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Articles de revues sur le sujet « Ultramafic rock »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 19 juillet 2025

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1

Jahidin, LO Ngkoimani, LM Iradat Salihin, et al. "Analysis of Ultramafic Rocks Weathering Level in Konawe Regency, Southeast Sulawesi, Indonesia Using the Magnetic Susceptibility Parameter." Journal of Geoscience, Engineering, Environment, and Technology 5, no. 2 (2020): 73–81. http://dx.doi.org/10.25299/jgeet.2020.5.2.4247.

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The Konawe region is part of the Sulawesi Southeast Arm ophiolite belt where ultramafic rocks are exposed in the form of dunite and peridotite. The formation of nickel deposits is closely related to the weathering process of ultramafic rocks as a source rock. Ultramafic rocks exposed to the surface will experience weathering which is influenced by many factors, including in the form of climate change, topography, and existing geological structures. The weathering process in the source rock can influence variations in chemical elements and magnetic properties in laterite soil profiles. Fo

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Guice, George L., Michael R. Ackerson, Robert M. Holder, et al. "Suprasubduction zone ophiolite fragments in the central Appalachian orogen: Evidence for mantle and Moho in the Baltimore Mafic Complex (Maryland, USA)." Geosphere 17, no. 2 (2021): 561–81. http://dx.doi.org/10.1130/ges02289.1.

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Abstract Suprasubduction zone (SSZ) ophiolites of the northern Appalachians (eastern North America) have provided key constraints on the fundamental tectonic processes responsible for the evolution of the Appalachian orogen. The central and southern Appalachians, which extend from southern New York to Alabama (USA), also contain numerous ultramafic-mafic bodies that have been interpreted as ophiolite fragments; however, this interpretation is a matter of debate, with the origin(s) of such occurrences also attributed to layered intrusions. These disparate proposed origins, alongside the range o

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Hasria, Erzam S. Hasan, Deniyatno, L. M. Iradat Salihin, and Asdiwan. "Characteristics of Ultramafic Igneous Rock Ofiolite Complex in Asera District, North Konawe Regency Southeast Sulawesi Province." Journal of Geoscience, Engineering, Environment, and Technology 5, no. 3 (2020): 121–26. http://dx.doi.org/10.25299/jgeet.2020.5.3.4113.

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The research area is located in Asera District, North Konawe Regency, Southeast Sulawesi Province which has ultramafic rock lithology. The purpose of this study is to determine the characteristics of ultramafic igneous rocks using petrographic and geochemical analysis. Petrographic analysis aims to determine the types and abundance of minerals present so that rock types can be determined based on the classification of Travis (1955) and Streckeisen (1976). The geochemical analysis aims to determine the oxide/major element so that it can determine the type of magma based on the AFM classificatio

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Edgar, A. D., L. A. Pizzolato, and G. M. Butler. "Petrology of the ultramafic lamprophyre and associated rocks at Coral Rapids, Abitibi River, Ontario." Canadian Journal of Earth Sciences 31, no. 8 (1994): 1325–34. http://dx.doi.org/10.1139/e94-115.

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An ultramafic lamprophyre sill and dikes, and an olivine–melilite-rich dike rock intrude Lower to Middle Devonian sediments and low- to high-grade Archean metamorphic rocks on the west bank of the Abitibi River, Coral Rapids, Ontario. Although previously considered to be kimberlitic, all these rocks contain olivine + clinopyroxene + phlogopite ± melilite, and hence are ultramafic alkaline rocks. The ultramafic lamprophyre can be distinguished from the dike by its lower SiO2, Na2O, Al2O3, and higher MgO and FeO. In contrast the olivine–melilite dike rock has a more uniform composition, characte

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Taksavasu, Tadsuda. "Petrographic Analysis of Mafic and Ultramafic Rocks in Northern Thailand: Implications for CO2 Mineralization and Enhanced Rock Weathering Approach." Geosciences 15, no. 3 (2025): 89. https://doi.org/10.3390/geosciences15030089.

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Mafic and ultramafic rocks have become a promising approach for atmospheric carbon dioxide (CO2) reduction, as they are major sources of CO2-reactive minerals, i.e., olivine, pyroxene, plagioclase, and serpentine. The minerals potentially sequester CO2 by turning it into a stable solid phase through carbon mineralization in the rock weathering process. However, detailed descriptions and evaluations of the target formations are lacking. This study investigates the mineralogical composition and microtextural characteristics of representative mafic and ultramafic rocks observed in northern Thaila

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ZINCHUK, NIKOLAY. "Specific features of petrographic study of kimberlite." Domestic geology, no. 6 (January 10, 2023): 34–49. http://dx.doi.org/10.47765/0869-7175-2022-10033.

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Based on the analysis of specific actual and analytical material capabilities and perspectives of petrographic and petrological investigations of kimberlite rocks are indicated. Kimberlite is a volcanic igneous rock, undersaturated by silica, enriched in volatiles of peralkaline ultramafic hybrid formations, containing mantle and crust material in varying quantities and ratios. Mantle material in kimberlite is represented by xenoliths of ultramafic, alkali-rich mafic-ultramafic rocks and xeno-minerals from them.

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Hasria, Febiyanti, Masri, et al. "Serpentinization Study On Ultramafic Rock at Morombo Area, Lasolo Islands District, North Konawe Regency, Southeast Sulawesi, Indonesia." Journal of Geoscience, Engineering, Environment, and Technology 7, no. 1 (2022): 15–20. http://dx.doi.org/10.25299/jgeet.2022.7.1.6643.

