Journal articles: 'Petrologie'

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STOOPS, G. "Petrologie des Laterites et des Sols Tropicaux." Soil Science 158, no. 3 (September 1994): 228. http://dx.doi.org/10.1097/00010694-199409000-00010.

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Tanumihardja, Suwardi, Karl W. Strauss, and Georg Müller. "Petrology of Lower Carboniferous Spilites of the NE-Lahn Syncline/Rheinisches Schiefergebirge." Zeitschrift der Deutschen Geologischen Gesellschaft 137, no. 2 (January 1, 1986): 465–87. http://dx.doi.org/10.1127/zdgg/137/1986/465.

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Ngounouno, Ismaila, Christian Moreau, Bernard Deruelle, Daniel Demaiffe, and Raymond Montigny. "Petrologie du complexe alcalin sous-sature de Kokoumi (Cameroun)." Bulletin de la Société Géologique de France 172, no. 6 (November 1, 2001): 675–86. http://dx.doi.org/10.2113/172.6.675.

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Abstract The Cameroon Line was created by the rejuvenation, at the beginning of the opening of the Atlantic Ocean, of a Pan-African N070 degrees E fracture zone [Moreau et al., 1987], which acted as a huge lithospheric crack taping a hot asthenospheric zone [Deruelle et al., 1998; Marzoli et al., 2000]. The Kokoumi anorogenic pluton belongs to the E-W Garoua rift structure, which represents the easternmost extension of the Benue trough. The Garoua rift opened during the Neocomian-Lower Aptian ages [Benkhelil, 1988] through the rejuvenation of Pan-African normal faults. The rift subsided, was partially filled by conglomerates and sandstones, and the ensemble was folded in the Cretaceous period [Guiraud, 1993]. Post-Cretaceous faulting affected these sediments. Intrusion of the Kokoumi anorogenic complex through the Cretaceous sandstones was favoured by N-S, N070 degrees E, E-W and N135 degrees E faults and N030 degrees E extension [Moreau et al., 1987]. The Kokoumi complex was first described by Koch [1959]. It is composed of a plutonic gabbro-nepheline monzosyenite-nepheline syenite series and of lamprophyric dykes (monchiquites and camptonites). One trachyte dyke is also observed. The gabbros are olivine (Fo 70 )-, nepheline-, or kaersutite-bearing gabbros. They also contain Ti-Al-rich diopside, Ti-rich biotite, titanite, ilmenite, Ti-magnetite and apatite. The nepheline monzosyenites contain diopside, Fe-diopside, kaersutite, Fe-kaersutite, titanite and apatite. The nepheline syenites contain aegirine-augite, F-rich arfvedsonite and aenigmatite. Kaersutite and clinopyroxene predominate in the lamprophyres. Monchiquites and gabbros, camptonites and monzosyenites, display respective similar mineralogy. Monchiquites contain carbonate ocelli. The trachyte does not contain ferromagnesian minerals. For gabbros and monchiquites, equilibrium Fe-Ti oxide temperatures are between 650 and 750 degrees C (+ or -40 degrees C) and oxygen fugacities between 10 (super -15) and 10 (super -14) (+ or -0.5 X 10 (super -15) ) atmospheres, according to Spencer and Lindsley [1981]. Nepheline crystallized below 700 degrees C, according to Hamilton [1961]. All the rocks (except the trachyte) are nepheline normative (Ne 6 to Ne 40 ). Major and trace element distributions in MgO-element diagrams for the two series merge together into a single trend, from monchiquites to nepheline syenites. Nevertheless, the monchiquites trends have different slopes. We deduce the evolution from gabbros to nepheline syenites on the one hand and from monchiquites to camptonites on the other from primitive mantle normalized multi-element diagrams. Multi-element diagrams for the trachyte and the nepheline syenite are strictly similar. Patterns for Kokoumi gabbros are similar to those for basalts of the Kapsiki plateau [Ngounouno et al., 2000] and the Garoua rift [Ngounouno et al., 1997] with typical negative K and positive Zr and Ti anomalies. Patterns for nepheline monzosyenites display negative anomalies in Sr, P, Eu and Ti and those for nepheline syenites and trachyte display greater anomalies in these elements and Ba. Compared to gabbros, nepheline monzosyenites are enriched in all REE with a concave upward pattern and no Eu-anomaly. Nepheline syenites have a range of broadly similar REE patterns to nepheline monzosyenites with steep slope from La to Sm, strong Eu negative anomaly (Eu/Eu (super *) nearly equal 0.15) and heavy-REE spoon-shape. REE patterns for monchiquites, camptonites, and trachyte are respectively similar to those for gabbros, monzosyenites, and nepheline syenite. Initial Sr-isotope ratios of 0.7033 (recalculated from the measured ratios for an age of 39 Ma for plutonic rocks and 20 Ma for the lamprophyres and the trachyte) are similar to those obtained for basalts from the continental segment of the Cameroon Line [Halliday et al., 1988; Ngounouno et al., 2000; Demaiffe et al., unpubl.], whereas nepheline syenites and trachyte are distinctly more radiogenic with values between 0.7128 and 0.7251. Amphibole and whole-rock K-Ar analyses (table III) yield 39.0+ or -0.9 Ma and 36.6+ or -0.9 Ma respectively. Since amphibole is a reliable chronometer in K-Ar dating, we propose the first age as the probable time of emplacement of the gabbros. Whole-rock analysis of nepheline syenite 99 displays an age of 33.1+ or -0.5 Ma. Field and geochemical observations suggest that gabbros and nepheline syenite are cogenetic and hence contemporaneous.

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Pernklau, E. "Mineralogie; Eine einführung in die spezielle mineralogie, petrologie und lagerstättenkunde." Earth-Science Reviews 23, no. 1 (February 1986): 65–66. http://dx.doi.org/10.1016/0012-8252(86)90005-x.

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Wiegand, Jens. "Petrology and Geochemistry of the granites of the Neunburg-Thanstein massif (Oberpfalz)." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 197, no. 1 (July 14, 1995): 1–35. http://dx.doi.org/10.1127/njgpa/197/1995/1.

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Hann, Horst Peter. "Tectonics and petrology of the Southern Schwarzwald crystalline massif in the area of the lower Wehratal." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 240, no. 1 (May 10, 2006): 121–51. http://dx.doi.org/10.1127/njgpa/240/2006/121.

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Office, Editorial. "Die Kruidfontein Karbonatietkompleks, Suid-Afrika: geologic, petrologie, geochemie en ekonomiese potensiaal." Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 18, no. 1 (July 12, 1999): 29. http://dx.doi.org/10.4102/satnt.v18i1.715.

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Gerschel, Henny, Norbert Volkmann, and Jochen Rascher. "Bewertung der wirtschaftlichen Nutzbarkeit von Weichbraunkohle durch Kohlengeologie und Organische Petrologie." Chemie Ingenieur Technik 90, no. 1-2 (November 30, 2017): 226–33. http://dx.doi.org/10.1002/cite.201700078.

