Journal articles: 'Petrography'

1

Babine, Karen. "Petrography." River Teeth: A Journal of Nonfiction Narrative 8, no. 1 (2006): 5–16. http://dx.doi.org/10.1353/rvt.2006.0000.

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Pearson, Geoffrey L., John E. Prentice, and Alastair W. Pearson. "Three English Romanesque Lecterns." Antiquaries Journal 82 (September 2002): 328–39. http://dx.doi.org/10.1017/s0003581500073856.

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Three surviving stone lecterns are described and analysed in terms of their petrography and sculptural style. The similarity between their petrography strongly suggests that they share a common origin, traceable to a quarry or quarries in the immediate vicinity of Much Wenlock, and that the similarity of sculptural style and dimensions points to them being a product of a single workshop. Furthermore, the authors suggest that the petrographie and stylistic characteristics show striking similarities to the Much Wenlock lavabo, thus adding support to the notion of a Much Wenlock workshop.

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Middleton, Andrew. "Ceramic petrography." Revista do Museu de Arqueologia e Etnologia. Suplemento, supl.2 (December 10, 1997): 73. http://dx.doi.org/10.11606/issn.2594-5939.revmaesupl.1997.113441.

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Morad, Sadoon. "Sedimentary petrography." Sedimentary Geology 92, no. 3-4 (September 1994): 292–94. http://dx.doi.org/10.1016/0037-0738(94)90114-7.

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Di Febo, Roberta, Lluís Casas, Jordi Rius, Riccardo Tagliapietra, and Joan Melgarejo. "Breaking Preconceptions: Thin Section Petrography For Ceramic Glaze Microstructures." Minerals 9, no. 2 (February 15, 2019): 113. http://dx.doi.org/10.3390/min9020113.

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During the last thirty years, microstructural and technological studies on ceramic glazes have been essentially carried out through the use of Scanning Electron Microscopy (SEM) combined with energy dispersive X-ray analysis (EDX). On the contrary, optical microscopy (OM) has been considered of limited use in solving the very complex and fine-scale microstructures associated with ceramic glazes. As the crystallites formed inside glazes are sub- and micrometric, a common misconception is that it is not possible to study them by OM. This is probably one of the reasons why there are no available articles and textbooks and even no visual resources for describing and characterizing the micro-crystallites formed in glaze matrices. A thin section petrography (TSP) for ceramic glaze microstructures does not exist yet, neither as a field of study nor conceptually. In the present contribution, we intend to show new developments in the field of ceramic glaze petrography, highlighting the potential of OM in the microstructural studies of ceramic glazes using petrographic thin sections. The outcomes not only stress the pivotal role of thin section petrography for the study of glaze microstructures but also show that this step should not be bypassed to achieve reliable readings of the glaze microstructures and sound interpretations of the technological procedures. We suggest the adoption by the scientific community of an alternative vision on glaze microstructures to turn thin section petrography for glaze microstructures into a new specialized petrographic discipline. Such an approach, if intensively developed, has the potential to reduce the time and costs of scientific investigations in this specific domain. In fact, it can provide key reference data for the identification of the crystallites in ceramic glazes, avoiding the repetition of exhaustive protocols of expensive integrated analyses.

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Geschwind, Carl-Henry. "The Beginnings of Microscopic Petrography in the United States, 1870-1885." Earth Sciences History 13, no. 1 (January 1, 1994): 35–46. http://dx.doi.org/10.17704/eshi.13.1.x3888321461141qu.

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In the 1860's and 70's, microscopic petrography flourished in Germany, where descriptions and classifications of rocks were highly valued for their own sake. American geologists, however, were more interested in stratigraphical correlations and had relatively little use for petrographical details. Thus, such Americans as George Hawes and Alexis Julien, who attempted to introduce the microscope for purely petrographical work in the early 1870's, had great difficulties in finding an audience. During the late 1870's, however, a number of American geologists-including federal geologists working amongst the volcanic rocks of the West, state geologists mapping in the Lake Superior region, and mining geologists examining the Comstock Lode and the Leadville district-came to appreciate the aid microscopic petrography could provide for stratigraphical correlations. This growing interest led to the hiring of a number of microscopic petrographers around 1880. These petrographers were trained in Germany, where they had imbibed the German passion for petrography for its own sake, but most of them adapted themselves to the American practice of using petrography for stratigraphy. Unlike many of their German counterparts, these American petrographers spent a substantial portion of their time in the field and combined mapping with microscopic examinations to solve stratigraphical problems. Thus, the different scientific cultures of Germany and the U.S. significantly affected the ways in which the petrographic microscope was used.

