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http://hdl.handle.net/2122/620
DC Field | Value | Language |
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dc.contributor.authorall | Ventura, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia | en |
dc.date.accessioned | 2006-01-23T09:00:44Z | en |
dc.date.available | 2006-01-23T09:00:44Z | en |
dc.date.issued | 2004 | en |
dc.identifier.uri | http://hdl.handle.net/2122/620 | en |
dc.description.abstract | A circular dome from Lipari Island consists of latitic enclaves hosted in a rhyolitic magma. A strain analysis of the enclaves has been carried out and the pure shear (a) and simple shear (g) deformation, the vorticity number Wk and flow kinematics are determined. The axial ratio Rf of the enclaves and the angle f between the long axis of the enclaves and the transport direction are measured in 131 sites concentrated in the axial zone (z1), upper-distal zone (z2) and basal zone (z3) of the flow. The f values depict a pattern suggesting endogenous growth. In z1, a/g > 1. In z2, 1 < a < 1.35 and 1.8 < g < 0.5. In z3, 1 < a < 1.5 and 0.3 < g < 2.8. In z1, Wk < 0.5. In z2 and z3, Wk > 0.8. Lateral stretching due to the upward motion of magma from the conduit prevails in z1. Here the increase of pure shear strain from the bottom to the top reflects strain accumulation due to endogenous growth. z2 and z3 suffer simple shear deformation. In z3, the sense of shear is consistent with the transport direction. An opposite sense of shear characterizes z2. This is due to velocity gradients located in the lower and upper portions of the flow. The kinematics is viscous spreading in z1 and viscous gliding (hyperbolic flow) in z2â z3.Possible rupturing of the exterior may be important in z1, where lateral stretching occurs, and in z3, where g is at a maximum. The effusion rate is 1.93 m3/s. Strain rates calculated using structural data span a range from 1.9 to 5.8.10 6 s 1. | en |
dc.format.extent | 419 bytes | en |
dc.format.extent | 529103 bytes | en |
dc.format.mimetype | text/html | en |
dc.format.mimetype | application/pdf | en |
dc.language.iso | English | en |
dc.publisher.name | American Geophysical Union | en |
dc.relation.ispartof | Journal Geiphysical Research | en |
dc.relation.ispartofseries | 109 | en |
dc.subject | lava domes | en |
dc.subject | kinematics | en |
dc.subject | emplacement mechanism | en |
dc.subject | strain analysis | en |
dc.subject | enclaves | en |
dc.subject | viscous flows | en |
dc.title | The strain path and kinematics of lava domes: An example from Lipari | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 1-10 | en |
dc.identifier.URL | www.agu.org/journals/jb/ | en |
dc.subject.INGV | 04. Solid Earth::04.04. Geology::04.04.09. Structural geology | en |
dc.subject.INGV | 04. Solid Earth::04.08. Volcanology::04.08.03. Magmas | en |
dc.subject.INGV | 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks | en |
dc.identifier.doi | 10.1029/2003JB002740 | en |
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De Rosa, R. Mazzuoli, and E. Colletta (1996), Deformation patterns in high-viscous lava flows inferred from the preferred orientation and tiling of crystals: An example from Salina Aeolian Islands, Southern Tyrrhenian Sea-Italy, Bull. Volcanol., 57, 555–562. Voight, B., E. K. Constantine, S. Siswowidjoyo, and R. Torley (2000), Historical eruptions of Merapi Volcano, Central Java, Indonesia, 1768– 1998, J. Volcanol. Geotherm. Res, 100, 69– 138. Weijermars, R. (1998), Taylor-mill analogues of £ow and defor- mation in rocks, J. Struct. Geol., 20, 77– 92. Williams, Q., and O. T. Tobish (1994), Microgranitic enclave shapes and magmatic strain histories, Constraints from drop deformation theory, J. Geophys. Res., 99, 24,359– 24,368. Wooster, M. J., T. Kaneko, S. Nakada, and H. Shimizu (2000), Discrimination of lava dome activity styles using satellite-derived thermal structures, J. Volcanol. Geotherm. Res, 102, 97– 118. | en |
dc.description.fulltext | partially_open | en |
dc.contributor.author | Ventura, G. | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia | - |
crisitem.author.orcid | 0000-0001-9388-9985 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
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