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Journal articles on the topic 'Petrographic'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Chen, Zhongliang, Feng Yuan, Xiaohui Li, et al. "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 (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 o

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2

Geschwind, Carl-Henry. "The Beginnings of Microscopic Petrography in the United States, 1870-1885." Earth Sciences History 13, no. 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 am

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3

VOYTEKHOVSKY, Yury, and Alena ZAKHAROVA. "Petrographic structures and Hardy – Weinberg equilibrium." Journal of Mining Institute 242 (June 10, 2020): 133. http://dx.doi.org/10.31897/pmi.2020.2.133.

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The article is devoted to the most narrative side of modern petrography – the definition, classification and nomenclature of petrographic structures. We suggest a mathematical formalism using the theory of quadratic forms (with a promising extension to algebraic forms of the third and fourth orders) and statistics of binary (ternary and quaternary, respectively) intergranular contacts in a polymineralic rock. It allows constructing a complete classification of petrographic structures with boundaries corresponding to Hardy – Weinberg equilibria. The algebraic expression of the petrographic stru

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4

Ownby, Mary F., James M. Heidke, and Henry D. Wallace. "New Insights into Hohokam Buff Ware Production and Distribution." American Antiquity 80, no. 2 (2015): 387–96. http://dx.doi.org/10.7183/0002-7316.80.2.387.

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Hohokam buff ware pottery produced in Arizona has been much studied over the last few decades. However, petrographic analysis has been less frequently applied, due in part to mistaken assumptions regarding the raw materials utilized. The current study reexamined the use of petrography for locating the provenance of buff ware pottery from two sites, La Villa in the Phoenix area and Honey Bee Village in the Tucson area. The petrographic results suggest that production occurred in one primary area along the middle Gila River with minor production in a few other locations. The potters in this area

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5

Nikitenko, I. S., V. N. Stepanchuk, and V. I. Ganotskiy. "On the earliest evidence of the middle Dnipro area non-flint rocks use." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 5 (October 30, 2022): 5–11. http://dx.doi.org/10.33271/nvngu/2022-5/005.

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Purpose. To determine the rock composition and origin of raw materials of non-flint stone products found during the study on the Mira Upper Palaeolithic archaeological site in the Middle Dnipro area. Methodology. The research on the artefacts was carried out using the mineralogical and petrographic methods. The rocks were studied in transparent thin sections using a polarized microscope. To verify the accuracy of the petrographic analysis of some specimens, the XRD and XRF methods were applied. Establishing the provenance of the rocks was performed using comparative mineralogical and petrograp

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6

Voytekhovsky, Yuri Leonidovich, and Alena Alexandrovna Zakharova. "Petrographic structures: Khibiny ijolites and urtites." Vestnik MGTU 24, no. 2 (2021): 160–67. http://dx.doi.org/10.21443/1560-9278-2021-24-2-160-167.

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In addition to the standard description of the structures and textures of crystalline rocks the mathematical approaches have been proposed based on a rigorous determination of the petrographic structure through the probabilities of binary intergrain contacts. In general, the petrographic structure is defined as an invariant aspect of rock organization, algebraically expressed by the canonical diagonal form of the symmetric Pij matrix and geometrically visualized by structural indicatrices - surfaces of the 2nd order. The agreed nomenclature of possible petrographic structures for an n-mineral

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7

Abel, M. "PetroGrapher: managing petrographic data and knowledge using an intelligent database application." Expert Systems with Applications 26, no. 1 (2004): 9–18. http://dx.doi.org/10.1016/s0957-4174(03)00104-0.

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8

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 degree

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9

Измайлов, Д. Я., та Ю. Р. Селюминова. "ОЦЕНКА ЭФФЕКТИВНОСТИ ПРИМЕНЕНИЯ СЕГМЕНТАЦИИ ИЗОБРАЖЕНИЙ С ИСПОЛЬЗОВАНИЕМ НЕЙРОННЫХ СЕТЕЙ ПРИ ОПТИКО-ПЕТРОГРАФИЧЕСКОМ АНАЛИЗЕ ГОРНЫХ ПОРОД И МИНЕРАЛЬНОГО СЫРЬЯ". Prospect & protection of mineral resources, № 3 (24 червня 2025): 50. https://doi.org/10.53085/0034-026x_2025_3_50.