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Safari Farrokhad, Sajad, Gholam Reza Lashkaripour, Nasser Hafezi Moghaddas, Saeed Aligholi, and Mohanad Muayad Sabri Sabri. "The Effect of the Petrography, Mineralogy, and Physical Properties of Limestone on Mode I Fracture Toughness under Dry and Saturated Conditions." Applied Sciences 12, no. 18 (September 15, 2022): 9237. http://dx.doi.org/10.3390/app12189237.

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Determining the fracture toughness of rock materials is a challenging, costly, and time-consuming task, as fabricating a sharp crack in rock specimens will lead to failure of the specimen, and preparing specimens for determining the rock fracture toughness requires special equipment. In this paper, the relationship between mode I fracture toughness (KIC) with the rock index properties, mineralogy, and petrography of limestone is investigated using simple nonlinear and simple/multiple linear regression analyses to provide alternative methods for estimating the fracture toughness of limestones. The cracked chevron notched Brazilian disk (CCNBD) method was applied to 30 limestones with different petrographic and mineralogical characteristics under both dry and saturated conditions. Moreover, the index properties of the same rocks, including the density, porosity, electrical resistivity, P and S wave velocities, Schmidt rebound hardness, and point load index, were determined. According to the statistical analyses, a classification based on the petrography of the studied rocks was required for predicting the fracture toughness from index properties. By classifying the limestones based on petrography, reliable relationships with high correlations can be introduced for estimating the fracture toughness of different limestones using simple tests.

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Van den Kerkhof, Alfons M., and Ulrich F. Hein. "Fluid inclusion petrography." Lithos 55, no. 1-4 (January 2001): 27–47. http://dx.doi.org/10.1016/s0024-4937(00)00037-2.

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Sajid, Muhammad, Muhammad Yaseen, Muhammad Zeeshan Ullah, and Ghulam Murtaza. "Textural Implications in Assessment of Physico-Mechanical behaviour of Metavolcanic Rocks from Dir Upper, north western Pakistan." International Journal of Economic and Environmental Geology 11, no. 3 (December 4, 2020): 1–10. http://dx.doi.org/10.46660/ijeeg.vol11.iss3.2020.469.

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The Dir-Utror meta-volcanics from the south western portion of the Kohistan arc in northern Pakistan areanalyzed in term of their petrography, physico-mechanical properties. Field observations and petrography show thecollected representative samples to be fine-grained meta-andesites (FMA), coarse-grained meta-andesites (CMA) andagglomerate (AG). The relationship between petrography and physico-mechanical properties has been investigatedwhich inferred the grain size to be the major factor, alongside grains’ shape, arrangement and size distribution as wellas degree of mineral alteration significantly affecting the mechanical behavior of rocks. The CMA yield more strength(98 MPa) than FMA (93 MPa) due to its lesser degree of mineral alteration, inequigranular texture, lack of preferredmineral alignment, relatively low porosity and water absorption. The lower strength of agglomerate (57 MPa)corresponds to abundance of soft minerals (calcite), exotic rock fragments and coarse-grained texture. Based onphysico-mechanical properties including specific gravity, bulk density, aggregate impact value, Los Angeles abrasionvalue and unconfined compressive strength (UCS), these rocks fall within permissible range to be utilized for multipleengineering purposes including dimension stones and foundation materials for other civil structures. However,petrographic investigations reveal excessive amount of reactive silica in these rocks making them prone to alkali-silicareactivity in concrete works with ordinary Portland cement (OPC). Hence these rocks are not recommended for use assole aggregate material or low-alkali cement is recommended, if used.

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10

French, W. J. "Concrete petrography: a review." Quarterly Journal of Engineering Geology and Hydrogeology 24, no. 1 (February 1991): 17–48. http://dx.doi.org/10.1144/gsl.qjeg.1991.024.01.03.

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Cárdenes, Victor, Álvaro Rubio-Ordóñez, Jörn Wichert, Jean Pierre Cnudde, and Veerle Cnudde. "Petrography of roofing slates." Earth-Science Reviews 138 (November 2014): 435–53. http://dx.doi.org/10.1016/j.earscirev.2014.07.003.

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McK. Clough, T. H., and A. R. Woolley. "Petrography and stone implements." World Archaeology 17, no. 1 (June 1985): 90–100. http://dx.doi.org/10.1080/00438243.1985.9979952.

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Larson, Erik B., and Ronald V. Emmons. "Dissolution of Carbonate Rocks in a Laboratory Setting: Rates and Textures." Minerals 11, no. 6 (June 5, 2021): 605. http://dx.doi.org/10.3390/min11060605.

