Miocene rifting of Fuerteventura (Canary Islands)

被引:13
|
作者
Fernandez, Carlos [1 ]
Casillas, Ramon
Garcia Navarro, Encarnacion
Gutierrez, Margarita
Camacho, Manuel A.
Ahijado, Agustina
机构
[1] Univ Huelva, Dept Geodinam & Paleontol, E-21071 Huelva, Spain
[2] Univ La Laguna, Dept Edafol & Geol, San Cristobal la Laguna 38206, Canary Isl, Spain
[3] Estudios Terreno SL, Santa Cruz de Tenerife 38390, CanaryIsl, Spain
关键词
D O I
10.1029/2005TC001941
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
[1] The older geological units of the volcanic island of Fuerteventura ( Canary Islands), i.e., the so-called basal complex and the lower part of the subaerial volcanic rocks, show abundant structures indicative of a long-lived period of Miocene tectonic activity. These structures include faults, dike swarms, kilometer-scale folds, tilted sequences, and fissural and central volcanic edifices. A detailed structural study, based on geological mapping and the use of fault slip inversion techniques and statistical analysis of dike orientation, has allowed the identification of three separated Miocene deformation phases: M-D-1, M-D-2, and M-D-3. The average extension directions determined for these phases are NW-SE, NNE-SSW, and ENE-WSW, respectively. A model of oceanic lithosphere rifting is proposed to account for this deformation history. A buoyant, anomalous sublithosphere mantle triggered the extension in the lithosphere beneath Fuerteventura, isolating it during the early and middle Miocene from the plate-scale collision regime predominant in the NW corner of the African plate.
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页数:27
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