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В статье показаны возможности современного комплекса минералого-аналитических методов при решении задач петрографии с использованием нейронных сетей на примере дешифровки изображений петрографических препаратов методом сегментации, а также целесообразность данного метода, использующего алгоритмы машинного обучения для анализа прозрачных петрографических шлифов в проходящем поляризованном свете. Минералогические исследования проводились в соответствии с методической документацией, утвержденной Научным советом по минералогическим методам исследования [3]. Элементом новизны является методический

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10

Voytekhovsky, Yu L., and A. A. Zakharova. "Modeling petrographic structures." Vestnik of Geosciences 10 (2020): 38–42. http://dx.doi.org/10.19110/geov.2020.10.5.

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The article describes a technique for 2D modeling of structures and textures of bimineral rocks in terms of the probabilities of binary intergranular contacts. It is shown that typical petrographic structures (disseminated, chained, poikilitic, porphyric) and textures (massive, banded, schlieren) regularly fill the barycentric diagram (pii, pjj, pij) of contact probabilities. These structures and textures are correlated with the Hardy-Weinberg equilibrium. The problems of modeling polymineral petrographic structures and textures are discussed. A new type of structural diagrams is suggested. Th

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11

Reffner, John A. "Correlated Petrographic Analysis." Microscopy and Microanalysis 20, S3 (2014): 1720–21. http://dx.doi.org/10.1017/s1431927614010332.

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12

Childs, S. Terry. "Petrographic Analysis of Archaeological Ceramics." MRS Bulletin 14, no. 3 (1989): 24–29. http://dx.doi.org/10.1557/s0883769400063144.

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Petrographic analysis is not new to the study of archaeological ceramics, but it is receiving more attention as it is applied to interesting and diverse archaeological problems. Petrography was developed by geologists to identify minerals in rocks. Archaeologists use it to study the minerals that occur in prehistoric clay matrices transformed by heat to a rocklike state.Petrographic analysis requires a polarizing microscope and a piece of ceramic, called a thin section, 30 microns (0.03 mm) thick. As light from this specialized microscope passes through a mineral, it produces optical propertie

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13

Hingue, Ngambi Victor, Jean Claude Doumnang Mbaigané, Mbaguedje Diondoh, and Diontar Mbaihoudou. "Petrography and Geochemistry of the Farchana-Hadjerhadid Granitoids (Ouaddaï Massif, Eastern Chad)." European Journal of Environment and Earth Sciences 5, no. 4 (2024): 8–15. http://dx.doi.org/10.24018/ejgeo.2024.5.4.473.

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Work in the Farchana-Hadjerhadid sector is focused on petrography, with the main aim of mapping the geological formations of the eastern Ouaddaï Massif in order to identify petrographic types and gain an understanding of the geodynamic history of this area. The fieldwork showed that the Farchana-Hadjerhadid granitoids consist mainly of granites and diorites and are intersected by numerous pegmatite veins. Microscopic observation shows that the diorite is made up of plagioclase, amphibole, biotite, and quartz. The granite is composed of alkali feldspar, quartz, amphibole, plagioclase, and biot

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14

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 b

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15

Farhan, M. L., and D. H. Amijaya. "Petrographic composition of coke product from Batu Ayau Formation Coking Coal, Kutai Basin, Central Kalimantan." IOP Conference Series: Earth and Environmental Science 851, no. 1 (2021): 012051. http://dx.doi.org/10.1088/1755-1315/851/1/012051.