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Determining the dissolution rates of carbonate rocks is vital to advancing our understanding of cave, karst, and landscape processes. Furthermore, the role of carbonate dissolution is important for the global carbon budget and climate change. A laboratory experiment was setup to calculate the dissolution rates of two whole rock carbonate samples with different petrographic makeup (ooids and brachiopods). The carbonate rock samples were also explored under a scanning electron microscope to evaluate the textures that developed after dissolution The oolitic limestone dissolved at a rate of 1579 cm yr−1, and the pentamerous limestone (dolostone) dissolved at a rate of 799 cm yr−1. Both rocks did not dissolve evenly across their surface as indicated by scanning electron microscopy, it appears the allochems dissolved preferentially to the matrix/cement of the rocks and that some mechanical weathering happened as well. This work reports that the petrography and mineralogy of carbonate rocks is important to consider when exploring the cave, karst, and landscape evolution and that attention should be paid to the petrography of carbonate rocks when considering the global carbon budget.

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Aminu, Mu’awiya B., Simon D. Christopher, Changde A. Nanfa, Ahmad T. Dahiru, Andarawus Yohanna, Nengak Musa, and Simon Tobias. "Petrography and Heavy Mineral Studies of Lokoja Formation along Mount Patti North Central Nigeria: Implication for provenance Studies." European Journal of Environment and Earth Sciences 3, no. 2 (March 31, 2022): 36–51. http://dx.doi.org/10.24018/ejgeo.2022.3.2.243.

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The Southern Bida basin consists of the Lokoja, Patti, and Agbaja formations. This study focuses on the Lokoja formation and samples gotten were used for petrography and heavy mineral analysis. Results of all analytical techniques employed in the study are presented here. A critical assessment of each set of results and their integration aided the proper interpretation and useful discussion. This study focuses on the Southern Bida Basin, specifically the Lokoja Formation because the exposures of Patti are poorly exposed. Outcrop samples were obtained from the exposed sections of the study area in Kabawa and Robinson street respectively. Different features were observed, such as the thickness of the exposure, the nature of the lithology, color, and sedimentary structures. The dominant lithologies in the area include sandstone and ironstone. The sandy facies are generally arkosic characterized by poorly sorted very fine to conglomeratic sandstone sequence. Laboratory investigations of samples included petrography and heavy mineral analysis. Sandstone samples were collected from the study area. Each sample was divided into two parts: the first part for petrographic studies and the second part for heavy mineral analysis.

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PËRGJEGJAJ, Silvana, and Sokol MARKU. "Geotechnical and petrographic properties of carbonate sedimentary rocks from Sasaj region (Ionian Zone) and their use as aggregates for road pavement." Ingenious 3, no. 2 (2023): 85–96. http://dx.doi.org/10.58944/dgra8877.

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This paper is a part of the master’s thesis with the title “Geotechnical and petrographic properties of carbonate sedimentary rocks from different zones of Albania regarding their use as aggregates for road pavement” where this topic presents a particular method of study of limestones and dolomite aggregates from the point of view of their petrographic characteristics, the petrography being an important working tool which proves to be indispensable alongside the classical geotechnical study currently used in Albania. Our work was born from the need to demonstrate that the studies carried out by engineering, geotechnics and geomechanics should not lack synthetic reports on the different types of aggregates used in Albania, especially those of carbonate origin. Moreover, our goal was to take a step forward to fill this gap by accurately correlating the general geological knowledge and the lithological and petrographic characteristics of carbonate rocks with the engineering properties of the aggregates produced from these types of rocks. It is well known that petrography is focusing on details invisible to the naked eye, and therefore, for rock materials selected for the production of aggregates, this microscopic analysis is also necessary, as well as other laboratory analyses, if necessary to verify the stability of these aggregates. Concretely, in this paper we will present a part of our results which show the methods which we used in the analysis of materials from samples of carbonate rocks coming from Sasaj region, one of the four carbonate rock formations that we studied in our master thesis, these formations belonging to four different geological tectonic zones of Albania: Mirdita, Albanian Alpes, Kruja and the Ionian zones. The complete material will be the subject of a more detailed paper for a high impact international journal.

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Растегаева, М. Н. "CERAMIC PETROGRAPHY: THE HISTORY OF THE METHOD AND THE CURRENT STATE." Proceedings in Archaeology and History of Ancient and Medieval Black Sea Region, S1 (December 9, 2022): 110–25. http://dx.doi.org/10.53737/2713-2021.2022.36.62.004.

