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Journal articles on the topic 'Amphibole chemistry'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Ustalić, Samir, Ondrej Nemec, Stanislava Milovská, et al. "Amphibole Group Minerals in the Ozren Massif Ophiolites of Bosnia and Herzegovina as Petrogenetic Indicators." Minerals 14, no. 3 (2024): 239. http://dx.doi.org/10.3390/min14030239.

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The Ozren ophiolite complex (OOC) of the Dinaridic Ophiolite Belt is one of the six ophiolite complexes in Bosnia and Herzegovina. This paper deals with the mineral chemistry of amphiboles determined by electron probe micro-analysis and micro-Raman spectroscopy. The detected amphibole generations and types in mafic, ultramafic, and metamorphic rocks suggest a polystage evolution and are therefore useful petrogenetic indicators of the investigated OOC. Most gabbroic rocks and dolerites contain primary magmatic amphibole1 (magnesio-hornblende to pargasite, occasionally hastingsite) and prismatic

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2

Zhang, Xiaoli, Jinxian He, Zeqiang Ren, Taotao Zhou, Wenjie Cao, and Ben Xu. "Analysis of the Submicrostructural Deformation of Amphibole in a Ductile Shear Zone Based on the TEM Technique." Journal of Nanoscience and Nanotechnology 21, no. 1 (2021): 765–71. http://dx.doi.org/10.1166/jnn.2021.18466.

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Deformed amphibole in the plagioclase amphibolite mylonite of the Guandi Complex, Xishan, Beijing, is the research object in this study. The amphibole nanodeformation under the middle crust was analyzed using microstructural analysis and high-resolution transmission electron microscopy (TEM). Microscope observations show that the amphibolite deformations in the plagioclase amphibolite mylonite are δ and σ type porphyroclasts, and the porphyroclast tail is composed of new long-columnar crystals. Using transmission electron microscopy (TEM, and this acronyms would be defined only once), the auth

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3

Singh, Ankita A., D. Prakash, B. P. Singh, C. K. Singh, Manoj K. Yadav, and Rajeev K. Pandey. "Mineral Chemistry and IMA Nomenclature of Amphibole Minerals of Amphibolite Sills from Chhotanagpur Granite Gneiss Complex (CGGC), Southern Sonbhadra, Central India." Journal Of The Geological Society Of India 100, no. 5 (2024): 674–82. http://dx.doi.org/10.17491/jgsi/2024/173890.

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ABSTRACT In southern part of Sonbhadra District, near the Rihand Dam, low to medium grade amphibolites of Paleoproterozoic age are exposed. The outcrops are in the form of sills that occur at places in the Chhotanagpur Granite Gneiss Complex (CGGC). The essential mineralogical constituents of the amphibolite are amphibole-plagioclase-chlorite-biotite-iron oxides. Based on the mineral chemistry and interpretation as per the international mineralogical association (IMA) nomenclature scheme, amphiboles in the analysed amphibolite rock samples have been identified as magnesio-hornblende, magnesio-

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4

Rao, Rameshwar, and Hakim Rai. "Mineral chemistry of eclogites to investigate the evolutionary metamorphic history of UHP rocks from Tso-Morari region, Ladakh, India." Journal of Nepal Geological Society 40 (December 1, 2010): 13–20. http://dx.doi.org/10.3126/jngs.v40i0.23592.

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Micro textures of metabasics from the Tso-Morari region, Ladakh were studied in order to understand the evolutionary metamorphic history of eclogites. The mineral chemistry, paragenesis of mineral inclusions in garnet, and zoning in omphacite, garnet and amphibole suggest three main metamorphic stages: (i) an eclogite stage with late blueschist facies metamorphism, (ii) a medium-pressure amphibolite facies stage, and (iii) a low-pressure amphibolite to greenschist facies stage. The high Si content in phengite, presence of rutile besides almandine-rich garnet and omphacite in eclogites indicate

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5

Peretyazhko, Igor S., and Elena A. Savina. "Chemistry and Crystallization Conditions of Minerals in Metasomatized Oceanic Lithosphere and Basaltic Rocks of Govorov Guyot, Magellan Seamounts, Pacific Ocean." Minerals 12, no. 10 (2022): 1305. http://dx.doi.org/10.3390/min12101305.

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Studies have provided first detailed data on the chemistry of rock-forming, minor, and accessory minerals of Govorov Guyot volcanic rocks (basalts, trachybasalts, basaltic trachyandesites, and trachyandesites). Some basalt samples bear pargasitic amphibole and clinopyroxene xenocrysts, mantle vein fragments in xenoliths, as well as wehrlite xenoliths, which are remnants of metasomatized oceanic lithosphere. Amphiboles make up a continuous series from pargasite –Mg-hastingsite in wehrlite xenoliths and xenocrysts to Mg-hastingsite – kaersutite end-members in phenocrysts and microlites of basalt

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6

Green, Carlin J., Robert R. Seal, Nadine M. Piatak, William F. Cannon, Ryan J. McAleer, and Julia A. Nord. "Metamorphic amphiboles in the Ironwood Iron-Formation, Gogebic Iron Range, Wisconsin: Implications for potential resource development." American Mineralogist 105, no. 8 (2020): 1259–69. http://dx.doi.org/10.2138/am-2020-7211.

