Implications of silicic vent patterns for the presence of large crustal magma chambers
Identifieur interne : 000103 ( Istex/Corpus ); précédent : 000102; suivant : 000104Implications of silicic vent patterns for the presence of large crustal magma chambers
Auteurs : Charles R. BaconSource :
- Journal of Geophysical Research: Solid Earth [ 0148-0227 ] ; 1985-11-10.
English descriptors
- KwdEn :
- Andesite vents, Basalt, Basaltic magma, Basaltic vents, Caldera, Cape riva eruption, Cleetwood flow, Cord6n caulle, Coso, Coso volcanicfield, Crater, Crater lake, Crater lake caldera, Crustal, Dacite, Dike, Eastern california, Eruption, Geophys, Glass mountain, Holocene, Implications ofsilicic vent patterns crustal, Krakatau, Lava, Llao rock, Long valley, Magma, Magma chambers, Mazama, Metz, Moat, Moat rhyolites, Mono, Mono craters, Overall trend, Precaldera, Precalderasilicic vents, Pyroclastic, Rhyodacite, Rhyodacitic, Rhyolite, Rhyolitic, Ring structure, Roof rocks, Silicic, Silicic magma, Silicic patternscrustal vent, Silicic system, Silicic vents, Southern chile, Southern lavas, Tectonic, Tectonically, Tuff, Valley caldera, Vent, Vent alignments, Vent distributions, Vent patterns, Volcanic, Volcanism, Volcano.
- Teeft :
- Andesite vents, Basalt, Basaltic magma, Basaltic vents, Caldera, Cape riva eruption, Cleetwood flow, Cord6n caulle, Coso, Coso volcanicfield, Crater, Crater lake, Crater lake caldera, Crustal, Dacite, Dike, Eastern california, Eruption, Geophys, Glass mountain, Holocene, Implications ofsilicic vent patterns crustal, Krakatau, Lava, Llao rock, Long valley, Magma, Magma chambers, Mazama, Metz, Moat, Moat rhyolites, Mono, Mono craters, Overall trend, Precaldera, Precalderasilicic vents, Pyroclastic, Rhyodacite, Rhyodacitic, Rhyolite, Rhyolitic, Ring structure, Roof rocks, Silicic, Silicic magma, Silicic patternscrustal vent, Silicic system, Silicic vents, Southern chile, Southern lavas, Tectonic, Tectonically, Tuff, Valley caldera, Vent, Vent alignments, Vent distributions, Vent patterns, Volcanic, Volcanism, Volcano.
Abstract
On the basis of the distribution of silicic vents, many volcanic fields can be grouped with (1) igneous systems that may be small and whose vent locations are controlled by regional tectonics, (2) those that include sizable crustal magma bodies which erupt at sites determined by their anomalous local stress fields, or (3) relatively small volume systems that are transitional between categories 1 and 2. Linear vent patterns that are aligned normal to the regional least principal stress (σ3) commonly are associated with absence of evidence for large, shallow magma bodies. The Coso volcanic field and the Inyo‐Mono domes in California and probably the South Sister area in Oregon are examples of such systems. The 1960 dacitic fissure eruption at Cordón Caulle in southern Chile evidently is linked to tectonic stress relaxation associated with the great earthquake that occurred 48 hours before the eruption began. Large, shallow magma chambers are thought to perturb the local stress field so that areal patterns of silicic vents are diffuse, radial, or arcuate. Such systems may erupt great volumes of pyroclastic material catastrophically and produce large calderas. Well‐preserved examples of late precaldera leaks of silicic magma occur at Long Valley, California, and Mount Mazama (Crater Lake), Oregon. Other possible examples are noted. Some of these, those which formed calderas smaller than Crater Lake, apparently were preceded by silicic eruptions from aligned vents. Bearing in mind that there exists a transitional group between tectonically controlled small systems and very large magma chambers, vent distributions can be useful in evaluating potential volcanic hazards for silicic volcanic fields.