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Vitel, G. "Le Granite du Gouffre d'Enfer (Massif Central francais); petrologie d'un marqueur tectonique varisque." Bulletin de la Société Géologique de France IV, no. 6 (November 1, 1988): 907–15. http://dx.doi.org/10.2113/gssgfbull.iv.6.907.

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Corteel, C., and P. De Paepe. "Boron metasomatism in the Brabant Massif (Belgium): Geochemical and petrographical evidence of Devonian tourmalinite pebbles." Netherlands Journal of Geosciences 82, no. 2 (July 2003): 197–208. http://dx.doi.org/10.1017/s0016774600020746.

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AbstractNew petrographical and geochemical evidence of tourmalinite pebbles from two Lower and three Middle Devonian formations from Belgium is presented. Petrography, REE, transition metal and microprobe data of the studied rocks suggest it are (meta)sediment-derived tourmalinites formed by boron metasomatism (and hydrothermal brecciation) in an intrusive setting. Tourmaline mineralizations within eastern Avalonia are known in south-east Ireland, the English Lake District and East Anglia. Based on previously suggested relations between Early Palaeozoic igneous activity in last two mentioned regions and the Brabant Massif, it is presumed that the Brabant Massif also underwent granite-related tourmalinization and that this was the source of the studied pebbles. Petrologie differences between pebbles found in Middle Devonian formations and pebbles from Lower Devonian formations, suggest that fluid circulation occurred on a regional scale, possibly extending into the Stavelot massif.

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Στιμάρατζης, Θ., Β. Χρηστάρας, Γ. Δημόπουλος, A. Κίλιας, M. Χατζηαγγέλου, and Ν. Χατζήγώγος. "STUDY OF THE STABILITY CONDITIONS OF A HIGH CUT SLOPE ALONG EGNATIA HIGHWAY (ASPROVALTA - MACEDONIA)." Bulletin of the Geological Society of Greece 36, no. 4 (January 1, 2004): 1833. http://dx.doi.org/10.12681/bgsg.16656.

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This study is about the stability conditions of a high cut slope as well as the possible measures of restoration, along the Egnatia Highway (deviation of Asprovalta). The study includes: the topographic map of the landslide and the 3-D view with the use of Geographical Information Systems, the analysis of geological and petrologie data from the samples of five core drillings, the soil mechanics laboratory tests, the determination of the causes and the landslide mechanisms and finally the slope stability analysis with «classic» methods such as Bishop, Janbu, Morgenstern-Price. A multiple repeated slope stability analysis took place in order to determinate the proper geometry (inclinations) of the slope with new benches. From the analysis of the data, the landslide restoration can be achieved with the combination of measures such as new benches geometry (proposed), surface drainage systems, retaining walls, soil nailing, geogrids and grass mat.

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de Mulder, Mark. "De Karisimbi, Een Recente Vulkaan van Het Virungagebied (Rwanda, Zaire)." Afrika Focus 2, no. 1 (January 12, 1986): 23–54. http://dx.doi.org/10.1163/2031356x-00201003.

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Karisimbi, A Recent Volcano of the Virunga Area (Rwanda, Zaire) This paper deals with the geological structure and the petrologic evolution of Karisimbi, the highest volcano in the Virunga region. As this paper is intended to be understood by non-geologists, a brief review about the methods used by volcanologists, should make things clear for the reader. The field-work data enabled us to describe the morphology, structure and the evolution of Karisimbi. The results of the laboratory studies are summarized in the section petrography – petrochemistry, where some problems concerning nomenclature and interpretation of chemical data are discussed as well. Petrographical and petrochemical information leads us to the origin and the evolution of magmas, which is the ultimate purpose of every petrologist. In the case of Karisimbi, it is suggested that its petrologic evolution took place by simultaneous fractional crystallization and contamination by crustal rocks. Finally, the ages of some typical Karisimbi lavas have been determined by a radiometric dating method (K-Ar), bearing in mind that large errors on these ages are inevitable.

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Michel-Lévy, Mireille Christophe, and Michèle Bourot-Denise. "A New Look at the Galim (a) and Galim (b) Meteorites." Mineralogical Magazine 52, no. 367 (September 1988): 519–25. http://dx.doi.org/10.1180/minmag.1988.052.367.12.

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AbstractSmall stones were recovered from a meteorite shower observed in Cameroon on November 13, 1952. The majority are LL6 specimens, Galim (a), but one is a chondrule-rich enstatite chondrite, Galim (b). Petrology and mineral chemistry were determined on polished sections of both types. Galim (a) has undergone multiple brecciation. During the first, chromite apparently recrystallized in healed fractures under more reducing conditions than those which prevailed when the silicates recrystallized. Galim (b) shows some features of petrologic type 3 but differs considerably from the other unequilibrated E chondrites. It is suggested that Galim (a) and Galim (b) belong to the same meteorite shower.

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Martinez, Luis, and Jacques Connan. "Approche de la migration primaire des hydrocarbures par des etudes integrees de geochimie et de petrologie organique sur roches meres chaffees in vitro." Bulletin de la Société Géologique de France V, no. 5 (September 1, 1989): 937–50. http://dx.doi.org/10.2113/gssgfbull.v.5.937.

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Bossiere, G. "Petrologie d'un granite genetiquement lie au fonctionnement d'une zone blastomylonitique de haute pression; le granite de Sidi Ali bou Nab (Grande Kabylie, Algerie)." Bulletin de la Société Géologique de France I, no. 2 (March 1, 1985): 239–47. http://dx.doi.org/10.2113/gssgfbull.i.2.239.

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Ruda, Natalia. "WORD-FORMING TYPES OF ROCKS AND MINERALS NAMES IN UKRAINIAN PETROLOGY." Bulletin of Taras Shevchenko National University of Kyiv. Literary Studies. Linguistics. Folklore Studies, no. 31 (2022): 66–69. http://dx.doi.org/10.17721/1728-2659.2022.31.13.

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Dynamic development of petrology leads to the intensification of the processes of terms formation. The need to organize the system of rocks and minerals names in the Ukrainian language in accordance with international standards, to unify and to standardize it is becoming increasingly important. A number of problems related to the functioning and development of Ukrainian (and international) petrological terminology, including the transcription of international names in the national language, constant changes in spelling, the existence of doublet terminological elements, synonymy of terms, etc. require the attention of not only naturalists but also linguists. The article considers the issues of petrological terms formation in the Ukrainian language. Attention is focused on the description and analysis of the main word-forming types of rocks and minerals names. The main problems of rocks and minerals names formation in modern Ukrainian petrology are highlighted. It was found that in modern petrology occurs an extremely branched paradigm of means, types and models of rocks and minerals names formation, which, on the one hand, helps to create the most appropriate name, but on the other hand, causes the emergence of large number of synonyms. It is determined that the terminological derivation in Ukrainian petrology, as well as in international, is based on terminological elements of Greek-Latin origin, to use them properly petrologist needs to know ancient Greek and Latin. The most productive were proved to be suffixal word-forming types; the main prefixal and compositional types were also analyzed. Despite the high productivity of suffixal types, the largest number of irrational, scientifically uninformative names is created through the use of suffixes, while prefixation and composition prevail in the word formation of rational nomenclature.

