Understanding magma evolution at Campi Flegrei (Campania, Italy) volcanic complex using melt inclusions and phase equilibria

2011 ◽  
Vol 104 (1-2) ◽  
pp. 29-42 ◽  
Author(s):  
Claudia Cannatelli
Keyword(s):  
Phase Equilibria ◽  
Melt Inclusions ◽  
Campi Flegrei ◽  
Volcanic Complex ◽  
Magma Evolution

Pre-eruptive PTX fluid-conditions of the Afyon Volcanic Complex (Western Anatolia, Turkey): Studies of natural rocks and phase equilibria experiments

Lithos ◽  
2021 ◽  
pp. 106297
Author(s):  
G. Deniz Dogan-Kulahci ◽  
Sarah B. Cichy ◽  
Abidin Temel ◽  
Roberta Spallanzani
Keyword(s):  
Phase Equilibria ◽  
Western Anatolia ◽  
Volcanic Complex

scholarly journals Non-metamict betafite from Le Carcarelle (Vico volcanic complex, Italy): occurrence and crystal structure

2004 ◽  
Vol 68 (6) ◽  
pp. 939-950 ◽  
Author(s):  
F. Cámara ◽  
C. T. Williams ◽  
G. Della Ventura ◽  
R. Oberti ◽  
E. Caprilli
Keyword(s):  
Structure Refinement ◽  
Atomic Displacement ◽  
Campi Flegrei ◽  
Volcanic Complex ◽  
Crystal Chemical Formula ◽  
Static Disorder ◽  
Pyrochlore Group ◽  
Atomic Displacement Parameters ◽  
Miarolitic Cavities ◽  
Ti Content

AbstractNon-metamict betafite, a pyrochlore-group mineral with general formula A2−mB2XO6Y(O,OH,F)1−n·pH2O and 2 Ti > Nb+Ta and U > 20% at the A site, has been found at Le Carcarelle, (Latium, Italy). It occurs within miarolitic cavities of a foid-bearing syenitic ejectum enclosed within the pyroclastic formation known as “ignimbrite C”, which belongs to the main effusive phase of the Vico volcanic complex. The host rock is composed of K-feldspar, biotite, augitic clinopyroxene, magnetite and minor sodalite. Electron microprobe analyses gave the following crystal-chemical formula: (Ca1.24Na0.17U0.49REE0.03)Σ=1.93 (Ti1.05Nb0.76Zr0.14Fe0.04Ta0.01)Σ=2.00O6(O,OH). Compared with other occurrences reported in the mineralogical literature, betafite from Le Carcarelle is extremely enriched in U and depleted in Th. Due to its young age of formation (∼150 k.y.), this betafite sample is highly crystalline, thus allowing structure refinement of unheated material. Betafite from Le Carcarelle is cubic Fd3̅m, with a = 10.2637(13) Å, and V = 1081.21(35) Å3, and has a smaller A site (consistent with the higher U content), and a larger and more distorted B site (consistent with the higher Ti content) than calciobetafite from Campi Flegrei, Italy (Mazzi and Munno, 1983). Analysis of the atomic displacement parameters provides evidence for static disorder at the X site.

scholarly journals Magmatic architecture below the Okataina Volcanic Centre, Taupō Volcanic Zone, Aotearoa New Zealand, inferred from basalt geochemistry

2021 ◽  
Author(s):  
Ery Hughes ◽  
Sally Law ◽  
Geoff Kilgour ◽  
Jon Blundy ◽  
Heidy Mader
Keyword(s):  
New Zealand ◽  
Melt Inclusions ◽  
Basaltic Magma ◽  
Taupo Volcanic Zone ◽  
Volcanic Centre ◽  
Volcanic Zone ◽  
Magma Evolution ◽  
Aotearoa New Zealand ◽  
Basalt Geochemistry ◽  
Rhyolitic Volcanism