Url:
DOI: 10.1029/JB090iB13p11243
Links to Exploration step
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<front><div type="abstract">On the basis of the distribution of silicic vents, many volcanic fields can be grouped with (1) igneous systems that may be small and whose vent locations are controlled by regional tectonics, (2) those that include sizable crustal magma bodies which erupt at sites determined by their anomalous local stress fields, or (3) relatively small volume systems that are transitional between categories 1 and 2. Linear vent patterns that are aligned normal to the regional least principal stress (σ3) commonly are associated with absence of evidence for large, shallow magma bodies. The Coso volcanic field and the Inyo‐Mono domes in California and probably the South Sister area in Oregon are examples of such systems. The 1960 dacitic fissure eruption at Cordón Caulle in southern Chile evidently is linked to tectonic stress relaxation associated with the great earthquake that occurred 48 hours before the eruption began. Large, shallow magma chambers are thought to perturb the local stress field so that areal patterns of silicic vents are diffuse, radial, or arcuate. Such systems may erupt great volumes of pyroclastic material catastrophically and produce large calderas. Well‐preserved examples of late precaldera leaks of silicic magma occur at Long Valley, California, and Mount Mazama (Crater Lake), Oregon. Other possible examples are noted. Some of these, those which formed calderas smaller than Crater Lake, apparently were preceded by silicic eruptions from aligned vents. Bearing in mind that there exists a transitional group between tectonically controlled small systems and very large magma chambers, vent distributions can be useful in evaluating potential volcanic hazards for silicic volcanic fields.</div>
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<abstract>On the basis of the distribution of silicic vents, many volcanic fields can be grouped with (1) igneous systems that may be small and whose vent locations are controlled by regional tectonics, (2) those that include sizable crustal magma bodies which erupt at sites determined by their anomalous local stress fields, or (3) relatively small volume systems that are transitional between categories 1 and 2. Linear vent patterns that are aligned normal to the regional least principal stress (σ3) commonly are associated with absence of evidence for large, shallow magma bodies. The Coso volcanic field and the Inyo‐Mono domes in California and probably the South Sister area in Oregon are examples of such systems. The 1960 dacitic fissure eruption at Cordón Caulle in southern Chile evidently is linked to tectonic stress relaxation associated with the great earthquake that occurred 48 hours before the eruption began. Large, shallow magma chambers are thought to perturb the local stress field so that areal patterns of silicic vents are diffuse, radial, or arcuate. Such systems may erupt great volumes of pyroclastic material catastrophically and produce large calderas. Well‐preserved examples of late precaldera leaks of silicic magma occur at Long Valley, California, and Mount Mazama (Crater Lake), Oregon. Other possible examples are noted. Some of these, those which formed calderas smaller than Crater Lake, apparently were preceded by silicic eruptions from aligned vents. Bearing in mind that there exists a transitional group between tectonically controlled small systems and very large magma chambers, vent distributions can be useful in evaluating potential volcanic hazards for silicic volcanic fields.</abstract>
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<profileDesc><abstract style="main"><p xml:id="jgrb5392-para-0001">On the basis of the distribution of silicic vents, many volcanic fields can be grouped with (1) igneous systems that may be small and whose vent locations are controlled by regional tectonics, (2) those that include sizable crustal magma bodies which erupt at sites determined by their anomalous local stress fields, or (3) relatively small volume systems that are transitional between categories 1 and 2. Linear vent patterns that are aligned normal to the regional least principal stress (σ<hi rend="subscript">3</hi>
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<subjectInfo><subject href="http://psi.agu.org/specialSection/LVCCAL1">Long Valley Caldera, California</subject>
<subject href="http://psi.agu.org/taxonomy5/8100">TECTONOPHYSICS</subject>
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<subject href="http://psi.agu.org/taxonomy5/9300">GEOGRAPHIC LOCATION</subject>
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<selfCitationGroup><citation xml:id="jgrb5392-cit-0000" type="self"><author><familyName>Bacon</familyName>
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(<pubYear year="1985">1985</pubYear>