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Abstract The Batu Ayau Formation in the Kutai Basin has coking coal deposits that have the potential to be processed into coke. Analysis using organic petrography method is an important parameter to identify the composition of the coke product to determine the coke quality. The purpose of this study was to determine the composition of the coke products made from coking coal of Batu Ayau Formation in Kutai Basin, Central Kalimantan. Petrographic analysis on 12 samples obtained in Kal-Teng seam showed that the percentage of coke products varied. Carbon in the binder phase is 85.60 - 92 vol.%, th

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16

Nule, H. C., N. Egesi, and J. N. Onwualu-John. "Petrography of basement rocks in parts of Ikom and Iso – Bendeghia, Southeastern Nigeria." Scientia Africana 23, no. 3 (2024): 465–72. http://dx.doi.org/10.4314/sa.v23i3.41.

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The petrography of somepetrography of basement rocks in parts of Ikom and Iso – Bendeghia, in Cross Rivers State, Southeastern Nigeria were evaluated. The rock samples collected from the study area were subjected to field observation delineate the parameters for their field names and petrographic evaluation to decipher in common mineral composition of the rock samples. Thin sections were prepared from rock samples collected from the sample points in the area to estimate the percentage composition of minerals. This petrographic study was able to decipher rock type within the study area. The bas

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17

Sajid, Syed Muhammad Waseem, Mukhtar S. Ahmad, Emad Ullah Khan, and Maria Sabir. "Petrographic and Physiomechanical Investigation of Late Cretaceous Kawagarh Formation Kahi Section, Nizampur Basin." International Journal of Economic and Environmental Geology 12, no. 4 (2022): 51–56. http://dx.doi.org/10.46660/ijeeg.vol12.iss4.2021.650.

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The late Cretaceous Kawagarh Formation has been investigated in terms of field observation, and petrographic analysis, to understand the petrography and its impact on the geotechnical properties. The Kawagarh Formation is well exposed among the upper Indus Basin, and has been studied by various workers in different aspects. Kawagarh Formationexposed in Kahi section of Nizampur Basin has been selected in this study to know the behavior of carbonate rocks for engineering purposes. Lithologically, this formation is composed of thick to medium bedded, highly fractured limestone, marls, and dolomit

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18

Ahmad, Mukhtar S., Syed Muhammad Waseem Sajjad, Emad Ullah Khan, and Maria Sabir. "Petrographic and Physiomechanical Investigation of Late Cretaceous Kawagarh Formation Kahi Section, Nizampur Basin." International Journal of Economic and Environmental Geology 12, no. 4 (2023): 51–56. http://dx.doi.org/10.46660/ijeeg.v12i4.74.

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The late Cretaceous Kawagarh Formation has been investigated in terms of field observation, and petrographic analysis, to understand the petrography and its impact on the geotechnical properties. The Kawagarh Formation is well exposed among the upper Indus Basin, and has been studied by various workers in different aspects. Kawagarh Formation exposed in Kahi section of Nizampur Basin has been selected in this study to know the behavior of carbonate rocks for engineering purposes. Lithologically, this formation is composed of thick to medium bedded, highly fractured limestone, marls, and dolomi

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19

Fedorova, Natalia I., Natalia A. Grabovaya, and Zinfer R. Ismagilov. "PETROGRAPHIC CHARACTERISTIC OF ANTHRACITE." Vestnik of Kuzbass State Technical University, no. 2 (April 29, 2021): 62–67. http://dx.doi.org/10.26730/1999-4125-2021-2-62-67.

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20

Petrov, O. V., O. A. Bogatikov, L. N. Sharpenok, and A. M. Kurchavov. "Petrographic code of Russia." Petrology 18, no. 7 (2010): 649–56. http://dx.doi.org/10.1134/s0869591110070015.

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21

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 o

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22

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 (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

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23

Alaba Oyeshomo, Anthony Victor. "EVIDENCE OF POST-CRYSTALLIZATION DUCTILE DEFORMATION IN PLUTONIC CHARNOCKITES AROUND IKARE, SOUTHWESTERN, NIGERIA." Malaysian Journal of Geosciences 7, no. 2 (2023): 150–53. http://dx.doi.org/10.26480/mjg.02.2023.150.153.

