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Repeated fracture and healing of silicic magma generate flow banding and earthquakes?

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Repeated fracture and healing of silicic magma generate flow banding and earthquakes? / Tuffen, Hugh; Dingwell, D. B.; Pinkerton, Harry.

In: Geology, Vol. 31, No. 12, 12.2003, p. 1089-1092.

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@article{4298786d372b495eabad1a157a16e7c8,
title = "Repeated fracture and healing of silicic magma generate flow banding and earthquakes?",
abstract = "Textures in an exceptionally preserved effusive rhyolite conduit at Torfajokull, Iceland, indicate that rising magma repeatedly fractured and healed at shallow levels in the conduit (RFH process). Anastomosing tuffisite veins filled by fine-grained juvenile clasts were generated by shear fracture of highly viscous magma in the glass transition interval. Welding of the particulate material during subsequent deformation led to thorough healing of veins, allowing repeated fracture of the same body of magma. We propose that the RFH process is a rechargeable trigger mechanism for hybrid seismicity and show that the time scale of the process and the fractures formed by it are consistent with the repeat time and magnitude of hybrid earthquakes during silicic eruptions. The RFH process may also form the flow banding that is nearly ubiquitous in obsidian.",
keywords = "Flow banding, obsidian, volcanic earthquakes, hybrid earthquakes, tuffisite, tuffisites, magma fracture, glass transition, Iceland, seismicity, volcano, lava dome, lava domes, seismic trigger mechanism",
author = "Hugh Tuffen and Dingwell, {D. B.} and Harry Pinkerton",
note = "Geological Society of America, P.O. Box 9140, Boulder, CO 80301-9140 USA (http://www.geosociety.org)",
year = "2003",
month = "12",
doi = "10.1130/G19777.1",
language = "English",
volume = "31",
pages = "1089--1092",
journal = "Geology",
issn = "0091-7613",
publisher = "Geological Society of America",
number = "12",

}

RIS

TY - JOUR

T1 - Repeated fracture and healing of silicic magma generate flow banding and earthquakes?

AU - Tuffen, Hugh

AU - Dingwell, D. B.

AU - Pinkerton, Harry

N1 - Geological Society of America, P.O. Box 9140, Boulder, CO 80301-9140 USA (http://www.geosociety.org)

PY - 2003/12

Y1 - 2003/12

N2 - Textures in an exceptionally preserved effusive rhyolite conduit at Torfajokull, Iceland, indicate that rising magma repeatedly fractured and healed at shallow levels in the conduit (RFH process). Anastomosing tuffisite veins filled by fine-grained juvenile clasts were generated by shear fracture of highly viscous magma in the glass transition interval. Welding of the particulate material during subsequent deformation led to thorough healing of veins, allowing repeated fracture of the same body of magma. We propose that the RFH process is a rechargeable trigger mechanism for hybrid seismicity and show that the time scale of the process and the fractures formed by it are consistent with the repeat time and magnitude of hybrid earthquakes during silicic eruptions. The RFH process may also form the flow banding that is nearly ubiquitous in obsidian.

AB - Textures in an exceptionally preserved effusive rhyolite conduit at Torfajokull, Iceland, indicate that rising magma repeatedly fractured and healed at shallow levels in the conduit (RFH process). Anastomosing tuffisite veins filled by fine-grained juvenile clasts were generated by shear fracture of highly viscous magma in the glass transition interval. Welding of the particulate material during subsequent deformation led to thorough healing of veins, allowing repeated fracture of the same body of magma. We propose that the RFH process is a rechargeable trigger mechanism for hybrid seismicity and show that the time scale of the process and the fractures formed by it are consistent with the repeat time and magnitude of hybrid earthquakes during silicic eruptions. The RFH process may also form the flow banding that is nearly ubiquitous in obsidian.

KW - Flow banding

KW - obsidian

KW - volcanic earthquakes

KW - hybrid earthquakes

KW - tuffisite

KW - tuffisites

KW - magma fracture

KW - glass transition

KW - Iceland

KW - seismicity

KW - volcano

KW - lava dome

KW - lava domes

KW - seismic trigger mechanism

U2 - 10.1130/G19777.1

DO - 10.1130/G19777.1

M3 - Journal article

VL - 31

SP - 1089

EP - 1092

JO - Geology

JF - Geology

SN - 0091-7613

IS - 12

ER -