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Powolny, Tomasz, and Magdalena Dumańska-Słowik. "Review of existing systems of jaspers nomenclature and classification in Poland and worldwide." Gospodarka Surowcami Mineralnymi 33, no. 2 (June 27, 2017): 43–52. http://dx.doi.org/10.1515/gospo-2017-0011.

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Abstract Nowadays, the term “jasper” is variably defined in petrology and gemology. The unification of the nomenclature and the classification of jaspers seems to be an essential challenge for petrologists worldwide. This misnomer is very commonly used among sellers or collectors of various gemstones. Therefore, a huge diversity in the mineralogical composition, geological settings and genesis of particular “spotted stones” is reported. In this paper the term “jasper” is proposed for all “spotted stones” which have technical properties that make them useful for jewelry and in the production of small stone accessories. Nevertheless, the introduction and approval of the term “true jasper” for rocks of hydrothermal- metasomatic origin and metamorphosed volcanogenic-sedimentary products to petrologic nomenclature is recommended. Different types of jaspers and related rocks have various economic significance. Jaspers or jasper-like rocks are decorative gemstones applied in jewelry, whereas others may be used as refractory materials or feldspar raw materials. In contrast, the petrographic research of jasperoids is useful during prospecting new ore deposits.

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Halama, Ralf. "Eclogites." Geology Today 40, no. 1 (January 2024): 33–40. http://dx.doi.org/10.1111/gto.12462.

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The beauty of an eclogite is something to behold: any petrologist marvels in the combination of red garnet and green omphacite that are the main mineral constituents of the rock. But besides their stunning appearance, there is much more to eclogites: fundamental concepts in metamorphic petrology and geodynamics were developed based on scientific investigations of eclogites. It is well established that they derive from precursor rocks of basaltic composition and form under high‐pressure conditions at more than c. 45 km depth, but other aspects of their occurrences and geological significance remain debated. The relative scarcity of eclogites among crustal rocks renders them largely unknown to the layperson, so following the 200th anniversary of the term eclogite in 2022, there is an opportunity to take a closer look at this fascinating rock.

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Resimic-Saric, Kristina, Vladica Cvetkovic, and Kadosa Balogh. "Radiometric K/ag data as evidence of the geodynamic evolution of the Zdraljica ophiolitic complex, central Serbia." Annales g?ologiques de la Peninsule balkanique, no. 66 (2005): 73–79. http://dx.doi.org/10.2298/gabp0566073r.

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The study presents age data and petrologic characteristics of igneous rocks of the Zdraljica ophiolitic complex (ZOC), situated in central Serbia, 150 km south of Belgrade. The complex consists predominately of a MORB/VAB-like tholeutic suite, represented mostly by gabbros and diabases. The tholeiitic suite is intruded by calc-alkaline intermediate and acid magmas of a VA-affinity, which presumably formed in a pre-collisional setting. The whole complex is intruded by peraluminous granite magmas. The crystallization age of the calc-alkaline pre-collisional quartzdiorite is 168.4?6.7 Ma and it post-dates the formation of the here exposed ocean?ic crust. Geological evidence suggest that the emplacement of the complex occurred during the Upper Jurassic. With respect to their petrology and age, the Zdraljica ophiolitic rocks are similar to the south Apuseni Mts. ophiolites, situated to the north, and to the Kursumija and Guevgeli ophiolites, situated to the south. All these ophiolites probably formed as parts of a single Jurassic belt, which can be termed the eastern branch of the Vardar Zone.

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Bohatý, Martin, Dalibor Velebil, and František Vacek. "Emanuel Bořický – petrograf, mineralog a kustod Musea království Českého." Journal of the National Museum (Prague), Natural History Series 192, no. 1 (2023): 43–90. http://dx.doi.org/10.37520/jnmpnhs.2023.004.

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Emanuel Bořický (*11 December 1840 Milín, †27 January 1881 Prague) was a prominent Czech petrologist and mineralogist, professor at Charles University in Prague and custodian of the mineralogical collections of the National Museum in Prague. Ha was the first in Bohemia who systematically used a petrological microscope in his work. He was the first in the world to introduce the methods of microchemistry into petrology. He published about 100 scientific articles, short communications and monographs. As a mineralogist, he mainly devoted his career to chemical analyzes of minerals. He recognized then new minerals as zepharovichite (today wavellite), uranotile (today uranophane), přílepite (fossil resin) and parankerite (Fe-dolomite). In 1868, James Dwight Dana named the mineral borickite (bořickýite, now delvauxite) in his honor. He published four extensive studies: on Czech basalts (1873), phonolites (1874), melaphyres (1876) and porphyrites (1881). He published his method of microchemical determination of rock-forming minerals in 1877.

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ΛΕΙΒΑΔΊΤΗΣ, Γ., and Α. ΑΛΕΞΟΥΛΗ-ΛΕΙΒΑΔΙΤΗ. "Geomorphology of the island of Tinos." Bulletin of the Geological Society of Greece 34, no. 1 (January 1, 2001): 389. http://dx.doi.org/10.12681/bgsg.17041.

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Morphology of Tinos Island is controlled mainly by lithology and tectonics. A significant factor is also the climate; the very high humidity and the strong winds of NNE directions. These special climate characteristics cause intense chemical alteration and cellular weathering at schists and granodiorites. The relief is fairly mountainous. Mt. Tsiknias in the south is the highest mountain (725m). In the central part of the island there are Mesovouni (647m) and Prasa (614m). The slopes of the valley-sides vary a lot depending mainly on the original dip. The relief is smooth while slopes of 15-45% comprise 73% of the island. Three morphological units with different relief type can be distinguished, that results from lithological differences and the type of erosion. The first unit covers the larger part of the island and consists of mica-schists with marble intercalation. The second unit is observed at the mountains Tsiknias, Vouno and Marias. It consists of green schist, clorittalkschists. It is characterized generally of smooth relief with acute notched peaks and Tafoni. The third unit comprises the area of the plutonic rocks. It is characterized by dispersed rounded bulks of granite and spheroidal weathering. Petrologie examination showed biotitic-monzogranit in the area Steni-Volax and biotitic-granodiorit in Livada. In the spherical bulks of Livada Tafoni are created. The spheroidal weathering is owed to chemical processes. The weathered mantle was identified sericitization. The island is crossed by a watershed, which is parallel to the long axis of the island trending NW-SE, and separates the island in two asymmetric parts. The watershed is coincided to the axis of the folds. Pianation surfaces are observed at 100m, 200m, 300- 350m, 410-430m and at 600m. The topographic slopes along the coasts of Tinos present a wide range of values. The slopes of the coasts of the 500m cross-sectional coastal zone, are higher of those of the 1000m one. Clear relation between the slopes of these zones and the corresponding lithologie formations is not observed. It is believed that the main factors which controls the slope morphology of the coastal zone is the tectonic and the weathering.