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Abstract The Paleoproterozoic Ironwood Iron-Formation, a Superior-type banded iron formation located in the western Gogebic Iron Range in Wisconsin, is one of the largest undeveloped iron ore resources in the United States. Interest in the development of this resource is complicated by potential environmental and health effects related to the presence of amphibole minerals in the Ironwood, a consequence of Mesoproterozoic contact metamorphism. The presence of these amphiboles and their contact metamorphic origin have long been recognized; however, recent interest in this resource has highlight

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7

Mihailova, Boriana, Giancarlo Della Ventura, Naemi Waeselmann, Simone Bernardini, Wei Xu, and Augusto Marcelli. "Polarons in Rock-Forming Minerals: Physical Implications." Condensed Matter 7, no. 4 (2022): 68. http://dx.doi.org/10.3390/condmat7040068.

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The existence of thermally-activated quasiparticles in amphiboles is an important issue, as amphiboles are among the main hydrous complex silicate minerals in the Earth’s lithosphere. The amphibole structure consists of stripes of 6-membered TO4-rings sandwiching MO6 octahedral slabs. To elucidate the atomistic origin of the anomalous rock conductivity in subduction-wedge regions, we studied several Fe-containing amphiboles with diverse chemistry by using in situ, temperature-dependent, polarised Raman spectroscopy. The occurrence of resonance Raman scattering at high temperatures unambiguousl

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8

Lyalina, L. M., Ya A. Pakhomovsky, J. A. Mikhailova, and E. A. Selivanova. "Amphibole Supergroup Minerals in the Lovozero Alkaline Massif (Kola Peninsula)." Zapiski RMO (Proceedings of the Russian Mineralogical Society) CLII, no. 6 (2023): 1–44. http://dx.doi.org/10.31857/s0869605523060023.

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On the base of published data and results of original researches, there were revealed 21 mineral species of the amphibole supergroup minerals in the Lovozero alkaline massif (Kola peninsula, Russia). Among them, 11 species belong to sodium amphiboles, 4 species are sodium-calcium amphiboles and 6 species – calcium ones. Sodium amphiboles are widely present in alkaline rocks of all complexes in the Lovozero massif – layered, eudialyte, and poikilitic complexes, in pegmatites and hydrothermal veins, as well as in roof xenoliths of volcanoclastic rocks of the trap formation. Magnesio-arfvedsonite

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9

Riyaz Ulla, M. S., A. M. Pathan, and P. Maaskant. "The Characterization of Metamorphic Facies of Metabasalts of Hutti Greenstone Belt." Journal Geological Society of India 47, no. 5 (1996): 547–54. http://dx.doi.org/10.17491/jgsi/1996/470504.

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Abstract The Hutti greenstone belt, containing several promising gold deposits is predominantly composed of metavolcanics represented by basalt with minor felsic volcanics and metasediments. Basalt has undergone regional metamorphism as indicated by the presence of characteristic metamorphic mineral assemblage of plagioclase, amphibole and chlorite. Electron microprobe studies are carried out on these minerals to study the chemistry and the mineral reactions in the rock. The analytical data indicate that plagioclase is andesine, amphibole is magnesio-hornblende and chlorite is ripidolite. The

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10

Drakoulis, A., A. Koroneos, T. Soldatos, and L. Papadopoulou. "Mineralogy and chemistry of amphiboles and thermobarometry of Papikion Mt pluton, Rhodope, Northern Greece." Bulletin of the Geological Society of Greece 47, no. 1 (2013): 373. http://dx.doi.org/10.12681/bgsg.11012.

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Papikion Mt pluton which intrudes Kardamos Dome, consists of biotite (Bi), hornblende (Hbl) and biotite-hornblende (Bi-Hbl) bearing rock types. In this work the relationship among the amphiboles of each Hbl-bearing rock type is studied. Moreover, their minimum crystallization pressure and temperature are estimated. The amphiboles of the Hbl granodiorite (GRD), the Bi-Hbl diorite (DR) and the Hbl diorite (DR) are classified mainly as magnesiohornblende and ferrohornblende and the amphiboles of the Bi-Hbl GRD as ferroedenite and hanstingsite. It is to note that some samples contain amphibole cry

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11

Ray, Jyotisankar. "Mineral Chemistry of Mafic Chain Silicate Minerals in the Torappadi Layered Complex of the Southern Granulite Terrain." Journal Geological Society of India 45, no. 5 (1995): 531–37. http://dx.doi.org/10.17491/jgsi/1995/450504.

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Abstract The chemistry of the mafic chain silicate minerals in the Torappadi layered ultramafic-mafic complex occurring in the southern granulite terrain of the Indian shield has been presented. The pyroxene compositions are found to be sympathetically related to the whole-rock chemistry; further the orthopyroxenes are discriminated to be metamorphic in terms of chemical parameter. All amphiboles of the complex are 'calcic' and their compositions spread from magnesio-hornblende to edenitic homblende/tschermakitic hornblende depending upon the rock-chemistry. Pyroxene geothermometry (assuming c

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12

Omer, Danar, Yousif Mohammad, and Irfan Yara. "Metamorphic Evolution of the Garnet Amphibolite Schist from Mawat Ophiolite, Kurdistan Region, Northeast Iraq: Geochemistry, Mineral Chemistry and Thermodynamic Approach." Iraqi Geological Journal 56, no. 1A (2023): 127–48. http://dx.doi.org/10.46717/igj.56.1a.10ms-2023-1-22.

