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Journal articles on the topic 'Alkalic igneous rocks. Petrology'

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Published: 4 June 2021

Last updated: 14 February 2022

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1

Watson, Ken, Lawrence C. Rowan, Timothy L. Bowers, Carmen Anton‐Pacheco, Pablo Gumiel, and Susanne H. Miller. "Lithologic analysis from multispectral thermal infrared data of the alkalic rock complex at Iron Hill, Colorado." GEOPHYSICS 61, no. 3 (1996): 706–21. http://dx.doi.org/10.1190/1.1443998.

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Airborne thermal‐infrared multispectral scanner (TIMS) data of the Iron Hill carbonatite‐alkalic igneous rock complex in south‐central Colorado are analyzed using a new spectral emissivity ratio algorithm and confirmed by field examination using existing 1:24 000‐scale geologic maps and petrographic studies. Color composite images show that the alkalic rocks could be clearly identified and that differences existed among alkalic rocks in several parts of the complex. An unsupervised classification algorithm defines four alkalic rock classes within the complex: biotitic pyroxenite, uncompahgrite

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2

West, David P., Dwight Bradley, and Raymond Coish. "The Litchfield Pluton in South-Central Maine: Carboniferous Alkalic Magmatism in northern New England, USA." Atlantic Geology 52 (June 30, 2016): 169. http://dx.doi.org/10.4138/atlgeol.2016.008.

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The Litchfield pluton is a poorly exposed 7 km2 composite alkalic intrusive complex that cuts previously deformed and metamorphosed Silurian turbidites in south-central Maine. The pluton includes a variety of alkaline syenites, including the type locality of “litchfieldite”, a coarse-grained cancrinite, sodalite, and lepidomelane bearing nepheline syenite first recognized over 150 years ago and common in many petrologic collections. A new U-Pb zircon age of 321 ± 2 Ma from the nepheline syenite is interpreted to represent the crystallization age of the plutonic complex. A new biotite 40Ar/39Ar

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3

Le Maitre, R. W. "Alkaline Igneous rocks." Geochimica et Cosmochimica Acta 52, no. 9 (1988): 2343. http://dx.doi.org/10.1016/0016-7037(88)90137-8.

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4

De Wit, Maarten J. "Alkaline igneous rocks." Lithos 24, no. 1 (1989): 81–82. http://dx.doi.org/10.1016/0024-4937(89)90017-0.

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5

Morris, Paul A., Tetsumaru Itaya, Shigeru Iizumi, Hiroo Kagami, R. John Watling, and Hisashi Murakami. "Age relations and petrology of alkalic igneous rocks from Oki Dozen, Southwest Japan." GEOCHEMICAL JOURNAL 31, no. 3 (1997): 135–54. http://dx.doi.org/10.2343/geochemj.31.135.

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6

Barr, Sandra M., Daniel Brisebois, and Alan S. Macdonald. "Carboniferous volcanic rocks of the Magdalen Islands, Gulf of St. Lawrence." Canadian Journal of Earth Sciences 22, no. 11 (1985): 1679–88. http://dx.doi.org/10.1139/e85-176.

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Volcanic rocks of Mississippian age occur on the Magdalen Islands as cap rocks and within collapse breccias above salt diapirs that have formed the islands. They consist of coarse volcaniclastic deposits and basaltic flows, intruded by minor mafic dykes and plugs. Petrologic studies of the basaltic rocks show that they are extensively altered. Original plagioclase, clinopyroxene, olivine, and interstitial glass are partially to entirely replaced by mixtures of chlorite, sericite, smectite, sphene, carbonate, epidote, albite, potassium feldspar, and iron oxides, and the samples display a relati

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7

MacDonald, Lisa A., Sandra M. Barr, Chris E. White, and John WF Ketchum. "Petrology, age, and tectonic setting of the White Rock Formation, Meguma terrane, Nova Scotia: evidence for Silurian continental rifting." Canadian Journal of Earth Sciences 39, no. 2 (2002): 259–77. http://dx.doi.org/10.1139/e01-074.

