Graben structure in the Las Cañadas edifice (Tenerife, Canary Islands): implications for active degassing and insights on the caldera formation

Galindo, Inés; Soriano, Carles; Martı́, Joan; Pérez, Nemesio M.

doi:10.1016/j.jvolgeores.2004.11.017

Cited by 23 publications

(18 citation statements)

References 35 publications

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“…This structure may have played an important role during the reactivation of the complex in 2004, as explained in section 7e. This graben is following the NE-SW trend described above and may be linked to a graben structure exposed in deposits of the Ucanca formation in the caldera wall close to the intersection of the Roques de García and the caldera wall (Galindo et al, 2005). It is obvious that the intersection of these two lineaments controlled the evolution of the CVC.…”

Section: Density-stratified Backgroundsupporting

confidence: 53%

Shallow structure beneath the Central Volcanic Complex of Tenerife from new gravity data: Implications for its evolution and recent reactivation

Gottsmann

Camacho²,

Martı́

et al. 2008

Physics of the Earth and Planetary Interiors

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Section: Density-stratified Backgroundsupporting

confidence: 53%

Shallow structure beneath the Central Volcanic Complex of Tenerife from new gravity data: Implications for its evolution and recent reactivation

Gottsmann

Camacho²,

Martı́

et al. 2008

Physics of the Earth and Planetary Interiors

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“…Galindo et al, 2005, have described these geological features indicating that the faults within ''Los Azulejos" structure affect the igneous materials of the Cañ adas edifice by the inclined and sub-vertical sheets intrusions formation. In addition, it has been reported a variable displacement of the fault is reported in (Galindo et al, 2005). They also point out that the kinetic indicators such as the offset of stratigraphic layers, shear-cleavage structures in mylonitic foliation, among others, in combination with the CO 2 active diffuse degassing activities and the hydrothermal activities cause a huge variety of mineralogical species.…”

Section: Geological Settingmentioning

confidence: 99%

“…One of the most impressive features at this outcrop is the variety of the different processes involved (i.e. hydrothermal processes, argilization and parent mineralogical alteration) (Galindo et al, 2005;Villasante-Marcos et al, 2014). Galindo et al, 2005, have described these geological features indicating that the faults within ''Los Azulejos" structure affect the igneous materials of the Cañ adas edifice by the inclined and sub-vertical sheets intrusions formation.…”

Section: Geological Settingmentioning

confidence: 99%

“…hydrothermal processes, argilization and parent mineralogical alteration) (Galindo et al, 2005;Villasante-Marcos et al, 2014). Galindo et al, 2005, have described these geological features indicating that the faults within ''Los Azulejos" structure affect the igneous materials of the Cañ adas edifice by the inclined and sub-vertical sheets intrusions formation. In addition, it has been reported a variable displacement of the fault is reported in (Galindo et al, 2005).…”

Section: Geological Settingmentioning

confidence: 99%

“…On the other hand, yellowish and blank coloration can be observed on the fumarolic structure and the argilization of the parent minerals. These colorations present really interesting formations like mushrooms textures and veins circulation with sulfates and iron oxides mineral species (Bustillo, 1989;Galindo et al, 2005). The colors in the alteration correspond to a process termed ''Los Azulejos" type alteration and it is also present on other Canary Island graben formations such as Gran Canaria Island, Spain (Donoghue et al, 2008).…”

Section: Geological Settingmentioning

confidence: 99%

See 2 more Smart Citations

Raman–Mössbauer–XRD studies of selected samples from “Los Azulejos” outcrop: A possible analogue for assessing the alteration processes on Mars

Lalla

Sanz-Arranz

López‐Reyes

et al. 2016

Advances in Space Research

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The outcrop of ''Los Azulejos" is visible at the interior of the Cañ adas Caldera in Tenerife Island (Spain). It exhibits a great variety of alteration processes that could be considered as terrestrial analogue for several geological processes on Mars. This outcrop is particularly interesting due to the content of clays, zeolite, iron oxides, and sulfates corresponding to a hydrothermal alteration catalogued as ''Azulejos" type alteration. A detailed analysis by portable and laboratory Raman systems as well as other different techniques such as X-ray diffraction (XRD) and Mö ssbauer spectroscopy has been carried out (using twin-instruments from Martian lander missions: Mö ssbauer spectrometer MIMOS-II from the NASA-MER mission of 2001 and the XRD diffractometer from the NASA-MSL Curiosity mission of 2012). The mineral identification presents the following mineral species: magnetite, goethite, hematite, anatase, rutile, quartz, gregoryite, sulfate (thenardite and hexahydrite), diopside, feldspar, analcime, kaolinite and muscovite. Moreover, the in-situ Raman and MicroRaman measurements have been performed in order to compare the capabilities of the portable system specially focused for the next ESA Exo-Mars mission. The mineral detection confirms the sub-aerial alteration on the surface and the hydrothermal processes by the volcanic fluid circulations in the fresh part. Therefore, the secondary more abundant mineralization acts as the color agent of the rocks. Thus, the zeolite-illite group is the responsible for the bluish coloration, as well as the feldspars and carbonates for the whitish and the iron oxide for the redish parts. The XRD system was capable to detect a minor proportion of pyroxene, which is not visible by Raman and Mö ssbauer spectroscopy due to the ''Azulejos" alteration of the parent material on the outcrop. On the other hand, Mö ssbauer spectroscopy was capable of detecting different types of iron-oxides (Fe 3+/2+ -oxide phases). These analyses emphasize the strength of the different techniques and the working synergy of the three different techniques together for planetary space missions.

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Deformation of basaltic shield volcanoes under cointrusive stress permutations

2014

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We performed a microstructural study of Piton des Neiges (La Réunion Island) to understand how intrusions and stresses control each other in basaltic volcanoes. Our study reveals that three perpendicular intrusions trends coexisted during the 2 Myr history of the volcano: a N120-140°E rift zone, a perpendicular dike trend, and swarms of subhorizontal intrusions hereafter called "sill zones". Independently, the inversion of fault-slip data shows that incompatible paleostress fields recurrently occurred along with the intrusions: a dominant NNE-SSW extension, a perpendicular extension, and strike-slip or compressional regimes. The orientations of paleostresses are consistent with the orientations of the three perpendicular intrusion populations. We propose that stress accumulation in the edifice under the effect of repeated magma injections resulted in permutations of the principal axes of the stress tensor, causing a reorientation of subsequent intrusions. Stress permutations were cyclical. Each cycle started with dike injections in an extensional stress field, reducing the deviatoric stress and switching the axes of principal stresses, and finished with sill intrusions in a compressional stress field. Sill zones acted as detachment planes, restoring the extensional stress field and initiating a new cycle of permutations. Our model of stress permutations is in agreement with the pattern of eruptions and deformation observed at Piton de la Fournaise. In contrast with the Hawaiian model of spreading on a décollement, stress permutations in La Réunion's volcanoes imply that the basal deformation of the edifices, if any, is not sufficient to compensate the reduction of deviatoric stress caused by intrusions.

show abstract

Graben structure in the Las Cañadas edifice (Tenerife, Canary Islands): implications for active degassing and insights on the caldera formation

Cited by 23 publications

References 35 publications

Shallow structure beneath the Central Volcanic Complex of Tenerife from new gravity data: Implications for its evolution and recent reactivation

Shallow structure beneath the Central Volcanic Complex of Tenerife from new gravity data: Implications for its evolution and recent reactivation

Raman–Mössbauer–XRD studies of selected samples from “Los Azulejos” outcrop: A possible analogue for assessing the alteration processes on Mars

Deformation of basaltic shield volcanoes under cointrusive stress permutations

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