Relevant bibliographies by topics / Plagioclase zoning

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Academic literature on the topic 'Plagioclase zoning'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Plagioclase zoning"

1

Hoshide, Takashi, and Masaaki Obata. "Zoning and resorption of plagioclase in a layered gabbro, as a petrographic indicator of magmatic differentiation." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 100, no. 1-2 (March 2009): 235–49. http://dx.doi.org/10.1017/s1755691009016090.

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ABSTRACTThe Murotomisaki Gabbroic Intrusion is a sill-like layered gabbro emplaced in sedimentary strata of Tertiary age in southwest Japan. The zoning (including resorption structures) and the compositional variations of plagioclase from throughout the intrusion were studied, and it was found that the zoning pattern may be classified into four types, which may well correlated with the hosting rock types, the mode of occurrences and their stratigraphic positions in the intrusion. The plagioclase zoning was successfully decoded, and the sequence of events that took place during the magmatic differentiation was deduced and further interpreted in the context of a stratified basal boundary layer slowly ascending in a solidifying magma body. It was shown that various layered structures – modal layering, podiform gabbroic pegmatites and anorthositic layers – observed in the Murotomisaki Gabbro were formed within the moving basal boundary layer by flushing of H2O-rich fluid and fractionated silicate melts from below. By the fluxing of hydrous fluids, plagioclase crystals preferentially dissolved and then melt fraction increased in the basal boundary layer. Under these circumstances, plagioclase-rich fractionated melts diapirically segregated from the crystal pile. Calcic plagioclases, which are out of equilibrium in the central part of the intrusion, may have originated from the basal boundary layer in this manner.
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L'Heureux, Ivan. "Oscillatory zoning in plagioclase: thermal effects." Physica A: Statistical Mechanics and its Applications 239, no. 1-3 (May 1997): 137–46. http://dx.doi.org/10.1016/s0378-4371(96)00474-8.

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3

Firouzkouhi, Zahra, Ali Ahmadi, David Richard Lentz, and Ali-Asghar Moridi-Farimani. "Mixing of basaltic and andesitic magmas in the Bazman volcanic field of southeastern Iran as inferred from plagioclase zoning." Mineralogical Magazine 81, no. 4 (August 2017): 975–85. http://dx.doi.org/10.1180/minmag.2017.081.001.

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AbstractLate Cenozoic basalts of the Bazman volcanic field, Makran volcanic arc of southern Iran, contain two types of plagioclase feldspar phenocrysts with significant textural and compositional differences. The most common type is rather homogeneous with only weak zoning and maximum An content of 83 mol.%. The less common type of phenocryst exhibits complex zoning and, other than rims, is close in composition and similar in texture to those of associated andesites. This type of plagioclase phenocryst is characterized by an engulfed core with oscillatory zoning, which is overgrown by sieve-textured, moderately zoned mantle, and a relatively narrow rim. In both rock types, the An content of the core is between 40 and 63 mol.% with abrupt fluctuations. No significant correlation between An content and MgO, FeO, SrO and BaO is apparent in the core of phenocrysts in basalts. Anorthite content of the core of phenocrysts in andesites inversely correlates with SrO and BaO. The mantle of plagioclase phenocrysts in both rock types is characterized by sharp increases of An (up to 41 mol.%), MgO, and FeO, in the contact with the core. Anorthite correlates positively with MgO and FeO in the mantle, but correlation between An and SrO and BaO is not evident. It is assumed that plagioclase phenocrysts originally crystallizing from the host andesitic magma were interrupted by mixing with a hotter, juvenile basaltic magma. The resulting changes in temperature, composition, and H2O content of the surrounding melt caused compositional zonation, and the development of resorption in the cores and sieve texture in the mantles. As the An contents of the rims of the phenocrysts resemble the average An content of the groundmass plagioclases in both rock types, it is thought that the two involved magmas gained their independent physical identity before the formation of compositionally-distinct rims of plagioclase phenocrysts.
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PEARCE, T., and A. KOLISNIK. "Observations of plagioclase zoning using interference imaging." Earth-Science Reviews 29, no. 1-4 (October 1990): 9–26. http://dx.doi.org/10.1016/0012-8252(0)90024-p.

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Pearce, T. "Observations of plagioclase zoning using interference imaging." Earth-Science Reviews 29, no. 1-4 (October 1990): 9–26. http://dx.doi.org/10.1016/0012-8252(90)90024-p.

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NIU, Zhijian, Yue LIU, and Yongjun DI. "Plagioclase Zoning as a Record of Magma Evolution." Acta Geologica Sinica - English Edition 88, s2 (December 2014): 1477–78. http://dx.doi.org/10.1111/1755-6724.12382_18.

