Geochemistry and volatile content of magmas feeding explosive eruptions at Telica volcano (Nicaragua)

Silvio Giuseppe Rotolo, Philippe Robidoux, Alessandro Aiuppa, Robidoux, Rotolo, Aiuppa, Hauri, Giovanni Lanzo

Risultato della ricerca: Article

2 Citazioni (Scopus)

Abstract

Telica volcano, in north-west Nicaragua, is a young stratovolcano of intermediate magma composition producingfrequent Vulcanian to phreatic explosive eruptions. The Telica stratigraphic record also includes examples of(pre)historic sub-Plinian activity. To refine our knowledge of this very active volcano, weanalyzedmajor elementcomposition and volatile content of melt inclusions fromsomestratigraphically significant Telica tephra deposits.These include: (1) the Scoria Telica Superior (STS) deposit (2000 to 200 years Before Present; Volcanic ExplosiveIndex, VEI, of 2–3) and (2) pyroclasts from the post-1970s eruptive cycle (1982; 2011). Based on measurementswith nanoscale secondary ion mass spectrometry, olivine-hosted (forsterite [Fo] N 80) glass inclusions fall into 2distinct clusters: a group of H2O-rich (1.8–5.2 wt%) inclusions, similar to those of nearby Cerro Negro volcano,and a second group of CO2-rich (360–1700 μg/g CO2) inclusions (Nejapa, Granada). Model calculations showthat CO2 dominates the equilibrium magmatic vapor phase in the majority of the primitive inclusions (XCO2 N0.62–0.95). CO2, sulfur (generally b2000 μg/g) and H2O are lost to the vapor phase during deep decompression(P N 400 MPa) and early crystallization of magmas. Chlorine exhibits a wide concentration range (400–2300μg/g) in primitive olivine-entrapped melts (likely suggesting variable source heterogeneity) and is typicallyenriched in the most differentiated melts (1000–3000 μg/g). Primitive, volatile-rich olivine-hosted melt inclusions(entrapment pressures, 5–15 km depth) are exclusively found in the largest-scale Telica eruptions (exemplifiedby STS in our study). These eruptions are thus tentatively explained as due to injection of deep CO2-richmafic magma into the shallow crustal plumbing system. More recent (post-1970), milder (VEI 1–2) eruptions,instead, do only exhibit evidence for low-pressure (P b 50–60 MPa), volatile-poor (H2O b 0.3–1.7 wt%; CO2b 23–308 μg/g) magmatic conditions. These are manifested as andesitic magmas, recording multiple magmamixing events, in pyroxene inclusions.Wepropose that post-1970s eruptions are possibly related to the high viscosityof resident magma in shallow plumbing system (b2.4 km), due to crystallization and degassing.
Lingua originaleEnglish
pagine (da-a)131-148
Numero di pagine18
RivistaDefault journal
Volume341
Stato di pubblicazionePublished - 2017

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Nicaragua
Volcanoes
Geochemistry
geochemistry
volcanoes
volcanic eruptions
explosive
volcano
volcanic eruption
inclusions
olivine
melt inclusion
magma
Plumbing
crystallization
Crystallization
melt
stratovolcano
forsterite
Deposits

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

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Geochemistry and volatile content of magmas feeding explosive eruptions at Telica volcano (Nicaragua). / Rotolo, Silvio Giuseppe; Robidoux, Philippe; Aiuppa, Alessandro; Robidoux; Rotolo; Aiuppa; Hauri; Lanzo, Giovanni.

In: Default journal, Vol. 341, 2017, pag. 131-148.

Risultato della ricerca: Article

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title = "Geochemistry and volatile content of magmas feeding explosive eruptions at Telica volcano (Nicaragua)",
abstract = "Telica volcano, in north-west Nicaragua, is a young stratovolcano of intermediate magma composition producingfrequent Vulcanian to phreatic explosive eruptions. The Telica stratigraphic record also includes examples of(pre)historic sub-Plinian activity. To refine our knowledge of this very active volcano, weanalyzedmajor elementcomposition and volatile content of melt inclusions fromsomestratigraphically significant Telica tephra deposits.These include: (1) the Scoria Telica Superior (STS) deposit (2000 to 200 years Before Present; Volcanic ExplosiveIndex, VEI, of 2–3) and (2) pyroclasts from the post-1970s eruptive cycle (1982; 2011). Based on measurementswith nanoscale secondary ion mass spectrometry, olivine-hosted (forsterite [Fo] N 80) glass inclusions fall into 2distinct clusters: a group of H2O-rich (1.8–5.2 wt{\%}) inclusions, similar to those of nearby Cerro Negro volcano,and a second group of CO2-rich (360–1700 μg/g CO2) inclusions (Nejapa, Granada). Model calculations showthat CO2 dominates the equilibrium magmatic vapor phase in the majority of the primitive inclusions (XCO2 N0.62–0.95). CO2, sulfur (generally b2000 μg/g) and H2O are lost to the vapor phase during deep decompression(P N 400 MPa) and early crystallization of magmas. Chlorine exhibits a wide concentration range (400–2300μg/g) in primitive olivine-entrapped melts (likely suggesting variable source heterogeneity) and is typicallyenriched in the most differentiated melts (1000–3000 μg/g). Primitive, volatile-rich olivine-hosted melt inclusions(entrapment pressures, 5–15 km depth) are exclusively found in the largest-scale Telica eruptions (exemplifiedby STS in our study). These eruptions are thus tentatively explained as due to injection of deep CO2-richmafic magma into the shallow crustal plumbing system. More recent (post-1970), milder (VEI 1–2) eruptions,instead, do only exhibit evidence for low-pressure (P b 50–60 MPa), volatile-poor (H2O b 0.3–1.7 wt{\%}; CO2b 23–308 μg/g) magmatic conditions. These are manifested as andesitic magmas, recording multiple magmamixing events, in pyroxene inclusions.Wepropose that post-1970s eruptions are possibly related to the high viscosityof resident magma in shallow plumbing system (b2.4 km), due to crystallization and degassing.",
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T1 - Geochemistry and volatile content of magmas feeding explosive eruptions at Telica volcano (Nicaragua)