The Okataina Volcanic Centre (OVC) is the most recently active rhyolitic volcanic centre in the Taupō Volcanic Zone, Aotearoa New Zealand. Although best known for its high rates of explosive rhyolitic volcanism, there are numerous examples of basaltic to basaltic-andesite contributions to OVC eruptions, ranging from minor involvement of basalt in rhyolitic eruptions to the exclusively basaltic 1886 C.E. Plinian eruption of Tarawera. To explore the basaltic component supplying this dominantly rhyolitic area, we analyse the textures and compositions (minerals and melt inclusions) of four basaltic eruptions within the OVC that have similar whole rock chemistry, namely: Terrace Rd, Rotomakariri, Rotokawau, and Tarawera. Data from these basaltic deposits provide constraints on the conditions of magma evolution and ascent in the crust prior to eruption, revealing that at least five different magma types (two basalts, two dacites, one rhyolite) are sampled during basaltic eruptions. The most abundant basaltic magma type is generated by cooling-induced crystallisation of a common, oxidised, basaltic melt at various depths throughout the crust. The volatile content of this melt was increased by protracted fluid-undersaturated crystallisation. All eruptions display abundant evidence for syn-eruptive mixing of the different magma types. Rotomakariri, consisting of a mafic crystal cargo mixed into a dacitic magma is the most extreme example of this process. Despite similar bulk compositions, comparable to other basaltic deposits in the region, these four OVC eruptions are texturally distinct as a consequence of their wide variation in eruption style.

Quartz crystals in Toba rhyolites show textures symptomatic of rapid crystallization

2020 ◽  
Vol 105 (2) ◽  
pp. 194-226
Author(s):  
Olivia Barbee ◽  
Craig Chesner ◽  
Chad Deering
Keyword(s):  
Melt Inclusions ◽  
Experimental Studies ◽  
Magma Evolution ◽  
Quartz Crystals ◽  
Rapid Crystallization ◽  
Morphological Transitions ◽  
Quantitative Analyses ◽  
Growth Transitions ◽  
Causal Sequence ◽  
Structural Instabilities

Abstract Textural and chemical heterogeneities in igneous quartz crystals preserve unique records of silicic magma evolution, yet their origins and applications are controversial. To improve our understanding of quartz textures and their formation, we examine those in crystal-laden rhyolites produced by the 74 ka Toba supereruption (>2800 km3) and its post-caldera extrusions. Quartz crystals in these deposits can reach unusually large sizes (10–20 mm) and are rife with imperfections and disequilibrium features, including embayments, melt inclusions, titanomagnetite and apatite inclusions, spongy morphologies, hollow faces, subgrain boundaries, multiple growth centers, and Ti-enriched arborescent zoning. Using a combination of qualitative and quantitative analyses (petrography, CL, EBSD, X-ray CT, LA-ICPMS), we determine that those textures commonly thought to signify crystal resorption, crystal deformation, synneusis, or fluctuating P–T conditions are here a consequence of rapid disequilibrium crystal growth. Most importantly, we discover that an overarching process of disequilibrium crystallization is manifested among these crystal features. We propose a model whereby early skeletal to dendritic quartz growth creates a causal sequence of textures derived from lattice mistakes that then proliferate during subsequent stages of slower polyhedral growth. In a reversed sequence, the same structural instabilities and defects form when slow polyhedral growth transitions late to fast skeletal-dendritic growth. Such morphological transitions result in texture interdependencies that become recorded in the textural-chemical stratigraphy of quartz, which may be unique to each crystal. Similar findings in petrologic experimental studies allow us to trace the textural network back to strong degrees of undercooling and supersaturation in the host melt, conditions likely introduced by dynamic magmatic processes acting on short geologic timescales. Because the textural network can manifest in single crystals, the overall morphology and chemistry of erupted quartz can reflect not only its last but its earliest growth behavior in the melt. Thus, our findings imply that thermodynamic disequilibrium crystallization can account for primary textural and chemical heterogeneities preserved in igneous quartz and may impact the application of quartz as a petrologic tool.