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The garnet amphibolite schist is associated with the gabbroic unit of the Mawat ophiolite, Kurdistan region, Northeast Iraq, in the imbricated zone of the Zagros orogenic belt. Field observation, petrographic study, mineral chemistry, geochemical data, and thermodynamic modeling were used to demonstrate mineral identification, predict the observed stable mineral assemblages, and validate the protolith. The mineral assemblages of prograde are garnet (pyrope-almandine), chlorite (clinochlore), amphibole (grunerite), plagioclase (anorthite), iron oxides while the garnet (almandine-pyrope), chlori

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13

Petros, Jolyana, and Nihad Karo. "Petrogenesis of Amphibolite/Hornblendite Dikes in Qala-Diza Area, Iraqi Kurdistan Region." Iraqi Geological Journal 56, no. 2B (2023): 278–301. http://dx.doi.org/10.46717/igj.56.2b.22ms-2023-8-31.

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The amphibolite and hornblendite dikes occur as part of the igneous complexes of Bulfat Ophiolite within the Zagros Suture Zone, NE Iraq. The igneous complex is part of the upper allochthonous ophiolite terrane within the second unit of the Penjween-Walash Subzone. This article discusses the petrogenetic characteristics and tectonic setting of the amphibolite rocks based on their petrography, mineral chemistry, and whole-rock geochemistry. Petrographically, both banded and massive amphibolites reveal that the main mineral constituents are amphibole and plagioclase with accessory clinopyroxene,

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14

Nestola, F., D. Pasqual, M. D. Welch, and R. Oberti. "The effects of composition upon the high-pressure behaviour of amphiboles: compression of gedrite to 7 GPa and a comparison with anthophyllite and proto-amphibole." Mineralogical Magazine 76, no. 4 (2012): 987–95. http://dx.doi.org/10.1180/minmag.2012.076.4.14.

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AbstractA single-crystal X-ray diffraction study of a sample of natural gedrite from North Carolina, USA, with the crystal-chemical formula ANa0.47B(Na0.03Mg0.97Fe0.942+Mn0.02Ca0.04)C(Mg3.52Fe0.282+Al1.15Ti0.054+)T(Si6.31Al1.69)O22W(OH)2, up to a maximum pressure of 7 GPa, revealed the following bulk and axial moduli and their pressure derivatives: K0T = 91.2(6) GPa [K0T' = 6.3(2)]; K0T(a) = 60.5(6) GPa [K0T(a)' = 6.1(2)]; K0T(b) = 122.8(2.6) GPa [K0T(b)' = 5.7(8)]; K0T (c) = 119.7(1.5) GPa [K0T(c)' = 5.1(5)]. Gedrite has a much higher bulk modulus than anthophyllite (66 GPa) and proto-amphibo

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15

Bédard, Jean H. "Comparative amphibole chemistry of the Monteregian and White Mountain alkaline suites, and the origin of amphibole megacrysts in alkali basalts and lamprophyres." Mineralogical Magazine 52, no. 364 (1988): 91–103. http://dx.doi.org/10.1180/minmag.1988.052.364.08.

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AbstractAmphiboles in dykes from the dominantly silica-undersaturated Monteregian series range from pargasitic megacrysts and xenocrysts to kaersutitic, pargasitic and hastingsitic phenocrysts, groundmass prisms and reaction rims. Amphiboles in dykes and plutons from the silica-oversaturated White Mountain Magma Series range from kaersutite, through hornblende, hastingsite and edenite, to sodic-calcic and sodic varieties. This contrast between the amphiboles from the two series is probably a reflection of differing melt silica activity and is a useful petrologic discriminant. In most cases, pa

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16

Matteucci, Jared P., David M. Jenkins, and M. Darby Dyar. "Crystal chemistry and molar volume of potassic-chloro-hastingsite." European Journal of Mineralogy 36, no. 1 (2024): 247–66. http://dx.doi.org/10.5194/ejm-36-247-2024.

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Abstract. Several geological processes such as crustal and mantle metasomatism, high-grade metamorphism, and the formation of ore deposits involve the exchange of halogens, especially chlorine, between silicate minerals and fluids. It is well established that the presence of octahedral iron is vital to the process of Cl incorporation into amphiboles. However, other compositional controls on Cl incorporation, such as the effect of TAl, ANa, AK, and A-site occupancy are not as well constrained. This study reports on the compositional and structural relationships amongst a suite of 25 synthetic c

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17

Renna, Maria Rosaria. "Reactive interaction between migmatite-related melt and mafic rocks: clues from the Variscan lower crust of Palmi (southwestern Calabria, Italy)." European Journal of Mineralogy 35, no. 1 (2023): 1–24. http://dx.doi.org/10.5194/ejm-35-1-2023.

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Abstract. In the Variscan lower–intermediate crust exposed in the Palmi area (southwestern Calabria, Italy), amphibolites occur as foliated, decimeter-thick layers within migmatitic paragneiss and as a decametric main body adjacent to the migmatites. The main body is mostly fine-grained and weakly to moderately foliated; unfoliated medium-grained portions rarely occur. Amphibolites are mainly composed of plagioclase (An80−91) frequently developing triple junctions, amphibole consisting of cummingtonite rimmed by hornblende and variable amounts of biotite. Minor quartz is present in amphibolite

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18

Dada, Olusegun Adekoyejo. "APPLICATION OF AMPHIBOLE CHEMISTRY IN DETERMINING THE PETROGENESIS OF HORNBLENDE-BIOTITE GRANITES FROM TORO COMPLEX, NORTHCENTRAL, NIGERIA." Continental J. Earth Sciences 8, no. 1 (2013): 1–11. https://doi.org/10.5281/zenodo.833455.