), <articleTitle>Implications of silicic vent patterns for the presence of large crustal magma chambers</articleTitle>
, <journalTitle>J. Geophys. Res.</journalTitle>
, <vol>90</vol>
(<issue>B13</issue>
), <pageFirst>11243</pageFirst>
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<contentMeta><titleGroup><title type="main">Implications of silicic vent patterns for the presence of large crustal magma chambers</title>
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<abstractGroup><abstract type="main"><p xml:id="jgrb5392-para-0001">On the basis of the distribution of silicic vents, many volcanic fields can be grouped with (1) igneous systems that may be small and whose vent locations are controlled by regional tectonics, (2) those that include sizable crustal magma bodies which erupt at sites determined by their anomalous local stress fields, or (3) relatively small volume systems that are transitional between categories 1 and 2. Linear vent patterns that are aligned normal to the regional least principal stress (σ<sub>3</sub>
) commonly are associated with absence of evidence for large, shallow magma bodies. The Coso volcanic field and the Inyo‐Mono domes in California and probably the South Sister area in Oregon are examples of such systems. The 1960 dacitic fissure eruption at Cordón Caulle in southern Chile evidently is linked to tectonic stress relaxation associated with the great earthquake that occurred 48 hours before the eruption began. Large, shallow magma chambers are thought to perturb the local stress field so that areal patterns of silicic vents are diffuse, radial, or arcuate. Such systems may erupt great volumes of pyroclastic material catastrophically and produce large calderas. Well‐preserved examples of late precaldera leaks of silicic magma occur at Long Valley, California, and Mount Mazama (Crater Lake), Oregon. Other possible examples are noted. Some of these, those which formed calderas smaller than Crater Lake, apparently were preceded by silicic eruptions from aligned vents. Bearing in mind that there exists a transitional group between tectonically controlled small systems and very large magma chambers, vent distributions can be useful in evaluating potential volcanic hazards for silicic volcanic fields.</p>
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<abstract>On the basis of the distribution of silicic vents, many volcanic fields can be grouped with (1) igneous systems that may be small and whose vent locations are controlled by regional tectonics, (2) those that include sizable crustal magma bodies which erupt at sites determined by their anomalous local stress fields, or (3) relatively small volume systems that are transitional between categories 1 and 2. Linear vent patterns that are aligned normal to the regional least principal stress (σ3) commonly are associated with absence of evidence for large, shallow magma bodies. The Coso volcanic field and the Inyo‐Mono domes in California and probably the South Sister area in Oregon are examples of such systems. The 1960 dacitic fissure eruption at Cordón Caulle in southern Chile evidently is linked to tectonic stress relaxation associated with the great earthquake that occurred 48 hours before the eruption began. Large, shallow magma chambers are thought to perturb the local stress field so that areal patterns of silicic vents are diffuse, radial, or arcuate. Such systems may erupt great volumes of pyroclastic material catastrophically and produce large calderas. Well‐preserved examples of late precaldera leaks of silicic magma occur at Long Valley, California, and Mount Mazama (Crater Lake), Oregon. Other possible examples are noted. Some of these, those which formed calderas smaller than Crater Lake, apparently were preceded by silicic eruptions from aligned vents. Bearing in mind that there exists a transitional group between tectonically controlled small systems and very large magma chambers, vent distributions can be useful in evaluating potential volcanic hazards for silicic volcanic fields.</abstract>
<relatedItem type="host"><titleInfo><title>Journal of Geophysical Research: Solid Earth</title>
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<topic authorityURI="http://psi.agu.org/specialSection/LVCCAL1">Long Valley Caldera, California</topic>
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<topic authorityURI="http://psi.agu.org/taxonomy5/8199">General or miscellaneous</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/9300">GEOGRAPHIC LOCATION</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/9350">Information Related to Geographic Region: North America</topic>
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<identifier type="eISSN">2156-2202</identifier>
<identifier type="DOI">10.1002/(ISSN)2156-2202b</identifier>
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<part><date>1985</date>
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