Presentation_1_Isotopic and Petrologic Investigation, and a Thermomechanical Model of Genesis of Large-Volume Rhyolites in Arc Environments: Karymshina Volcanic Complex, Kamchatka, Russia.pptx
The Kamchatka Peninsula of eastern Russia is currently one of the most volcanically active areas on Earth where a combination of >8 cm/yr subduction convergence rate and thick continental crust generates large silicic magma chambers, reflected by abundant large calderas and caldera complexes. Thi...
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ftfrontimediafig:oai:figshare.com:article/7622555 2023-05-15T16:58:53+02:00 Presentation_1_Isotopic and Petrologic Investigation, and a Thermomechanical Model of Genesis of Large-Volume Rhyolites in Arc Environments: Karymshina Volcanic Complex, Kamchatka, Russia.pptx Ilya N. Bindeman Vladimir L. Leonov Dylan P. Colón Aleksey N. Rogozin Niccole Shipley Brian Jicha Matthew W. Loewen Taras V. Gerya 2019-01-24T04:27:59Z https://doi.org/10.3389/feart.2018.00238.s002 https://figshare.com/articles/Presentation_1_Isotopic_and_Petrologic_Investigation_and_a_Thermomechanical_Model_of_Genesis_of_Large-Volume_Rhyolites_in_Arc_Environments_Karymshina_Volcanic_Complex_Kamchatka_Russia_pptx/7622555 unknown doi:10.3389/feart.2018.00238.s002 https://figshare.com/articles/Presentation_1_Isotopic_and_Petrologic_Investigation_and_a_Thermomechanical_Model_of_Genesis_of_Large-Volume_Rhyolites_in_Arc_Environments_Karymshina_Volcanic_Complex_Kamchatka_Russia_pptx/7622555 CC BY 4.0 CC-BY Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change high-silica rhyolites oxygen isotopes (18O) thermomechanical modeling caldera Ar-Ar dating Sr isotopes Nd isotopes Kamchatka (Russia) Text Presentation 2019 ftfrontimediafig https://doi.org/10.3389/feart.2018.00238.s002 2019-01-30T23:58:58Z The Kamchatka Peninsula of eastern Russia is currently one of the most volcanically active areas on Earth where a combination of >8 cm/yr subduction convergence rate and thick continental crust generates large silicic magma chambers, reflected by abundant large calderas and caldera complexes. This study examines the largest center of silicic 4-0.5 Ma Karymshina Volcanic Complex, which includes the 25 × 15 km Karymshina caldera, the largest in Kamchatka. A series of rhyolitic tuff eruptions at 4 Ma were followed by the main eruption at 1.78 Ma and produced an estimated 800 km 3 of rhyolitic ignimbrites followed by high-silica rhyolitic post-caldera extrusions. The postcaldera domes trace the 1.78 Ma right fracture and form a continuous compositional series with ignimbrites. We here present results of a geologic, petrologic, and isotopic study of the Karymshina eruptive complex, and present new Ar-Ar ages, and isotopic values of rocks for the oldest pre- 1.78 Ma caldera ignimbrites and intrusions, which include a diversity of compositions from basalts to rhyolites. Temporal trends in δ 18 O, 87 Sr/ 86 Sr, and 144 Nd/ 143 Nd indicate values comparable to neighboring volcanoes, increase in homogeneity, and temporal increase in mantle-derived Sr and Nd with increasing differentiation over the last 4 million years. Data are consistent with a batholithic scale magma chamber formed by primarily fractional crystallization of mantle derived composition and assimilation of Cretaceous and younger crust, driven by basaltic volcanism and mantle delaminations. All rocks have 35–45% quartz, plagioclase, biotite, and amphibole phenocrysts. Rhyolite-MELTS crystallization models favor shallow (2 kbar) differentiation conditions and varying quantities of assimilated amphibolite partial melt and hydrothermally-altered silicic rock. Thermomechanical modeling with a typical 0.001 km 3 /yr eruption rate of hydrous basalt into a 38 km Kamchatkan arc crust produces two magma bodies, one near the Moho and the other engulfing the entire ... Conference Object Kamchatka Kamchatka Peninsula Frontiers: Figshare Kamchatka Peninsula ENVELOPE(160.000,160.000,56.000,56.000) Karymshina ENVELOPE(158.291,158.291,52.953,52.953) |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change high-silica rhyolites oxygen isotopes (18O) thermomechanical modeling caldera Ar-Ar dating Sr isotopes Nd isotopes Kamchatka (Russia) |
spellingShingle |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change high-silica rhyolites oxygen isotopes (18O) thermomechanical modeling caldera Ar-Ar dating Sr isotopes Nd isotopes Kamchatka (Russia) Ilya N. Bindeman Vladimir L. Leonov Dylan P. Colón Aleksey N. Rogozin Niccole Shipley Brian Jicha Matthew W. Loewen Taras V. Gerya Presentation_1_Isotopic and Petrologic Investigation, and a Thermomechanical Model of Genesis of Large-Volume Rhyolites in Arc Environments: Karymshina Volcanic Complex, Kamchatka, Russia.pptx |