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Amphibole chemistry of the hornblende-biotite (HB) and porphyritic hornblende-biotite (PHB) granites from Toro, North-central Nigeria has been studied by electron probe micro analysis, to determine its petrogenesis. Generally, the amphiboles are calcic with a wide compositional range. The amphiboles in the Toro hornblende-biotite (HB) granite are mainly hastingsite and with minor ferro-tschermakite, while the Toro porphyritic hornblende-biotite (PHB) granite clustered between hastingsite and ferro-pargasite. Their thermobarometry shows that they were emplaced under low fO<sub>2</sub>, medium t

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19

Klemme, Stephan, Jasper Berndt, Constantinos Mavrogonatos, et al. "On the Color and Genesis of Prase (Green Quartz) and Amethyst from the Island of Serifos, Cyclades, Greece." Minerals 8, no. 11 (2018): 487. http://dx.doi.org/10.3390/min8110487.

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The color of quartz and other minerals can be either caused by defects in the crystal structure or by finely dispersed inclusions of other minerals within the crystals. In order to investigate the mineral chemistry and genesis of the famous prase (green quartz) and amethyst association from Serifos Island, Greece, we used electron microprobe analyses and oxygen isotope measurements of quartz. We show that the color of these green quartz crystals is caused by small and acicular amphibole inclusions. Our data also shows that there are two generations of amphibole inclusions within the green quar

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20

Dimitrov, Martin, Banush Banushev, and Stefka Pristavova. "Morphological and chemical characteristics of amphibole crystals in desilicated pegmatites, Rila Mountain, SW Bulgaria." Review of the Bulgarian Geological Society 84, no. 3 (2023): 19–22. http://dx.doi.org/10.52215/rev.bgs.2023.84.3.19.

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The desilicated pegmatites from the area of the Urdini lakes, Northwest Rila Mountain intersect ultramafic bodies, occurring among high-grade metamorphic basement of the Rila-Rhodope batholith. The following rock-forming minerals are characteristic – plagioclase (mainly oligoclase), phlogopite, amphibole, actinolite, tremolite, anthophyllite, chlorite and others. Minerals from the amphibole supergroup are studied using optical, X-ray diffraction, X-ray spectral and chemical methods. Their morphology and crystal chemistry are characterized as well as their classification and nomenclature positi

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21

Wiszniewska, Janina, Anna Grabarczyk, Ewa Krzemińska, and Talat Ahmad. "Contribution to the Mineral Chemistry of the Proterozoic Aravalli Mafic Meta-Volcanic Rocks from Rajasthan, NW India." Minerals 10, no. 7 (2020): 638. http://dx.doi.org/10.3390/min10070638.

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Field, petrological and mineral chemistry for meta-volcanic rocks from the Aravalli sequence (Aravalli Craton, India) are presented. Field evidence such as volcanic flows and suspect pillow lava structures, dominant Fe-tholeiite lava flows intercalated with quartzites and argillaceous sediments, indicate rift tectonic environment. Primary mineralogy was obliterated during post-magmatic processes such as metamorphism corresponding to the greenschist to lower amphibolite facies conditions. The rock’s mineral composition was overprinted by plagioclase–chlorite–amphibole–epidote assemblage. The re

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22

Kamali, Amin Allah, Mohsen Moayyed, Nasir Amel, et al. "Mineralogy, mineral chemistry and thermobarometry of post-mineralization dykes of the Sungun Cu–Mo porphyry deposit (Northwest Iran)." Open Geosciences 12, no. 1 (2020): 764–90. http://dx.doi.org/10.1515/geo-2020-0009.

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AbstractThe Sungun copper–molybdenum porphyry deposit is located in the north of Varzaghan, northwestern Iran. The Sungun quartz-monzonite is the oldest mineralized intrusive body in the region and was emplaced during the Early Miocene. Eight categories of the late and unmineralized dykes, which include quartz diorite, gabbrodiorite, diorite, dacite, microdiorite and lamprophyre (LAM), intrude the ore deposit. The main mineral phases in the dykes include plagioclase, amphibole and biotite, with minor quartz and apatite and secondary chlorite, epidote, muscovite and sericite. The composition of

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23

Hawthorne, F. C., M. Schindler, Y. Abdu, E. Sokolova, B. W. Evans, and K. Ishida. "The crystal chemistry of the gedrite-group amphiboles. II. Stereochemistry and chemical relations." Mineralogical Magazine 72, no. 3 (2008): 731–45. http://dx.doi.org/10.1180/minmag.2008.072.3.731.

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AbstractThe general formula of the amphiboles of this series may be written as NaxMg2(Mg(5-y)Aly,)(Si(8-z)Alz)O22(OH)2, where Mg = Mg + Fe2+ + Mn2+ and Al = Al + Fe3+ + Ti. The individual <T–O> distances are linear functions of their [4]Al content, and the [4]Al content is strongly ordered in the following way: T1B > T1A » T2B » T2A. The <M1-O>, <M2-O> and <M3–O> distances are linear functions of the mean ionic radius of their constituent cations. End-member compositions may be written as follows: A☐Mg2Mg5Si8O22(OH)2O22(OH)2; A☐Mg2(Mg3Al2)(Si6Al2)O22(OH)2; ANaMg2Mg5(

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24

Mahabaleswar, B. "Mineral Chemistry of the Silicate Mineral Phases of Banded Iron-Formation of High-Grade Region, Karnataka." Journal Geological Society of India 28, no. 2-3 (1986): 165–78. http://dx.doi.org/10.17491/jgsi/1986/280203.