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The research is in Morombo area, North Konawe Regency, Southeast Sulawesi. The purpose of this study was to determine the characteristics of serpentinized ultramafic rock and serpentine paragenesis. Research was conducted using field observations and laboratory analysis consisting of petrographic and geochemical analysis in the form of X-Ray Fluorosence (XRF). Petrographic analysis was carried out to identify the mineral content and textures in the rock and to determine the percentage of serpentine mineral presence. Both of these rocks are petrographically dominated by primary minerals olivine

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Subba Rao, D. V., and S. M. Naqvi. "Archaean Komatiites from the Older Schist Belt of Kalyadi in Western Dharwar Craton, Karnataka." Journal Geological Society of India 53, no. 3 (1999): 347–54. http://dx.doi.org/10.17491/jgsi/1999/530307.

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Abstract The cluster of enclaves at Kalyadi, Hassan district includes ultramafic-mafic metavolcanic rocks and minor metasedimentary rocks such as chert, cherty quartzite and pelite. Occurrence of pillow and vesicular structures in the ultramafic rocks is being reported for the first time from this area. The average composition of the ultramafic rocks is : SiO2 46.05%, TiO2 0.18%, MgO 31.81%, K2O 0.15%. Cr 3409 ppm and Ni 1610 ppm with a CaO/Al2O3) ratio close tol. The composition, relict igneous structures and metasedimentary rock association are suggestive of a komatiitic affinity for these r

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Erskine, Bradley G. "Geologic Investigations for Compliance with the CARB Asbestos ATCM." Environmental and Engineering Geoscience 26, no. 1 (2020): 99–106. http://dx.doi.org/10.2113/eeg-2290.

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ABSTRACT The California Air Resources Board Airborne Toxic Control Measure for Construction, Grading, Quarrying, and Surface Mining Operations (ATCM) provides requirements for the evaluation for naturally occurring asbestos (NOA) on a construction site. There are two compliance triggers: (1) a determination that the site is located within a geographic ultramafic rock unit, defined as a geographic area designated as an ultramafic rock on referenced maps, and (2) the presence of NOA, serpentinite, or ultramafic rock. The California Geological Survey requires that NOA evaluations be conducted by

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Nayak, Debajyoti, Pranab Das, and Sagar Misra. "Petrology and Geochemistry of Mesoarchean Sukinda Ultramafics, Southern Singhbhum Odisha Craton, India: Implications for Mantle Resources and the Geodynamic Setting." Minerals 13, no. 11 (2023): 1440. http://dx.doi.org/10.3390/min13111440.

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The Sukinda ultramafic complex in India comprises precisely two areas: Kaliapani (KLPN) and Katpal (KTPL). These areas consist of a sequence of lithotypes, including orthopyroxenite, dunite, serpentinite, and chromitite, displaying a rhythmic layering of rocks. These rocks exhibit a cumulate texture and stand out due to their elevated Mg# (78.43–93.20), Cr (905.40–58,799 ppm), Ni (193.81–2790 ppm), Al2O3/TiO2 (27.01–74.06), and Zr/Hf (39.81–55.24) ratios, while possessing lower TiO2 contents (0.01–0.12 wt%). These ultramafics, characterized by low Ti/V (0.83–19.23) and Ti/Sc (7.14–83.72) ratio

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RAJAKARUNA, Nishanta, Kerry KNUDSEN, Alan M. FRYDAY, et al. "Investigation of the importance of rock chemistry for saxicolous lichen communities of the New Idria serpentinite mass, San Benito County, California, USA." Lichenologist 44, no. 5 (2012): 695–714. http://dx.doi.org/10.1017/s0024282912000205.

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AbstractAlthough several lichen inventories exist for European ultramafic sites, only four surveys of serpentine lichens for North America have been published to date. Of those, only one has been conducted in California. We conducted a survey of saxicolous lichens from ultramafic rocks (including nephrite, partially serpentinized peridotite, and serpentinite) and non-ultramafic rocks (including silica-carbonate, shale, and sandstone) at the New Idria serpentinite mass, San Benito County, California. X-ray Fluorescence Analysis of the rocks from which the lichens were collected revealed signifi

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Martins, Vanessa, Douglas Ramos Guelfi Silva, Giuliano Marchi, et al. "EFFECT OF ALTERNATIVE MULTINUTRIENT SOURCES ON SOIL CHEMICAL PROPERTIES." Revista Brasileira de Ciência do Solo 39, no. 1 (2015): 194–204. http://dx.doi.org/10.1590/01000683rbcs20150587.

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The current high price of potassium chloride and the dependence of Brazil on imported materials to supply the domestic demand call for studies evaluating the efficiency of alternative sources of nutrients. The aim of this work was to evaluate the effect of silicate rock powder and a manganese mining by-product, and secondary materials originated from these two materials, on soil chemical properties and on brachiaria production. This greenhouse experiment was conducted in pots with 5 kg of soil (Latossolo Vermelho-Amarelo distrófico - Oxisol). The alternative nutrient sources were: verdete, ver

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Σερέλης, Κ., Ε. Γκάρτζος, and Π. Τσαουσίδου. "STUDY OF THE WALL ROCK ALTERATION OCCURRING IN ULTRAM A F I C ROCKS HOSTING MAGNESITE DEPOSITS, EVIA, GREECE,." Bulletin of the Geological Society of Greece 36, no. 1 (2004): 377. http://dx.doi.org/10.12681/bgsg.16688.