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Charnockites could be of magmatic, metamorphic, or metasomatic origin and formed in varying tectonic settings. Lack of detailed geological mapping of plutonic charnockites around Ikare necessitated this work. Hence, this study was designed to investigate the petrography of plutonic charnockites, in order to infer post-cystallization event that prevailed in the area. Ten (10) chip rock samples purposively collected were prepared into thin and polished sections for petrographic studies using petrological microscope. The mineral assemblages observed are quartz, plagioclase feldspar, alkali feldsp

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24

Moye, Charles D., and Michael M. Msabi. "Mineralogical and geochemical characteristics of graphite-bearing rocks at Chenjere Area, south-eastern Tanzania: Implications for the nature and quality of graphite mineralization." Tanzania Journal of Science 47, no. 2 (2021): 535–51. http://dx.doi.org/10.4314/tjs.v47i2.11.

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This study focused on the mineralogical and geochemical characteristics of graphite-bearing rocks at Chenjere area by conducting surface geological mapping, geochemical and petrographical analyses with the intention of characterizing the nature of graphite occurrence in these lithological units. This paper presents results of the flake size, grade and mineralization extension of graphite in the graphitic gneiss. Field observations, petrographic investigation and comparison with other studies indicate that graphite occurrence at the Chenjere area is of sedimentary origin which fall under syngen

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25

Kutllovci, Festim, and Islam Fejza. "Petrographic characteristics in the central part of Kosovo." Mining of Mineral Deposits 15, no. 4 (2021): 139–44. http://dx.doi.org/10.33271/mining15.04.139.

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Purpose. This paper aims to provide complete identification of rock types in the Drenas region by detailed description of all types of the rocks found. The authors intended to determine interruption or continuity of all inter-formational boundaries to accurately delineate them on the ground and fully reflect on the 1: 25000 scale map, as well as to identify the nature of contact between rock types and give its detailed description. Methods. During August, September, October of 2019, the exploration field trips were carried out. Geological survey works focused on the following areas: complete i

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Cheng, Wei, Ruidong Yang, and Qin Zhang. "Origin of a Petrographic Coal Structure and Its Implication for Coalbed Methane Evaluation." Minerals 10, no. 6 (2020): 543. http://dx.doi.org/10.3390/min10060543.

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A petrographic coal structure of Late Permian coals from the Liupanshui coalfield, Western Guizhou, SW China, has been distinguished for its novel macro-lithological characteristics. Petrographic, mineralogical and geochemical studies have been conducted for a typical coal sample (No.3 coal, Songhe coalmine, Panzhou County, China) and its geological genesis and significance for coalbed methane (CBM) evaluation is accordingly discussed. It was found that coal is characterized by a banded structure with intensively fractured vitrain sublayers, where a great number of fractures were developed and

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27

Saif Ur Rehman. "Outcrop geology, microfacies analysis and depositional environments of Chorgali Formation from Bhattian and Gharaga, Southern Hazara basin Pakistan." Pakistan Journal of Science 76, no. 01 (2024): 106–17. http://dx.doi.org/10.57041/pjs.v76i01.1089.

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In Hazara Basin, Early Eocene is represented by carbonate succession of Chorgali Formation which is mainly composed of limestone with marls and calcareous shale. Limestone is predominantly marly and argillaceous in nature. Two Stratigraphic sections of Chorgali Formation exposed at Gharaga and Bhattian villages have been completely examined and sampled for outcrop characteristics, petrography, microfacies and depositional settings. These sections have both well preserved lower and upper contacts with Early Eocene Margalla Hill limestone and Middle Eocene Kuldana Formation, respectively. The pe

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Bennett, Mitchell M., Thomas Monecke, T. James Reynolds, and Nigel M. Kelly. "RECOGNITION OF PORPHYRY QUARTZ IN STREAM SEDIMENTS BY FLUID INCLUSION PETROGRAPHY AND CATHODOLUMINESCENCE MICROSCOPY: RESULTS OF SYSTEMATIC DISPERSION STUDIES AND POTENTIAL APPLICATIONS IN PORPHYRY EXPLORATION." Economic Geology 119, no. 3 (2024): 713–24. http://dx.doi.org/10.5382/econgeo.5062.