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Perugini, Diego, Giampiero Poli, and Luca Valentini. "Strange attractors in plagioclase oscillatory zoning: petrological implications." Contributions to Mineralogy and Petrology 149, no. 4 (April 16, 2005): 482–97. http://dx.doi.org/10.1007/s00410-005-0667-6.

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Durant, D. G., and A. D. Fowler. "Origin of reverse zoning in branching orthopyroxene and acicular plagioclase in orbicular diorite, Fisher Lake, California." Mineralogical Magazine 66, no. 6 (December 2002): 1003–19. http://dx.doi.org/10.1180/0026461026660073.

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Abstract An orbicular diorite from Fisher Lake, California, USA, contains multi-shelled, magmatic orbicules with branching and budding orthopyroxene crystals as well as feather and acicular plagioclase crystals that are oriented perpendicular to the growth horizon. Plagioclase and orthopyroxene show gradual, reverse compositional zoning along the long axes and normal zoning along the short axes. The reverse zoning varies from An87 to An93 and Mg68 to Mg74 over distances of 4 mm and 8 mm respectively. The close proximity of these two minerals makes it likely that only one mechanism is responsible for the reverse zoning. This zoning can be explained by using relevant temperature-composition diagrams and Gibbs free energy-composition plots. Under sudden and moderate undercoolings, which produce high growth but low nucleation rates, the difference in Gibbs free energy (ΔG) between the crystals and liquid is not initially maximized, i.e. initial compositions are not near-to-equilibrium. This results in crystal compositions that are closer to that of the bulk liquid than expected for crystallization under near-to-equilibrium conditions (i.e. very small ΔT). Over time, and under isothermal crystallization conditions, ΔG gradually increases to a maximum producing crystal compositions that also gradually attain near-to-equilibrium compositions. Subsequent to attaining these conditions, normal zoning occurs perpendicular to the crystal growth axes.
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Yang, Fan, Xiao-Long Huang, Yi-Gang Xu, and Peng-Li He. "Magmatic Processes Associated with Oceanic Crustal Accretion at Slow-spreading Ridges: Evidence from Plagioclase in Mid-ocean Ridge Basalts from the South China Sea." Journal of Petrology 60, no. 6 (May 10, 2019): 1135–62. http://dx.doi.org/10.1093/petrology/egz027.

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Abstract Magmatic processes associated with oceanic crustal accretion at slow-spreading mid-oceanic ridges are less well understood compared with those at fast-spreading ridges. Zoned plagioclase in the basalts might record these magmatic processes as a result of the very slow intra-crystal diffusion of CaAl–NaSi. Plagioclase phenocrysts in plagioclase-phyric basalt from Hole U1433B of International Ocean Discovery Program (IODP) Expedition 349 in the South China Sea show complex zoning patterns (e.g. normal, reverse, oscillatory and patchy). These samples provide a rare opportunity to determine the magma dynamics associated with oceanic crustal accretion at slow-spreading ridges through time. Igneous lithological units in Hole U1433B consist of a series of massive lava flows at the bottom and a thick succession of small pillow lava flows at the top. Most of the plagioclase phenocrysts in the massive lava show core–rim zonation with high-An cores (An ∼85%; in mole fraction; Pl-A) in equilibrium with melts that are more primitive than their host. Some high-An cores of Pl-A phenocrysts contain melt inclusions and are depleted in La, Ce, Y and Ti, but enriched in Sr and Eu; this is interpreted as resulting from dissolution–crystallization processes during reaction of hot melt with pre-existing plagioclase cumulates. In the pillow lavas, most of the plagioclase phenocrysts show normal core–mantle–rim zonation (Pl-B) with An contents decreasing gradually from the core to the mantle to the rim, suggesting extensive magma mixing and differentiation. Reversely zoned plagioclases (Pl-C) are sparsely present throughout the basalts, but mostly occur in the lower part of the drill hole. The cores of euhedral Pl-C phenocrysts are compositionally comparable with the mantles of Pl-B phenocrysts, suggesting that the evolved magma was recharged by a relatively primitive magma. Melt inclusion-bearing Pl-A phenocrysts occur mainly in the massive lava, but rarely in the pillow lava, whereas Pl-B phenocrysts are present dominantly in the pillow lava, which reflects reducing melt–rock interaction and enhanced magma mixing, recharging and differentiation from the bottom to the top of the hole. In addition, the extensive magma mixing and differentiation recorded by Pl-B phenocrysts in the pillow lava require the existence of a melt lens beneath the mid-ocean ridge. Consistently, the plagioclase phenocrysts in the pillow lava mostly lack melt inclusions, corresponding to very weak melt–rock reactions, which indicates that the magma was transported through plagioclase cumulates by channel flow and requires a higher magma supply to the magma conduit. Therefore, the textural and compositional variations of plagioclase phenocrysts in the samples reflect the changes in magma dynamics of the mid-ocean ridge basalt through time with respect to oceanic crustal accretion at slow-spreading ridges. Overall, the oceanic crustal accretion process is sensitive to the magma supply. In the period between two episodes of extension, owing to a low melt supply the primitive melt percolates through and interacts with the mush zone by porous flow, which produces melt inclusion-bearing high-An plagioclase through dissolution–crystallization processes. At the initial stage of a new episode of extension, the melt infiltrates the mush zone and entrains crystal cargoes including melt inclusion-bearing high-An plagioclase. During the major stage of extension, owing to a relatively high melt supply the melt penetrates the mush zone by channel flow and can pool as melt lenses somewhere beneath the dikes; this forms intermediate plagioclases and the reverse zoning of plagioclases by magma mixing, recharging and differentiation in the melt lens. Such magmatic processes might occur repeatedly during the episodic extension that accompanies oceanic crustal accretion at slow-spreading ridges, which enhances the lateral structural heterogeneity of the oceanic crust.
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Russell, J. K., G. T. Nixon, and T. H. Pearce. "Petrographic constraints on modelling the crystallization of basalt magma, Cow Lakes, southeast Oregon." Canadian Journal of Earth Sciences 25, no. 4 (April 1, 1988): 486–94. http://dx.doi.org/10.1139/e88-049.