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NAUMANN, T. "Petrology and Geochemistry of Volcan Cerro Azul: Petrologic Diversity among the Western Galapagos Volcanoes." Journal of Petrology 43, no. 5 (May 1, 2002): 859–83. http://dx.doi.org/10.1093/petrology/43.5.859.

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Santos, Alison R., Carl B. Agee, Francis M. McCubbin, Charles K. Shearer, Paul V. Burger, Romain Tartèse, and Mahesh Anand. "Petrology of igneous clasts in Northwest Africa 7034: Implications for the petrologic diversity of the martian crust." Geochimica et Cosmochimica Acta 157 (May 2015): 56–85. http://dx.doi.org/10.1016/j.gca.2015.02.023.

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Aléon, Jérôme, Alice Aléon-Toppani, Bernard Platevoet, Jacques-Marie Bardintzeff, Kevin D. McKeegan, and François Brisset. "Alkali magmatism on a carbonaceous chondrite planetesimal." Proceedings of the National Academy of Sciences 117, no. 15 (March 30, 2020): 8353–59. http://dx.doi.org/10.1073/pnas.1919550117.

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Recent isotopic and paleomagnetic data point to a possible connection between carbonaceous chondrites and differentiated planetary materials, suggesting the existence, perhaps ephemeral, of transitional objects with a layered structure whereby a metal-rich core is enclosed by a silicate mantle, which is itself overlain by a crust containing an outermost layer of primitive solar nebula materials. This idea has not received broad support, mostly because of a lack of samples in the meteoritic record that document incipient melting at the onset of planetary differentiation. Here, we report the discovery and the petrologic–isotopic characterization of UH154-11, a ferroan trachybasalt fragment enclosed in a Renazzo-type carbonaceous chondrite (CR). Its chemical and oxygen isotopic compositions are consistent with very-low-degree partial melting of a Vigarano-type carbonaceous chondrite (CV) from the oxidized subgroup at a depth where fluid-assisted metamorphism enhanced the Na content. Its microdoleritic texture indicates crystallization at an increasing cooling rate, such as would occur during magma ascent through a chondritic crust. This represents direct evidence of magmatic activity in a carbonaceous asteroid on the verge of differentiating and demonstrates that some primitive outer Solar System objects related to icy asteroids and comets underwent a phase of magmatic activity early in the Solar System. With its peculiar petrology, UH154-11 can be considered the long-sought first melt produced during partial differentiation of a carbonaceous chondritic planetary body, bridging a previously persistent gap in differentiation processes from icy cometary bodies to fully melted iron meteorites with isotopic affinities to carbonaceous chondrites.

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Hughes, Alexandra T., Brian D. Smerdon, and Daniel S. Alessi. "Hydraulic properties of the Paskapoo Formation in west-central Alberta." Canadian Journal of Earth Sciences 54, no. 8 (August 2017): 883–92. http://dx.doi.org/10.1139/cjes-2016-0164.

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In an effort to better understand the hydraulic properties of the Paskapoo Formation, hydraulic conductivity and porosity were evaluated for a region in west-central Alberta. Whereas previous studies have focused mainly on sandstone units in the lower portion of the Paskapoo Formation, in southern and central parts of the province, this study focuses on the middle to upper portions. Hydraulic conductivity values were determined by air permeametry for seven drill cores from the area between Hinton and Fox Creek, Alberta. Thin-section petrology and porosity analyses using photomicrographs were also conducted for three of the seven drill cores. Results confirm previous findings that the Paskapoo Formation has heterogeneous hydraulic properties, with horizontal hydraulic conductivity values ranging from 10−10 to 10−5 m/s (determined by air permeametry) and porosity values ranging from 0.02% to 15.3%. The first measurements for the upper sandstone units are provided (1.1 × 10−9 – 2.6 × 10−5 m/s and 0.08%–15.3%) and numerous measurements of the middle siltstone–mudstone unit (1.1 × 10−10 – 4.9 × 10−8 m/s and 0.02%–1.8%) for the northwestern portion of the Paskapoo Formation. Qualitative petrologic analysis suggests that the degree of cementation, rather than grain size, is the dominant control on the hydraulic properties of this portion of the formation. This study determined primary hydraulic properties for both the highly conductive units often considered as aquifers and the low-conductivity units considered as aquitards or confining layers. When combined with previous findings, this study helps expand the understanding of the Paskapoo Formation and provides critical data for assessing groundwater resources.

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Ehrenberg, S. N., J. E. Neilson, E. Gomez‐Rivas, N. H. Oxtoby, I. S. A. J. Jayachandran, Q. Adlan, and V. C. Vahrenkamp. "STRATIGRAPHY AND DIAGENESIS OF THE THAMAMA‐B RESERVOIR ZONE AND ITS SURROUNDING DENSE ZONES IN ABU DHABI OILFIELDS AND EQUIVALENT OMAN OUTCROPS." Journal of Petroleum Geology 47, no. 4 (September 23, 2024): 395–430. http://dx.doi.org/10.1111/jpg.12871.

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We review published studies characterizing the Thamama‐B reservoir zone in the upper Kharaib Formation (late Barremian) in Abu Dhabi oilfields and at outcrops in Oman. Available data for oxygen and carbon isotope compositions, fluid inclusion measurements, cement abundance and formation water composition are interpreted in terms of a paragenetic model for the Thamama‐B in field F in Abu Dhabi where the interval is deeply buried. The present synthesis provides a useful basis for understanding and predicting reservoir quality in static models and undrilled prospects, as well as for planning promising directions for further research. The goals of this study were to summarize the geologic setting and petrology of the Thamama‐B reservoir and its surrounding dense zones, and to examine how sedimentology, stratigraphy and diagenesis have interacted to control porosity and permeability. Results that may have useful applications for similar microporous limestone reservoirs in general include: the depositional environments and stratigraphy of the subject strata; a model for how porosity variations result mainly from calcite cementation sourced from stylolites, with little dependence on lithofacies other than the localization of chemical compaction by depositional clay linked to sequence stratigraphy; the use of solidity (rock thickness with porosity removed) as a check on porosity creation by burial dissolution; observations linking high‐permeability streaks with storm lag beds and fractures; the concept of strata being gradually buried through a relatively static salinity‐stratified water column; integration of conventional and clumped stable‐isotope data with petrologic observations to constrain the timing of porosity evolution.