Rhyolite magma evolution recorded in isotope and trace element composition of zircon from Halle Volcanic Complex

Lithos ◽  
2016 ◽  
Vol 248-251 ◽  
pp. 402-417 ◽  
Author(s):  
E. Słodczyk ◽  
A. Pietranik ◽  
C. Breitkreuz ◽  
C.M. Fanning ◽  
R. Anczkiewicz ◽  
...  
Keyword(s):  
Trace Element ◽  
Trace Element Composition ◽  
Element Composition ◽  
Volcanic Complex ◽  
Magma Evolution ◽  
Rhyolite Magma

Evidences for Bimodal volcanism on 4-Vesta Asteroid from impact-melt clast

2020 ◽  
Author(s):  
Dwijesh Ray ◽  
Sambhunath Ghosh
Keyword(s):  
Melt Inclusions ◽  
Bulk Composition ◽  
Parent Body ◽  
Total Iron ◽  
Volcanic Complex ◽  
Element Geochemistry ◽  
Silicic Volcanism ◽  
Impact Melt ◽  
Acid Volcanism ◽  
The Impact

<p>Silicic / acid volcanism has not been widely described either on Moon, Mars or in Asteroid 4 Vesta. The occurrence of sialic crustal rocks on the lunar surface is extremely limited. Reports on silicic (non-mare) volcanic rocks on Moon is found to be associated in Compton-Belkovich volcanic complex, Hansteen Alpha volcanic crater, Lassell massif, Gruithuisen domes and ejecta of Aristarchus crater (Clegg-Watkins et al., 2017). The occurrence of several volcanic constructs (e.g. collapse features, domes) and volatile-rich pyroclastics in association with silicic rocks further emphasize existence of viscous magmas on Moon. A localized occurrence of silicic volcanism on Mars is also envisaged by the presence of tridymite in mudstone of Gale crater (Morris et al., 2016). However, the exact formation mechanism of silicic volcanism on Moon, Mars or even in 4-Vesta has been largely hindered due to lack of silicic meteorite samples or mission-returned samples.</p> <p>The HED (Howardite, Eucrite, Diogenite) meteorites is considered to have originated from a common parent body Asteroid 4-Vesta. Recent Dawn mission also attempts to validate its geologic context and formulate a possible HED-Vesta connection (McSween et al., 2013). Based on Dawn findings, Vesta’s surface appears to be similar to a mixture of basaltic eucrite and diogenite resembling a more complex breccia howardite (De Sanctis et al., 2012; Prettyman et al., 2012). A variety of clasts are apparently common in howardite. Here, we report the petrography and major element geochemistry of a new impact-melt clast from Lohawat howardite. Our results show that the clast composition is unique and unlikely to be explained by typical impact melting of HED mafic lithologies. One of the impact melts (~20µ across) hosted in ferroaugite (Wo<sub>42</sub>En<sub>2.7</sub>Fs<sub>55.3</sub>) clast substantially differ in composition from the other impact-melt (~50µ across) hosted in ilmenite clast, specially in terms of SiO<sub>2</sub> wt%, CaO wt%, K<sub>2</sub>O wt% and K<sub>2</sub>O / (K<sub>2</sub>O + Na<sub>2</sub>O) ratio. Moreover, one appears nearly homogeneous in contrast to evolved nature with limited heterogeneity as compared to other. Both the melts are oblong-shaped, smooth textured with sharp outline and embedded in the host monomict mineral clast of different composition belonging to possible parent of cumulate eucrite.</p> <p>The average bulk composition of Lohawat is consistent with basaltic crusts (SiO<sub>2</sub> ~50.3-51.8 wt%, Al<sub>2</sub>O<sub>3</sub> ~3.5-8.2 wt%, total iron-magnesia ~31.2-38.0 wt%, CaO ~2.2-7.6 wt%) (Chattopadhyay et al. 1998; Sisodia et al. 2001; Ghosh, 2011). Supplement to basaltic volcanism, we report for the first time the incipient acid volcanism in a HED meteorite based on two impact melt inclusions of nearly rhyolitic composition (SiO<sub>2</sub> ~76-79.5 wt%, Al<sub>2</sub>O<sub>3 </sub>~11.4 - 12.8 wt%, total alkali ~3 - 8 wt% with K<sub>2</sub>O/ (Na<sub>2</sub>O + K<sub>2</sub>O) ~0.21-0.95, CaO ~ 0.8 - 4.67wt% and low total iron-magnesia ~1-2 wt%). Our study thus reinforces to conceive the idea that some rhyolitic crusts formed due to differentiation of mafic magma were exposed on Vesta and heterogeneity of Vestan surface is definitely different from one as previously thought.</p> <p>References: Clegg-Watkins, R.N. et al. 2016, Icarus 285:169-184. Morris, R.V. et al. 2016, 113:7071-7076. McSween, H.Y. et al. 2013, MAPS 48:2090-2104. De Sanctis, M.C. et al. 2012, Science 336:697-700. Prettyman, T.H. et al. 2012, Science 338:242-246. Chattopadhyay, B. et al. 1998. JGSI 51:171-174. Sisodia, M.S. et al. 2001 MAPS 36:1457-1466. Ghosh, S. IJG 65:251-264.</p>