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The White Rock Formation in the Yarmouth area of the Meguma terrane of southern Nova Scotia consists mainly of mafic tuffaceous rocks with less abundant mafic flows, epiclastic and clastic sedimentary rocks, and minor intermediate and felsic crystal tuff. It is divided into seven map units that appear to young from west to east, inconsistent with a previously assumed synclinal structure. The White Rock Formation is flanked on both northwest and southeast by mainly the Cambrian to Lower Ordovician Halifax Formation; the western contact is interpreted to be a sheared disconformity, whereas the e

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8

Ogunyele, Abimbola Chris, Oladotun Afolabi Oluwajana, Iyanuoluwa Queen Ehinola, Blessing Ene Ameh, and Toheeb Akande Salaudeen. "Petrochemistry and petrogenesis of the Precambrian Basement Complex rocks around Akungba-Akoko, southwestern Nigeria." Materials and Geoenvironment 66, no. 3 (2020): 173–83. http://dx.doi.org/10.2478/rmzmag-2019-0036.

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AbstractField, mineralogical and petrochemical studies of the Precambrian Basement Complex rocks around Akungba-Akoko were carried out with the aim of determining their petrology, petrochemical characteristics and petrogenesis. The petrology of Akungba-Akoko area comprises migmatite, granite gneiss and biotite gneiss intruded by biotite granite, charnockite and minor felsic and basic rocks. Seventeen representative samples of the granite gneiss, biotite gneiss, biotite granite and charnockite were collected during field geological mapping of the area for petrographic and geochemical analyses.

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9

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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10

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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11

Stoppa, F., A. R. Woolley, and A. Cundari. "Extension of the melilite-carbonatite province in the Apennines of Italy: the kamafugite of Grotta del Cervo, Abruzzo." Mineralogical Magazine 66, no. 4 (2002): 555–74. http://dx.doi.org/10.1180/0026461026640049.

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AbstractA new occurrence of a rare kamafugite near L'Aquila, Abruzzo, is described in detail to characterize its paragenesis and to establish possible genetic links with similar alkaline mafic igneous rocks from the Oricola-Camerata Nuova (OC) volcanic field, ˜20 km to the west. Both occurrences belong to the Umbria-Latium-Ultralkaline-District (ULUD), an igneous district represented by rare kamafugites and carbonatites and distinct from the much more voluminous Roman Region (RR) rocks. The new kamafugite was found in a cave known as Grotta del Cervo (GC), associated with epiclastic and pyrocl

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12

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

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The study presents age data and petrologic characteristics of igneous rocks of the Zdraljica ophiolitic complex (ZOC), situated in central Serbia, 150 km south of Belgrade. The complex consists predominately of a MORB/VAB-like tholeutic suite, represented mostly by gabbros and diabases. The tholeiitic suite is intruded by calc-alkaline intermediate and acid magmas of a VA-affinity, which presumably formed in a pre-collisional setting. The whole complex is intruded by peraluminous granite magmas. The crystallization age of the calc-alkaline pre-collisional quartzdiorite is 168.4?6.7 Ma and it p

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13

Macdonald, R., H. E. Belkin, F. Wall, and B. Baginski. "Compositional variation in the chevkinite group: new data from igneous and metamorphic rocks." Mineralogical Magazine 73, no. 5 (2009): 777–96. http://dx.doi.org/10.1180/minmag.2009.073.5.777.

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AbstractElectron microprobe analyses are presented of chevkinite-group minerals from Canada, USA, Guatemala, Norway, Scotland, Italy and India. The host rocks are metacarbonates, alkaline and subalkaline granitoids, quartz-bearing pegmatites, carbonatite and an inferred K-rich tuff. The analyses extend slightly the range of compositions in the chevkinite group, e.g. the most MgO-rich phases yet recorded, and we report two further examples where La is the dominant cation in the A site. Patchily- zoned crystals from Virginia and Guatemala contain both perrierite and chevkinite compositions. The

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14

Brown, William L., and Ian Parsons. "Alkali feldspars: ordering rates, phase transformations and behaviour diagrams for igneous rocks." Mineralogical Magazine 53, no. 369 (1989): 25–42. http://dx.doi.org/10.1180/minmag.1989.053.369.03.