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Adrian, Fahri, Ariadi Putra, Akmal Muhni, and Marwan Marwan. "Depositional Environment Analysis Carbonate Rocks in Montasik District." Journal of Aceh Physics Society 9, no. 3 (September 1, 2020): 72–77. http://dx.doi.org/10.24815/jacps.v9i3.17028.

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Kecamatan Montasik terdiri dari 2 formasi yaitu Formasi Gunungapi Lam Teuba berumur Pliosen Akhir sampai Plistosen Akhir dan Formasi Anggota Padangtiji berumur Pliosen Awal sampai Pliosen Tengah. Litologi Formasi Anggota Padangtiji terdiri dari konglomerat, batulanau, batupasir gampingan dan batu gamping. Lingkup penelitian ini meliputi kajian tentang kondisi geologi permukaan dan analisis lingkungan pengendapan sedimen karbonat pada lokasi penelitian. Metode yang digunakan dalam penelitian ini yaitu pengambilan data langsung di lapangan dan menganalisis petrologi dan petrografi pada sampel batuan. Litologi pada lokasi penelitian terdiri dari 7 satuan yaitu guguran lava, lava andesit, lapili jatuhan piroklastik, tuf jatuhan piroklastik, konglomerat, batugamping terumbu dan batupasir gampingan. Lingkungan pengendapan sedimen karbonat yang terdapat pada lokasi penelitian terbentuk di laut dangkal (reef) pada kedalaman 0 m - 200 m di bawah permukaan laut. Zona fasies pengendapan batugamping pada lokasi penelitian terendapkan pada zona platform margin sands dan organic buildups. Sedangkan zona fasies terumbu pada lokasi penelitian terdapat pada zona reef front. Montasik district consists of two formations, Gunungapi Lam Teuba Formation aged Late Pliocene – Late Pleistocene and Padangtiji Member aged Early Pliocene – Middle Pliocene. Lithology of Padangtiji Member consists of conglomerate, siltstone, carbonate sandstone, and limestone. The scope of this research includes a study of surface geological conditions and depositional environmental analysis of carbonate sediment. The method used in this study is direct data collection in the field and analyzing petrology and petrography in rock samples. Lithology of the research area consists of lava drop, andesit, lapili pyroclastic, tuff pyroclastic, conglomerate, fosilliferous limestone, and carbonate sandstone. Depositional environment in the research area formed at shallow marine (reef) on 0m-200m depth under sea level. Depositional facies zone in the research area is on the margin sands platform zone and organic buildups, while Reef facies zone contained in reef front zone.Keywords: Geological Mapping, Depositional Environment, Carbonate Rocks, Petrography, Montasik

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Peacock, Simon M. "Advances in the thermal and petrologic modeling of subduction zones." Geosphere 16, no. 4 (June 5, 2020): 936–52. http://dx.doi.org/10.1130/ges02213.1.

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Abstract In the two decades since Subduction: Top to Bottom was published in 1996, improved analytical and numerical thermal-petrologic models of subduction zones have been constructed and evaluated against new seismological and geological observations. Advances in thermal modeling include a range of new approaches to incorporating shear (frictional, viscous) heating along the subduction interface and to simulating induced flow in the mantle wedge. Forearc heat-flux measurements constrain the apparent coefficient of friction (μ′) along the plate interface to <∼0.1, but the extent to which μ′ may vary between subduction zones remains challenging to discern owing to scatter in the heat-flux measurements and uncertainties in the magnitude and distribution of radiogenic heat production in the overriding crust. Flow in the mantle wedge and the resulting thermal structure depend on the rheology of variably hydrated mantle rocks and the depth at which the subducting slab becomes coupled to the overlying mantle wedge. Advances in petrologic modeling include the incorporation of sophisticated thermodynamic software packages into thermal models and the prediction of seismic velocities from mineralogic and petrologic models. Current thermal-petrologic models show very good agreement between the predicted location of metamorphic dehydration reactions and observed intermediate-depth earthquakes, and between the predicted location of the basalt-to-eclogite transition in subducting oceanic crust and observed landward-dipping, low-seismic-velocity layers. Exhumed high-pressure, low-temperature metamorphic rocks provide insight into subduction-zone temperatures, but important thermal parameters (e.g., convergence rate) are not well constrained, and metamorphic rocks exposed at the surface today may reflect relatively warm conditions in the past associated with subduction initiation or ridge subduction. We can anticipate additional advances in our understanding of subduction zones as a result of further testing of model predictions against geologic and geophysical observations, and of evaluating the importance of advective processes, such as diapirism and subduction-channel flow, that are not captured in hybrid kinematic-dynamic models of subduction zones but are observed in fully dynamical models under certain conditions.

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Kretz, Ralph. "Petrology." Earth-Science Reviews 30, no. 3-4 (June 1991): 328–29. http://dx.doi.org/10.1016/0012-8252(91)90008-4.

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Irawan, Januar Fery, Sapna Rizqi Febriany, Ade Reza Saputra, and Sultan Affith Faizal. "Studi Karakteristik Geologi Gumuk di Kecamatan Sumbersari Kabupaten Jember Jawa Timur Ditinjau dari Analisis Petrologi." Jurnal Teknologi Sumberdaya Mineral (JENERAL) 2, no. 2 (December 21, 2021): 60. http://dx.doi.org/10.19184/jeneral.v2i2.28502.

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Gumuk di kabupaten Jember khususnya di kecamatan Sumbersari merupakan morfologi yang unik yang sering dikaitkan dengan fungsi sebagai resapan air. Sementara itu, pemanfaatan Gumuk di kecamatan Sumbersari seringkali digunakan untuk sumber bahan galian. Apabila komposisi batuan penyusun gumuk memiliki porositas dan permeabiiitas yang baik, maka morfologi gumuk memiliki fungsi sebagai tempat resapan air. Disamping itu terjadinya gumuk dikarenakan oleh proses geologi yang unik yang muncul di morfologi bergelombang. Oleh karena itu diperlukan penelitian untuk mengetahuI karakteristik morfologi gumuk. Metode penelitian ini dilakukan dengan menggunakan analisis mineralogi dan petrologi. Analisis ini dilakukan dengan cara mengambil sampel batuan penyusun gumuk di kecamatan sumbersari. Dari hasil analisis petrologi menunjukkan bahwa batuan penyusun gumuk merupakan endapan breksi volkanik klastik dengan fragmen andesit berwarna abu abu cerah dengan matriks terdiri dari mineral lempung dan pasir halus yang berwarna coklat cerah.