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Three different kinds of alteration processes occur in the studied ultramafic host rocks of the magnesite deposits of N. Evia. In chronological order: Pre-magnesite event (serpentinization), syngenetic brown alteration and weathering. This paper concerns the syngenetic wall rock alteration of the ultramafic host rocks. Two types of wall rock alteration were distinguished. The first one named type (B-i) concerns cases of brown alteration accompanying thin to medium size veins of magnesite. Alteration is restricted in thin (a few cm to 20 cm) vein-parallel bands occurring on both sides of the ve

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Cendrajaya, Rio Irhan Mais, Laode Ihksan Juarsan, Masri, et al. "Petrochemistry of Ultramafic Rock in Baula - Pomalaa Ophiolite Complex, Southeast Sulawesi, Indonesia." Journal of Geoscience, Engineering, Environment, and Technology 9, no. 1 (2024): 44–51. http://dx.doi.org/10.25299/jgeet.2024.9.1.14491.

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Baula and Pomalaa Ophiolitic Complexes are part of East Sulawesi Ophiolite (ESO). The ultramafic rocks in the Baula and Pomalaa Ophiolite Complex mainly is peridotite and consist of harzburgite, lherzolite and olivine websterite, mostly serpentinized. Chemical and petrological research has focused on minerals, such as olivine, pyroxene, and spinel. This study examines the tectonic setting and temperature of ultramafic rock formation. Twelve ultramafic rock samples were examined using geothermometers made of pyroxene, petrographic examination, and coexisting olivine and spinel analyses. SEM and

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Emmanuel Franck Gouedji, Gnamba, Zie Ouattara, Clement Odon N CHO, et al. "PETROGRAPHY AND HYDROTHERMAL ALTERATION OF ULTRAMAFIC BED-ROCKS OF SOUTH SIPILOU: IMPLICATION IN THE LATERITIC NICKEL MINERALIZATION (DEPARTMENT OF SIPILOU, WESTERN IVORY COAST)." International Journal of Advanced Research 10, no. 10 (2022): 1050–61. http://dx.doi.org/10.21474/ijar01/15580.

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South Sipilou is an area containing lateritic nickel mineralization that developed on ultramafic rocks in the department of Sipilou-Biankouma in western Ivory Coast. The objective of this study was to characterize the petrography and hydrothermal alterations affecting these ultramafic bed-rocks and to understand their involvement in lateritic nickel mineralization. Then to compare them to the ultramafic rocks already characterized in the department of Sipilou-Biankouma. Thus, the macroscopic characterization of these rocks was carried out in the field. Then, microscopic observations on the pet

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Burns, Laurel E. "The Border Ranges ultramafic and mafic complex, south-central Alaska: cumulate fractionates of island-arc volcanics." Canadian Journal of Earth Sciences 22, no. 7 (1985): 1020–38. http://dx.doi.org/10.1139/e85-106.

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A discontinuous, elongate zone of mafic and ultramafic plutonic rock crops out in south-central Alaska for a distance of more than 1000 km. Intermediate- and detailed-scale geologic mapping, petrographic study, and compositional data suggest that the plutonic rocks are compositionally, petrologically, and mineralogically distinct from rocks in mid-ocean ridge and back-arc basin ophiolites. The mafic and ultramafic rocks instead represent part of the plutonic core of an intraoceanic island arc.The mafic–ultramafic zone, referred to as the Border Ranges ultramafic and mafic complex (BRUMC), is c

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Sugavanam, E. B., C. Mallikarjuna, and K. T. Vidyadharan. "Archaean Meta Lamprophyres from Nuggihalli Schist Belt, Hassan District - Karnataka." Journal Geological Society of India 43, no. 2 (1994): 115–37. http://dx.doi.org/10.17491/jgsi/1994/430202.

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Abstract The Archaean Dharwar greenstone belts of Karnataka predominantly consist of iron enriched tholeiitic Metabasalts, basaltic komatiites, sulphidic chert bands and argillite-graywacke sequence. In Nuggihalli schist belt, in association with mafic-ultramafic rocks, calc-alkaline lamprophyres (Spessartite-Kersantite suite), comparable with Kamblada-Yilgam of Western Australia, have been recorded for the first time. Gold mineralisation is associated with these meta-lamprophyres. The lamprophyres, in Nuggihalli belt, is a highly banded hornblende-biotite rich quartzo-felspathic rock, forming

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Shabutdinov, Timur D., Dmitry E. Saveliev, Ruslan A. Gataullin, and Aidar A. Samigullin. "Mineralogical Features of Ultramafic and Mafic Rocks of Syum-Keu Ophiolite (Polar Urals, Russia): Implications for Petrology and Paleogeodynamics." Minerals 14, no. 12 (2024): 1245. https://doi.org/10.3390/min14121245.

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The Syum-Keu massif is the northernmost ophiolite complex of the Ural mobile belt. It differs from other massifs of the Polar Urals due to the prominent distribution of lherzolites in the upper mantle section. This feature aligns it more closely to some massifs in the southern part of the belt (Kraka). Thus, a comparison of the ultramafic rock compositions in these massifs is highly relevant. Thus, comparing the compositions of ultramafic rocks from these massifs is highly relevant and is one of the primary objectives of this study. Our second objective is to study the microstructural features

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Fedortchouk, Yana, and William LeBarge. "Sources of placer platinum in Yukon: provenance study from detrital minerals." Canadian Journal of Earth Sciences 45, no. 8 (2008): 879–96. http://dx.doi.org/10.1139/e08-032.