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AbstractHomogeneous and heterogeneous phase relationships in the alkali feldspars are reviewed, and behaviour diagrams developed. Al,Si ordering is almost certainly continuous and higher order in both albite and potassium feldspar and has been established reversibly or nearly so down to below 500°C in albite and possibly to ∼ 200°C in potassium feldspar. The degree of order in intermediate albite changes strongly over a range of ∼ 75–150°C depending on pressure, low albite being stable up to about 620–650°C and high albite above about 725°C at low pressure. Symmetry is broken at ∼ 980°C mainly

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15

Gibson, S. A., R. N. Thompson, O. H. Leonardos, S. E. Turner, J. G. Mitchell та A. P. Dickin. "The Serra do Bueno potassic diatreme: a possible hypabyssal equivalent of the ultramafic alkaline volcanics in the Late Cretaceous Alto Paranaίba Igneous Province, SE Brazil". Mineralogical Magazine 58, № 392 (1994): 357–73. http://dx.doi.org/10.1180/minmag.1994.058.392.02.

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AbstractCretaceous, strongly alkaline mafic igneous provinces occur around the margins of the Ordovician to Cretaceous Paraná sedimentary basin of southern Brazil. The Serra do Bueno diatreme is situated in the southern portion of the largest of these alkaline provinces, the Alto Paranaíba Igneous Province in Minas Gerais. The well-exposed diatreme crops out close to the south-west surface limit of the São Francisco craton and is adjacent to several other poorly exposed ultramafic alkaline pipes, previously described variously as kimberlites (Barbosa, 1991) and lamproites (Ramsay and Tompkins,

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16

Finch, Adrian A. "Conversion of nepheline to sodalite during subsolidus processes in alkaline rocks." Mineralogical Magazine 55, no. 380 (1991): 459–63. http://dx.doi.org/10.1180/minmag.1991.055.380.15.

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AbstractCathodoluminescence (CL) petrography of nepheline syenites of the Igaliko complex, Gardar province, South Greenland shows that sodalites possess embayed contacts against nepheline, and have formed by a process of metasomatic replacement. This texture is demonstrated clearly by CL, since sodalite luminesces bright orange and nepheline is poorly luminescent. The transformation from nepheline to sodalite results in a volume change which leads to a network of fractures in which deep-blue luminescent fluorite is precipitated. Fluorite is formed since the chlorination process involved in the

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17

Flohr, Marta J. K., and Malcolm Ross. "Alkaline igneous rocks of Magnet Cove, Arkansas: Mineralogy and geochemistry of syenites." Lithos 26, no. 1-2 (1990): 67–98. http://dx.doi.org/10.1016/0024-4937(90)90041-x.

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18

Marks, M. A. W., K. Hettmann, J. Schilling, B. R. Frost, and G. Markl. "The Mineralogical Diversity of Alkaline Igneous Rocks: Critical Factors for the Transition from Miaskitic to Agpaitic Phase Assemblages." Journal of Petrology 52, no. 3 (2011): 439–55. http://dx.doi.org/10.1093/petrology/egq086.

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19

Dudás, Francis Ö. "Geochemistry of igneous rocks from the Crazy Mountains, Montana, and tectonic models for the Montana Alkalic Province." Journal of Geophysical Research: Solid Earth 96, B8 (1991): 13261–77. http://dx.doi.org/10.1029/91jb00246.

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20

Barr, S. M., C. E. White, N. G. Culshaw, and J. WF Ketchum. "Geology and tectonic setting of Paleoproterozoic granitoid suites in the Island Harbour Bay area, Makkovik Province, Labrador." Canadian Journal of Earth Sciences 38, no. 3 (2001): 441–63. http://dx.doi.org/10.1139/e00-086.