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Методы петрографии давно и успешно применяются в геологии для описания и классификации горных пород. Во второй половине XIX в. они были заимствованы исследователями для изучения глиняных изделий, с целью определения компонентного состава сырья и минералов, использованных в качестве отощителя, а также для установления степени их изменений в процессе декарбонизации. Кроме того, петрография позволяет изучать органические остатки в составе формовочной массы с целью определения температуры обжига изделия. Со временем данное направление переросло в отдельную дисциплину, получившую название керамической петрографии и ставшей, по сути, археологическим методом изучения артефактов из глины, сочетающим традиционные археологические (визуальный, морфологический, типологический и т.д.) и естественнонаучные приемы характеристики керамики. В статье рассматривается отечественная и зарубежная историография, посвященная петрографическому анализу, преимущественно, обожженных сосудов. Главный акцент делается на исследованиях, затрагивающих основные вехи развития самого метода, а также характеризующих опыт его применения при изучении керамики античной эпохи. В статье также затрагиваются проблемы современного состояния керамической петрографии в отечественной науке. Petrography methods have long been successfully used in geology to describe and classify rocks. In the late half of the 19th century, they were borrowed by researchers to study clay products in order to establish the component composition of raw materials and minerals used as a non-plastic additives, as well as to determine the degree of their changes in the process of decarbonitization. In addition, petrography makes it possible to study organic residues in the composition of the molding mass in order to determine the firing temperature of the product. Over time, the approach has grown into a separate discipline called ceramic petrography and has become, in fact, an archaeological method of studying clay artifacts, combining traditional archaeological procedures (visual, morphological, typological analyses, etc.) and scientific methods. The article deals with Russian and foreign historiography devoted to the petrographic analysis, mainly of fired vessels. The main emphasis is placed on research that touches on the main milestones of the development of the method itself, as well as characterizing the experience of its application in the study of pottery making in classical antiquity. The article also touches upon the problems of the current state of ceramic petrography in Russian science.

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Taeubner, Alena A., and Vladimir P. Samodurov. "Quantitative petrography: approaches and applications." Journal of the Belarusian State University. Geography and Geology, no. 2 (December 28, 2021): 91–101. http://dx.doi.org/10.33581/2521-6740-2021-2-91-101.

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Quantitative petrography is a scientific and industrial direction of geology, which made huge progress due to developments and inventions in information technology and optics in the last decade. This article is introducing the modern and scientific directions of quantitative petrography and describes their current state of art as well as methodical approaches and their application. The research objects of quantitative macropetrography are hand specimens, borehole cores and polished tiles, and of micropetrography are thin and polished sections of rocks samples, splitted rock surfaces and immersion preparations. The goal of the research is to develop and present new methodological approaches of digital microscopy for the analysis of ores, rocks and minerals, as well as to investigate the morphological image analysis capabilities for the transforming from the classical description methods to quantitative petrography.

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Gilstrap, William D. "Ceramic petrography and hopewell interaction." Southeastern Archaeology 37, no. 1 (April 7, 2017): 82–83. http://dx.doi.org/10.1080/0734578x.2017.1313572.

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19

Kingery, W. David. "Optical Petrography—Reply to Barnett." Journal of Field Archaeology 18, no. 2 (January 1991): 255–56. http://dx.doi.org/10.1179/009346991792208317.

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Zuffa, G. G., U. Cibin, and A. Di Giulio. "Arenite Petrography in Sequence Stratigraphy." Journal of Geology 103, no. 4 (July 1995): 451–59. http://dx.doi.org/10.1086/629763.

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21

Beck, Margaret E. "Integrative Approaches in Ceramic Petrography." Plains Anthropologist 64, no. 250 (September 20, 2018): 211–12. http://dx.doi.org/10.1080/00320447.2018.1501541.

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22

Hower, James C. "International Handbook of Coal Petrography." International Journal of Coal Geology 51, no. 4 (September 2002): 263–64. http://dx.doi.org/10.1016/s0166-5162(02)00087-3.

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Butcher, A. R. "Ore microscopy and ore petrography." Minerals Engineering 9, no. 6 (June 1996): 699. http://dx.doi.org/10.1016/s0892-6875(96)90069-2.

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Ingham, J. P. "Petrography of geomaterials: a review." Quarterly Journal of Engineering Geology and Hydrogeology 44, no. 4 (November 2011): 457–67. http://dx.doi.org/10.1144/1470-9236/10-051.

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25

Mason, Robert B. "Petrography of Pottery from Kirman." Iran 41 (2003): 271. http://dx.doi.org/10.2307/4300648.

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Scharlotta, Ian. "Integrative Approaches in Ceramic Petrography." California Archaeology 10, no. 2 (July 3, 2018): 261–64. http://dx.doi.org/10.1080/1947461x.2018.1536375.