topic_facet |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change high-silica rhyolites oxygen isotopes (18O) thermomechanical modeling caldera Ar-Ar dating Sr isotopes Nd isotopes Kamchatka (Russia) |
description |
The Kamchatka Peninsula of eastern Russia is currently one of the most volcanically active areas on Earth where a combination of >8 cm/yr subduction convergence rate and thick continental crust generates large silicic magma chambers, reflected by abundant large calderas and caldera complexes. This study examines the largest center of silicic 4-0.5 Ma Karymshina Volcanic Complex, which includes the 25 × 15 km Karymshina caldera, the largest in Kamchatka. A series of rhyolitic tuff eruptions at 4 Ma were followed by the main eruption at 1.78 Ma and produced an estimated 800 km 3 of rhyolitic ignimbrites followed by high-silica rhyolitic post-caldera extrusions. The postcaldera domes trace the 1.78 Ma right fracture and form a continuous compositional series with ignimbrites. We here present results of a geologic, petrologic, and isotopic study of the Karymshina eruptive complex, and present new Ar-Ar ages, and isotopic values of rocks for the oldest pre- 1.78 Ma caldera ignimbrites and intrusions, which include a diversity of compositions from basalts to rhyolites. Temporal trends in δ 18 O, 87 Sr/ 86 Sr, and 144 Nd/ 143 Nd indicate values comparable to neighboring volcanoes, increase in homogeneity, and temporal increase in mantle-derived Sr and Nd with increasing differentiation over the last 4 million years. Data are consistent with a batholithic scale magma chamber formed by primarily fractional crystallization of mantle derived composition and assimilation of Cretaceous and younger crust, driven by basaltic volcanism and mantle delaminations. All rocks have 35–45% quartz, plagioclase, biotite, and amphibole phenocrysts. Rhyolite-MELTS crystallization models favor shallow (2 kbar) differentiation conditions and varying quantities of assimilated amphibolite partial melt and hydrothermally-altered silicic rock. Thermomechanical modeling with a typical 0.001 km 3 /yr eruption rate of hydrous basalt into a 38 km Kamchatkan arc crust produces two magma bodies, one near the Moho and the other engulfing the entire ... |
format |
Conference Object |
author |
Ilya N. Bindeman Vladimir L. Leonov Dylan P. Colón Aleksey N. Rogozin Niccole Shipley Brian Jicha Matthew W. Loewen Taras V. Gerya |
author_facet |
Ilya N. Bindeman Vladimir L. Leonov Dylan P. Colón Aleksey N. Rogozin Niccole Shipley Brian Jicha Matthew W. Loewen Taras V. Gerya |
author_sort |
Ilya N. Bindeman |
title |
Presentation_1_Isotopic and Petrologic Investigation, and a Thermomechanical Model of Genesis of Large-Volume Rhyolites in Arc Environments: Karymshina Volcanic Complex, Kamchatka, Russia.pptx |
title_short |
Presentation_1_Isotopic and Petrologic Investigation, and a Thermomechanical Model of Genesis of Large-Volume Rhyolites in Arc Environments: Karymshina Volcanic Complex, Kamchatka, Russia.pptx |
title_full |
Presentation_1_Isotopic and Petrologic Investigation, and a Thermomechanical Model of Genesis of Large-Volume Rhyolites in Arc Environments: Karymshina Volcanic Complex, Kamchatka, Russia.pptx |
title_fullStr |
Presentation_1_Isotopic and Petrologic Investigation, and a Thermomechanical Model of Genesis of Large-Volume Rhyolites in Arc Environments: Karymshina Volcanic Complex, Kamchatka, Russia.pptx |
title_full_unstemmed |
Presentation_1_Isotopic and Petrologic Investigation, and a Thermomechanical Model of Genesis of Large-Volume Rhyolites in Arc Environments: Karymshina Volcanic Complex, Kamchatka, Russia.pptx |
title_sort |
presentation_1_isotopic and petrologic investigation, and a thermomechanical model of genesis of large-volume rhyolites in arc environments: karymshina volcanic complex, kamchatka, russia.pptx |
publishDate |
2019 |
url |
https://doi.org/10.3389/feart.2018.00238.s002 https://figshare.com/articles/Presentation_1_Isotopic_and_Petrologic_Investigation_and_a_Thermomechanical_Model_of_Genesis_of_Large-Volume_Rhyolites_in_Arc_Environments_Karymshina_Volcanic_Complex_Kamchatka_Russia_pptx/7622555 |
long_lat |
ENVELOPE(160.000,160.000,56.000,56.000) ENVELOPE(158.291,158.291,52.953,52.953) |
geographic |
Kamchatka Peninsula Karymshina |
geographic_facet |
Kamchatka Peninsula Karymshina |
genre |
Kamchatka Kamchatka Peninsula |
genre_facet |
Kamchatka Kamchatka Peninsula |
op_relation |
doi:10.3389/feart.2018.00238.s002 https://figshare.com/articles/Presentation_1_Isotopic_and_Petrologic_Investigation_and_a_Thermomechanical_Model_of_Genesis_of_Large-Volume_Rhyolites_in_Arc_Environments_Karymshina_Volcanic_Complex_Kamchatka_Russia_pptx/7622555 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2018.00238.s002 |
_version_ |
1766050992124592128 |