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Paleoproterozoic granitoid rocks in the Island Harbour Bay area (Kaipokok domain, Makkovik Province, Labrador) are divided into four separate suites on the basis of field relations, petrology, and age. The redefined Island Harbour Bay plutonic suite consists of ca. 18951870 Ma dioritic to granitic (mainly granodioritic and granitic) units. The rocks are variably foliated as a result of emplacement under amphibolite-facies conditions in a dextral transpressive regime during Andean-type subduction. The dominant mafic mineral is biotite, and accessory epidote, allanite, and titanite are abundant

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21

Edgar, A. D., L. A. Pizzolato, and J. Sheen. "Fluorine in igneous rocks and minerals with emphasis on ultrapotassic mafic and ultramafic magmas and their mantle source regions." Mineralogical Magazine 60, no. 399 (1996): 243–57. http://dx.doi.org/10.1180/minmag.1996.060.399.01.

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AbstractIn reviewing the distribution of fluorine in igneous rocks it is clear that F abundance is related to alkalinity and to some extent to volatile contents. Two important F-bearing series are recognized: (1) the alkali basalt—ultrapotassic rocks in which F increases with increasing K2O and decreasing SiO2 contents; and (2) the alkali basalt—phonolite—rhyolite series with F showing positive correlation with both total alkalis and SiO2. Detailed studies of series (1) show that F abundance in ultrapotassic magmas (lamproite, kamafugite, lamprophyre) occurs in descending order in the sequence

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22

Mokhtari, Abdelkader, and Danielle Velde. "Xenocrysts in Eocene Camptonites from Taourirt, Northern Morocco." Mineralogical Magazine 52, no. 368 (1988): 587–601. http://dx.doi.org/10.1180/minmag.1988.052.368.04.

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AbstractA study of xenocrystic material included in 57 Ma igneous rocks that outcrop in the Taourirt area of north-east Morocco has been made. The mineralogy of the host rocks is essentially clinopyroxene, rare olivine, titanomagnetite and either kaersutite or biotite. Feldspars (plagioclase and alkali feldspar) and nepheline are usually altered. Accessories may include haüyne, perovskite and ferriannite-rich annite. The complex xenocrystic assemblage includes various types of clinopyroxene, amphiboles, micas of differing compositions and various types of spinel. These inclusions did not disso

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23

Philipp, Ruy P., Marcelo Lusa, and Lauro V. S. Nardi. "Petrology of dioritic, tonalitic and trondhjemitic gneisses from Encantadas Complex, Santana da Boa Vista, southernmost Brazil: paleoproterozoic continental-arc magmatism." Anais da Academia Brasileira de Ciências 80, no. 4 (2008): 735–48. http://dx.doi.org/10.1590/s0001-37652008000400013.

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The Encantadas Complex is a unit composed of dioritic, tonalitic and trondhjemitic gneisses with minor hornblendite. This complex is intruded by granites of Neoproterozoic age. Major and trace element data indicate metaluminous to slightly peraluminous composition related to the medium-K calc-alkaline series. Compositional parameters are consistent with a common evolution from less differentiated magmas, probably through fractional crystallization. The orthogneisses show LaN/YbN ratios from 10 to 50, K2O/Na2O varying from 1.1 to 3.0, Y contents from 3 to 39 ppm, Yb from 0.3 to 3.7, and Lu with

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24

Ladenburger, Sara, Michael A. W. Marks, Brian Upton, Peter Hill, Thomas Wenzel, and Gregor Markl. "Compositional variation of apatite from rift-related alkaline igneous rocks of the Gardar Province, South Greenland." American Mineralogist 101, no. 3 (2016): 612–26. http://dx.doi.org/10.2138/am-2016-5443.

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25

Mazzeo, F. C., I. Arienzo, M. Aulinas, M. Casalini, V. Di Renzo, and M. D'Antonio. "Mineralogical, geochemical and isotopic characteristics of alkaline mafic igneous rocks from Punta delle Pietre Nere (Gargano, Southern Italy)." Lithos 308-309 (May 2018): 316–28. http://dx.doi.org/10.1016/j.lithos.2018.03.015.

