Tectonic evolution of the emergent part of a volcanic ocean island: Lanzarote, Canary Islands

Marinoni, Laura; Pasquarè, Giorgio

doi:10.1016/0040-1951(94)90110-4

Cited by 57 publications

(53 citation statements)

References 49 publications

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“…Together with the island of Fuerteventura, Lanzarote represents the emergent part of the East Canary Ridge (Fig. 1), a NNE-SSW linear volcanic structure about of 400 km in length and 65 km in width (Marinoni and Pasquaré, 1994). Subaerial volcanic activity in Lanzarote dates back to the midMiocene (Abdel Monem et al, 1971;Coello et al, 1992).…”

Section: Geological Backgroundmentioning

confidence: 99%

Seismic properties of the upper mantle beneath Lanzarote (Canary Islands): Model predictions based on texture measurements by EBSD

et al. 2006

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We present a petrophysical analysis of upper mantle xenoliths, collected in the Quaternary alkali basalt fields (Series III and IV) from the island of Lanzarote. The samples consist of eight harzburgite and four dunite nodules, 5 to 15 cm in size, and exhibit a typical protogranular to porphyroclastic texture. An anomalous foliation resulting from strong recovery processes is observed in half of the specimens. The lattice preferred orientations (LPO) of olivine, orthopyroxene and clinopyroxene were measured using electron backscatter diffraction (EBSD). In most samples, olivine exhibits LPOs intermediate between the typical single crystal texture and the [100] fiber texture. Occasionally, the [010] fiber texture was also observed. Simultaneous occurrence of both types of fiber textures suggests the existence of more than one deformation regime, probably dominated by a simple shear component under low strain rate and moderate to high temperature. Orthopyroxene and clinopyroxene display a weaker but significant texture. The LPO data were used to calculate the seismic properties of the xenoliths at PT conditions obtained from geothermobarometry, and were compared to field geophysical data reported from the literature. The velocity of P-waves (7.9 km/s) obtained for a direction corresponding to the existing seismic transect is in good agreement with the most recent geophysical interpretation. Our results are consistent with a roughly W-E oriented fastest P-wave propagation direction in the uppermost mantle beneath the Canary Islands, and with the lithosphere structure proposed by previous authors involving a crust-mantle boundary at around 18 km in depth, overlaid by intermediate material between 11 and 18 km.

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Section: Geological Backgroundmentioning

confidence: 99%

Seismic properties of the upper mantle beneath Lanzarote (Canary Islands): Model predictions based on texture measurements by EBSD

et al. 2006

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“…It forms the emergent part of the socalled East Canary Ridge (ECR), a NNE-SSW linear volcanic structure located on atypical oceanic crust, at least 11 km thick (Banda et al, 1981), lying between the continental rise and the Canary Basin. The geological evolution of Lanzarote involves two main stages: the first pre-erosional during the Miocene-Pliocene and the second -divided into two periods of volcanic activity -post-erosional during the Quaternary (Marinoni and Pasquaré, 1994).…”

Section: Lanzarote: Geological Contextmentioning

confidence: 99%

QVAST: a new Quantum GIS plugin for estimating volcanic susceptibility

Bartolini

Cappello

Martı́

et al. 2013

Nat. Hazards Earth Syst. Sci.

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Abstract. One of the most important tasks of modern volcanology is the construction of hazard maps simulating different eruptive scenarios that can be used in risk-based decision making in land-use planning and emergency management. The first step in the quantitative assessment of volcanic hazards is the development of susceptibility maps (i.e., the spatial probability of a future vent opening given the past eruptive activity of a volcano). This challenging issue is generally tackled using probabilistic methods that use the calculation of a kernel function at each data location to estimate probability density functions (PDFs). The smoothness and the modeling ability of the kernel function are controlled by the smoothing parameter, also known as the bandwidth. Here we present a new tool, QVAST, part of the open-source geographic information system Quantum GIS, which is designed to create user-friendly quantitative assessments of volcanic susceptibility. QVAST allows the selection of an appropriate method for evaluating the bandwidth for the kernel function on the basis of the input parameters and the shapefile geometry, and can also evaluate the PDF with the Gaussian kernel. When different input data sets are available for the area, the total susceptibility map is obtained by assigning different weights to each of the PDFs, which are then combined via a weighted summation and modeled in a non-homogeneous Poisson process. The potential of QVAST, developed in a free and user-friendly environment, is here shown through its application in the volcanic fields of Lanzarote (Canary Islands) and La Garrotxa (NE Spain).

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“…추상 암상군은 스코틀 랜드의 스카이 섬에서 최초로 기재되고 해석되었으며 (Anderson, 1936), 그 후에 이 암상군은 영국, 일본, 아이슬랜드를 포함하여 다른 조구조 환경의 많은 지 역에서 기재되어 왔다 (Chevallier and Verwoerd, 1988;Takada, 1988;Gudmundsson, 1990). 해양도에서 암 맥군의 일부는 이 암상군과 매우 유사한 것도 많이 보고되었다 (Walker, 1992;Marinoni and Pasquare, 1994;Marinoni and Gudmundsson, 2000). 이 암상 군은 대부분 중앙화산에 조합되어 산출된다 (Walker, 1992 (Fig.…”

Section: 에 따라서 지역적으로 서로 분리되어 여러 개의 화산 지역(Volcanic Field)을 형성한다 경상분지는unclassified

Pattern and Origin of the Rhyolitic Dike Swarm, Northeastern Cheongsong, Korea

Hwang¹,

Kwon²,

Seo³

2015

The Journal of the Petrological Society of Korea

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Jungtaesan and Galpyeongji intrusions in the northeastern Cheongsong occur as laccolith and stock which intrude Gasongdong Formation and Dogyedong Formation, respectively. Cheongsong dike swarm, intruding the Dogyedong Formation, is closely associated with this stock. The dike swarm is more radial to focus into Galpyeongji and its outline is oval. The dikes of the dike swarm are only rhyolite dikes with flow banded, spherulitic and rare stony structures, and represents a single intrusive phase of magma. It can be interpretated that orientation of the dikes is controlled by stress states. Therefore, the dikes display a radial pattern through occupying vertical joints that have been generally attributed to radial fractures formed during doming of the sedimentary rocks by the intrusion of the Galpyeongji stock. The dike pattern could sufficiently account for dike injections into these joints.

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Tectonic evolution of the emergent part of a volcanic ocean island: Lanzarote, Canary Islands

Cited by 57 publications

References 49 publications

Seismic properties of the upper mantle beneath Lanzarote (Canary Islands): Model predictions based on texture measurements by EBSD

Seismic properties of the upper mantle beneath Lanzarote (Canary Islands): Model predictions based on texture measurements by EBSD

QVAST: a new Quantum GIS plugin for estimating volcanic susceptibility

Pattern and Origin of the Rhyolitic Dike Swarm, Northeastern Cheongsong, Korea

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