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Source rocks for the platinum group minerals (PGM), historically reported in a number of Yukon placers, remain either unknown or poorly understood. A study of heavy-mineral samples from five creeks draining bedrock in west and central Yukon was undertaken to confirm the presence of placer platinum, to determine which mafic–ultramafic rock is the source of PGM in Kluane area, southern Yukon, and to explain platinum occurrences in Canadian and Florence creeks, central Yukon, where no known mafic–ultramafic rocks are present. Diverse composition of chromian spinel and clinopyroxenes from three cr

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Arafin, Sayyadul, and Ram N. Singh. "Thermal and Transport Properties of Mafic and Ultramafic Rocks of Oman Ophiolite." Sultan Qaboos University Journal for Science [SQUJS] 21, no. 1 (2016): 69. http://dx.doi.org/10.24200/squjs.vol21iss1pp69-81.

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Thermal and other physical properties of rocks and minerals are of considerable significance for deriving mineralogical and compositional models of the Earth's mantle. We have determined these properties for the mafic rock such as gabbro and ultramafic rock like harzburgite of the Oman ophiolite suite by utilizing the Debye characteristic property ,Θ-

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Salisbury, Matthew H., and Nikolas I. Christensen. "Olivine fabrics in the Bay of Islands Ophiolite: implications for oceanic mantle structure and anisotropy." Canadian Journal of Earth Sciences 22, no. 12 (1985): 1757–66. http://dx.doi.org/10.1139/e85-186.

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Petrofabric analysis of oriented ultramafic and mafic rock samples from six traverses representing all four massifs of the Bay of Islands ophiolite complex, Newfoundland, indicate that the ultramafic rocks are tectonites displaying fabrics consistent with high-temperature plastic flow on the olivine (010) [100] and (0kl) [100] slip systems. The fabric orientation is uniform in three of the four massifs but varies between massifs, suggesting differential rotation before or during emplacement. Within North Arm Mountain, the olivine a axes are aligned approximately perpendicular to the sheeted di

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Hasria, Masri, Muhammad Arba Azzaman, and Muhamad Jerniawan. "Petrogenetic Study on Ultramafic Rocks from Waturapa and Surrounding Areas, South Konawe Regency, Southeast Sulawesi Province." Journal of Geoscience, Engineering, Environment, and Technology 8, no. 1 (2023): 10–16. http://dx.doi.org/10.25299/jgeet.2023.8.1.11035.

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The petrogenesis study of ultramafic igneous rocks in the South Konawe Region has been carried out by several previous researchers, however, petrogenesis of ultramafic igneous rocks in the Waturapa Region has never been carried out in detail. This study aims to determine the characteristics and petrogenesis of ultramafic igneous rocks in the Waturapa area using petrographic and geochemical analysis using the XRF method. Petrographic analysis was carried out to determine the relative abundance percentage of primary minerals in the form of olivine, clinopyroxene, orthopyroxene, and opaque minera

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Brooks, Kent. "Peridotites and other ultramafic rocks." Geology Today 40, no. 5 (2024): 201–7. http://dx.doi.org/10.1111/gto.12491.

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Peridotites are a group within the category of ultramafic rocks. These are usually dark‐coloured rocks rich in magnesium, poor in silica and lacking feldspars. Earth's mantle, which makes up 83 percent by volume and 67 percent by weight of the planet, consists largely of peridotite, which, although relatively sparse at the surface, therefore, is Earth's most abundant rock type. Unfortunately, the mantle, which lies on average at >7 km under the oceans and >35 km under the continents, is not directly accessible for observation and our information comes largely from seismic studies, inclus

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Petrounias, Petros, Panagiota P. Giannakopoulou, Aikaterini Rogkala, et al. "Influence of Petrogenesis on the Engineering Properties of Ultramafic Aggregates and on Their Suitability in Concrete." Applied Sciences 12, no. 8 (2022): 3990. http://dx.doi.org/10.3390/app12083990.

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This study focuses on the use of petrology as a useful tool in construction applications (i.e., concrete). More specifically, this study investigates how the petrogenetic characteristics of ultramafic rocks derived from ophiolite complexes (Veria–Naousa, Gerania) can act as a key tool for the prediction of the final behaviour of ultramafic aggregates as concrete aggregates. For this reason, their petrographic, chemical and mineralogical characteristics were examined and correlated with their engineering properties for evaluating their suitability as concrete aggregates. This study had come up,

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Pedro, Jorge, António A. Araújo, Patrícia Moita, et al. "Mineral Carbonation of CO2 in Mafic Plutonic Rocks, I—Screening Criteria and Application to a Case Study in Southwest Portugal." Applied Sciences 10, no. 14 (2020): 4879. http://dx.doi.org/10.3390/app10144879.

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This article describes the screening, ranking and characterization of ultramafic and mafic rocks in southern Portugal for mineral carbonation as an alternative to conventional CO2 storage in sedimentary rocks. A set of criteria including mineralogy, structure, surface area, distance to CO2 sources, expected volume, and socioeconomic conditions was applied to screen ultramafic and mafic rock massifs in the Alentejo region, southern Portugal. Ranking of the massifs indicated that the plutonic massifs of Sines and of Torrão‒Odivelas were the most promising. A characterization was made of the Sine

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Zhao, Xiaoyan, Kunpeng Li, Dian Xiao, and Xun Li. "Experimental Study of the Mechanism of Acid Rain-Gabbro Interaction." E3S Web of Conferences 98 (2019): 01053. http://dx.doi.org/10.1051/e3sconf/20199801053.

