Academic literature on the topic 'Aphanitic'

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Journal articles on the topic "Aphanitic"

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Hu, Xinnan, Zheng Tong, Jie Sha, et al. "Effects of Flotation Reagents on Flotation Kinetics of Aphanitic (Microcrystalline) Graphite." Separations 9, no. 12 (2022): 416. http://dx.doi.org/10.3390/separations9120416.

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The flotation method is widely used for the preliminary beneficiation of aphanitic (microcrystalline) graphite. However, there is limited literature regarding the effects of flotation reagents on the flotation kinetics of aphanitic graphite. In this study, six commonly used flotation kinetic models were used to fit the flotation experimental data of aphanitic graphite. The classical first-order model was found to be most suitable for describing flotation kinetics of aphanitic graphite. The modified flotation rate constant (Km) was then applied to evaluate the effects of collector, frother, and inhibitor on aphanitic graphite flotation kinetics. Compared to diesel oil and terpineol oil, kerosene and 2-octanol produced a greater Km. The highest Km was obtained at an inhibitor dosage of 15 mg/L.
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徐, 博会. "Research Status of Metallogenic Mechanism of Aphanitic Graphite." Advances in Geosciences 08, no. 01 (2018): 133–40. http://dx.doi.org/10.12677/ag.2018.81014.

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Jin, Changyu, Xiating Feng, Chengxiang Yang, Dan Fang, Jiangpo Liu, and Shuai Xu. "Application of D-CRDM Method in Columnar Jointed Basalts Failure Analysis." Journal of Applied Mathematics 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/848324.

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Columnar jointed basalt is a type of joint rock mass formed by the combined cutting effect of original joints and aphanitic microcracks. After excavation unloading, such rock mass manifested distinct mechanical properties including discontinuity, anisotropy, and proneness of cracking. On the basis of former research findings, this paper establishes a D-CRDM method applicable to the analysis of columnar jointed basalt, which not only integrates discrete element and equivalent finite-element methods, but also takes into account the coupling effect of original joints and aphanitic microcracks. From the comparative study of field monitoring data and strain softening constitutive model calculated results, it can be found that this method may well be used for the simulation of mechanical properties of columnar jointed basalts and the determination of rock failure mechanism and failure modes, thus providing references for the selection of supporting measures for this type of rock mass.
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Hafidhah Nurul Haq, Mega Fatimah Rosana, Cipta Endyana, Katon Sena Ajie Nugraha, and Irpan Alamsyah. "Geochemistry of Igneous Rocks of Citirem Formation and Its Implications for the Tectonic Setting in Ciletuh – Palabuhanratu UNESCO Global Geopark Area." Journal of Geoscience, Engineering, Environment, and Technology 9, no. 1 (2024): 58–68. http://dx.doi.org/10.25299/jgeet.2024.9.1.14367.

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The igneous rocks of the Citirem Formation in the Ciletuh – Palabuhanratu UNESCO Global Geopark area petrographically not only consist of basalt, but also andesite, dacite, and gabbro. The characteristics of basalts Citirem Formation are composed of plagioclase 43% – 58% and olivine, mostly have amygdaloidal and aphanitic textures. Andesites are composed of 45% – 65% plagioclase, absence of olivine, mostly aphanitic and trachytic, some have intergranular textures. Dacite comprises 50% plagioclase, 20% quartz, and the absence of olivine, and aphanitic, intersertal textures. Gabbros are composed of 62% plagioclase, 6% – 12% olivine, with phaneritic texture. Based on the plot of the major elements vs SiO2 diagram, MgO, FeOt (Fe2O3+FeO), CaO, and TiO2 show a negative correlation with SiO2. In comparison, Na2O and K2O show a positive correlation with SiO2. The lithology of igneous rocks of Citirem Formation are basalt, trachybasalt, basaltic trachyandesite, trachyandesite, andesite, dacite and gabbro based on a plot of the Na2O+K2O vs SiO2 diagram for volcanic and plutonic rocks. The origin of magma type can be distinguished based on the plot of K2O vs SiO2 diagrams, the igneous rocks of Citirem Formation are divided into low-K, medium-K, high-K, and shoshonite magma series. Dacite STA 2, andesite STA 7, basaltic andesite STA 8, trachyandesite STA 10 and gabbro STA 14 are calc-alkaline based on triangular diagram Th-Hf-Ta-Zr-Nb. Gabbro STA 17 indicates IAT (island arc tholeiite), trachybasalt STA 19, basalt STA 20 and basaltic trachyandesite STA 27 are E-MORB, WPT (within plate tholeiitic), In contrast, trachybasalt STA 28 is WPA (within plate alkali). Primitive mantle long, NMORB-normalized REE patterns and chondrites-normalized show some rocks have distinctive patterns that have similarities with suprasubduction zone ophiolite rocks, MORB of Mirdita ophiolite, and some show similarities with patterns from OIB and E-MORB.
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Georgievskiy, A. F., V. M. Bugina, A. A. Georgievskiy, E. V. Karelina, and V. E. Markov. "New Industrial Genetic Type of the Ediacaran Aphanitic Phosphorite Deposits." Lithology and Mineral Resources 59, no. 4 (2024): 462–78. http://dx.doi.org/10.1134/s0024490224700561.