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26

Goldfarb, R. J., L. W. Snee, and W. J. Pickthorn. "Orogenesis, high-T thermal events, and gold vein formation within metamorphic rocks of the Alaskan Cordillera." Mineralogical Magazine 57, no. 388 (1993): 375–94. http://dx.doi.org/10.1180/minmag.1993.057.388.03.

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AbstractMesothermal, gold-bearing quartz veins are widespread within allochthonous terranes of Alaska that are composed dominantly of greenschist-facies metasedimentary rocks. The most productive lode deposits are concentrated in south-central and southeastern Alaska; small and generally nonproductive gold-bearing veins occur upstream from major placer deposits in interior and northern Alaska. Oreforming fluids in all areas are consistent with derivation from metamorphic devolatilisation reactions, and a close temporal relationship exists between high-T tectonic deformation, igneous activity,

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Ducassou, Céline, Marc Poujol, Erwan Hallot, Olivier Bruguier, and Michel Ballevre. "Petrology and geochronology of the high-K calc-alkaline Mésanger magmatism (Armorican massif, France): a ca. 320 Ma old volcano-plutonic association." Bulletin de la Société Géologique de France 182, no. 6 (2011): 467–77. http://dx.doi.org/10.2113/gssgfbull.182.6.467.

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Abstract The late stages of the Variscan orogeny in western and central Europe are characterized by the emplacement of numerous Carboniferous granitic intrusions. In the southern part of the Armorican massif, volcanic and plutonic rocks occur within the Carboniferous series of the Ancenis basin. Chemical analyses indicate that they belong to the same magmatic high-K calc-alkaline association of peraluminous composition, which likely derives from crustal melting of an igneous source. A LA-ICPMS U-Pb/zircon age of 319.3 ± 3.1 Ma dates, for the first time, this magmatic event and, by there, const

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28

Wu, Mingqian, Iain M. Samson, Kunfeng Qiu, and Dehui Zhang. "Concentration Mechanisms of Rare Earth Element-Nb-Zr-Be Mineralization in the Baerzhe Deposit, Northeast China: Insights from Textural and Chemical Features of Amphibole and Rare Metal Minerals." Economic Geology 116, no. 3 (2021): 651–79. http://dx.doi.org/10.5382/econgeo.4789.

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Abstract The Early Cretaceous Baerzhe deposit in Inner Mongolia, Northeast China, hosts a world-class resource of rare earth elements (REEs), niobium, zirconium, and beryllium. In contrast to previous interpretations of the deposit as a multiphase, miaskitic alkaline granite, our observations of the relationships of various rock phases, the textural features and chemical evolution of amphibole, and the distribution of primary and secondary mineral assemblages suggest that the igneous phases evolved from a hypersolvus porphyritic granite, through a variably altered transsolvus granite, both of

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29

Gwalani, L. G., N. M. S. Rock, W. J. Chang, S. Fernandez, C. J. All�gre, and A. Prinzhofer. "Alkaline rocks and carbonatites of Amba Dongar and adjacent areas, Deccan Igneous Province, Gujarat, India: 1. Geology, petrography and petrochemistry." Mineralogy and Petrology 47, no. 2-4 (1992): 219–53. http://dx.doi.org/10.1007/bf01161569.

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30

Kadel-Harder, Irene M., Paul G. Spry, Audrey L. McCombs, and Haozhe Zhang. "Identifying pathfinder elements for gold in bulk-rock geochemical data from the Cripple Creek Au–Te deposit: a statistical approach." Geochemistry: Exploration, Environment, Analysis 21, no. 1 (2020): geochem2020–048. http://dx.doi.org/10.1144/geochem2020-048.