AU - Rotolo, Silvio Giuseppe

AU - Robidoux, Philippe

AU - Aiuppa, Alessandro

AU - Robidoux, null

AU - Rotolo, null

AU - Aiuppa, null

AU - Hauri, null

AU - Lanzo, Giovanni

PY - 2017

Y1 - 2017

N2 - Telica volcano, in north-west Nicaragua, is a young stratovolcano of intermediate magma composition producingfrequent Vulcanian to phreatic explosive eruptions. The Telica stratigraphic record also includes examples of(pre)historic sub-Plinian activity. To refine our knowledge of this very active volcano, weanalyzedmajor elementcomposition and volatile content of melt inclusions fromsomestratigraphically significant Telica tephra deposits.These include: (1) the Scoria Telica Superior (STS) deposit (2000 to 200 years Before Present; Volcanic ExplosiveIndex, VEI, of 2–3) and (2) pyroclasts from the post-1970s eruptive cycle (1982; 2011). Based on measurementswith nanoscale secondary ion mass spectrometry, olivine-hosted (forsterite [Fo] N 80) glass inclusions fall into 2distinct clusters: a group of H2O-rich (1.8–5.2 wt%) inclusions, similar to those of nearby Cerro Negro volcano,and a second group of CO2-rich (360–1700 μg/g CO2) inclusions (Nejapa, Granada). Model calculations showthat CO2 dominates the equilibrium magmatic vapor phase in the majority of the primitive inclusions (XCO2 N0.62–0.95). CO2, sulfur (generally b2000 μg/g) and H2O are lost to the vapor phase during deep decompression(P N 400 MPa) and early crystallization of magmas. Chlorine exhibits a wide concentration range (400–2300μg/g) in primitive olivine-entrapped melts (likely suggesting variable source heterogeneity) and is typicallyenriched in the most differentiated melts (1000–3000 μg/g). Primitive, volatile-rich olivine-hosted melt inclusions(entrapment pressures, 5–15 km depth) are exclusively found in the largest-scale Telica eruptions (exemplifiedby STS in our study). These eruptions are thus tentatively explained as due to injection of deep CO2-richmafic magma into the shallow crustal plumbing system. More recent (post-1970), milder (VEI 1–2) eruptions,instead, do only exhibit evidence for low-pressure (P b 50–60 MPa), volatile-poor (H2O b 0.3–1.7 wt%; CO2b 23–308 μg/g) magmatic conditions. These are manifested as andesitic magmas, recording multiple magmamixing events, in pyroxene inclusions.Wepropose that post-1970s eruptions are possibly related to the high viscosityof resident magma in shallow plumbing system (b2.4 km), due to crystallization and degassing.

AB - Telica volcano, in north-west Nicaragua, is a young stratovolcano of intermediate magma composition producingfrequent Vulcanian to phreatic explosive eruptions. The Telica stratigraphic record also includes examples of(pre)historic sub-Plinian activity. To refine our knowledge of this very active volcano, weanalyzedmajor elementcomposition and volatile content of melt inclusions fromsomestratigraphically significant Telica tephra deposits.These include: (1) the Scoria Telica Superior (STS) deposit (2000 to 200 years Before Present; Volcanic ExplosiveIndex, VEI, of 2–3) and (2) pyroclasts from the post-1970s eruptive cycle (1982; 2011). Based on measurementswith nanoscale secondary ion mass spectrometry, olivine-hosted (forsterite [Fo] N 80) glass inclusions fall into 2distinct clusters: a group of H2O-rich (1.8–5.2 wt%) inclusions, similar to those of nearby Cerro Negro volcano,and a second group of CO2-rich (360–1700 μg/g CO2) inclusions (Nejapa, Granada). Model calculations showthat CO2 dominates the equilibrium magmatic vapor phase in the majority of the primitive inclusions (XCO2 N0.62–0.95). CO2, sulfur (generally b2000 μg/g) and H2O are lost to the vapor phase during deep decompression(P N 400 MPa) and early crystallization of magmas. Chlorine exhibits a wide concentration range (400–2300μg/g) in primitive olivine-entrapped melts (likely suggesting variable source heterogeneity) and is typicallyenriched in the most differentiated melts (1000–3000 μg/g). Primitive, volatile-rich olivine-hosted melt inclusions(entrapment pressures, 5–15 km depth) are exclusively found in the largest-scale Telica eruptions (exemplifiedby STS in our study). These eruptions are thus tentatively explained as due to injection of deep CO2-richmafic magma into the shallow crustal plumbing system. More recent (post-1970), milder (VEI 1–2) eruptions,instead, do only exhibit evidence for low-pressure (P b 50–60 MPa), volatile-poor (H2O b 0.3–1.7 wt%; CO2b 23–308 μg/g) magmatic conditions. These are manifested as andesitic magmas, recording multiple magmamixing events, in pyroxene inclusions.Wepropose that post-1970s eruptions are possibly related to the high viscosityof resident magma in shallow plumbing system (b2.4 km), due to crystallization and degassing.

UR - http://hdl.handle.net/10447/240841

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