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As a common natural disaster, acid rain could not only cause serious environmental pollution, but also endanger the engineering properties of rock due to water-rock interactions. The failure of slopes of mafic igneous or ultramafic igneous rock is not unusual in areas affected by acid rain, but the specific mechanism of instability remains to be studied. In this study, fresh gabbro samples were processed, and a simulated acid rain treatment of pH 3.0 in the laboratory was carried out. Then the shear strength parameters were evaluated on samples before and after the acid rain test. Finally, the

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Taksavasu, Tadsuda, Piyanat Arin, Thanakon Khatecha, and Suchanya Kojinok. "Microtextural Characteristics of Ultramafic Rock-Forming Minerals and Their Effects on Carbon Sequestration." Minerals 14, no. 6 (2024): 597. http://dx.doi.org/10.3390/min14060597.

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Ultramafic rocks are promising candidates for carbon sequestration by enhanced carbon dioxide (CO2) mineralization strategies due to their highly CO2-reactive mineral composition and their abundant availability. This study reports the mineralogy and microtextures of a representative ultramafic rock from the Ma-Hin Creek in northern Thailand and provides evidence of CO2 mineralization occurring through the interaction between CO2 and the rock in the presence of water under ambient conditions. After sample collection, rock description was determined by optical petrographic analysis. The rock pet

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Guo, Haiming, Yanguang Li, Bo Chen, et al. "The Genesis of Ultramafic Rock Mass on the Northern Slope of Lüliang Mountain in North Qaidam, China." Minerals 14, no. 9 (2024): 871. http://dx.doi.org/10.3390/min14090871.

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The ultramafic rock located on the northern slope of Lüliang Mountain in the northwestern region of North Qaidam Orogen is altered to serpentinite. The occurrence of disseminated chromite within the serpentinite holds significant implications for understanding the petrogenesis of the protolith. This work provides strong evidence of a distinct zonal texture in the chromite found in the ultramafic rock, using petrographic microstructure and electron probe composition analysis. The core of the chromite is characterized by high contents of Cr#, with enrichment in Fe3+# (Fe3+/(Cr + Al + Fe3+)) and

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Srikantia, S. V., and S. S. Bose. "Archaean Komatiites from Banasandra Area of Kibbanahalli Arm Of Chitradurga Supracrustal Belt in Karnataka." Journal Geological Society of India 26, no. 6 (1985): 407–17. http://dx.doi.org/10.17491/jgsi/1985/260605.

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Abstract The Banasandra Komatiites occur within the Kibbanahalli arm of the Chitradurga supracrustal Belt in Karnataka. They apparently overlie the Bababudan Group and the Peninsular Gneiss and occur in two isolated exposures, (i) east of Birasandra, and (ii) near Kodihalli - Kunikenahalli. Ultramafic rock types include pillowed serpentinites, spinifex-textured komatiite, massive and schistose serpentinite and talc-tremolite-chlorite schist. Certain quartz-antigorite (birbirite ?), quartz-amphibole, and high-magnesian chlorite rocks are also closely associated with the ultramafics. The major e

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Dyer, Richard D., and Peter J. Barnett. "Multimedia exploration strategies for PGEs: insights from the Surficial Geochemistry Case Studies Project, Lake Nipigon Region Geoscience Initiative, northwestern Ontario." Canadian Journal of Earth Sciences 44, no. 8 (2007): 1169–202. http://dx.doi.org/10.1139/e07-031.

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The Surficial Geochemistry Case Studies Project in the Lake Nipigon region involved detailed Quaternary mapping and multimedia geochemical sampling within five case study areas. Two of these areas, Lac des Iles and Tib Lake, contain known platinum group element (PGE) mineralization. The other three case study areas feature drainage catchments with lakes that contain anomalous levels of PGEs in bottom sediment. Surficial media sampled included till, soils, stream sediment, lake sediment, peat, surface water, and groundwater. Over Archean terrain, such as at Lac des Iles and Tib Lake, there is e

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Nomuulin, Amarbayar, Noriyoshi Tsuchiya, Otgonbayar Dandar, et al. "Multi-stage serpentinization of ultramafic rocks in the Manlay Ophiolite, southern Mongolia." Mongolian Geoscientist 26, no. 53 (2021): 1–17. http://dx.doi.org/10.5564/mgs.v26i53.1787.

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Serpentinization of ultramafic rocks in ophiolites is key to understanding the global cycle of elements and changes in the physical properties of lithospheric mantle. Mongolia, a central part of the Central Asian Orogenic Belt (CAOB), contains numerous ophiolite complexes, but the metamorphism of ultramafic rocks in these ophiolites has been little studied. Here we present the results of our study of the serpentinization of an ultramafic body in the Manlay Ophiolite, southern Mongolia. The ultramafic rocks were completely serpentinized, and no relics of olivine or orthopyroxene were found. The

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Mohanty, William K., Animesh Mandal, S. P. Sharma, Saibal Gupta, and Surajit Misra. "Integrated geological and geophysical studies for delineation of chromite deposits: A case study from Tangarparha, Orissa, India." GEOPHYSICS 76, no. 5 (2011): B173—B185. http://dx.doi.org/10.1190/geo2010-0255.1.