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Mustafa, Asaad, Howri Mansurbeg, and Ibrahim Mohialdeen. "Petrography and Clay Mineral Variations Across the Cretaceous/Paleogene (K/Pg) Boundary, Sulaimani, Kurdistan Region, Iraq." Iraqi Geological Journal 55, no. 2E (November 30, 2022): 16–34. http://dx.doi.org/10.46717/igj.55.2e.2ms-2022-11-16.

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The Cretaceous/Paleogene (K/Pg) boundary marks the global extinction of many life forms, this boundary around Sulaimani city coincides with the boundary between Tanjero and Kolosh formations. These two units are flysch deposits of the Zagros Foreland Basin. This study focuses on petrography and clay mineralogy variations between these two units. Petrographic study, X-Ray Diffraction analysis, and Scanning Electron Microscope analysis were conducted on samples from different lithologies. The petrographic study of fine-grain lithologies shows that they are mainly wackestone without variation across the boundary. Sandstone petrography shows variation in framework components by increasing quartz, feldspar, and igneous fragments while argillaceous, carbonates, chert, and chalcedony fragments are decreased from Tanjero to Kolosh formations. Obtained results from XRD and SEM show that the clay mineral assemblage is dominated by corrensite (regularly interstratified chlorite/smectite) with discrete chlorite, smectite and traces of illite. The existence of these clay assemblage suggests that corrensite is the diagenetic product of smectite as it is an intermediate stage of smectite chloritization. Enrichment of precursor smectite and high content of unstable grains in sandstones across the K/Pg boundary is the result of low-intensity weathering in arid and seasonal climates of the source area. The smaller size of detrital smectite than other clay minerals is behind its enrichment in the deep marine basin for both Tanjero and Kolosh formations. Sandstone enrichment with sedimentary fragments in both formations related to uplifted sedimentary terrain in its hinterland, while variation across the boundary indicates gradual uplift of Zagros ophiolite zone in the early Paleogene.

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Wang, Bao Hua, Shi Jie Li, and Bing Kui Miao. "The Mineral Chemistry and Classification of New Ordinary Chondrites Collected in Antarctica." Advanced Materials Research 621 (December 2012): 125–29. http://dx.doi.org/10.4028/www.scientific.net/amr.621.125.

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Petrography and mineral chemistry of ninety-eight ordinary chondrites from Grove Mountains, Antarctica, have been studied, in order to assign their chemical-petrographic types. The chemical-petrographic types of these meteorites are presented below: 36 H-groups (21 H4, 9 H5, 6 H6) and 62 L-groups (25 L5, 37 L6). The compositions of olivines and low-Ca pyroxenes in the all these ordinary chondrites have similar composition, respectively, reflecting some degree thermodynamics equilibration in them. The weathering degrees of all the ordinary chondrites, consisting of predominant weathering degrees of W1, suggest lightly weathered among them. More than 30% meteorites experienced severe shock metamorphism, as indicated by the presences of shock-induced melt veins and pockets. These heavily shocked meteorites provide us with natural samples for study of high-pressure polymorphs of minerals.

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Fazliakhmetov, Alexander. "NEW DATA ON PYROCLASTICS IN THE ILTIBANOVO FORMATION (THE LOWER DEVONIAN OF THE WEST MAGNITOGORSK ZONE OF THE SOUTHERN URALS)." Geologicheskii vestnik, no. 2 (July 14, 2022): 48–55. http://dx.doi.org/10.31084/2619-0087/2022-2-4.

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The subject of research is the petrography of sandstones and siltstones laminae 2–12 mm thick, occurring among the cherts in the lower part of the Iltibanovo Formation. 7 samples taken from the northern and southern ends of the dam of the Iltibanovsky reservoir in the Uchalinsky district of the Republic of Bashkortostan were studied. The petrographic study of the laminae showed that they contain euhedral crystals and angular fragments of pyroxenes and plagioclases; thin elongated plagioclase crystals; shapeless pyroclasts composed of chlorite or felsite mass, which were originally fragments of volcanic glass. These findings indicate synsedimentary (Lochkovian or Silurian) explosive volcanism.

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Emmanuel Franck Gouedji, Gnamba, Zie Ouattara, Clement Odon N CHO, Sangah Mita-Roland Cardioula, Marc-Antoine Audet, Bouake Bakayoko, Yacouba Coulibaly, Moro Olivier Boffoue, and Christian Picard. "PETROGRAPHY AND HYDROTHERMAL ALTERATION OF ULTRAMAFIC BED-ROCKS OF SOUTH SIPILOU: IMPLICATION IN THE LATERITIC NICKEL MINERALIZATION (DEPARTMENT OF SIPILOU, WESTERN IVORY COAST)." International Journal of Advanced Research 10, no. 10 (October 31, 2022): 1050–61. http://dx.doi.org/10.21474/ijar01/15580.

