Cooling and crystallization recorded in trachytic enclaves hosted in pantelleritic magmas (Pantelleria, Italy): Implications for pantellerite petrogenesis

Silvio Giuseppe Rotolo, Silvio G. Rotolo, Patrizia Landi

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4 Citazioni (Scopus)

Abstract

one of the most recent eruptive events at Pantelleria (~6 ka). Enclaves range from mm-sized fragments to dm-sized blocks with spheroidal to amoeboid shapes and characteristic globular surfaces; they are crystal-rich with ~30 vol% large anorthoclase, less abundant Fe-rich olivine, clinopyroxene and Fe–Ti oxides. Vesicles ranging from a fewmmto 1–2 cmin size are distributed throughout the enclave and are commonly filledwith microlitefree vesicular glass. The groundmass presents spectacular textures, including fine to coarse spherulites and hopper and skeletal microlites (mostly anorthoclase) with 10–35 vol% residual glass and 10–15 vol% small vesicles (b50 μm to 200 μm). Residual glass has a pantelleritic composition with Na + K/Al N 2. Accordingly, the microlite composition is close to that of the host pantellerite. These textures were acquired during a magma mixing event prior to the eruption: (i) a vapor-saturated comenditic trachyte magma intruded the shallower, cooler pantellerite magma body, triggering a first degassing event (first boiling) and rapid crystallization with a high degree of undercooling (ΔT = 100–150 °C); (ii) vapor exsolution induced by rapid crystallization (second boiling) produced the microvesicular groundmass; and (iii) vapor pressure forced the residual pantelleritic liquid to migrate into the large vesicles and/or outside the enclaves. Based on this interpretation, these enclaves can be used as a natural laboratory for identifying the chemical and physical processes driving the evolution of silicic magmas at Pantelleria. In particular, they can be used to assess whether pantellerite melts can be obtained from comenditic trachytes after extensive crystallization followed by gas-driven filter-pressing and consequent
Lingua originaleEnglish
pagine (da-a)169-179
Numero di pagine10
RivistaJournal of Volcanology and Geothermal Research
Volume301
Stato di pubblicazionePublished - 2015

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petrogenesis
enclave
Crystallization
Italy
magma
crystallization
glass
vesicle
Cooling
cooling
Glass
boiling
Boiling liquids
textures
Textures
texture
trachyte
spherulite
spherulites
Undercooling

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

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@article{d3a567100e5441f0a7701c585e13d6cb,
title = "Cooling and crystallization recorded in trachytic enclaves hosted in pantelleritic magmas (Pantelleria, Italy): Implications for pantellerite petrogenesis",
abstract = "one of the most recent eruptive events at Pantelleria (~6 ka). Enclaves range from mm-sized fragments to dm-sized blocks with spheroidal to amoeboid shapes and characteristic globular surfaces; they are crystal-rich with ~30 vol{\%} large anorthoclase, less abundant Fe-rich olivine, clinopyroxene and Fe–Ti oxides. Vesicles ranging from a fewmmto 1–2 cmin size are distributed throughout the enclave and are commonly filledwith microlitefree vesicular glass. The groundmass presents spectacular textures, including fine to coarse spherulites and hopper and skeletal microlites (mostly anorthoclase) with 10–35 vol{\%} residual glass and 10–15 vol{\%} small vesicles (b50 μm to 200 μm). Residual glass has a pantelleritic composition with Na + K/Al N 2. Accordingly, the microlite composition is close to that of the host pantellerite. These textures were acquired during a magma mixing event prior to the eruption: (i) a vapor-saturated comenditic trachyte magma intruded the shallower, cooler pantellerite magma body, triggering a first degassing event (first boiling) and rapid crystallization with a high degree of undercooling (ΔT = 100–150 °C); (ii) vapor exsolution induced by rapid crystallization (second boiling) produced the microvesicular groundmass; and (iii) vapor pressure forced the residual pantelleritic liquid to migrate into the large vesicles and/or outside the enclaves. Based on this interpretation, these enclaves can be used as a natural laboratory for identifying the chemical and physical processes driving the evolution of silicic magmas at Pantelleria. In particular, they can be used to assess whether pantellerite melts can be obtained from comenditic trachytes after extensive crystallization followed by gas-driven filter-pressing and consequent",
author = "Rotolo, {Silvio Giuseppe} and Rotolo, {Silvio G.} and Patrizia Landi",
year = "2015",
language = "English",
volume = "301",
pages = "169--179",
journal = "Journal of Volcanology and Geothermal Research",
issn = "0377-0273",
publisher = "Elsevier",

}

TY - JOUR

T1 - Cooling and crystallization recorded in trachytic enclaves hosted in pantelleritic magmas (Pantelleria, Italy): Implications for pantellerite petrogenesis

AU - Rotolo, Silvio Giuseppe

AU - Rotolo, Silvio G.