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In Orissa, India, chromite deposits occur in a NE-SW trending belt as discontinuous pods associated with tectonically deformed and metamorphosed ultramafic rocks. Geological mapping and detailed geophysical survey (including gravity, magnetic, electrical, and electromagnetic methods) for exploring chromite were conducted in a [Formula: see text] area at Tangarparha, located within the belt. Lithologies include sheared granite, quartzofeldspathic gneiss, and mafic/ultramafic rocks. The calculated Bouguer anomaly map shows a distinct positive anomaly (up to 16 mGal) in the northern part of the a

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Rezaee, Reza. "Quantifying Natural Hydrogen Generation Rates and Volumetric Potential in Onshore Serpentinization." Geosciences 15, no. 3 (2025): 112. https://doi.org/10.3390/geosciences15030112.

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This study explores the generation of natural hydrogen through the serpentinization of onshore ultramafic rocks, highlighting its potential as a clean energy resource. By investigating critical factors such as mineral composition, temperature, and pressure, the research develops an empirical model using multiple regression analysis to predict hydrogen generation rates under varying geological conditions. A novel five-stage volumetric calculation methodology is introduced to estimate hydrogen production from ultramafic rock bodies. The application of this framework to the Giles Complex, an ultr

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Guice, George, Iain McDonald, Hannah Hughes, et al. "Assessing the Validity of Negative High Field Strength-Element Anomalies as a Proxy for Archaean Subduction: Evidence from the Ben Strome Complex, NW Scotland." Geosciences 8, no. 9 (2018): 338. http://dx.doi.org/10.3390/geosciences8090338.

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The relative depletion of high field strength elements (HFSE), such as Nb, Ta and Ti, on normalised trace-element plots is a geochemical proxy routinely used to fingerprint magmatic processes linked to Phanerozoic subduction. This proxy has increasingly been applied to ultramafic-mafic units in Archaean cratons, but as these assemblages have commonly been affected by high-grade metamorphism and hydrothermal alteration/metasomatism, the likelihood of element mobility is high relative to Phanerozoic examples. To assess the validity of HFSE anomalies as a reliable proxy for Archaean subduction, w

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Jacobs, Anthony, Michael Hitch, Sara Mosallanejad, Tejas Bhatelia, Jiajie Li, and Faezeh Farhang. "Mineral Carbonation Potential (MCP) of Mine Waste Material: Derivation of an MCP Parameter." Minerals 13, no. 9 (2023): 1129. http://dx.doi.org/10.3390/min13091129.

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The heterogenous mineralogy of ultramafic deposits hosting mining operations makes it challenging to accurately determine the waste rock’s mineral carbonation potential (MCP). Additionally, the significantly higher carbonation capabilities of olivine than serpentine add to the difficulty. To address this issue, in this work, a new and unique tool called the MCP calculator was developed as a Microsoft ExcelTM spreadsheet to accurately determine the amount of anthropogenic CO2 that a given rock mass can sequester through mineral carbonation. The program estimates the modal mineral abundance of u

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Zozulya, Dmitry R., Kåre Kullerud, Enrico Ribacki, Uwe Altenberger, Masafumi Sudo, and Yevgeny E. Savchenko. "The Newly Discovered Neoproterozoic Aillikite Occurrence in Vinoren (Southern Norway): Age, Geodynamic Position and Mineralogical Evidence of Diamond-Bearing Mantle Source." Minerals 10, no. 11 (2020): 1029. http://dx.doi.org/10.3390/min10111029.

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During the period 750–600 Ma ago, prior to the final break-up of the supercontinent Rodinia, the crust of both the North American Craton and Baltica was intruded by significant amounts of rift-related magmas originating from the mantle. In the Proterozoic crust of Southern Norway, the 580 Ma old Fen carbonatite-ultramafic complex is a representative of this type of rocks. In this paper, we report the occurrence of an ultramafic lamprophyre dyke which possibly is linked to the Fen complex, although 40Ar/39Ar data from phenocrystic phlogopite from the dyke gave an age of 686 ± 9 Ma. The lamproph

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Hogarth, D. D., and J. C. Roddick. "Discovery of Martin Frobisher's Baffin Island "ore" in Ireland." Canadian Journal of Earth Sciences 26, no. 5 (1989): 1053–60. http://dx.doi.org/10.1139/e89-086.

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Five cobbles of metamorphosed ultramafic rock from the shores of southern Ireland are believed to have been derived from the ship Emanuel of Bridgwater in 1578. The Emanuel, one of Martin Frobisher's fleet, had loaded what was thought to be gold ore from three localities in southeast Baffin Island and, on the return journey, was wrecked and then beached on the western side of Smerwick Harbour, close to where the cobbles were found. One type of cobble, with brown hornblende, forsterite, and ilmenite, is similar to rock collected from Countess of Sussex mine, Baffin Island, which accounted for 2

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Irzon, Ronaldo, and Baharuddin Abdullah. "Geochemistry of Ophiolite Complex in North Konawe, Southeast Sulawesi." EKSPLORIUM 37, no. 2 (2016): 101. http://dx.doi.org/10.17146/eksplorium.2016.37.2.2868.