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South Sipilou is an area containing lateritic nickel mineralization that developed on ultramafic rocks in the department of Sipilou-Biankouma in western Ivory Coast. The objective of this study was to characterize the petrography and hydrothermal alterations affecting these ultramafic bed-rocks and to understand their involvement in lateritic nickel mineralization. Then to compare them to the ultramafic rocks already characterized in the department of Sipilou-Biankouma. Thus, the macroscopic characterization of these rocks was carried out in the field. Then, microscopic observations on the petrography and the hydrothermal alterations were made on these rocks after the preparation of thin sections in the laboratory.The results indicated that the lithologies of the ultramafic bed-rocks of South Sipilou consist of strongly serpentinized dunites, more or less harzburgitic lherzolites and olivine orthopyroxenites. Their petrographic characteristics showed a similarity with the ultramafic bed-rocks of the nickel-bearing lateritic mineralization of North Biankouma, North Sipilou and differences with those of Samapleu, Yepleu, in the department of Sipilou-Biankouma. Also, the main hydrothermal alterations of the ultramafic rocks of South Sipilou are composed of silicification, carbonation and serpentinization. Only serpentinizationcontributed to the concentration of nickel in the bed-rock and within the lateritic profile.

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Omanayin, Y. A., M. Lawal, I. B. Bolaji, and A. Muhammad. "Field and petrographic studies of Basement Complex rocks in Saigbe and Environs, North-Central, Nigeria." Nigerian Journal of Basic and Applied Sciences 31, no. 1 (October 24, 2023): 49–59. http://dx.doi.org/10.4314/njbas.v31i1.6.

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Geological mapping and petrographic studies of rocks provide useful information on texture and mineralogical composition of rocks which can be used in the exploration and exploitation of any associated mineralization. However, few regional studies have been conducted in Minna and environs. Here, preliminary field mapping and petrography of out crops in Saigbe environ were conducted to determine their identification, structural and mineralogical composition. Twenty-one rock samples were collected, eight of which were used for thin section analysis. Joint directions were measured and plotted on rose diagram. Results show that Saigbe is underlain by schist, amphibolite and granite with minor pegmatite intrusions. Joints, faults, fold and foliations constitute main structures. Joints in the schists trend NE-SW, while those in the granites trend NW-SE, suggesting different episodes of emplacement for both rocks. Petrography revealed that the schists comprised quartz, biotite, muscovite, plagioclase and opaque mineral, while the amphibolites are composed largely of quartz, hornblende, plagioclase feldspar and opaque minerals. The granites are composed of quartz, microcline, plagioclase feldspar, muscovite and opaque minerals. The pegmatite dykes in the granites comprised quartz, plagioclase feldspar, orthoclase feldspar, muscovite and gemstones, hence interpreted as product of residual melt. The pegmatites make interesting target for mineral exploration.

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Jin, Houxin, Le Cao, Xiu Kan, Weizhou Sun, Wei Yao, and Xialin Wang. "Coal petrography extraction approach based on multiscale mixed-attention-based residual U-net." Measurement Science and Technology 33, no. 7 (April 6, 2022): 075402. http://dx.doi.org/10.1088/1361-6501/ac5439.

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Abstract Coal petrography extraction is crucial for the accurate analysis of coal reaction characteristics in coal gasification, coal coking, and metal smelting. Nevertheless, automatic extraction remains a challenging task because of the grayscale overlap between exinite and background regions in coal photomicrographs. Inspired by the excellent performance of neural networks in the image segmentation field, this study proposes a reliable coal petrography extraction method that achieves precise segmentation of coal petrography from the background regions. This method uses a novel semantic segmentation model based on Unet, referred to as M2AR-Unet. To improve the efficiency of network learning, the proposed M2AR-Unet framework takes Unet as a baseline and further optimizes the network structure in four ways, namely, an improved residual block composed of four units, a mixed attention module containing multiple attention mechanisms, an edge feature enhancement strategy, and a multiscale feature extraction module composed of a feature pyramid and atrous spatial pyramid pooling module. Compared to current state-of-the-art segmentation network models, the proposed M2AR-Unet offers improved coal petrography extraction integrity and edge extraction.

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Rubo, Rafael Andrello, Cleyton de Carvalho Carneiro, Mateus Fontana Michelon, and Rafael dos Santos Gioria. "Digital petrography: Mineralogy and porosity identification using machine learning algorithms in petrographic thin section images." Journal of Petroleum Science and Engineering 183 (December 2019): 106382. http://dx.doi.org/10.1016/j.petrol.2019.106382.

