Stratigraphy, chronology, and paleoenvironmental reconstruction of the Quaternary sedimentary infilling of a volcanic tube in Fuerteventura, Canary Islands
La Cueva del Llano is a volcanic tube of Pleistocene age on Fuerteventura Island, in the Canary Islands. Part of it is infilled with sediments of external origin. These deposits are exceptional in stratigraphic complexity and thickness. The aim
Palaeomagnetic investigation of Cenozoic volcanicrocks bordering the North Anatolian Fault Zone, Reşadiye and Koyulhisar Districts, central-east Anatolia, Turkey
block rotation in this region since Upper Cretaceous times. This study indicates that this was overtaken by clockwise rotation in Eocene times. Results from later Miocene and Pliocene volcanicrocks indicate that no significant tectonic rotation has
A palaeomagnetic study is reported from the lavas of Eocene, Miocene and Pliocene age cropping out immediately to the north of the North Anatolian Fault Zone (NAFZ) in the Reşadiye–Mesudiye region of central-eastern Anatolia. Rock magnetic
investigations identify a high percentage of multi-domained magnetite as the dominant ferromagnet in these rocks. Thirty of 37 units yielded acceptable groupings of characteristic magnetisation directions. An earlier study indicated small anticlockwise crustal
L'Indonésie située sur la Ceinture de Feu du Pacifique dans la zone de collision de 4 plaques (eurasienne, philippine, pacifique et indo-australienne) possède le plus grand nombre de volcans actifs sur Terre. Cependant, l'Indonésie bénéficie plus du
The island of Milos, part of the South Aegean volcanic arc with a typical Mediterranean climate, is covered with volcanic deposits of different ages. The aim of this study was to investigate the physicochemical and mineralogical properties
of the soils developing on these volcanic deposits and their classification. Samples were taken from 7 locations of soil on different parent material and of different ages. These soils do not exhibit andic properties and hence cannot be classified as Andisols
The AA. report new field observations on stratigraphy, sedimentology, and geochemical data of plutonic rocks of the Shyok suture zone separaring the Ladakh terane to the SW from the Karakoram terrane to the NE. Six tectonic units have been
distinguished. The AA. outline the geology along a transect in the Nubra-Shyok river valleys. They describe a thick sedimentary-volcanic succession yielding Middle Cretaceous foraminifera. They also discuss the tectonic implications for regional correlation
The development of interferometric techniques applied to synthetic aperture radar (SAR) data has opened up many new applications for remote sensing. This paper focuses upon the discrimination and mapping of rock and soil types from multispectral
data; the monitoring of volcanic activity, ash cloud, dust trajectories and fluxes; the vegetation monitoring; the forest and environmental management with remote-sensing techniques; the monitoring of lakes, rivers and estuaries from satellite images.
Chemical erosion ; Erosion rate ; Experimentation ; Island ; Japan ; Methodology ; Volcanicrock ; Weathering
To examine the rate of chemical weathering, field experiments using microweight-loss techniques were carried out. Two kinds of porous rhyolite forming lava domes in Kozu-shima Island were selected : a younger rock (weathering period is 2.6 ka
) and an older rock (20ka). Both rocks seem to have been very similar in their initial composition and structure. They have, however, different properties in the present depending on the differences in weathering period. The results show that older rock has
a higher rate of chemical weathering than in younger rock.
The geology of the island is varied, with hard and resistant basalt lavas, breccias and tuffs of intermediate resistance, and highly erodible eolianites. This variability provides an excellent opportunity to examine the influence of rock resistance
on the development of the spectacular rock coast landforms that occur around the island. Relative rock resistance was assessed through a combination of Schmidt hammer data, and statistical analysis was undertaken to remove outlying values. The paper considers
To obtain quickly exact information on rock type boundaries band 4 of a LANDSAT image was applied. The volcanicrocks were separated from Holocene alluvial formations on the interpreted maps of the image.
Drainage network ; Fault ; Indonesia ; Jawa ; Lineament ; Photointerpretation ; Structural geomorphology ; Volcanicrock ; Volcanism
In this study, the geomorphic effect of this fault on the drainage system of the southern volcano slopes is analyzed and related to other phases of faulting, and of volcanic activity, in this zone. The lineaments are analyzed and brought in relation
Relations between tectonics and volcanism in the Roman province, Italy in Tephra studies.
Three regional tectonic phases can be distinguished during the past million years: 1. formation of a large graben, 2. sinking of segments of the volcano complex, 3. faulting, accompanied by phreatomagmatic volcanism. Each event was followed by small
volume eruptions of basic, unevolved potassic magma. Subsequent eruptions produced more differentiated rocks. The tectonic activity created room for magma at shallow level, where crystallization and minor magma mixing took place.
The AA. report tectonic settings and geological features of Patagonia briefly and discuss some structural and geomorphological aspects that could be used to infer directions of magmatic flow of nearly horizontal lavas and to test stability of rock
strength (resistance). The suggested equations describe the volcanic constructions profiles as a function of their height, craters' radius and the volcanicrock properties. The computer calculations results were used to construct theoretical contours
The paper gives the solution of the volcanic islands slope geometry problem which has been obtained within the scope of a mathematical model developed on the basis of the hypothesis by G. F. Becker. The latter assumed volcanoes to be bodies of equal
of volcanic islands. Possible causes of terrace formation on the islands slopes are also discussed, as well as conditions of collapse caldera formation. - (L'Ed.).
Long-term erosion-rate calculation from the Waipiata Volcanic Field (New Zealand) based on erosion remnants of scoria cones, tuff rings and maars
Cenozoic ; Erosion ; Erosion rate ; Maar ; Methodology ; Miocene ; New Zealand ; South Island ; Stratigraphy ; Tectonics ; Tufa ; Volcanicrock ; Volcanism
Après avoir décrit les différentes étapes de l'érosion des cônes de scories, des anneaux de tuf et des maars, l'A. présente le cas exemplaire des vestiges de différents types de volcans dans la Zone Volcanique Waipiata (ZVW), d'âge miocène inférieur
British Columbia ; Canada ; Cold area ; Ice ; Magma ; Meltwater ; Quaternary ; Typology ; Volcanicrock ; Volcanism
Volcanism in association with large quantities of ice manifests itself in a variety of morphological forms developed under differing physical conditions. These physical conditions include the location amount, thickness, and type of confining ice
provides a review of ice-contact volcanism and volcanic products formed in these environments using Canadian examples for illustration.
Batimetría ; Cuaternario ; El Mediterranéo ; Estratigrafía ; Fondo submarino ; Foso tectónico ; Geomorfología submarina ; Grecia ; Mar Egeo ; Neotectónica ; Volcanismo ; Volcán
of hydrothermal activity. Heavy biogenic encrustations cover the volcanicrock outcrops on the flanks of both Yali and Strongyli. Analysis of recovered samples will provide information about their relationship to the geology of the nearby islands.
This paper reports the results of the Remotely Operated Vehicle (ROV) exploration combined with multibeam data, providing new information about the main morphological characteristics of the Nisyros submarine volcanic centres. ROV exploration