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The Cripple Creek alkaline igneous rock-related, low-sulfidation epithermal gold telluride deposit, Colorado, is hosted in the 10 km wide Oligocene alkaline volcanic Cripple Creek diatreme in Proterozoic rocks. Gold occurs as native gold, Au-tellurides, and in the structure of arsenian pyrite, in potassically altered high-grade veins, and as disseminations in the host rocks.Correlation coefficients, principal component analysis, hierarchical cluster analysis and random forests were used to analyse major and trace element compositions of 995 rock samples primarily from low-grade gold mineraliza

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31

POTTER, J. "Abiogenic Fischer?Tropsch synthesis of hydrocarbons in alkaline igneous rocks; fluid inclusion, textural and isotopic evidence from the Lovozero complex, N.W. Russia." Lithos 75, no. 3-4 (2004): 311–30. http://dx.doi.org/10.1016/j.lithos.2004.03.003.

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32

Embey-Isztin, A., H. G. Scharbert, H. Dietrich, and H. Poultidis. "Mafic granulites and clinopyroxenite xenoliths from the Transdanubian Volcanic Region (Hungary): implications for the deep structure of the Pannonian Basin." Mineralogical Magazine 54, no. 376 (1990): 463–83. http://dx.doi.org/10.1180/minmag.1990.054.376.12.

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AbstractThe Transdanubian Volcanic Region (TVR) is composed mainly of Pliocene alkali basalts, basanites, olivine basalts and olivine tholeiites, as well as rare nephelinites. The partial melting and genesis of alkali basaltic liquids is a consequence of an upwelling of the upper mantle which also caused thinning of the lithosphere and recent sinking of the Pannonian Basin.Four different types of lower crustal and upper-mantle xenoliths are found within the TVR: garnet-free and garnet-bearing granulites, clinopyroxenites and spinel lherzolites. We present mineralogical and geochemical data on

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33

Valeton, I., A. Schumann, R. Vinx, and M. Wieneke. "Supergene alteration since the upper cretaceous on alkaline igneous and metasomatic rocks of the Poços de Caldas ring complex, Minas Gerais, Brazil." Applied Geochemistry 12, no. 2 (1997): 133–54. http://dx.doi.org/10.1016/s0883-2927(96)00060-1.

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Ernst, W. G. "How American Mineralogist and the Mineralogical Society of America influenced a career in mineralogy, petrology, and plate pushing, and thoughts on mineralogy's future role." American Mineralogist 105, no. 9 (2020): 1285–96. http://dx.doi.org/10.2138/am-2020-7382.

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Abstract My geologic research began at Carleton College. I studied heavy minerals in some midcontinent orthoquartzites, publishing my very first paper in American Mineralogist in 1954. As a master's candidate at the University of Minnesota, I investigated igneous differentiation in a diabase-granophyre sill of the Duluth Gabbro Complex. Later, in a Ph.D. program at Johns Hopkins University, I became Joe Boyd's apprentice at the Geophysical Laboratory (GL), and for a time was phase-equilibrium god of the Na-amphiboles. Doctoral research earned me an offer of a UCLA assistant professorship as a

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35

SHINJOE, HIRONAO, YUJI ORIHASHI, and TOMOAKI SUMII. "U-Pb zircon ages of syenitic and granitic rocks in the Ashizuri igneous complex, southwestern Shikoku: Constraint for the origin of forearc alkaline magmatism." GEOCHEMICAL JOURNAL 44, no. 4 (2010): 275–83. http://dx.doi.org/10.2343/geochemj.1.0070.

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36

Lidiak, Edward G., and Vincent M. Ceci. "Authigenic K-feldspar in the Precambrian basement of Ohio and its effect on tectonic discrimination of the granitic rocks." Canadian Journal of Earth Sciences 28, no. 10 (1991): 1624–34. http://dx.doi.org/10.1139/e91-145.

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Authigenic K-feldspar of apparent low-temperature origin is widespread in the uppermost part of the two main Precambrian basement terranes of Ohio: the subsurface extension of the Grenville Province of Canada, and the anorogenic granite–rhyolite terrane of the Transcontinental Proterozoic Province of the United States. The authigenic K-feldspar occurs mainly as a replacement of both primary K-feldspar and albitic plagioclase in a variety of igneous and metamorphic rocks and can be identified by a salmon color in plane or ordinary light, moderate to low optic angle, monoclinic or triclinic symm

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37

Eugster, Hans P. "Granites and hydrothermal ore deposits: a geochemical framework." Mineralogical Magazine 49, no. 350 (1985): 7–23. http://dx.doi.org/10.1180/minmag.1985.049.350.02.