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Bajnok, Katalin, Zoltán Kovács, and Anna Andrea Nagy. "Better late (Roman) than never! A possible amphora fragment from 6th century Balatonlelle, Western Hungary." Archeometriai Műhely 21, no. 2 (2024): 201–16. http://dx.doi.org/10.55023/issn.1786-271x.2024-016.

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This study reports on a unique finding connected to the re-examination of the ceramic assemblage recovered from the Langobard age (6th century AD) settlement of Balatonlelle, situated in the territory of the former Roman province of Pannonia (now in western Hungary). An undecorated body sherd, not picked up by either the initial typological evaluation of the ceramics or by the preliminary petrographic analysis, was now reassessed by thin section ceramic petrography and scanning electron microscopy. The new analyses revealed that this sherd contains rock and mineral inclusions originated from ophiolites, including slightly serpentinised peridotite fragments. Such rocks do not occur on the surface in Hungary, whereas they are commonly found in the Eastern Mediterranean. The presence of ophiolites in the potsherd indicates that this vessel was produced in a distant territory. The macroscopic characteristics of the sherd combined with its petrographic fingerprint suggest that this pot might have been a transport amphora produced in the Eastern Mediterranean. Although rarely found in Pannonia in the Migration Period, several amphora types, including the most frequently found LRA 1 type, were produced in numerous production centres in the Eastern Mediterranean, in territories geologically congruous with the aplastic inclusions found in the fabric of the Balatonlelle sherd. The significance of this finding is that from Langobard age Pannonia, amphorae occur only sporadically, connected mainly to former Roman settlements. While any conclusions drawn from a single sherd must necessarily remain tentative, this sherd nonetheless provides some material evidence for the existence of some sort of contact between Balatonlelle and the Eastern Mediterranean during the 6th century, be it economic, political or cultural. This study also aims to celebrate the career of György Szakmány, who was one of the key figures to establish ceramic petrographic research and education in Hungary, and trained many generations of petrographers – including the present authors. As such, it also serves as an example how ceramic petrography can bring a new dimension of information to archaeological research.

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Chen, Zhongliang, Feng Yuan, Xiaohui Li, Xiang Wang, He Li, Bangcai Wu, and Yuheng Chen. "Knowledge Extraction and Quality Inspection of Chinese Petrographic Description Texts with Complex Entities and Relations Using Machine Reading and Knowledge Graph: A Preliminary Research Study." Minerals 12, no. 9 (August 26, 2022): 1080. http://dx.doi.org/10.3390/min12091080.

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(1) Background: Geological surveying is undergoing a digital transformation process towards the adoption of intelligent methods in China. Cognitive intelligence methods, such as those based on knowledge graphs and machine reading, have made progress in many domains and also provide a technical basis for quality detection in unstructured lithographic description texts. (2) Methods: First, the named entities and the relations of the domain-specific knowledge graph of petrography were defined based on the petrographic theory. Second, research was carried out based on a manually annotated corpus of petrographic description. The extraction of N-ary and single-entity overlapping relations and the separation of complex entities are key steps in this process. Third, a petrographic knowledge graph was formulated based on prior knowledge. Finally, the consistency between knowledge triples extracted from the corpus and the petrographic knowledge graph was calculated. The 1:50,000 sheet of Fengxiangyi located in the Dabie orogenic belt was selected for the empirical research. (3) Results: Using machine reading and the knowledge graph, petrographic knowledge can be extracted and the knowledge consistency calculation can quickly detect description errors about textures, structures and mineral components in petrographic description. (4) Conclusions: The proposed framework can be used to realise the intelligent inspection of petrographic knowledge with complex entities and relations and to improve the quality of petrographic description texts effectively.

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Samodurov, Vladimir P., Alena A. Vasilionak, Yuriy N. Yalenski, and Anastasia M. Erohovets. "Digital ultraviolet petrography: approaches and applications." Journal of the Belarusian State University. Geography and Geology, no. 1 (May 29, 2020): 86–94. http://dx.doi.org/10.33581/2521-6740-2020-1-86-94.