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Thermodynamic calculations and models of olivine zoning profiles are used to estimate the crystallization history of a basaltic magma from Cow Lakes, southeast Oregon. The lava is an alkali olivine basalt containing olivine and plagioclase phenocrysts and microphenocrysts. The geometry and range of chemical zoning in the olivine phenocrysts have been delineated by laser interference microscopy and electron microprobe analysis. The olivine phenocrysts are characterized by homogeneous cores and rims that exhibit strong, continuous, normal zoning (ΔFo = 7–19 mol%).Thermodynamic modelling has been used to estimate the magmatic crystallization path of the Cow Lakes basalt on the basis of the phenocryst assemblage and mineral compositions. The calculated crystallization path begins at 1290 °C and 0.5 GPa ([Formula: see text]) with equilibrium crystallization of the olivine to 1265 °C. Plagioclase appears at 1225 °C, followed by clinopyroxene at 1205 °C. Intratelluric crystallization was terminated prior to crystallization of the clinopyroxene, which is seen in the groundmass but not as phenocrysts.The thermodynamic modelling provides a means to numerically simulate the zoning patterns in olivine defined by the laser interference microscopy. Simulated and observed zoning patterns both have compositionally flat cores and strongly zoned rims. The extent of zoning observed in the olivine phenocrysts is, however, approximately twice the predicted extent, and it appears that a significant proportion of olivine phenocrysts crystallized during ascent or upon eruption.
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Dissertations / Theses on the topic "Plagioclase zoning"

1

Borges, Melroy R. "Life Cycle of Deccan Trap Magma Chambers: A Crystal Scale Elemental and Strontium Isotopic Investigation." FIU Digital Commons, 2007. http://digitalcommons.fiu.edu/etd/10.

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The Deccan Trap basalts are the remnants of a massive series of lava flows that erupted at the K/T boundary and covered 1-2 million km2 of west-central India. This eruptive event is of global interest because of its possible link to the major mass extinction event, and there is much debate about the duration of this massive volcanic event. In contrast to isotopic or paleomagnetic dating methods, I explore an alternative approach to determine the lifecycle of the magma chambers that supplied the lavas, and extend the concept to obtain a tighter constraint on Deccan’s duration. My method relies on extracting time information from elemental and isotopic diffusion across zone boundary in an individual crystal. I determined elemental and Sr-isotopic variations across abnormally large (2-5 cm) plagioclase crystals from the Thalghat and Kashele “Giant Plagioclase Basalts” from the lowermost Jawhar and Igatpuri Formations respectively in the thickest Western Ghats section near Mumbai. I also obtained bulk rock major, trace and rare earth element chemistry of each lava flow from the two formations. Thalghat flows contain only 12% zoned crystals, with 87Sr/86Sr ratios of 0.7096 in the core and 0.7106 in the rim, separated by a sharp boundary. In contrast, all Kashele crystals have a wider range of 87Sr/86Sr values, with multiple zones. Geochemical modeling of the data suggests that the two types of crystals grew in distinct magmatic environments. Modeling intracrystalline diffusive equilibration between the core and rim of Thalghat crystals led me to obtain a crystal growth rate of 2.03x10-10 cm/s and a residence time of 780 years for the crystals in the magma chamber(s). Employing some assumptions based on field and geochronologic evidence, I extrapolated this residence time to the entire Western Ghats and obtained an estimate of 25,000 – 35,000 years for the duration of Western Ghats volcanism. This gave an eruptive rate of 30 – 40 km3/yr, which is much higher than any presently erupting volcano. This result will remain speculative until a similarly detailed analytical-modeling study is performed for the rest of the Western Ghats formations.
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2

Ustunisik, Gokce K. "Application of Magma Recharge, Plagioclase Zoning, and Crystal Size Distribution (CSD) Theory to Natural Solid-Liquid Equilibria." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1250688404.

