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Dykes and structures of the NE rift of Tenerife, Canary Islands: a record of stabilisation and destabilisation of ocean island rift zones
- 作者:A. Delcamp (15) delcampa@tcd.ie
V. R. Troll (16) Valentin.Troll@geo.uu.se B. van Wyk de Vries (2) b.vanwyk@opgc.univ-bpclermont.fr J. C. Carracedo (3) jcarracedo@proyinves.ulpgc.es M. S. Petronis (4) mspetro@nmhu.edu F. J. P茅rez-Torrado (3) fperez@dfis.ulpgc.es F. M. Deegan (16) Frances.Deegan@geo.uu.se - 关键词:Oceanic island rift zones – ; Lateral collapses – ; Intrusive complex – ; Dykes – ; Lateral flank spreading – ; Tenerife
- 刊名:Bulletin of Volcanology
- 出版年:2012
- 出版时间:July 2012
- 年:2012
- 卷:74
- 期:5
- 页码:963-980
- 全文大小:1.7 MB
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J Volcanol Geotherm Res 127:107–120 69. Walter TR, Troll VR, Cailleau B, Belousov A, Schmincke HU, Bogaard P, Amelung F (2005) Rift zone reorganization through flank instability on ocean island volcanoes: Tenerife, Canary Islands. Bull Volcanol 67:281–291 70. Walter TR, Kl眉gel A, M眉nn S (2006) Gravitational spreading and formation of new rift zones on overlapping volcanoes. Terra Nova 18:26–33 71. Watts AB (1994) Crustal structure, gravity anomalies and flexure of the lithosphere in the vicinity of the Canary Islands. Geophys Int 119:648–666 72. Watts AB, Masson DG (1995) A giant landslide on the north flank of Tenerife, Canary Islands. J Geophys Res 100:24487–24498 - 作者单位:1. Department of Geology, Museum Building, Trinity College Dublin, Dublin 2, Ireland2. Laboratoire Magmas et Volcans CNRS-UMR 6524, Universit茅 Blaise Pascal, Laboratoire Magmas et Volcans, LMV, CNRS, UMR 6524, IRD R163, 5 rue Kessler, 63038 Clermont-Ferrand, France3. GEOVOL, Dpto. F铆sica, Universidad de Las Palmas de Gran Canaria, Las Palmas, Spain4. Environmental Geology Natural Resource Management Department, New Mexico Highlands University, Las Vegas, NM 87 701, USA5. Department of Geography, Vrije Universiteit Brussel, Brussels, Belgium6. Department of Earth Sciences, CEMPEG, Section for Mineralogy, Petrology and Tectonics, Uppsala University, 75236 Uppsala, Sweden
- 刊物类别:Earth and Environmental Science
- 刊物主题:Earth sciences
Geology Geophysics and Geodesy Mineralogy Sedimentology
- 出版者:Springer Berlin / Heidelberg
- ISSN:1432-0819
文摘
Many oceanic island rift zones are associated with lateral sector collapses, and several models have been proposed to explain this link. The North–East Rift Zone (NERZ) of Tenerife Island, Spain offers an opportunity to explore this relationship, as three successive collapses are located on both sides of the rift. We have carried out a systematic and detailed mapping campaign on the rift zone, including analysis of about 400 dykes. We recorded dyke morphology, thickness, composition, internal textural features and orientation to provide a catalogue of the characteristics of rift zone dykes. Dykes were intruded along the rift, but also radiate from several nodes along the rift and form en 茅chelon sets along the walls of collapse scars. A striking characteristic of the dykes along the collapse scars is that they dip away from rift or embayment axes and are oblique to the collapse walls. This dyke pattern is consistent with the lateral spreading of the sectors long before the collapse events. The slump sides would create the necessary strike-slip movement to promote en 茅chelon dyke patterns. The spreading flank would probably involve a basal decollement. Lateral flank spreading could have been generated by the intense intrusive activity along the rift but sectorial spreading in turn focused intrusive activity and allowed the development of deep intra-volcanic intrusive complexes. With continued magma supply, spreading caused temporary stabilisation of the rift by reducing slopes and relaxing stress. However, as magmatic intrusion persisted, a critical point was reached, beyond which further intrusion led to large-scale flank failure and sector collapse. During the early stages of growth, the rift could have been influenced by regional stress/strain fields and by pre-existing oceanic structures, but its later and mature development probably depended largely on the local volcanic and magmatic stress/strain fields that are effectively controlled by the rift zone growth, the intrusive complex development, the flank creep, the speed of flank deformation and the associated changes in topography. Using different approaches, a similar rift evolution has been proposed in volcanic oceanic islands elsewhere, showing that this model likely reflects a general and widespread process. This study, however, shows that the idea that dykes orient simply parallel to the rift or to the collapse scar walls is too simple; instead, a dynamic interplay between external factors (e.g. collapse, erosion) and internal forces (e.g. intrusions) is envisaged. This model thus provides a geological framework to understand the evolution of the NERZ and may help to predict developments in similar oceanic volcanoes elsewhere.
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