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Yuniarni, Rum. "Ciri Petrologi dan Geokimia Batuan Terobosan Gunung Sepikul, Trenggalek, Jawa Timur." Jurnal Geologi dan Sumberdaya Mineral 25, no. 2 (May 21, 2024): 107–16. http://dx.doi.org/10.33332/jgsm.geologi.v25i2.742.

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Gunung Sepikul di bagian selatan Jawa Timur berkaitan dengan proses magmatisme yang berumur Miosen. Maksud penelitian ini untuk mengetahui karakteristik petrologi dan geokimia batuan beku Gunung Sepikul. Tujuannya mengungkapkan gambaran tektonik dan melengkapi data petrologi lajur magmatisme Jawa bagian selatan. Singkapannya berupa stock terdiri atas diorit dan granodiorit. Percontoh batuan dianalisis menggunakan metode petrografi, XRF dan ICP-MS. Data lapangan dan hasil analisa laboratorium berupa komposisi mineral serta geokimia batuan dapat menunjukkan proses magmatisme batuan Gunung Sepikul. Batuan diorit berwarna kelabu, tekstur inequigranular terdiri atas mineral plagioklas, kuarsa, piroksen, hornblenda dan mineral opak. Batuan granodiorit berwarna kelabu cerah, tekstur porfiritik dengan fenokris plagioklas, hornblenda, kuarsa dan mineral opak pada masadasar feldspar dan kuarsa. Berdasarkan analisa geokimia, batuan terobosan ini berafinitas magma Medium-low K series yang berhubungan dengan magmatisme di lingkungan tektonik orogenic. Kata Kunci: terobosan, stock, diorit, granodiorit, magmatisme

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Draniswari, Windi Anarta, Sekar Indah Tri Kusuma, Tyto Baskara Adimedha, and I. Gde Sukadana. "Peran Kontaminasi Kerak pada Diferensiasi Magma Pembentuk Batuan Vulkanik Sungai Ampalas, Mamuju, Sulawesi Barat." EKSPLORIUM 41, no. 2 (November 30, 2020): 73. http://dx.doi.org/10.17146/eksplorium.2020.41.2.6040.

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ABSTRAK Anomali radiometri telah ditemukan di area Sungai Amplas pada bongkah batuan vulkanik. Nilai yang terukur dari spektrometer gama adalah 787 ppm eU dan 223 ppm eTh. Penemuan ini menarik untuk pengembangan eksplorasi. Studi lebih lanjut diperlukan untuk mengetahui karekteristik batuan pembawa mineral radioaktif dari sampel in-situ. Penelitian ini bertujuan untuk mengetahui karakteristik petrologi dan geokimia batuan vulkanik Ampalas sebagai studi awal untuk mengetahui proses akumulasi mineral radioaktif pada batuan vulkanik Ampalas. Metodologi yang digunakan meliputi pengamatan lapangan, pengambilan sampel batuan, analisis petrografi dan X-Ray Fluorescence (XRF). Batuan vulkanik ampalas tersusun atas ponolit, foidit, dan foid-syenit. Tekstur batuannya terdiri dari porfiritik, aliran, rim piroksen, zoning, pseudo-leusit, korosi, inklusi mafik, dan sieve. Karakteristik geokimia menunjukkan alkalinitas tinggi dan indikasi pengayaan mineral radioaktif yang tersebar dalam batuan. Proses magmatis yang berperan dalam pembentukan batuan vulkanik adalah fraksionasi kristal (fraksionasi leusit dan alkali felspar), asimilasi kerak kontinen, dan pencampuran magma. Interaksi antara magma dan kerak menyebabkan diferensiasi magma berkelanjutan yang menghasilkan akumulasi uranium dan torium lebih tinggi.ABSTRACT Anomalous radiometry has been found in Ampalas River Area on volcanic rock boulder. The values measured from gamma spectrometer are 787 ppm eU and 223 ppm eTh. This discovery is promising for exploration development. Further study need to figure the radioactive mineral bearing rock characteristic from in-situ samples. The research aim is to determine the petrology and geochemical characteristics of Ampalas volcanic rocks as preliminary study to find radioactive mineral accumulation process of Ampalas volcanic rocks. The methodologies are field observation, rock sampling, petrography, and X-Ray fluorescence (XRF) analyses. The Ampalas volcanic rocks consist of phonolite, phoidite, and phoid syenite. Their textures are porphyritic, flow, pyroxene rim, zoning, pseudo-leucite, corrosion, mafic inclusions, and sieve. The geochemical characteristics show high alkalinity and radioactive mineral enrichment disseminating on rock. The magmatic processes which play a significant role in radioactive mineral-bearing rocks formation are crystal fractionations (leucite and alkaline feldspar fractionations), continental crust assimilation, and magma mixing. Long interaction between magma and crust creates advanced magma differentiation causing higher uranium and thorium accumulation.

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Fadhlurrohman Putrananda, Aditya, Mega Fatimah Rosana, and Euis Tintint Yuningsih. "Asosiasi Skandium dan Potensi Keberadaan Unsur Tanah Jarang pada Profil Laterit Nikel pada Daerah Wasile, Halmahera Timur, Maluku Utara." Jurnal Geologi dan Sumberdaya Mineral 25, no. 4 (November 26, 2024): 235–47. http://dx.doi.org/10.33332/jgsm.geologi.v25i4.792.

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Abstrak-Skandium dan Unsur Tanah Jarang merupakan sumber daya strategis yang berharga untuk berbagai aplikasi industri sehingga menjadi perhatian untuk eksplorasi sumber daya, ekstraksi berkelanjutan, dan aplikasi pada pengembangan teknologi. Penelitian ini bertujuan untuk mengetahui karakteristik profil laterit beserta kandungan unsur skandium dan potensi UTJ yang berkembang pada profil laterit nikel yang memiliki batuan dasar ultrabasa. Daerah penelitian berada pada Daerah Wasile, Halmahera Timur. Dalam penelitian ini, metode yang digunakan adalah analisis petrologi dan analisis geokimia,yaitu XRF, ICP-MS dan XRD. Hasil dari analisis petrologi menunjukkan bahwa profil laterit terdiri atas lapisan limonit, zona transisi, saprolit dan batuan dasar. Batuan dasar yang teramati merupakan jenis lerzolite dan serpentinit. Hasil analisis geokimia menunjukkan peningkatan komposisi unsur skandium dan UTJ pada zona saprolit. Kehadiran unsur-unsur ini menjadi potensi untuk korelasi terkait dengan genesis UTJ Ion Adsorption Type dan klasifikasi deposit lebih lanjut. Katakunci: Halmahera, profil laterit, skandium, UTJ.

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34

Gengo, Rafaela Machado, Caio Arthur Santos, Renato Moraes, and Gergely Andres Julio Szabó. "O uso de pseudosseções em Petrologia Metamórfica: conceitos básicos e aplicações, com ênfase em pelitos." Geologia USP. Série Científica 22, no. 1 (February 24, 2022): 21–38. http://dx.doi.org/10.11606/issn.2316-9095.v22-186131.