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AbstractThe geochemical evolution of tin-tungsten deposits and their associated sulphides can be discussed in terms of four sequential processes: acquisition of the ore-forming elements (OFEs) by the granitic magma, emplacement of these elements in minerals and residual melt of the crystallizing granite, release of the OFEs to the circulating hydrothermal fluids and transport to the depositional sites, and finally, deposition of ore minerals through interaction of these fluids with the wall rock. Based on their crystallographic behaviour, it is useful to distinguish three principal classes of

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Ambrosio, Francesco Antonio. "A new statistical approach to the geochemical systematics of Italian alkaline igneous rocks." Open Geosciences 12, no. 1 (2020): 133–47. http://dx.doi.org/10.1515/geo-2020-0013.

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AbstractThe ultra-alkaline rocks have exotic features that frustrated many attempts to group them in a single classification diagram. A consistent classification would be very useful to define a possible consanguinity, an argument that feed a living debate. This paper investigates the petrologic characteristics of the Cenozoic Italian ultra-alkaline rock-suite using -Rank Entropy Anentropy (RHA) and Principal Component Analysis (PCA)-. The RHA formula is the succession of component’s symbols arranged according to the diminishing of their elemental content in the analysis (whole rock compositio

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Huong, Tran Thi, and Nguyen Hoang. "Petrology, geochemistry, and Sr, Nd isotopes of mantle xenolith in Nghia Dan alkaline basalt (West Nghe An): implications for lithospheric mantle characteristics beneath the region." VIETNAM JOURNAL OF EARTH SCIENCES 40, no. 3 (2018): 207–27. http://dx.doi.org/10.15625/0866-7187/40/3/12614.

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Study of petrological and geochemical characteristics of mantle peridotite xenoliths in Pliocene alkaline basalt in Nghia Dan (West Nghe An) was carried out. Rock-forming clinopyroxenes, the major trace element containers, were separated from the xenoliths to analyze for major, trace element and Sr-Nd isotopic compositions. The data were interpreted for source geochemical characteristics and geodynamic processes of the lithospheric mantle beneath the region. The peridotite xenoliths being mostly spinel-lherzolites in composition, are residual entities having been produced following partial mel

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Zou, Si-Yuan, Zi-Long Li, Biao Song, et al. "Zircon U–Pb dating, geochemistry and Sr–Nd–Pb–Hf isotopes of the Wajilitag alkali mafic dikes, and associated diorite and syenitic rocks: Implications for magmatic evolution of the Tarim large igneous province." Lithos 212-215 (January 2015): 428–42. http://dx.doi.org/10.1016/j.lithos.2014.09.005.

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MacKenzie, W. S. "J. G. Fitton B. G. J. Upton. Alkaline Igneous Rocks Oxford and Palo Alto Geological Society Special Publication No. 30. Blackwell Scientific Publications 1987 xiv+568 pp., 273 figs. Price £65·00." Mineralogical Magazine 52, no. 367 (1988): 558–59. http://dx.doi.org/10.1180/minmag.1988.052.367.23.

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McCallum, I. S. "Petrology of the igneous rocks." Reviews of Geophysics 25, no. 5 (1987): 1021. http://dx.doi.org/10.1029/rg025i005p01021.

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Buhlmann, Arndt L., Patricia Cavell, Ronald A. Burwash, Robert A. Creaser, and Robert W. Luth. "Minette bodies and cognate mica-clinopyroxenite xenoliths from the Milk River area, southern Alberta: records of a complex history of the northernmost part of the Archean Wyoming craton." Canadian Journal of Earth Sciences 37, no. 11 (2000): 1629–50. http://dx.doi.org/10.1139/e00-058.

