Emplazamiento en una zona de cizalla dúctil - frágil transtensiva para el Plutón de Pájara, Fuerteventura, Islas Canarias
7
Citation
0
Reference
12
Related Paper
Abstract:
The mesostructures within the host-rocks as well as the internal deformation of the Pajara Pluton in Fuerteventura, allow the definition of a N 5-15 E directed ductile-brittle transtensive shear-zone, that conditioned the emplacement of the intrusive core represented by this plutonic body. We have indirectly estimaled an age of 22-21 Ma for this shear-zone, which is considered as coeval to the thermal metamorphism.Cite
Dike
Archipelago
Geochronology
Peninsula
Cite
Citations (74)
The Canarian Archipelago is a group of volcanic islands on a slow-moving oceanic plate, close to a continental margin. The origins of the archipelago are controversial: a hotspot or mantle plume, a zone of lithospheric deformation, a region of compressional block-faulting or a rupture propagating westwards from the active Atlas Mountains fold belt have been proposed by different authors. However, comparison of the Canarian Archipelago with the prototypical hotspot-related island group, the Hawaiian Archipelago, reveals that the differences between the two are not as great as had previously been supposed on the basis of older data. Quaternary igneous activity in the Canaries is concentrated at the western end of the archipelago, close to the present-day location of the inferred hotspot. This is the same relationship as seen in the Hawaiian and Cape Verde islands. The latter archipelago, associated with a well-defined but slow-moving mantle plume, shows anomalies in a plot of island age against distance which are comparable to those seen in the Canary Islands: these anomalies cannot therefore be used to argue against a hotspot origin for the Canaries. Individual islands in both archipelagoes are characterized by initial rapid growth (the ‘shield-building’ stages of activity), followed by a period of quiescence and deep erosion (erosion gap) which in turn is followed by a ‘post-erosional’ stage of activity. The absence of post-shield stage subsidence in the Canaries is in marked contrast with the major subsidence experienced by the Hawaiian Islands, but is comparable with the lack of subsidence evident in other island groups at slow-moving hotspots, such as the Cape Verdes. Comparison of the structure and structural evolution of the Canary Islands with other oceanic islands such as Hawaii and Réunion reveals many similarities. These include the development of triple (‘Mercedes Star’) rift zones and the occurrence of giant lateral collapses on the flanks of these rift zones. The apparent absence of these features in the post-erosional islands may in part be a result of their greater age and deeper erosion, which has removed much of the evidence for their early volcanic architecture. We conclude that the many similarities between the Canary Islands and island groups whose hotspot origins are undisputed show that the Canaries have been produced in the same way.
Archipelago
Hotspot (geology)
Mantle plume
Continental Margin
Cite
Citations (353)
Abstract Eight new K-Ar determinations are presented which, together with field relations and previous studies, are used to construct a chronology of the volcanic build-up of Fuerteventura. The earliest island-building volcanics are late Cretaceous to early Tertiary alkaline basaltic volcaniclastic sediments, and these may be correlated with the early gabbro/pyroxenite intrusions which were probably subvolcanic to the early edifice. This was followed by a carbonatitic subvolcanic complex then by two later high-level gabbro/pyroxenite plutons, the latter being early Miocene or older. The emplacement of a subsequent middle Miocene gabbro/syenite ring complex caused widespread resetting of the Ar contents of the earlier rocks, but nevertheless consideration of the mineralogy of the rocks in conjunction with the field relations enables the long volcanic history ( c . 80 Ma) to be reconstructed.
Chronology
Cite
Citations (126)
Cite
Citations (211)
Massif
Basement
Cite
Citations (75)
Radiogenic nuclide
Chronology
Subaerial
Geochronology
Cite
Citations (56)
Summary On Fuerteventura, inner Canary Islands, a phase of early Cretaceous deposition on a passive continental margin was terminated in Albian time by strong localized uplift associated with onset of calcareous pelagic sedimentation. Later, during early Tertiary times, spasmodic episodes of submarine alkali volcanism led to the construction of a thick lava pile. After folding of the lower submarine volcanic rocks, and the underlying pre-volcanic sedimentary rocks, parts of the Basal Complex were emergent by Oligocene to Miocene times, fringed by coral and algal reefs. With renewed early Miocene uplift, the reefs disintegrated, followed by block faulting, intrusion of plutons, and a final phase of submarine dyke intrusion. There was then strong uplift coupled with deep erosion, extrusion of sub-horizontal Neogene plateau lavas and further intrusion of plutons. Regional comparisons suggest that tectonic events on Fuerteventura may have a bearing on sedimentary hiatuses and gravity sliding events which affected the adjacent West African continental margin.