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LI, Jiahui, Xuanlong SHAN, Jian YI, et al. "The Qixiangzhan Lava Flow at the Tianchi Volcano: Eruptive Dynamics, Emplacement Mechanism and Implications for the Formation of Long‐lived Magmatic Systems Prior to Caldera‐forming Eruptions." Acta Geologica Sinica - English Edition 99, no. 1 (2025): 114–25. https://doi.org/10.1111/1755-6724.15271.

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AbstractThe 7 ka old Qixiangzhan lava flow (QXZ, Tianchi volcano) represents the last eruptive event before the 946 CE, caldera‐forming ‘Millennium’ eruption (ME). Petrographic, whole rock, mineral composition, Sr‐Nd isotopic data on QXZ show that: (a) the lava consists of two components, constituted by comenditic obsidian fragments immersed in a continuous, aphanitic component; (b) both components have the same geochemical and isotopic variations of the ME magma. The QXZ and ME comendites result from fractional crystallization and crustal assimilation processes. The temperature of the QXZ magma was about 790°C and the depth of the magma reservoir around 7 km, the same values as estimated for ME. QXZ had a viscosity of 105.5–109 Pa s and a velocity of 3–10 km/yr. The emplacement time was 0.5–1.6 yr and the flow rate 0.48–1.50 m3/s. These values lie within the range estimated for other rhyolitic flows worldwide. The QXZ lava originated through a mixed explosive–effusive activity with the obsidian resulting from the ascent of undercooling, degassing and the fragmentation of magma along the conduit walls, whereas the aphanitic component testifies to the less undercooled and segregated flow at the center of the conduit. The QXZ lava demonstrates the extensive history of the ME magma chamber.
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Reddy, I. V. "A Note on the Occurrence of Ultra-Potassic Volcanic Rocks in the Proterozoic Cuddapah Basin." Journal Geological Society of India 54, no. 5 (1999): 467–71. http://dx.doi.org/10.17491/jgsi/1999/540502.

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Abstract This note records for the first time the occurrence of ultra-potassic volcanic rocks in the Proterozoic Cuddapah basin. The ultra-potassic rocks occur within the tuffaceous sequence of the Pullampet Formation of Nallamalai Group of Cuddapah Supergroup in the area around Naiduvaripalle in Cheyyeru valley in the Cuddapah district of Andhra Pradesh. Petrographic studies reveal that the rock is aphanitic with phenocrysts of alkali feldspar set in a finely crystalline groundmass of slender feldspar microlites and chlorite. The rock displays typical ultra-potassic chemical characters in having high K2O>8%, K2O:Na2O >25% and MgO >3%.
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Shen, Shuling, Junjie Wang, Zhujun Wu, Zheng Du, Zhihong Tang, and Junhe Yang. "Graphene Quantum Dots with High Yield and High Quality Synthesized from Low Cost Precursor of Aphanitic Graphite." Nanomaterials 10, no. 2 (2020): 375. http://dx.doi.org/10.3390/nano10020375.

