). http://dx.doi.org/10.17159/sajs.2023/15505.

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We report radiocarbon dates obtained from on-shore marine and near-shore terrestrial deposits near Yzerfontein, on the West Coast of South Africa. These deposits include Late Pleistocene shell concretions from the southern end of 16 Mile Beach and a marine shell deposit inland of the coastal Rooipan (Red Pan); mid-Holocene coastal pan deposits exposed by modern storm erosion of the sandy 16 Mile Beach; and four Holocene storm beach deposits on a rocky shore to the south. We interpret the results in terms of local geomorphology constraints on sea-level fluctuations. The eastern margin of Rooipa

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18

Rysak, Bethany, Julia F. W. Gale, Stephen E. Laubach, and David A. Ferrill. "Mechanisms for the Generation of Complex Fracture Networks: Observations From Slant Core, Analog Models, and Outcrop." Frontiers in Earth Science 10 (March 29, 2022). http://dx.doi.org/10.3389/feart.2022.848012.

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We use observations of hydraulic fractures in core, outcrop attributes of natural hydraulic fractures, and analogue models, to address how hydraulic fracture networks evolve. A slant core from the Wolfcamp Formation—an unconventional shale hydrocarbon reservoir in the Permian Basin of West Texas—collected within 18 m and 30 m of two hydraulically stimulated horizontal wells, provided an opportunity to examine hydraulic fractures directly. In approximately 183 m of core, 309 calcite-sealed natural opening-mode fractures and 375 hydraulic fractures were identified. Many hydraulic fractures in th

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19

Moser, Michael, and Olga Piros. "Lithostratigraphic definition of the Anisian carbonate-ramp deposit of the Annaberg Formation (Middle Triassic, Northern Calcareous Alps, Austria)." Geologica Carpathica 72, no. 3 (2021). http://dx.doi.org/10.31577/geolcarp.72.3.1.

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Concerning the Middle Triassic stratigraphic succession of the Northern Calcareous Alps (NCA), a modern, litho- and biostratigraphic oriented evaluation of the early- and middle Anisian Annaberg Formation is presented. Due to the fact, that Middle Triassic formations are characterized by a wide distribution within the NCA, any lithostratigraphic definitions of these formations would be of great benefit for mapping geologists, engineers and hydrogeologists. The lithostratigraphic term Annaberg Formation may substitute former designations like “Alpiner Muschelkalk”, “Anisian Limestone and Dolomi

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