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Integrated data on the approaches and applications of the rock fluorescent macro- and micropetrography is presented. Fluorescence in minerals is caused not by the major chemical elements but a wide range of chemical impurities (activators). As a result, fluorescence cannot be used for the mineral identification in the different deposits because of the different activators prevailing in the different localities. Nevertheless, fluorescence is the reliable typomorphic feature because the minerals with specific fluorescence forms in the same geochemical condition. This methodical approach is based on the combination of the epifluorescent microscopy and multifocal petrography of the rocks. Ultraviolet (UV) investigations by the reflectance microscopy method reveal some advantages, mostly in the sedimentary rocks studying – improving an optical resolution of the images, avoiding the microparticles overlapping inside the thin sections. On the contrary to the classical petrography which uses light source, fluorescent minerals are the source of light themselves, and this feature improves the optical resolution of this method as well. Ultraviolet investigations of the samples of Starobin UpperDevonian bed reveal polygenic processes of their forming. Silt-sized minerals with the different fluorescence features, small and high quantum yields, have been brought from the different sources. Prevailing marls, consisting of the clay minerals and dispersed calcite reveal invisible for the other methods structures – colloform aggregates, metasomatic replacement of the marls in the fracture zones of the rocks. Fluorescent features let to define hydrothermal and chemogenic minerals in the sedimentary rocks. For example, fluorescent borates in the salt formations of the evaporates. Nevertheless, complex methodical approach, such as XRD and XRF, needs for the accurate mineral definition.

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KARS, H., J. G. MOLTZER, and R. R. KNOOP. "Petrography of Archaic Antefixes from Satricum." BABESCH - Bulletin Antieke Beschaving 62 (January 1, 1987): 57–66. http://dx.doi.org/10.2143/bab.62.0.2012580.

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AOKI, Ken-ichiro, and Yoichi NAKAMURA. "Petrography and geochemistry of Bandai volcano." Journal of Geography (Chigaku Zasshi) 97, no. 4 (1988): 285–92. http://dx.doi.org/10.5026/jgeography.97.4_285.

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Mason, Robert B., and Edward J. Keall. "Petrography of Islamic Pottery from Fustat." Journal of the American Research Center in Egypt 27 (1990): 165. http://dx.doi.org/10.2307/40000079.

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Hsieh, C. Y. "Some New Methods in Coal Petrography." Bulletin of the Geological Society of China 9, no. 3 (May 29, 2009): 311–20. http://dx.doi.org/10.1111/j.1755-6724.1930.mp9003009.x.

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S V V, Prasad. "Implementation of Petrography of Lightweight Aggregates." International Journal of Civil Engineering 2, no. 5 (May 25, 2015): 32–35. http://dx.doi.org/10.14445/23488352/ijce-v2i5p109.

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LAL, S. "Contact Programme on Art of Petrography." Gondwana Research 4, no. 2 (April 2001): 262. http://dx.doi.org/10.1016/s1342-937x(05)70715-2.

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Dietrich, Dorothee, and Paul R. Grant. "Cathodoluminescence petrography of syntectonic quartz fibres." Journal of Structural Geology 7, no. 5 (1985): 541–53. http://dx.doi.org/10.1016/0191-8141(85)90026-4.

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Mukherjee, D. P., D. K. Banerjee, B. Uma Shankar, and D. Dutta Majumder. "Coal petrography: a pattern recognition approach." International Journal of Coal Geology 25, no. 2 (February 1994): 155–69. http://dx.doi.org/10.1016/0166-5162(94)90026-4.

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Lyons, P. C. "Atlas for coal petrography of China." International Journal of Coal Geology 33, no. 4 (September 1997): 387–88. http://dx.doi.org/10.1016/s0166-5162(97)00002-5.

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O'Brien, G. "Coal characterisation by automated coal petrography⋆." Fuel 82, no. 9 (June 2003): 1067–73. http://dx.doi.org/10.1016/s0016-2361(02)00428-3.

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Matusik, Jakub, and Grzegorz Rzepa. "Department of Mineralogy, Petrography and Geochemistry." Geology, Geophysics & Environment 42, no. 2 (2016): 218. http://dx.doi.org/10.7494/geol.2016.42.2.218.

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Tiwary, Avinash Kumar, Suman Ghosh, Rashmi Singh, Dipti Prasad Mukherjee, B. Uma Shankar, and Pratik Swarup Dash. "Automated coal petrography using random forest." International Journal of Coal Geology 232 (December 2020): 103629. http://dx.doi.org/10.1016/j.coal.2020.103629.

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Karanth, R. V., K. Krishnan, and K. T. M. Hegde. "Petrography of ancient Indian lime plaster." Journal of Archaeological Science 13, no. 6 (November 1986): 543–51. http://dx.doi.org/10.1016/0305-4403(86)90039-7.

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Mason, R. B., and L. Golombek. "The Petrography of Iranian Safavid Ceramics." Journal of Archaeological Science 30, no. 2 (February 2003): 251–61. http://dx.doi.org/10.1006/jasc.2002.0712.

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Journal articles on the topic 'Petrography'

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