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It is difficult to keep the balance of high quality and high yield for graphene quantum dots (GQDs). Because the quality is uncontrollable during cutting large 2D nanosheets to small 0D nanodots by top-down methods and the yield is low for GQDs with high quality obtained from bottom-up strategy. Here, aphanitic graphite (AG), a low-cost graphite contains a large amount of small graphite nanocrystals with size of about 10 nm is used as the precursor of graphene oxide quantum dots (GO-QDs) for the first time. GO-QDs with high yield and high quality were successfully obtained directly by liquid phase exfoliating AG without high strength cutting. The yield of these GO-QDs can reach up to 40 wt. %, much higher than that obtained from flake graphite (FG) precursor (less than 10 wt. %). The size of GO-QDs can be controlled in 2–10 nm. The average thickness of GO-QDs is about 3 nm, less than 3 layer of graphene sheet. Graphene quantum dots (GQDs) with different surface properties can be easily obtained by simple hydrothermal treatment of GO-QDs, which can be used as highly efficient fluorescent probe. Developing AG as precursor for GQDs offers a way to produce GQDs in a low-cost, highly effective and scalable manner.
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Li, Yan, Zhao Hui Huang, and Yan Gai Liu. "Study on Mineral Composition and Main Mineral Morphology of Bauxite from ZhongXiang, HuBei Province." Key Engineering Materials 512-515 (June 2012): 648–51. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.648.

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In this paper, the mineral composition and main mineral morphology of bauxite were studied from ZhongXiang deposit, HuBei province. Through Electron Microscope Identification, there are two main rock types, oolitic, bean-like and aphanitic or fine crystalline structure of bauxite. The main mineral morphology is micro-crystalline or flake, crumby forms. The mineral and chemical compositions of samples were investigated by XRD, EPMA analysis tests. The EPMA results showed that Al2O3 content is 47.95% ~ 75.04%, in association with other isomorphous impurities, such as Si, Fe, Ti and Mg in varying proportions. The mineral compositions of bauxite ore are mainly aluminum, iron, silicon minerals, which totally account for from 83.01% to 86.40%. The XRD revealed that diaspore, hematite and kaolinite are the major mineral components in the bauxite ores. The bauxite from ZhongXiang deposits is a type of high diaspore bauxite, partly with clay minerals. Furthermore, the function of bauxite as a good fire-resistant material was discussed.
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Bilgilioğlu, Hacer. "Mineralogical and geochemical characterisation of granite columns from the ancient city of Tyana (Niğde, Türkiye) and implications for their origin." Cultural Heritage and Science 6, no. 1 (2025): 53–65. https://doi.org/10.58598/cuhes.1629100.

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In this article, the mineralogical, petrographic and geochemical properties of the granite columns, which are significant architectural elements in the ancient city of Tyana in the Cappadocia region, are documented and their origins are inferred. Tyana granite columns have porphyro-aphanitic texture and are characterized by mega crystals. The main mineral assemblage in the the granite columns consists of K-feldspar, quartz, plagioclase, biotite, amphibole and accessoy titanite, zircon and opaque minerals. XRD analysis supports the primary mineral assemblage. CRS (Confocal Raman Spectroskopy) studies also revealed that the plagioclase is andesine and amphibolite is actinolite in composition. In addition, geochemical analyses revealed that the granite columns are calc-alkali and granodiorite in composition. In the tectonic evaluation, the granite samples are located in the area of volcanic arc granitoids. According to all analysis results, the Tyana granite columns are compatible with the Horoz granitoids. All the above features will be an important step for the conservation and restoration of future ancient structures.
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Dissertations / Theses on the topic "Aphanitic"

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Sullivan, Martha Nell. "Missing persons: Race and aphanisis in the twentieth-century American novel." Thesis, 1995. http://hdl.handle.net/1911/16888.

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Through images of disintegration and disappearance, American narratives reveal the black subject's problematic relationship to the (white) Other's desire and the language of that desire. Jacques Lacan's theories of subjectivity--especially the mirror stage and aphanisis, the subject's disappearance behind the signifier--illuminate the impact of racist signification on black bodies in twentieth-century American novels, where epithets like "nigger" invoke the mutilation and disappearance of African American subjects. Images of corporal disintegration reveal the reversal of the mirror-stage identification inaugurated by the 1896 Plessy v. Ferguson decision, lynching, and scientific and literary manifestations of Negrophobia. Post-Plessy novels often feature Jim Crow segregation and the "black" body's destruction by the "white" voice. The Negrophobe rape plot infects James Weldon Johnson's The Autobiography of an Ex-Colored Man (1912) after the anonymous narrator is called "nigger." He chooses to "pass" for white after failing to project his disintegration onto his uncanny doubles. In Nella Larsen's Passing (1929), Irene reenacts Lacan's mirror stage by assuming Clare as her idealized image. But "Nig"--the signifier Clare's white husband supplies--invokes Clare's death and undoes Irene, whose final fainting is aphanisis. In William Faulkner's Light in August (1932), Joe Christmas' homicidal violence and suicidal "shattering" represent capitulations to Yoknapatawpha's insistence that he is a "nigger." Exemplary of the literary responses to racist signification since Brown v. Board of Education (1954), Toni Morrison's progression from The Bluest Eye (1970) to Beloved (1987) charts the restoration of voice and body to historically "missing persons" effaced by cultural institutions designed to "teach" them their place. Schooled in the white standards of worth symbolized by the primer motif, characters in The Bluest Eye cannot resist aphanisis; in Beloved, however, characters combat aphanisis by refusing the masters' prerogative to define them. This triumph over aphanisis also emerges in the reappropriation of the black body-in-pieces inspired by Jet magazine's 1955 photographs of Emmett Till's mutilated corpse. Till symbolizes African American integrity in works by Morrison, Gwendolyn Brooks, Madison Jones and others.
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Books on the topic "Aphanitic"