AU - Landi, Patrizia

PY - 2015

Y1 - 2015

N2 - one of the most recent eruptive events at Pantelleria (~6 ka). Enclaves range from mm-sized fragments to dm-sized blocks with spheroidal to amoeboid shapes and characteristic globular surfaces; they are crystal-rich with ~30 vol% large anorthoclase, less abundant Fe-rich olivine, clinopyroxene and Fe–Ti oxides. Vesicles ranging from a fewmmto 1–2 cmin size are distributed throughout the enclave and are commonly filledwith microlitefree vesicular glass. The groundmass presents spectacular textures, including fine to coarse spherulites and hopper and skeletal microlites (mostly anorthoclase) with 10–35 vol% residual glass and 10–15 vol% small vesicles (b50 μm to 200 μm). Residual glass has a pantelleritic composition with Na + K/Al N 2. Accordingly, the microlite composition is close to that of the host pantellerite. These textures were acquired during a magma mixing event prior to the eruption: (i) a vapor-saturated comenditic trachyte magma intruded the shallower, cooler pantellerite magma body, triggering a first degassing event (first boiling) and rapid crystallization with a high degree of undercooling (ΔT = 100–150 °C); (ii) vapor exsolution induced by rapid crystallization (second boiling) produced the microvesicular groundmass; and (iii) vapor pressure forced the residual pantelleritic liquid to migrate into the large vesicles and/or outside the enclaves. Based on this interpretation, these enclaves can be used as a natural laboratory for identifying the chemical and physical processes driving the evolution of silicic magmas at Pantelleria. In particular, they can be used to assess whether pantellerite melts can be obtained from comenditic trachytes after extensive crystallization followed by gas-driven filter-pressing and consequent

AB - one of the most recent eruptive events at Pantelleria (~6 ka). Enclaves range from mm-sized fragments to dm-sized blocks with spheroidal to amoeboid shapes and characteristic globular surfaces; they are crystal-rich with ~30 vol% large anorthoclase, less abundant Fe-rich olivine, clinopyroxene and Fe–Ti oxides. Vesicles ranging from a fewmmto 1–2 cmin size are distributed throughout the enclave and are commonly filledwith microlitefree vesicular glass. The groundmass presents spectacular textures, including fine to coarse spherulites and hopper and skeletal microlites (mostly anorthoclase) with 10–35 vol% residual glass and 10–15 vol% small vesicles (b50 μm to 200 μm). Residual glass has a pantelleritic composition with Na + K/Al N 2. Accordingly, the microlite composition is close to that of the host pantellerite. These textures were acquired during a magma mixing event prior to the eruption: (i) a vapor-saturated comenditic trachyte magma intruded the shallower, cooler pantellerite magma body, triggering a first degassing event (first boiling) and rapid crystallization with a high degree of undercooling (ΔT = 100–150 °C); (ii) vapor exsolution induced by rapid crystallization (second boiling) produced the microvesicular groundmass; and (iii) vapor pressure forced the residual pantelleritic liquid to migrate into the large vesicles and/or outside the enclaves. Based on this interpretation, these enclaves can be used as a natural laboratory for identifying the chemical and physical processes driving the evolution of silicic magmas at Pantelleria. In particular, they can be used to assess whether pantellerite melts can be obtained from comenditic trachytes after extensive crystallization followed by gas-driven filter-pressing and consequent

UR - http://hdl.handle.net/10447/186574

M3 - Article

VL - 301

SP - 169

EP - 179

JO - Journal of Volcanology and Geothermal Research

JF - Journal of Volcanology and Geothermal Research

SN - 0377-0273

ER -