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Abstract Analytical data on the silicate mineral phases, namely, orthopyroxene, clinopyroxene, lamellar pyroxene, pyroxenoid, gamet, amphibole and biotite of ironformation from high-grade region, Karnataka are presented. It is inferred that Opx and Cpx of the iron-formation are ferro-hypersthene and ferro-augite respectively, whereas the pyroxenoid is a pyroxferroite. Garnets belong to pyralspite series. Amphiboles are represented by grunerite, edenite and ferroan pargasitic hornblende. Lamellar pyroxenes are represented by clinopyroxene and orthopyroxene containing lamellae which are Ca-poor

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25

Dyulgerov, Momchil. "Potassic syenite from Shipka, Central Balkan Mts, Bulgaria: characterization and insight into the source." Geologica Balcanica 40, no. 1-3 (2011): 3–12. http://dx.doi.org/10.52321/geolbalc.40.1-3.3.

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Petrographic, mineralogical and whole-rock chemistry data from a new outcrop of peralkaline potassic syenite of presumed Variscan age near the town of Shipka, are presented here. The syenites exhibit peralkaline chemistry and very potassic character which markedly differs from nearby situated potassic monzonites, known as Shipka pluton. In spite of the close spatial association of these two bodies, genetic link between them can hardly be supposed. The syenites are composed of K-feldspar, diopside, mica and late interstitial amphibole. Mineral composition reflects the agpaitic conditions of cry

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Akimova, E. Yu, and S. G. Skublov. "Mineralogy of Clinozoisite Amphibolites in the Khitoostrov Occurrence of Corundum-Bearing Rocks (Fenno-Scandinavian Shield)." Zapiski RMO (Proceedings of the Russian Mineralogical Society) CLII, no. 3 (2023): 59–81. http://dx.doi.org/10.31857/s0869605523030024.

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A study of composition of minerals (major and rare-earth elements) of clinozoisite amphibolites closely associated with corundum-bearing rocks at the Khitoostrov occurrence (North Karelia) was carried out. The clinozoisite amphibolites contain ferruginous phlogopite containing more Al than the ferruginous phlogopite in the host garnet amphibolites; calcium amphibole belongs to the chermakite–pargasite–sadanagaite series; the basic plagioclase which is absent in the host rocks, and margarite. Reactionary relationships of minerals are noted – plagioclase-amphibole symplectites around garnet porp

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27

REYES, CRISTINA NANCY. "Geotermobarometria y Quimica Mineral del Pluton Sienito "Pajeú" Serra Talhada, Pernambuco, NE de Brasil." Pesquisas em Geociências 25, no. 1 (1998): 61. http://dx.doi.org/10.22456/1807-9806.21174.

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The Pajeu Syenitic Complex, Serra Talhada, Pernambuco province, northeastern Brazil is tectonically emplaced within the framework of Neoproterozoic (Brasiliano). In the present work were studied whole rock and specific mineral chemical data (85’24” – 816’31” S and 3819’8” – 3836’2” W). Two distinct petrographic facies have been identified. The predominant porphyritic syenite facies is characterized by perthite microcline megacrysts (up to 8 cm long) and fine grained syenite; both facies have distributed melanocratic microgranular enclaves of syenitic composition. The mineral assemblage compris

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Abdel-Rahman, Abdel-Fattah M. "Chlorites in a spectrum of igneous rocks: mineral chemistry and paragenesis." Mineralogical Magazine 59, no. 394 (1995): 129–41. http://dx.doi.org/10.1180/minmag.1995.59.394.13.

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AbstractThe chlorite data presented are from four igneous complexes covering the compositional spectrum of igneous rocks (gabbro to granite) of orogenic and anorogenic settings. The four igneous complexes are; early orogenic gabbro-diorite-tonalite (D-T) suite, late orogenic granodiorite-adamellite (G-A) suite (both are calc-alkaline suites), high-alumina trondhjemite (TR), and anorogenic peralkaline granite (PGR).Chlorites in these igneous rocks show characteristic compositional fields. The Mg vs Fe plot provides the best discriminant, as data points define three compositionally different gro

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Huangfu, Mingzhu, Yiming Hu, Yongcheng Zhou, et al. "Flotation Characteristics of Amphibole-Type Oxidized Iron Ore via Reverse Anionic Flotation." Processes 11, no. 8 (2023): 2388. http://dx.doi.org/10.3390/pr11082388.

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To explore the flotation feasibility and flotation law of iron minerals from amphibole-type iron oxide ore with full-size minerals, a systematic study on the flotation behaviors of single minerals hematite, quartz, and amphibole was carried out with the anionic reverse flotation system. The effects of collectors, depressants, activators, and pH on the floatabilities of three single minerals was investigated. The flotation separations of binary mixed minerals and ternary mixed ores were carried out, respectively. The study results show that CaCl2 is adsorbed on the surfaces of quartz and amphib

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Neal, C. "The mineralogy and chemistry of fine-grained sediments, Morphou Bay, Cyprus." Hydrology and Earth System Sciences 6, no. 5 (2002): 819–31. http://dx.doi.org/10.5194/hess-6-819-2002.

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Abstract. The mineralogy and chemistry of the less than 20μm fraction of marine sediments at Morphou Bay, north-west Cyprus, are presented to characterise fine-grained sediment supplies from basic and ultrabasic rocks of the Troodos Massif within a typological setting. The sediments comprise a mixture of smectite, illite, kaolinite and iron rich chlorite. They also contain amorphous iron oxides/hydroxides, calcite (with some magnesium substitution for calcium) and an amphibole. Spatial patterns in mineralogy occur: the near-shore sediments are rich in smectite, chlorite, amphibole and amorphou

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Minh Tai, Nguyen, and Pham Trung Hieu. "Petrographical and mineral chemistry characteristics of mafic dykes in Nhi Ha area, Ninh Thuan and its meaning." Science and Technology Development Journal - Natural Sciences 2, no. 6 (2020): 201–13. http://dx.doi.org/10.32508/stdjns.v2i6.883.