Continental Margin
Cite
Citations (70)
Subaerial
Submarine volcano
Seamount
Shield volcano
Volcanic plateau
Scoria
Cite
Citations (99)
Archipelago
Chronology
Table (database)
Cite
Citations (173)
Research Article| October 01, 1998 Mesozoic sequence of Fuerteventura (Canary Islands): Witness of Early Jurassic sea-floor spreading in the central Atlantic Christian Steiner; Christian Steiner 1Institut de Géologie et Paléontologie, Université de Lausanne, CH-1015 Lausanne, Switzerland Search for other works by this author on: GSW Google Scholar Alice Hobson; Alice Hobson 1Institut de Géologie et Paléontologie, Université de Lausanne, CH-1015 Lausanne, Switzerland Search for other works by this author on: GSW Google Scholar Philippe Favre; Philippe Favre 2CH-1985 La Forclaz, Switzerland Search for other works by this author on: GSW Google Scholar Gérard M. Stampfli; Gérard M. Stampfli 1Institut de Géologie et Paléontologie, Université de Lausanne, CH-1015 Lausanne, Switzerland Search for other works by this author on: GSW Google Scholar Jean Hernandez Jean Hernandez 1Institut de Géologie et Paléontologie, Université de Lausanne, CH-1015 Lausanne, Switzerland Search for other works by this author on: GSW Google Scholar Author and Article Information Christian Steiner 1Institut de Géologie et Paléontologie, Université de Lausanne, CH-1015 Lausanne, Switzerland Alice Hobson 1Institut de Géologie et Paléontologie, Université de Lausanne, CH-1015 Lausanne, Switzerland Philippe Favre 2CH-1985 La Forclaz, Switzerland Gérard M. Stampfli 1Institut de Géologie et Paléontologie, Université de Lausanne, CH-1015 Lausanne, Switzerland Jean Hernandez 1Institut de Géologie et Paléontologie, Université de Lausanne, CH-1015 Lausanne, Switzerland Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1998) 110 (10): 1304–1317. https://doi.org/10.1130/0016-7606(1998)110<1304:MSOFCI>2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Christian Steiner, Alice Hobson, Philippe Favre, Gérard M. Stampfli, Jean Hernandez; Mesozoic sequence of Fuerteventura (Canary Islands): Witness of Early Jurassic sea-floor spreading in the central Atlantic. GSA Bulletin 1998;; 110 (10): 1304–1317. doi: https://doi.org/10.1130/0016-7606(1998)110<1304:MSOFCI>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The Fuerteventura Jurassic sedimentary succession consists of oceanic and clastic deposits, the latter derived from the southwestern Moroccan continental margin. Normal mid-oceanic-ridge basalt (N-MORB) flows and breccias are found at the base of the sequence and witness sea-floor spreading events in the central Atlantic. These basalts were extruded in a postrift environment (post–late Pliensbachian). We propose a Toarcian age for the Atlantic oceanic floor in this region, on the basis of the presence higher up in the sequence of the Bositra buchi filament microfacies (Aalenian–Bajocian) and of clastic deposits reflecting tectono-eustatic events (e.g., late Toarcian to mid-Callovian erosion of the rift shoulder). The S-1 sea-floor oceanic magnetic anomaly west of Fuerteventura is therefore at least Toarcian in age.The remaining sequence records Atlantic-Tethyan basinal facies (e.g., Callovian–Oxfordian red clays, Aptian–Albian black shales) alternating with clastic deposits (e.g., Kimmeridgian–Berriasian periplatform calciturbidites and a Lower Cretaceous deep-sea fan system).The Fuerteventura N-MORB outcrops represent the only Early Jurassic oceanic basement described so far in the central Atlantic. They are covered by a 1600 m, nearly continuous sedimentary sequence which extends to Upper Cretaceous facies. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Cite
Citations (121)