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O uso de pseudosseções em trabalhos voltados para Petrologia Metamórfica tem se tornado cada vez mais comum nos últimos 20 anos em razão de uma série de fatores, entre eles o avanço das técnicas de análise química mineral usando microssonda eletrônica e laser ablation acoplado à ICP-MS, além do refinamento no tratamento dos dados isotópicos em fases acessórias, tais como monazita e zircão, e, principalmente, o aperfeiçoamento dos softwares disponíveis para a sua construção. A cada ano são lançadas novas atualizações desses softwares; no entanto, bibliografias básicas que contemplem os aspectos teórico-práticos sobre as pseudosseções são escassas, sobretudo em língua portuguesa. Esta contribuição visou sintetizar esses aspectos, que são necessários para aqueles que desejam se aprofundar em Petrologia Metamórfica. Aqui são apresentados alguns princípios básicos de diagramas de fase, no geral, e pseudosseções, em particular, e são discutidos os primeiros passos de sua construção. Também são tratados aspectos topológicos de pseudosseções em diferentes sistemas químicos, para exemplificar as diferenças e as semelhanças que ocorrem.

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Gouanvic, Yves, and Claude Gagny. "Reflection sur l'utilisation des experimentations pour la comprehension de la genese des aplo-pegmatites litees (cas de Santa Comba); reply." Bulletin de la Société Géologique de France I, no. 2 (March 1, 1985): 273–76. http://dx.doi.org/10.2113/gssgfbull.i.2.273.

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Abstract M. Pichavant contests the magmatic character of our aplo-pegmatitic layering. Some methodological considerations are expressed; without questionning the usefulness of data from experimental petrology, the greatest care must be taken in their utilizations without the knowledge of geological objects. The arguments of structural petrology [our article, Y. Gouanvic and C. Gagny, 1983] and new analytical data permit us to refute M. Pichavant's argumentation and to maintain our magmatic hypothesis.

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Li, Hui. "Petrology’s Role in Unveiling Geochemical Controls on Soil Contamination: China’s Environmental Assessment (2000-2022)." Innovation in Science and Technology 3, no. 1 (January 2024): 40–50. http://dx.doi.org/10.56397/ist.2024.01.06.

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This review explores the pivotal role of petrology in unraveling geochemical controls on soil contamination, focusing on China’s environmental assessment from 2000 to 2022. Petrology, as a cornerstone of geology, investigates rocks’ mineral composition and origin. In the context of soil contamination, it elucidates the geological factors influencing soil composition, contaminant sources, and their interactions. The paper examines the interconnectedness of petrology and geochemistry, emphasizing their symbiotic relationship in understanding soil contamination. Key sections include an overview of petrological techniques, historical context of soil contamination in China, geochemical patterns in Chinese soils, challenges, and future directions. The findings underscore petrology’s significance, offering insights into environmental policies, sustainable soil management, and recommendations for future research. The synthesis of petrological insights proves indispensable in navigating the complexities of soil contamination, fostering informed decision-making, and ensuring sustainable environmental stewardship.

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Comin-Chiaramonti, Piero, and Marta Silvia Maria Mantovani. "Tópicos especiais de petrologia magmática." Geologia USP. Série Didática 4 (November 25, 2015): 3. http://dx.doi.org/10.11606/issn.2316-9109.v4i0p3-73.

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O desenvolvimento tecnológico das últimas décadas permitiu um grande avanço dos processos analíticos, tanto quanto à variedade como à rapidez na obtenção dos resultados. Instrumentos sofisticados, processos químicos refinados e o uso de computadores possibilitaram quantizar elementos e isótopos concentrados nos minerais de acordo com os processos magmáticos envolvidos. Em 2010, o primeiro autor deste texto ministrou um curso no Instituto de Geociências da Universidade de São Paulo sobre os temas mais recentes de interesse petrológico, complementado por programas de cálculo de interesse específico. O sucesso do curso levou à ideia de reunir as anotações das aulas ministradas e elaboradas pelo autor para colocar tal conteúdo à disposição da comunidade científica. Em vinte tópicos, o texto visa apenas complementar os conhecimentos básicos já adquiridos.

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Rusdi, Infithar Hi, Yayu Indriati Arifin, and Noviar Akase. "Analisis Petrografi Dan Sebaran Litologi Daerah Saripi Dan Sekitarnya, Kecamatan Paguyaman, Kabupaten Boalemo, Provinsi Gorontalo." Geosfera: Jurnal Penelitian Geografi 1, no. 1 (June 30, 2022): 32–39. http://dx.doi.org/10.34312/geojpg.v1i1.15261.

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Lokasi penelitian terletak di Kecamatan Paguyaman, Kabupaten Boalemo, Provinsi Gorontalo. Ditinjau dari fisiografi regional lokasi penelitian termasuk dalam wilayah Pegunungan Selatan Bone-Tilamuta-Modello, sedangkan dari geologi regional terdapat empat formasi batuan di lokasi penelitian yaitu Formasi Diorit Boliohuto, Formasi Tinombo, Formasi Dolokapa, dan Formasi Endapan Danau. Tujuan penelitian ini adalah memetakan jenis dan sebaran litologi yang terdapat di lokasi penelitian berdasarkan analisis petrologi dan petrografi. Metode penelitian dilakukan dengan survei lintasan geologi permukaan berupa pendeskripsian petrologi singkapan batuan serta pengambilan sampel untuk analisis petrografi. Hasil yang diperoleh menunjukkan bahwa di lokasi penelitian terdapat dua jenis litologi yakni batuan beku dan batuan sedimen. Analisis petrografi membagi jenis litologi di lokasi penelitian menjadi lima satuan batuan : 1. Satuan Andesit tersebar seluas 16% luas lokasi penelitian, 2. Satuan Granodiorit yang menguasai 70% luas lokasi penelitian, 3. Satuan Batupasir sebarannya seluas 4% luas lokasi penelitian, 4. Satuan Tuff tersebar seluas 4% luas lokasi penelitian dan 5. Satuan Aluvial yang tersebar seluas 6% dari luas lokasi penelitian.

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Miranda, A. Mouraz. "Alteração experimental de rochas - A contribuição do Instituto Superior Técnico." Geotecnia, no. 48 (October 20, 1986): 03–37. http://dx.doi.org/10.14195/2184-8394_48_1.

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Faz-se uma resenha dos trabalhos de alteração experimental de rochas rotinadas no Laboratório de Mineralogia e Petrologia do I.S.T.: ensaio com extractor de Soxhlet, ensaio de percolação forçada, ensaio de percolação livre em circuito fechado, ensaios de abrasão mecânica e ensaio de fadiga térmica com secagem-molhagem.