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The NE-SW and NW-SE mafic dyke rocks in Nhi Ha area intruded through Cretaceous granitoid Dinh Quan or overlapped by Quaternary sediment materials. It has block type and blue grey in color in the field. Under microscope, based on minerals and textures, divided into 2 types of mafic dyke rock, such as diabase and porphyritic diabase. Minerals chemical analysis by EPMA method: plagioclase almost are labradorite (An 60.80%), oligoclase (An from 12.31 to 14.29%), some grain had albitation (An from 6.75 to 8.46%); pyroxene with augite (Wo41,80 En44,22 Fs13,98 to Wo43,40 En37,50 Fs19,10) and diopsit

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Oziegbe, E. J., V. O. Olarewaju, and O. O. Ocan. "MINERAL CHEMISTRY AND GEOCHEMISTRY OF HYPERSTHENE-BEARING DIORITE FROM ERUSU AKOKO, SOUTHWESTERN NIGERIA." Malaysian Journal of Geosciences 4, no. 1 (2020): 13–18. http://dx.doi.org/10.26480/mjg.01.2020.13.18.

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Samples of mafic intrusive rock were analyzed for their mineralogical and chemical properties. The textural relationship was studied using the petrographic microscope, elemental composition of minerals was determined using the Electron Microprobe and the whole rock chemical analysis was done using the XRF and ICP-MS. The following minerals were observed in order of abundance; pyroxene, amphibole, plagioclase, biotite, opaque minerals, quartz and chlorite, with apatite and zircon occurring as accessory mineral. Two types of pyroxenes were observed; orthopyroxene (hypersthene) and clinopyroxene.

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Mian, I., and M. J. Le Bas. "Sodic amphiboles in fenites from the Loe Shilman carbonatite complex, NW Pakistan." Mineralogical Magazine 50, no. 356 (1986): 187–97. http://dx.doi.org/10.1180/minmag.1986.050.356.01.

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AbstractThe carbonatites at Loe Shilman, near Khyber in NW Pakistan, fenitize their country rocks to form a metasomatic zone c.100 m wide of alternate dark blue (mafic) and pale grey (felsic) banded fenites which grade into unfenitized bedded slates and phyllites. The Na-amphiboles in the banded fenites form a complete solid solution series between magnesio-arfvedsonite and magnesio-riebeckite which coexist with varying proportions of aegirine, albite, and K-feldspar, with or without phlogopite or biotite.The amphiboles show a gradual decrease in Na2O, K2O, Mg ratio [100Mg/(Mg + FeT + Mn)] and

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Oberti, Roberta, and Subrata Ghose. "Crystal-chemistry of a complex Mn-bearing alkali amphibole ("tirodite") on the verge of exsolution." European Journal of Mineralogy 5, no. 6 (1993): 1153–60. http://dx.doi.org/10.1127/ejm/5/6/1153.

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Goncharov, Yu I., N. A. Kholodova, and N. E. Sergeev. "Amphibole-based thermal-insulating ceramics." Glass and Ceramics 47, no. 7 (1990): 267–70. http://dx.doi.org/10.1007/bf00676574.

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Germain Marie Monespérance, Mboudou, Owona Sebastien, Ndema Mbongue Jean Lavenir, Agyingi Christopher Mbaringong, Balla Ateba Moise Christian, and Emmanuel Eseya Mengu Junior. "Petrology of Precambrian metagranites and heavy mineral chemistry of the Olounou area within the Cameroon mineral belt (Ntem complex, South Cameroon): relationships with the Fe mineralization." Geochemistry: Exploration, Environment, Analysis 21, no. 3 (2021): geochem2021–006. http://dx.doi.org/10.1144/geochem2021-006.

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The petrology of Achaean biotite- and amphibole-rich metagranites, the geochemistry of Fe occurrences and heavy mineral concentrations in stream sediments from Olounou (Ntem complex) help to constrain their inter-relationships. These metagranites display granoblastic textures outlined by microcline, biotite, amphibole and oxides. Ilmenite (60 to 80%), zircon (15 to 20%) and rutile (1 to 2%) are the mineral fractions in pan concentrates. Two types of Fe mineralization as silicified veins cross-cut the above rocks: hematite ± magnetite quartzites with primary hematite enclosing magnetite relicts

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Schindler, M., E. Sokolova, Y. Abdu, F. C. Hawthorne, B. W. Evans, and K. Ishida. "The crystal chemistry of the gedrite-group amphiboles. I. Crystal structure and site populations." Mineralogical Magazine 72, no. 3 (2008): 703–30. http://dx.doi.org/10.1180/minmag.2008.072.3.703.

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AbstractThe crystal structures of twenty-five orthorhombic Fe-Mg-Mn amphiboles, a = 18.525 – 18.620, b = 17.806-18.034, c = 5.264-5.303 Å, V = 1737.6-1776.7, space group = Pnma, Z = 4, have been refined to R indices in the range 2.1–7.8% using 790–1804 unique observed reflections measured with Mo-Kα X-radiation on a Bruker P4 automated four-circle diffractometer equipped with a 1K CCD detector. The quality of the refinements is strongly a function of the [4]Al content of the crystals because of unmixing in the central part of the series due to the presence of a low-temperature solvus. The amph

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Panina, L. I., L. A. Mikhaleva, S. Z. Smirnov, I. V. Motorina, and L. N. Pospelova. "MINERAL CHEMISTRY AS A RESULT OF MELT MIXING (exemplified by globular camptonites from the Sangilen Upland, Tuva)." Russian Geology and Geophysics 35, no. 1 (1994): 100–108. https://doi.org/10.2113/rgg.1994.35.1.100.