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Abstract Regional stream sediment surveys are an important exploration tool used in the search for concealed or partially concealed porphyry deposits. It is shown here that quartz contained in the coarse fraction of stream sediments can be used as an indicator mineral to supplement geochemical analyses conducted on the fine fraction, such as the measurement of the bulk cyanide leach extractable gold content. A method is proposed that allows separation of quartz grains from the coarse rejects of stream sediment samples to prepare grain mounts for petrographic analysis. Based on optical cathodol

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Saif Ur Rehman. "Outcrop geology, microfacies analysis and depositional environments of Chorgali Formation from Bhattian and Gharaga, Southern Hazara basin Pakistan." Pakistan Journal of Science 76, no. 01 (2024): 106–17. https://doi.org/10.57041/vol76iss01pp106-117.

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In Hazara Basin, Early Eocene is represented by carbonate succession of Chorgali Formation which is mainly composed of limestone with marls and calcareous shale. Limestone is predominantly marly and argillaceous in nature. Two Stratigraphic sections of Chorgali Formation exposed at Gharaga and Bhattian villages have been completely examined and sampled for outcrop characteristics, petrography, microfacies and depositional settings. These sections have both well preserved lower and upper contacts with Early Eocene Margalla Hill limestone and Middle Eocene Kuldana Formation, respectively. The pe

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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 (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 acr

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Voytekhovsky, Yu L., A. A. Zakharova, and M. D. Klimochenkov. "Modeling petrographic structures. Paper 2." Vestnik of Geosciences 12 (2020): 32–35. http://dx.doi.org/10.19110/geov.2020.12.3.

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For the purposes of modeling and classification of structures and textures of bimineral rocks, a diagram of a new type is proposed — a barycentric tetrahedron (piii, piij, pijj, pjjj) of probabilities of ternary intergrain contacts. The position of the Hardy-Weinberg equilibrium line is calculated. Correspondences between the classification fields and boundaries in the barycentric tetrahedron and the previously proposed barycentric triangle (pii, pij, pjj) of the probabilities of binary intergrain contacts are established. The prospects for the classification of petrographic structures and tex

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32

SUNAMI, Yoshihiko, and Mikio KATO. "An automated coal petrographic analysis." Journal of the Fuel Society of Japan 64, no. 2 (1985): 90–99. http://dx.doi.org/10.3775/jie.64.90.

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33

Fedorova, Natalia I., Natalia A. Grabovaya, Zinfer R. Ismagilov, and Zinfer R. Ismagilov. "PETROGRAPHIC ANALYSIS OF BROWN COALS." Vestnik of Kuzbass State Technical University 134, no. 4 (2019): 70–76. http://dx.doi.org/10.26730/1999-4125-2019-4-70-76.

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34

Hibbard, M. J. "Petrographic Classification of Crystal Morphology." Journal of Geology 102, no. 5 (1994): 571–81. http://dx.doi.org/10.1086/629699.

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35

Sheksheev, M. A., S. V. Mikhailitsyn, A. B. Sychkov, V. A. Bigeev, and S. V. Naumov. "Petrographic Study of Welding Slags." Russian Metallurgy (Metally) 2020, no. 6 (2020): 659–61. http://dx.doi.org/10.1134/s0036029520060166.

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36

Hutton, Adrian C. "Petrographic classification of oil shales." International Journal of Coal Geology 8, no. 3 (1987): 203–31. http://dx.doi.org/10.1016/0166-5162(87)90032-2.

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37

STARKEY, J., and A. K. SAMANTARAY. "Edge detection in petrographic images." Journal of Microscopy 172, no. 3 (1993): 263–66. http://dx.doi.org/10.1111/j.1365-2818.1993.tb03421.x.

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38

Boye Bork, Jepsen, and Christensen Preben. "Petrographic examination of hardened concrete." Bulletin of the International Association of Engineering Geology 39, no. 1 (1989): 99–103. http://dx.doi.org/10.1007/bf02592541.