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Verstraten, Peter. Dutch Post-war Fiction Film through a Lens of Psychoanalysis. Amsterdam University Press, 2021. http://dx.doi.org/10.5117/9789463725330.

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Dutch Post-war Fiction Film through a Lens of Psychoanalysis is a sequel to Humour and Irony in Dutch Post-war Fiction Film (AUP, 2016), but the two studies can be read separately. Because of the sheer variety of Fons Rademakers’ oeuvre, which spans ‘art’ cinema and cult, genre film and historical epics, each chapter will start with one of his titles to introduce a key concept from psychoanalysis. It is an oft-voiced claim that Dutch cinema strongly adheres to realism, but this idea is put into perspective by using psychoanalytic theories on desire and fantasy. In the vein of cinephilia, this study brings together canonical titles (Als twee druppels water; Soldaat van Oranje) and little gems (Monsieur Hawarden; Kracht). It juxtaposes among others Gluckauf and De vliegende Hollander (on father figures); Flanagan and Spoorloos (on rabbles and heroes); De aanslag and Leedvermaak (on historical traumas); and Antonia and Bluebird (on aphanisis).
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Hwanghol han ap'anisisŭ: Sichŏk yulli ŭi simjangbu = Aphanisis in ratures : the heart of poetics ethics. Somyŏng Ch'ulp'an, 2019.

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Verstraten, Peter. Dutch Post-War Fiction Film Through a Lens of Psychoanalysis. Amsterdam University Press B.V., 2021. http://dx.doi.org/10.5040/9789048561773.

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Dutch Post-war Fiction Film through a Lens of Psychoanalysis is a sequel to Humour and Irony in Dutch Post-war Fiction Film (AUP, 2016), but the two studies can be read separately. Because of the sheer variety of Fons Rademakers’ oeuvre, which spans ‘art’ cinema and cult, genre film and historical epics, each chapter will start with one of his titles to introduce a key concept from psychoanalysis. It is an oft-voiced claim that Dutch cinema strongly adheres to realism, but this idea is put into perspective by using psychoanalytic theories on desire and fantasy. In the vein of cinephilia, this study brings together canonical titles (Als twee druppels water; Soldaat van Oranje) and little gems (Monsieur Hawarden; Kracht). It juxtaposes among others Gluckauf and De vliegende Hollander (on father figures); Flanagan and Spoorloos (on rabbles and heroes); De aanslag and Leedvermaak (on historical traumas); and Antonia and Bluebird (on aphanisis).
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Book chapters on the topic "Aphanitic"

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"aphanitic." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_12241.

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"aphanitic, adj." In Oxford English Dictionary, 3rd ed. Oxford University Press, 2023. http://dx.doi.org/10.1093/oed/1169158592.

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"aphanistic, adj." In Oxford English Dictionary, 3rd ed. Oxford University Press, 2023. http://dx.doi.org/10.1093/oed/1044730586.

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"Aphanisis." In Dutch Post-war Fiction Film through a Lens of Psychoanalysis. Amsterdam University Press, 2021. http://dx.doi.org/10.2307/j.ctv1kwxdgx.13.

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"aphanite." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_12239.

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"aphanite-schist." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_12240.

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"CHAPTER 8. Aphanisis." In Dutch Post-war Fiction Film through a Lens of Psychoanalysis. Amsterdam University Press, 2021. http://dx.doi.org/10.1515/9789048551729-010.

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"Nemesis and Aphanisis." In The Face of Immortality. State University of New York Press, 2012. http://dx.doi.org/10.2307/jj.18254657.11.