scholarly journals The July-August 2000 seismic swarms at Campi Flegrei Volcanic Complex, Italy

2001 ◽  
Vol 28 (13) ◽  
pp. 2525-2528 ◽  
Author(s):  
Gilberto Saccorotti ◽  
Francesca Bianco ◽  
Mario Castellano ◽  
Edoardo Del Pezzo
Keyword(s):  
Campi Flegrei ◽  
Volcanic Complex ◽  
Seismic Swarms

scholarly journals Geochemistry of melt inclusions from the Fondo Riccio and Minopoli 1 eruptions at Campi Flegrei (Italy)

2007 ◽  
Vol 237 (3-4) ◽  
pp. 418-432 ◽  
Author(s):  
C. Cannatelli ◽  
A. Lima ◽  
R.J. Bodnar ◽  
B. De Vivo ◽  
J.D. Webster ◽  
...  
Keyword(s):  
Melt Inclusions ◽  
Campi Flegrei

scholarly journals Plagioclase Hosted Melt Inclusion in Hypabyssal Rocks in Torud-Ahmad Abad Magmatic Belt

2019 ◽  
Vol 55 (1) ◽  
pp. 158
Author(s):  
Fazilat Yousefi ◽  
Lambrini Papadopoulou ◽  
Mahmoud Sadeghian ◽  
Christina Wanhainen ◽  
Glenn Bark
Keyword(s):  
Melt Inclusions ◽  
Melt Inclusion ◽  
Magma Mixing ◽  
Volcanic Rocks ◽  
Crustal Contamination ◽  
Sem Analysis ◽  
Magma Evolution ◽  
Compositional Evolution ◽  
Growth Zones ◽  
First Time

This study investigates for the first time melt inclusions (MI) that are found within fundamental minerals of subvolcanic rocks in Torud-Ahmad Abad magmatic belt. The Torud-Ahmad Abad magmatic belt is situated in south-southeast of Shahrood and belongs to the northern part of central Iran structural zone. Melt inclusions represent liquids that were trapped along growth zones (primary) or healed fractures of mineral phases, which crystallized from the silicate liquid as it cooled. Based on SEM analysis of these melt inclusions, their compositions are dacite, andesite and basaltic andesite. Thus, with the use of melt inclusions in the volcanic rocks of Torud-Ahmad Abad magmatic belt, we attempt to show the compositional evolution and origin of magma. The effective factors on magma evolution are magma mixing, fractional crystallization and crustal contamination.

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