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In the presence of mutually exclusive hypotheses on the formation of variolitic camptonites of Tuva (by liquid immiscibility or mixing of melts), additional material on chemical composition of rock-forming minerals is considered in detail to elucidate the correspondence of their features to one hypothesis or to the other. It is established that camptonites contain two varieties of pyroxene and amphibole with their specific trends of the evolution transformation: one is specific to alkaline basaltoids, the other, to syenite melts. The noticed features are: disequilibrium conditions of mineral c

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Palmer, H. C., and R. L. Barnett. "Amphibole and plagioclase chemistry in two Proterozoic dyke swarms and its relation to the uplift history of the Kapuskasing Structural Zone." Canadian Journal of Earth Sciences 29, no. 8 (1992): 1791–801. http://dx.doi.org/10.1139/e92-141.

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The gneisses of the Chapleau portion of the Kapuskasing Structural Zone (KSZ) and of the Wawa Gneiss Terrane (WGT) can be partitioned into subregions on the basis of magnetic polarity of 2.45 Ga Matachewan diabase dykes emplaced within them. West of the Ivanhoe Lake fault zone (ILFZ) the polarity sequence across the trend of the dyke swarm is normal–reverse–normal (N–R–N) over a traverse distance >100 km. Highly correlated with dyke N polarity is the presence of tea-coloured groundmass plagioclase and hornblende with high Al, Na, and Ti content. Reversely magnetized dykes within the WGT and

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Soret, Mathieu, Philippe Agard, Benoît Ildefonse, Benoît Dubacq, Cécile Prigent, and Claudio Rosenberg. "Deformation mechanisms in mafic amphibolites and granulites: record from the Semail metamorphic sole during subduction infancy." Solid Earth 10, no. 5 (2019): 1733–55. http://dx.doi.org/10.5194/se-10-1733-2019.

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Abstract. This study sheds light on the deformation mechanisms of subducted mafic rocks metamorphosed at amphibolite and granulite facies conditions and on their importance for strain accommodation and localization at the top of the slab during subduction infancy. These rocks, namely metamorphic soles, are oceanic slivers stripped from the downgoing slab and accreted below the upper plate mantle wedge during the first million years of intraoceanic subduction, when the subduction interface is still warm. Their formation and intense deformation (i.e., shear strain ≥5) attest to a systematic and

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Oberti, Roberta, Giancarlo Della Ventura, Massimo Boiocchi, Alberto Zanetti, and Frank C. Hawthorne. "The crystal chemistry of oxo-mangani-leakeite and mangano-mangani-ungarettiite from the Hoskins mine and their impossible solid-solution: An XRD and FTIR study." Mineralogical Magazine 81, no. 3 (2017): 707–22. http://dx.doi.org/10.1180/minmag.2016.080.124.

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AbstractNew chemical (EMP, SIMS) and structural data are reported for a suite of crystals of oxo-mangani-leakeite and mangano-mangani-ungarettiite from their common type locality, the Hoskins mine (New South Wales, Australia). Notwithstanding the low OH content, FTIR analysis of selected sampleshas provided considerable information on short-range order in these Mn3+-rich amphiboles, and shows that Li is associated with occupied A sites and is linked to the oxo-component at the O(3) site. Comparative analysis of all available data allows us to: (1) further improveour understanding of the crysta

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Della Ventura, G., F. Bellatreccia, F. Cámara, and R. Oberti. "Crystal-chemistry and short-range order of fluoro-edenite and fluoro-pargasite: a combined X-ray diffraction and FTIR spectroscopic approach." Mineralogical Magazine 78, no. 2 (2014): 293–310. http://dx.doi.org/10.1180/minmag.2014.078.2.05.

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AbstractThis study addresses the crystal chemistry of a set of five samples of F-rich amphiboles from the Franklin marble (USA), using a combination of microchemical (Electron microprobe analysis (EMPA)), single-crystal refinement (SREF) and Fourier transform infrared (FTIR) spectroscopy methods. The EMPA data show that three samples fall into the compositional field of fluoro-edenite (Hawthorne et al., 2012), whereas two samples are enriched in high-charged C cations and – although very close to theCR3+boundary – must be classified as fluoro-pargasite. Magnesium is by far the dominant C catio

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Cametti, Georgia, Thomas Armbruster, Leonid Z. Reznitsky, Evgeny V. Sklyarov, and Giancarlo Della Ventura. "Crystal structure and crystal-chemistry of vanadio-pargasite: a new amphibole from southern Lake Baikal, Siberia, Russia." European Journal of Mineralogy 30, no. 5 (2018): 981–87. http://dx.doi.org/10.1127/ejm/2018/0030-2758.

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Guotana, Juan, Tomoaki Morishita, Ryoko Yamaguchi, et al. "Contrasting Textural and Chemical Signatures of Chromitites in the Mesoarchaean Ulamertoq Peridotite Body, Southern West Greenland." Geosciences 8, no. 9 (2018): 328. http://dx.doi.org/10.3390/geosciences8090328.