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ABSTRACTSoutheast Sulawesi is crosscutted by Lasolo Fault into two geological provinces: Tinondo and Hialu. Tinondo Geological Province is occupied largely by Ophiolite Complex in the northern part of Southeast Arm of Sulawesi. No study was conducted in relation to the geochemistry composition of Ophiolite Complex in North Konawe Regency. The aim of this study is to describe the ultramafic rock of the Ophiolite Complex in North Konawe Regency using field, geochemical, and petrographical analysis. Megascopically, the selected nine samples are described as greyish to blackish and fine to medium

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Asano, Kouhei, Katsuyoshi Michibayashi, and Tomohiro Takebayashi. "Rheological Contrast between Quartz and Coesite Generates Strain Localization in Deeply Subducted Continental Crust." Minerals 11, no. 8 (2021): 842. http://dx.doi.org/10.3390/min11080842.

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Deformation microstructures of peak metamorphic conditions in ultrahigh-pressure (UHP) metamorphic rocks constrain the rheological behavior of deeply subducted crustal material within a subduction channel. However, studies of such rocks are limited by the overprinting effects of retrograde metamorphism during exhumation. Here, we present the deformation microstructures and crystallographic-preferred orientation data of minerals in UHP rocks from the Dabie–Shan to study the rheological behavior of deeply subducted continental material under UHP conditions. The studied samples preserve deformati

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Leinonen, Seppo. "Exploration for Soapstone Occurrences: Use of Bulk Chemical Analyses to Select Potential Formation Areas." Key Engineering Materials 548 (April 2013): 10–19. http://dx.doi.org/10.4028/www.scientific.net/kem.548.10.

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Soapstone is a talc and carbonate containing metamorphic ultramafic rock commonly found in greenschist-amphibolite facies greenstone belts. The regional metamorphism and shear zones as pathways for CO2 containing water fluids are interpreted to have been essential to the formation of soapstone. In spite of the supposed uniform metamorphic conditions favourable to talc-carbonate soapstone, also unaltered serpentinites are usually found in the same location areas and deposits. The objective of this study is to define the bulk chemical response of ultramafic rocks to form soapstone in hydration-c

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Perchuk, A. L., N. G. Zinovieva, A. V. Sapegina, et al. "Meta-Ultramafic Rocks of the Maksyutov Complex, Southern Urals: High-Pressure Si-Al Metasomatism and Carbonatization at the Crust-Mantle Interface in the Subduction Zone." Петрология 32, no. 1 (2024): 59–90. http://dx.doi.org/10.31857/s0869590324010057.

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The eclogite-blueschists Maksyutov Complex is characterized by a complex fold-and-thrust structure that was developed during the Late Devonian collision between Baltica (East European Plate) and the Magnitogorsk Arc, that was formed during the Early Devonian intraoceanic subduction. Eclogites are the most studied rocks of the complex; their formation and exhumation are usually associated with the collisional stage of orogen development. At the same time, the origin of meta-ultramafic rocks, which together with eclogites form sheeted and lenses within metasedimentary rocks (shales and quartzite

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Yakich, Tamara, Matthew Brzozowski, Alexey Chernishov, et al. "Petrological Features of the Burlakski and Nizhne-Derbinsk Mafic-Ultramafic Plutons (East Sayan Mountains, Siberia, Russia)." Minerals 10, no. 2 (2020): 119. http://dx.doi.org/10.3390/min10020119.

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The Nizhne-Derbinsk mafic-ultramafic complex is located between the Central Asian Orogenic Belt and the Siberian Craton and, is associated with the Ballyk fault. The largest, spatially related to each other, plutons in the central part of the complex are the Burlakski and Nizhne-Derbinsk. Rocks in the main units of these plutons are divided into three groups: peridotites (ultramafic), pyroxenites (sub-ultramafic), and gabbroic rocks (mafic). The ultramafic and sub-ultramafic cumulate series are devoid of plagioclase and contain <3 vol. % chromian spinel. The Fo content of olivine in the sub

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Upton, B. G. J. "Gardar mantle xenoliths: Igdlutalik, South Greenland." Rapport Grønlands Geologiske Undersøgelse 150 (January 1, 1991): 37–43. http://dx.doi.org/10.34194/rapggu.v150.8139.

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A dyke of presumed Gardar age on Igdlutalik island near Narsaq contains an abundance of ultramafic xenoliths. Both host rock and xenoliths have been metamorphosed and the original mineral assemblages largely replaced by tremolite, chlorite and magnetite. Textural and geochemical evidence suggests: (a) that the host rock was a part of the ultramafic lamprophyre suite known throughout the Tugtut6q-Ilimaussaq-nunataq lineament, and (b) that the xenoliths were mantle-derived peridotites (possibly garnetiferous), together with some glimmerites that may be analogues of MARID-suite xenoliths known fr

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BOZKURT, ERDİN, JOHN A. WINCHESTER, MUHARREM SATıR, QUENTIN G. CROWLEY, and CHRISTIAN J. OTTLEY. "The Almacık mafic-ultramafic complex: exhumed Sakarya subcrustal mantle adjacent to the İstanbul Zone, NW Turkey." Geological Magazine 150, no. 2 (2012): 254–82. http://dx.doi.org/10.1017/s0016756812000556.

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AbstractThe Almacık Mountains in northwestern Turkey expose an upper-amphibolite-facies complex consisting of alternating ultramafic (harzburgitic and websteritic) and mafic (metagabbroic) rock types. In the eastern part of this complex are island arc meta-tholeiites and transitional to calc-alkaline metabasites that are chemically quite similar to those of the Permo-Triassic Çele mafic complex north of Bolu, and this suggests an equivalence. However, much of the section exposes structurally deeper and chemically different mafic and ultramafic rocks, which have no equivalent in the Çele mafic

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Widodo, Wahyu, Haryadi Permana, Ernowo Ernowo, et al. "AN UPDATE TO THE GEOLOGY OF SEBUKU ISLAND, SOUTH KALIMANTAN, INDONESIA: CONSTRAINTS FROM PETROLOGICAL STUDIES." Rudarsko-geološko-naftni zbornik 39, no. 5 (2024): 121–38. https://doi.org/10.17794/rgn.2024.5.9.