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"aphanite | aphanyte, n." In Oxford English Dictionary, 3rd ed. Oxford University Press, 2023. http://dx.doi.org/10.1093/oed/8906008327.

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"Nemesis and Aphanisis." In The Face of Immortality. SUNY Press, 2012. http://dx.doi.org/10.1515/9780791484241-008.

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Reports on the topic "Aphanitic"

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Charusiri, Punya, Wasant Pongsapich, and Chakkaphan Sutthirat. Petrochemistry of probable gem-bearing basalts in Sop Prap-Ko Kha Area, Changwat Lampang : research report. Chulalongkorn University, 1996. https://doi.org/10.58837/chula.res.1996.17.

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The project area covers approximately 300 km[superscript 2] encompassing parts of Amphoe Sop Prap, Amphoe Ko Kha, and Amphoe Mae Tha of Changwat Lampang. The area is mainly occupied by sedimentary (and metamorphic) rocks of Permian, Triassic, Tertiary and Quaternary ages. The Triassic rocks include the Phra That, the Pha Kan, and the Hong Hoi Formations of the Lampang Group. Igneous rocks comprise Permo-Triassic volcanics, Triassic granodiorite, and Cenozoic basalts. Sapphires are frequently found in alluvial and residual deposits, particularly in the northern basaltic area. Sapphires in the south terrain are also encountered in stream channels flowing from nearby Cenozoic basaltic crater. Sapphires are normally blue, dark blue, greenish blue, and dark brown, and occur as angular to subangular forms, ranging size from 0.5 to 6 cm. Basalts in the project area can be geographically subdivided into 2 terrains the north and the south. The northern terrain (Nam Cho Basalt) covers approximately 3 km[superscript 2] in Thambon Nam Cho, Amphoe Mae Tha. The basalts occur as one major flow layer, that flowed following the hill slope. The rocks are characterized by reddish brown vesicular rocks (top), and black dense rocks (bottom). They are generally present as fine-grained and porphyritic. Ultramafic nodules of lherzolite comprising olivine, pyroxene and spinel and megacrysts of olivine, and pyroxene, are often observed in this terrain. Microscopically, the northern basalts invariability occur as microporphyritic to porphyritic, aphanitic. Phenocrysts of olivine and pyroxene are generally surrounded by small plagioclase- microlite groundmass and glass. The basalts are typically composed of plagioclase, pyroxene, olivine, opaque minerals, and other accessories. Average grain size is relatively smaller than that of the south basalts. The southern terrain (Sop Prap-Ko Kha Basalt) can be subdivided into 5 flow layers. Good exposures are typically present at road cut quarries between kms 586-569 on the highway number 1, nearby the volcanic crater. The area covers approximately 55 km[superscript 2] between Amphoe Ko Kha and Amphoe Sop Prap. These five basaltic flows are similarly characterized by vesicular, or massive, microporphyritic-porphyritic, fine-grained to aphanitic rocks. Phenocrysts of oviline frequently occur in most flows. These basalt flows microscopically comprise similar characteristics, mostly they always contain plagioclase, pyroxene, olivine, opaque minerals, and other accessories. Intersertal, and subophitic textures are frequently present in these basalts. Ultramafic nodules are rarely found in this basaltic terrain. Geochemically, that Nam Cho and Sop Prap-Ko Kha Basalts can be clearly divided by difference in major and trace- element contents. Though several variation diagrams display similar trend. The Nam Cho basalts are mainly classified as basanite, where as the Sop Prap-Ko Kha basalts are dominantly alkaline-olivene basalt base on normative plagioclase and hyperstene and/or nepheline. Rare-earth element concentrations show similar chondrite-normalized patterns for most basalt groups. Calculated Mg-values indicate crystal fractionation process of the derivative magmas. [superscript40] Ar/[superscript 39] Ar geochronological data are clearly concluded that Sop Prap-Ko Kha Basalts, ranging in age from younger than 2.30 to 2.41 Ma, are older than Nam Cho Basalts (ca. 2.02 Ma). Therefore, it is tentatively inferred that basalts from both terrains were probably originated from derivative magmas, which are evolved by similar processes, as crustal fraction with subsequent crustal contamination process. However, these derivate magmas may have been derived from different originated sources and primary magmas with low degree of partial melting in mantle. The occurrence of sapphires possibly indicates partial melting of primary magma at high depth and pressure, and crustal fractionations of derivative magma route to 8-10 kbar. Then Nam Cho Basalt can be regarded as gem-related and formed different derivative magma from mantle source region.
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