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39

Parra-Fernández, C., and M. J. Varas-Muriel. "Petrographic and petrophysical characterization of the main aerial and hydraulic mortars used in the construction and rehabilitation sectors." Materiales de Construcción 75, no. 357 (2025): e367. https://doi.org/10.3989/mc.2025.379124.

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Petrographic and petrophysical characterization of aerial and hydraulic mortars allows their differentiation and the establishment of their most suitable applications. Natural, aerial or hydraulic lime mortars as well as artificial cements mortars present different physical properties. It shall be noted that physical characteristics, which depend on petrographic characteristics, impact on its mechanical properties. Therefore, this comparative study with standardised techniques and tests, has analysed these mortars from a petrographic, petrophysical and mechanical point of view. The chemical pr

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Wang, Zhenkang, Jiangfeng Chen, Wenping Li, et al. "Relationship between petrographic parameters and physical-mechanical properties of weakly cemented sandstones." Quarterly Journal of Engineering Geology and Hydrogeology 54, no. 1 (2020): qjegh2018–168. http://dx.doi.org/10.1144/qjegh2018-168.

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Petrographic characteristics (textural properties and modal compositions) have an intrinsic influence on the physical and mechanical (PM) properties of weakly cemented sandstones. Sixteen sandstone samples were tested to determine the PM parameters and then thin sections from those samples were used to measure the petrographic parameters. Petrographic parameters were analysed statistically to establish quantitative relationships between the petrographic characteristics and PM properties. Based on multiple linear regression (MLRA) and stepwise multiple regression analyses (SMRA), several multip

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Mytrokhyn, O. V., D. S. Chertova, and V. G. Bakhmutov. "PETROLOGY OF GABBROIDS OF GIRARD BAY (KYIV PENINSULA, GRAHAM COAST OF THE WEST ANTARCTICA)." Mineralogical Journal 46, no. 2 (2024): 54–66. http://dx.doi.org/10.15407/mineraljournal.46.02.054.

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Several new gabbroid intrusions were discovered in the process of geological surveying in the area of the Ukrainian research station in the West Antarctica. One of them is located in the hard-to-reach Girard Bay on the western coast of the Kyiv Peninsula. The authors investigated the mode of occurrence, petrography and mineral chemistry of Girard Bay gabbroids in order to clarify their geological position and petrogenetic conditions of their formation. It was found that the newly discovered gabbroids make up a stock-like intrusive body with a horizontal dimension of more than 3 km. Gabbroids u

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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 fragme

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P., R. C. Phani, Sreenu K., and Ningam N. "Field Geological and Petrographic Study of Granitic Rocks around Devadurga, Eastern Dharwar Craton, Southern India." International Journal of Trend in Scientific Research and Development 2, no. 5 (2018): 2248–54. https://doi.org/10.31142/ijtsrd18227.

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Field geological and petrographic characteristics of granitic rocks and their variants exposed at Devadurga town, Raichur district, Karnataka are described. The granitic rocks of Devadurga are part of younger 'Closepet granite' within a country of Peninsular Gneissic Complex PGC of Archaean age. Based on field and petrographic observations of this investigation, the younger granitic rocks of 'Closepet granite' within the study area can be sub divided into leucogranite, grey porphyritic granite, pink granite, pink biotite granite, grey biotite granite, pink porphyritic granite.

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Frascá, Maria H. B. O. "Considerations on Granite Dimension Stone Porosity and Modifications from Quarry to Slabs." Key Engineering Materials 548 (April 2013): 124–31. http://dx.doi.org/10.4028/www.scientific.net/kem.548.124.

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This paper presents the physical and petrographic characterization of selected granitic rock types from several quarries in Brazil and aims to contribute to a better knowledge of the engineering properties of granite dimension stone, focusing on laboratory physical determinations and the possible changes that would occur along processing operations, i.e., from the quarried rock to the polished slabs or tiles. The tests – petrography and porosity determinations – led to the collection of parameters of in natura and processed rock material, respectively from specimens obtained from small cubic b

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Ribolini, Adriano, Alessandro Chelli, Mauro Guglielmin, and Marta Pappalardo. "Relationships between glacier and rock glacier in the Maritime Alps, Schiantala Valley, Italy." Quaternary Research 68, no. 3 (2007): 353–63. http://dx.doi.org/10.1016/j.yqres.2007.08.004.