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Peridotites occur as lensoid bodies within the Mesoarchaean orthogneiss in the Akia terrane of Southern West Greenland. The Ulamertoq peridotite body is the largest of these peridotites hosted within the regional orthogneiss. It consists mainly of olivine, orthopyroxene, and amphibole-rich ultramafic rocks exhibiting metamorphic textural and chemical features. Chromitite layers from different localities in Ulamertoq show contrasting characteristics. In one locality, zoned chromites are hosted in orthopyroxene-amphibole peridotites. Compositional zonation in chromites is evident with decreasing

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Keller, D. S., and J. J. Ague. "Quartz, mica, and amphibole exsolution from majoritic garnet reveals ultra-deep sediment subduction, Appalachian orogen." Science Advances 6, no. 11 (2020): eaay5178. http://dx.doi.org/10.1126/sciadv.aay5178.

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Diamond and coesite are classic indicators of ultrahigh-pressure (UHP; ≥100-kilometer depth) metamorphism, but they readily recrystallize during exhumation. Crystallographically oriented pyroxene and amphibole exsolution lamellae in garnet document decomposed supersilicic UHP majoritic garnet originally stable at diamond-grade conditions, but majoritic precursors have only been quantitatively demonstrated in mafic and ultramafic rocks. Moreover, controversy persists regarding which silicates majoritic garnet breakdown produces. We present a method for reconstructing precursor majoritic garnet

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Hasan, A. S. M. Mehedi, Ismail Hossain, Toshiaki Tsunogae, et al. "Mineralogy, geochemistry and monazite U-Th-Pb geochronology of the Hakimpur banded iron formation deposit, Bangladesh: a petrogenetic study." Bangladesh Journal of Scientific and Industrial Research 58, no. 4 (2023): 241–64. http://dx.doi.org/10.3329/bjsir.v58i4.70260.

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The Fe-rich deposits from Hakimpur (Bangladesh) are associated with a broad range of rock types including BIF, biotite schist, quartzite and amphibolite. Geochemical analysis coupled with petrographic studies indicates the BIF and BIF-hosted rocks were derived from sedimentary protoliths. In the sediments, clay minerals were altered at a certain thermobarometric condition during metamorphism: Clay (illite) → chlorite → biotite → amphibole, which is evident from silicification, chloritization, biotitization, saussuritization and epidotization in petrographic results. Monazite chemistry U-Th-Pb

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Nathwani, Chetan L., Matthew A. Loader, Jamie J. Wilkinson, Yannick Buret, Robert H. Sievwright, and Pete Hollings. "Multi-stage arc magma evolution recorded by apatite in volcanic rocks." Geology 48, no. 4 (2020): 323–27. http://dx.doi.org/10.1130/g46998.1.

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Abstract Protracted magma storage in the deep crust is a key stage in the formation of evolved, hydrous arc magmas that can result in explosive volcanism and the formation of economically valuable magmatic-hydrothermal ore deposits. High magmatic water content in the deep crust results in extensive amphibole ± garnet fractionation and the suppression of plagioclase crystallization as recorded by elevated Sr/Y ratios and high Eu (high Eu/Eu*) in the melt. Here, we use a novel approach to track the petrogenesis of arc magmas using apatite trace element chemistry in volcanic formations from the C

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Ward, Tony J., Julie F. Hart, Terry M. Spear, Brienne J. Meyer, and James S. Webber. "Fate of Libby Amphibole Fibers When Burning Contaminated Firewood." Environmental Science & Technology 43, no. 8 (2009): 2878–83. http://dx.doi.org/10.1021/es802817w.

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Oyeshomo, Anthony Victor, Uwe Altenberger, and Anthony Bolarinwa. "RETROGRESSION OF ORTHOPYROXENE – BEARING CHARNOCKITIC GNEISS AROUND IKERAM-IBARAM AKOKO, SOUTHWESTERN NIGERIA." Geological Behavior 8, no. 1 (2024): 82–89. https://doi.org/10.26480/gbr.02.2024.82.89.

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This paper presents the petrography and mineral chemistry of charnockitic gneisses exposed at Ikeram-Ibaram within the Precambrian Basement Complex of southwestern Nigeria. Quartz, plagioclase, perthite, amphibole, biotite and orthopyroxene are essential minerals, while apatite, ilmenite, magnetite and zircon are accessories. Orthopyroxene is ferro-hypersthene (En44Fs56Wo0) with low TiO2, CaO contents, but high in MgO compositions. Orthopyroxene is mantled by hornblende and relicts of biotite grains are found within orthopyroxene as inclusions. Plagioclase is andesine and occur as inclusions i

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Rizzo, Giovanna, Roberto Buccione, Marilena Dichicco, Rosalda Punturo, and Giovanni Mongelli. "Petrography, Geochemistry and Mineralogy of Serpentinite Rocks Exploited in the Ophiolite Units at the Calabria-Basilicata Boundary, Southern Apennine (Italy)." Fibers 11, no. 10 (2023): 81. http://dx.doi.org/10.3390/fib11100081.

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A multi-analytical study on serpentinites in the ophiolite units (Calabria-Basilicata boundary, southern Apennines) was carried out on samples collected from a serpentinite quarry, locally called “Pietrapica”, which sitsin the Pollino UNESCO Global Geopark. Optical microscopy observations revealed the petrographic characteristics, ICP-MS was used to assess the chemical composition while EMPA mineral chemistry, Raman spectroscopy and X-Ray Powder Diffraction and were used altogether to trace the mineral composition of the rocks. Petrography revealed that serpentinites from Pietrapica quarry are

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