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40

Gaetani, G. A. "SOFTWARE:Igneous Petrology." Science 282, no. 5395 (December 4, 1998): 1834–35. http://dx.doi.org/10.1126/science.282.5395.1834.

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Tankard, Anthony J. "Sedimentary Petrology." Sedimentary Geology 152, no. 1-2 (September 2002): 159–60. http://dx.doi.org/10.1016/s0037-0738(01)00254-8.

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Varma, Atul Kumar. "Organic Petrology." Gondwana Research 3, no. 2 (April 2000): 284–86. http://dx.doi.org/10.1016/s1342-937x(05)70115-5.

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Burley, Brian J. "Igneous petrology." Geochimica et Cosmochimica Acta 52, no. 3 (March 1988): 798. http://dx.doi.org/10.1016/0016-7037(88)90345-6.

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Helz, R. T. "Igneous petrology." Journal of Volcanology and Geothermal Research 24, no. 3-4 (May 1985): 361–62. http://dx.doi.org/10.1016/0377-0273(85)90080-0.

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Postma, George. "Sedimentary petrology." Sedimentary Geology 84, no. 1-4 (April 1993): 249. http://dx.doi.org/10.1016/0037-0738(93)90064-c.

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Marsh, B. D. "Enclaves and Granite Petrology. Developments in Petrology, 13." Lithos 29, no. 1-2 (December 1992): 158–59. http://dx.doi.org/10.1016/0024-4937(92)90040-6.

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Ohba, Tsukasa. "Case study and event analysis for mitigation of unpredictable volcanic hazard." Impact 2020, no. 3 (May 13, 2020): 26–28. http://dx.doi.org/10.21820/23987073.2020.3.26.

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Volcanology is an extremely important scientific discipline. Shedding light on how and why volcanoes erupt, how eruptions can be predicted and their impact on humans and the environment is crucial to public safety, economies and businesses. Understanding volcanoes means eruptions can be anticipated and at-risk communities can be forewarned, enabling them to implement mitigation measures. Professor Tsukasa Ohba is a scientist based at the Graduate School of International Resource Studies, Akita University, Japan, and specialises in volcanology and petrology. Ohba and his team are focusing on volcanic phenomena including: phreatic eruptions (a steam-driven eruption driven by the heat from magma interacting with water); lahar (volcanic mudflow); and monogenetic basalt eruptions (which consist of a group of small monogenetic volcanoes, each of which erupts only once). The researchers are working to understand the mechanisms of these phenomena using Petrology. Petrology is one of the traditional methods in volcanology but has not been applied to disastrous eruptions before. The teams research will contribute to volcanic hazard mitigation.

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BATIZA, R., and D. A. VANKO. "Petrologic Evolution of Large Failed Rifts in the Eastern Pacific: Petrology of Volcanic and Plutonic Rocks from the Mathematician Ridge Area and the Guadalupe Trough." Journal of Petrology 26, no. 3 (August 1, 1985): 564–602. http://dx.doi.org/10.1093/petrology/26.3.564.

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He, Lanfang, Ling Chen, Xuben Wang, Zhengjiang Wang, Bing Zhang, Ligui Xu, Xuejun Liu, Weili Li, and Rujun Chen. "Electrical properties and its correlation to the petrology of the Upper Yangtze organic shales." GEOPHYSICS 82, no. 4 (July 1, 2017): D199—D209. http://dx.doi.org/10.1190/geo2016-0203.1.

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Shale gas is a particularly important research target on Chinese energy resources, especially in the Upper Yangtze region. Complex topography and geologic conditions challenge seismic exploration of shale gas in this area, and ground-based electromagnetic (EM) methods are used to aid recognition of the best reservoirs. However, the electrical properties of organic shale (EPOS) and its correlation to shale-gas petrology remain poorly understood. We studied EPOS and their correlation to shale petrology by measuring and analyzing the petrochemical features and complex impedance of rock samples from the Silurian Longmaxi and Cambrian Niutitang Formations in the Upper Yangtze, southwest China. Our study indicates that the organic shale in the Upper Yangtze features low resistivity and high polarizability in terms of a high negative phase, but no obvious low resistivity is observed among shaly sandstone and shales with lower and higher total organic carbon. Pyrite and quartz contents in the organic shale dominantly contribute to the EPOS with different mechanisms. Our result indicates that the EPOS bear relations to the petrology parameters of organic shale, which is essential for shale-gas evaluation and exploration. The correlation between EPOS and the shale-gas petrology promoted a new way for shale-gas exploration with complex geology, topography, and surface conditions in China, especially in the Upper Yangtze region, by using the ground-based EM method to evaluate the parameters of shale gas and to aid to delimit the productive reservoirs (“sweet spots”).

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Tantowi, Abu Amar, Bambang Hidayat, and Andri Slamet Subandrio. "IDENTIFIKASI TEKSTUR UNTUK KLASIFIKASI BATUAN BEKU DENGAN METODE DISCRETE WAVELET TRANSFORM (DWT) DAN SUPPORT VECTOR MACHINE (SVM)." TEKTRIKA - Jurnal Penelitian dan Pengembangan Telekomunikasi, Kendali, Komputer, Elektrik, dan Elektronika 3, no. 2 (August 23, 2019): 37. http://dx.doi.org/10.25124/tektrika.v3i2.2216.

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Petrologi adalah bidang ilmu geologi yang terfokus pada studi mengenai batuan dan kondisi pembentukannya. Petrografi adalah cabang dari petrologi yang menjelaskan deskripsi rinci dari batuan berdasarkan kandungan mineral dan tekstur. Batuan merupakan sekumpulan mineral yang membeku, mineral tersebut umumnya disebut sebagai rock-forming minerals. Dengan mengidentifikasi masing-masing mineral yang terdapat pada batuan dengan bantuan mikroskop, pengklasifikasian dapat dilakukan. Karakteristik dari tiap-tiap jenis batuan tersebut dapat dibedakan dari persentase mineral-mineral yang membentuk batuan tersebut. Mikroskop petrografi dapat menganalisis secara rinci dari mineral dengan mineralogi optik dan sayatan tipis dari batuan. Saat ini, petrografer menggunakan cara konvensional untuk menelitinya dengan menggunakan indera penglihatan. Dalam artikel ini, dilakukan perancangan sebuah perangkat lunak berbasis MATLAB yang dapat mengklasifikasikan jenis-jenis dari batuan. Input dari sistem ini berupa citra digital dari batuan, yang secara mikroskopis diambil dari mikroskop petrografi. Kemudian citra tersebut diolah oleh sistem. Proses pertama adalah pengekstraksian ciri melalui metode Discrete Wavelet Transform (DWT). Selanjutnya dilakukan proses klasifikasi citra melalui metode Support Vector Machine (SVM). Dari hasil pengujian yang dilakukan, didapat akurasi terbaik 83.9506%.

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Journal articles on the topic 'Petrologie'

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