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AbstractIn the Schiantala Valley of the Maritime Alps, the relationship between a till-like body and a contiguous rock glacier has been analyzed using geomorphologic, geoelectric and ice-petrographic methodologies. DC resistivity tomographies undertaken in the till and in the rock glacier show the presence of buried massive ice and ice-rich sediments, respectively. Ice samples from a massive ice outcrop show spherical gas inclusions and equidimensional ice crystals that are randomly orientated, confirming the typical petrographic characteristics of sedimentary ice. The rock glacier formation b

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Williams, John, and David Jenkins. "A Petrographic Investigation of a Corpus of Bronze Age Cinerary Urns from the Isle of Anglesey." Proceedings of the Prehistoric Society 65 (1999): 189–230. http://dx.doi.org/10.1017/s0079497x00001997.

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The results are presented of a comprehensive petrographic study of 82 Bronze Age cinerary vessels from the Isle of Anglesey, Wales. Petrographic analysis is particularly appropriate when applied to this island location with its diverse and well defined geology. The pottery is characterised by a distinctive range of clasts, of which the most characteristic are varieties of igneous rocks and sandstone. The clasts can be matched to outcrops on the island with one exception which could have been derived from a known mainland source. The particular rock types seen in the pottery are not common in t

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Bordoloi, Anannya, Ananya Chutia, and Chaitra Dhar Taye. "Reservoir characterization and rock eval pyrolysis of clastic sedimentary rocks in the Geku Formation, Arunachal Pradesh, North-eastern India." Indian Association of Sedimentologists 40, no. I (2023): 43–54. http://dx.doi.org/10.51710/jias.v40ii.284.

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The present investigation aims to decipher the reservoir quality and source rock potential of the sandstones and shales of the Geku Formation of the Yinkiong Group, Eastern Himalaya, NE India. To achieve the goal, sandstone petrography and rock-eval pyrolysis of shale aided with X-Ray diffraction have been employed. A petrographic study revealed that the detrital constituent of the sandstones is mainly quartz, feldspar, and lithic fragments. Authigenic cements such as carbonate and clay bind the detrital materials as indicated by petrographic as well as X-Ray diffraction study. Clay minerals i

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Zakharova, A. A., Yu L. Voytekhovsky, A. A. Kompanchenko, and Yu N. Neradovsky. "Methodology for determination of petrographic structures using the MIU-5M device." Vestnik MGTU 25, no. 1 (2022): 5–11. http://dx.doi.org/10.21443/1560-9278-2022-25-1-5-11.

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The authors develop a statistical method for determining the structures of rocks. A mathematically rigorous definition of the petrographic structure through the probabilities of binary intergranular contacts is proposed. The petrographic structure is defined as an invariant aspect of rock organization algebraically expressed by the canonical diagonal form of symmetric matrix of contact probabilities and visualized by structural indicatrices - 2 order surfaces. A consistent nomenclature of petrographic structures has been proposed. Earlier the method showed itself well in describing the structu

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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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Oyen, Craig W., Kendall B. Fountain, Guerry H. McClellan, and James L. Eades. "Thin-Section Petrography of Concrete Aggregates: Alternative Approach for Petrographic Number Evaluation of Carbonate Aggregate Soundness." Transportation Research Record: Journal of the Transportation Research Board 1619, no. 1 (1998): 18–25. http://dx.doi.org/10.3141/1619-03.

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Traditional petrographic number (PN) ratings of concrete aggregates cannot work reliably in Florida because most of the state’s rocks are too fine-grained for use of macroscopic petrographic evaluations. This study designed a thin-section approach to PN calculations, based on relevant carbonate rock components that can be seen easily in thin section. The primary lithologic features chosen to differentiate the carbonates are the types of allochems, the porosity type, the kind of cement or matrix, and any additional noncarbonate minerals. Ten sets of aggregate samples were examined (eight carbon

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