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Sebuku Island is located at the southeastern tip of Kalimantan Island and has geological similarities with the Bobaris-Meratus complex in distribution pattern and stratigraphic sequence. The pattern of straightness of geological structures between the two, both folds and faults, is generally directed from northeast-southwest to northwest-southeast. The previous geological research on Sebuku Island focused on the distribution of ultramafic rocks, which are speculated to contain iron, particularly from laterite soils. This research aims to determine the rock units in the study area to update the

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Ramos, Rodrigo Chaves, and Edinei Koester. "Lithogeochemistry of the meta-igneous units from Arroio Grande Ophiolitic Complex, southernmost Brazil." Brazilian Journal of Geology 45, no. 1 (2015): 65–78. http://dx.doi.org/10.1590/23174889201500010005.

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Ophiolites are defined as slices of genetically-related upper mantle serpentinized peridotites and oceanic crustal rocks, tectonically displaced from its primary igneous origin of formation by plate convergence and associated (meta) sedimentary rocks of marine origin. From this premise, a meta-ultramafic-mafic-sedimentary complex (Cr-rich magnesian schists - upper mantle or crustal ultramafic cumulate candidates; epidote amphibolites, metadiorites and metagabbros - oceanic crust candidates; metasedimentary schists, quartzites and marbles - marine sedimentary rocks candidates), located in south

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Canil, Dante, Stephen T. Johnston, Rameses J. D’Souza, and Larry M. Heaman. "Protolith of ultramafic rocks in the Kluane Schist, Yukon, and implications for arc collisions in the northern Cordillera." Canadian Journal of Earth Sciences 52, no. 7 (2015): 431–43. http://dx.doi.org/10.1139/cjes-2014-0138.

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Mafic and ultramafic rocks crop out as decimetre- to centimetre-sized bodies of talc–antigorite–olivine (±orthopyroxene) and chlorite–amphibole schists interleaved in the pelitic Kluane Schist of southwestern Yukon. The metamorphic assemblages in ultramafic rocks exposed at Doghead Point overprint two generations of cleavage and are consistent with metamorphism reaching >550 °C (talc + olivine) and >750 °C (olivine + enstatite) in the contact aureole of the Eocene Ruby Range batholith. The bulk rock major and trace element patterns in the ultramafic schists (>40 wt.% MgO, Mg/(Mg + Fe)

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Silva, Douglas Ramos Guelfi, Giuliano Marchi, Carlos Roberto Spehar, et al. "Characterization and nutrient release from silicate rocks and influence on chemical changes in soil." Revista Brasileira de Ciência do Solo 36, no. 3 (2012): 951–62. http://dx.doi.org/10.1590/s0100-06832012000300025.

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The expansion of Brazilian agriculture has led to a heavy dependence on imported fertilizers to ensure the supply of the growing food demand. This fact has contributed to a growing interest in alternative nutrient sources, such as ground silicate rocks. It is necessary, however, to know the potential of nutrient release and changes these materials can cause in soils. The purpose of this study was to characterize six silicate rocks and evaluate their effects on the chemical properties of treated soil, assessed by chemical extractants after greenhouse incubation. The experimental design consiste

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Lopes-Assad, Maria L., Simoni H. Avansini, Márcia M. Rosa, José R. P. de Carvalho, and Sandra R. Ceccato-Antonini. "The solubilization of potassium-bearing rock powder by Aspergillus niger in small-scale batch fermentations." Canadian Journal of Microbiology 56, no. 7 (2010): 598–605. http://dx.doi.org/10.1139/w10-044.

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The fungus Aspergillus niger was cultivated in culture medium with an alkaline ultramafic rock powder to evaluate the solubilization of potassium for biofertilizer production. The assays were carried out with 2 strains (CCT4355 and CCT911) in small-scale batch fermentations using 125, 500, 1000, and 2000 mL Erlenmeyer flasks, with a nominal volume of 40%, and rock powder at 0.4%, shaken at 160 r/min, incubated at 30 °C, and sampled every 7 days for 35 days. The amount of soluble K+, the pH of the culture medium, and the acidity were determined. Both strains solubilized K+ from the rock powder

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Mareoli, Eksel Setiawan, Riska Puspita, and Ninasafitri Ninasafitri. "Karakteristik Batuan Ultrabasa Di Desa Winatu Dan Kamarora, Kabupaten Sigi, Provinsi Sulawesi Tengah." Jurnal Teknologi Sumberdaya Mineral (JENERAL) 3, no. 2 (2022): 49. http://dx.doi.org/10.19184/jeneral.v3i2.35009.

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Ultramafic rocks are found in Sigi district in the Kamarora and Winatu areas but are not mentioned in the regional geology of the Poso sheet and the Pasangkayu sheet so that it is interesting to investigate further. Therefore, it is important to conduct this research to determine the characteristics and processes of ultramafic rock formation in the Kamarora and Winatu areas of Sigi district using the Petrographic and X-Ray Fluorescence (XRF) methods. The results of this study are based on petrographic analysis of two rock samples in Kamarora Village containing olivine (60-55%), omphasite (15-1

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