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Minettes exposed in southern Alberta near the Milk River are the northern outliers of the Eocene Sweet Grass Hills igneous complex of the Montana alkalic igneous province. These minettes often contain coarse-grained xenoliths of phlogopite + clinopyroxene ± apatite. The parent magmas of the minettes were generated at pressures [Formula: see text]17 kbar in equilibrium with clinopyroxene + phlogopite ± olivine. Fractional crystallization and mixing provided a spectrum of evolved minettes and cumulates, the latter of which were sampled by subsequent minette magmas as xenoliths. Two xenoliths wer

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Watson, E. Bruce. "Origins of Igneous Rocks." Geochimica et Cosmochimica Acta 53, no. 11 (1989): 3108. http://dx.doi.org/10.1016/0016-7037(89)90194-4.

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Uvarova, Y. A., E. Sokolova, F. C. Hawthorne, et al. "Noonkanbahite, BaKNaTi2(Si4O12)O2, a new mineral species: description and crystal structure." Mineralogical Magazine 74, no. 3 (2010): 441–50. http://dx.doi.org/10.1180/minmag.2010.074.3.441.

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AbstractNoonkanbahite, ideally BaKNaTi2(Si4O12)O2, is described as a new mineral species. At Liley [Löhley], Eifel Mountains, Germany (the holotype locality), it occurs as sprays of prismatic crystals (up to 8 mm) or single prismatic crystals (up to 4 mm) on walls of cavities in alkaline igneous rocks. At Murun, Siberia, Russia, noonkanbahite forms coarse lamellar crystals up to 0.05 cm × 0.7 cm × 1.5 cm embedded in kalsilite syenite. Noonkanbahite is brittle, H = 6, Dobs. = 3.39(1), Dcalc. = 3.49 g/cm3, has a vitreous lustre and does not fluoresce in ultraviolet light. It has poor cleavage on

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Corretgé, L. G. "Igneous rocks of south-west England." Lithos 32, no. 1-2 (1994): 169–70. http://dx.doi.org/10.1016/0024-4937(94)90029-9.

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D'Lemos, Richard. "Igneous rocks of south-west England." Lithos 31, no. 3-4 (1994): 227–28. http://dx.doi.org/10.1016/0024-4937(94)90011-6.

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Frost, B. R., and C. D. Frost. "A Geochemical Classification for Feldspathic Igneous Rocks." Journal of Petrology 49, no. 11 (2008): 1955–69. http://dx.doi.org/10.1093/petrology/egn054.

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Barr, Sandra M. "Geochemistry and tectonic setting of late Precambrian volcanic and plutonic rocks in southeastern Cape Breton Island, Nova Scotia." Canadian Journal of Earth Sciences 30, no. 6 (1993): 1147–54. http://dx.doi.org/10.1139/e93-097.

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Late Precambrian volcanic–sedimentary belts in the Mira (Avalon) terrane of southeastern Cape Breton Island display differences in rock types, petrochemistry, and age, showing that they did not form contemporaneously above a single northwest-dipping subduction zone, as proposed in earlier models. The oldest rocks are 680 Ma mafic and felsic flows and tuffs, and abundant, mainly tuffaceous, sedimentary rocks in the Stirling belt. They are interpreted to have formed in a trough within or peripheral to a volcanic-arc complex. Northwest of the Stirling belt, the East Bay Hills, Coxheath Hills, and

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Boomeri, Mohammad, Rahele Moradi, and Sasan Bagheri. "Petrology and origin of the Lar igneous complex of the Sistan suture zone, Iran." Geologos 26, no. 1 (2020): 51–64. http://dx.doi.org/10.2478/logos-2020-0004.

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AbstractThe Oligocene Lar igneous complex is located in the Sistan suture zone of Iran, being emplaced in Paleocene to Eocene flysch-type rocks. This complex includes mainly intermediate K-rich volcanic (trachyte, latite and andesite) and plutonic (syenite and monzonite) rocks that belong to shoshonitic magma. The geochemical characteristics of the Lar igneous complex, such as an enrichment of LREE and LILE relative to HREE and HFSE, respectively, a negative anomaly of Ti, Ba and Nb and a positive anomaly of Rb and Th are similar to those of arc-type igneous rocks. Tectonic discrimination diag

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