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Thomas, Christian. "Insight into the Evolving Composition of Augustine Volcano's Source Magma from a Low-K Dacite." Ohio University Honors Tutorial College / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1536081965599329.

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Rafaranalisoa, Esther. "Donnees nouvelles sur la hibonite (ca a112 o19) de madagascar." Paris 6, 1988. http://www.theses.fr/1988PA066502.

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Apres un historique de la roche a hibonite de madagascar et un resume de son etude par curien et al (1956) ainsi que des autres hibonites : urss, tanzanie et meteoritiques, on presente l'etude petrograhique et chimique des plagioclasites a hibonite qui sont comparees aux sakenites de lacroix. Le chapitre 4 est consacre a la chimie, la structure et l'interpretation des substitutions possibles dans ce mineral;les deux derniers chapitres s'attachent aux etudes des inclusions fluides dans le corindon et des inclusions solides dans les differents mineraux constituant la plagioclasite a hibonite.
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Book chapters on the topic "Plagioclase zoning"

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Pearce, T. H. "Recent Work on Oscillatory Zoning in Plagioclase." In Feldspars and their Reactions, 313–49. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1106-5_8.

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Santo, Alba P., and Rosa Maria Bomparola. "NDIC and EMP Study of Plagioclase Mineral Zoning: An Example from Nea Kameni Lavas." In Modern Developments and Applications in Microbeam Analysis, 219–25. Vienna: Springer Vienna, 1998. http://dx.doi.org/10.1007/978-3-7091-7506-4_31.

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Churikova, Tatiana, Gerhard Wörner, John Eichelberger, and Boris Ivanov. "Minor- and trace element zoning in plagioclase from Kizimen Volcano, Kamchatka: Insights on the magma chamber processes." In Volcanism and Subduction: The Kamchatka Region, 303–23. Washington, D. C.: American Geophysical Union, 2007. http://dx.doi.org/10.1029/172gm22.

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"plagioclase zoning." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1009. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_162229.

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Meyer, P. S., and T. Shibata. "Complex Zoning in Plagioclase Feldspars from ODP Site 648." In Proceedings of the Ocean Drilling Program, 106/109 Scientific Results. Ocean Drilling Program, 1990. http://dx.doi.org/10.2973/odp.proc.sr.106109.135.1990.

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Bryan, W. B., and T. H. Pearce. "Plagioclase Zoning in Selected Lavas from Holes 834B, 839B, and 841B." In Proceedings of the Ocean Drilling Program, 135 Scientific Results. Ocean Drilling Program, 1994. http://dx.doi.org/10.2973/odp.proc.sr.135.132.1994.

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7

Hoshide, Takashi, and Masaaki Obata. "Zoning and resorption of plagioclase in a layered gabbro, as a petrographic indicator of magmatic differentiation." In Sixth Hutton Symposium on The Origin of Granites and Related Rocks: Proceedings of a Symposium held in Stellenbosch, South Africa, 2- 6 July 2007. Geological Society of America, 2010. http://dx.doi.org/10.1130/2010.2472(16).

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Conference papers on the topic "Plagioclase zoning"

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Kenis, Lexi, Shuo Ding, Rita Economos, Celine Vidal, Indyo Pratomo, and Marc-Antoine Longpré. "Understanding Magmatic Processes Prior to the 1257 CE Mount Samalas Eruption Through Plagioclase Zoning Patterns." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.1278.

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Laviada-garmon, Drew, Gary Michelfelder, and Kasey L. Buckley. "PLAGIOCLASE ZONING AS AN INDICATOR OF MAGMA PROCESSES AT OLLAGÜE VOLCANO, ANDEAN CENTRAL VOLCANIC ZONE, CHILE." In Joint 55th Annual North-Central / 55th Annual South-Central Section Meeting - 2021. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021nc-362929.

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Williams, Brianna, Gary Michelfelder, and Drew Laviada-garmon. "PLAGIOCLASE ZONING AS AN INDICATOR OF MAGMA PROCESSES AT SAN PEDRO VOLCANO, CENTRAL VOLCANIC ZONE, CHILE." In Joint 55th Annual North-Central / 55th Annual South-Central Section Meeting - 2021. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021nc-362943.

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