Venus`s shield terrain - University of Minnesota Duluth
... includes ~10,000,000 km2 of lowlands, is bounded to the south by crustal plateaus Ovda and Thetis regions, and to the west, north, and east by planitiae (Fig. 1). The map area includes Niobe, Sogolon, and Llorona planitiae, eastern Ovda Regio, and Haasttse-baad and Gegutte tesserae (Fig. 2). The div ...
... includes ~10,000,000 km2 of lowlands, is bounded to the south by crustal plateaus Ovda and Thetis regions, and to the west, north, and east by planitiae (Fig. 1). The map area includes Niobe, Sogolon, and Llorona planitiae, eastern Ovda Regio, and Haasttse-baad and Gegutte tesserae (Fig. 2). The div ...
VIRTUAL FIELD TRIP
... A volcano is a vent or ‘chimney’ that connects molten rock(magma) to the Earth Surface. It includes the surrounding cone of built-in materials. ...
... A volcano is a vent or ‘chimney’ that connects molten rock(magma) to the Earth Surface. It includes the surrounding cone of built-in materials. ...
calcalk13
... observed in the early development of immature oceanic volcanic arcs as well as volcanoes associated with zones of rifting along the arc, and both tholeiitic and alkaline volcanoes can be found in arcs, commonly spatially associated with fracture zones in the subducting plate. It is important to reme ...
... observed in the early development of immature oceanic volcanic arcs as well as volcanoes associated with zones of rifting along the arc, and both tholeiitic and alkaline volcanoes can be found in arcs, commonly spatially associated with fracture zones in the subducting plate. It is important to reme ...
Epithermal gold-copper mineralization associated with Late
... metal dispersal and thus preclude porphyry style mineralization. Crystallization in the underlying subvolcanic intrusion took place after volcanism terminated when the overlying edifice was at fumarolic stage. At this stage the volatile content of underlying magma reservoir decreased and thus volati ...
... metal dispersal and thus preclude porphyry style mineralization. Crystallization in the underlying subvolcanic intrusion took place after volcanism terminated when the overlying edifice was at fumarolic stage. At this stage the volatile content of underlying magma reservoir decreased and thus volati ...
Validation of OMI L2 Sulfur Dioxide retrievals over volcanic
... coincident SO2 measurements. The only constraint is that, due to interference from water vapor in the 7.3 µm waveband used to retrieve SO2 column abundance from AIRS measurements, AIRS usually only detects volcanic SO2 in the upper troposphere and lower stratosphere (UTLS) or above. We have assembl ...
... coincident SO2 measurements. The only constraint is that, due to interference from water vapor in the 7.3 µm waveband used to retrieve SO2 column abundance from AIRS measurements, AIRS usually only detects volcanic SO2 in the upper troposphere and lower stratosphere (UTLS) or above. We have assembl ...
Petrogenesis and correlation of the mid
... caldera may be related to these Sawatch calderas to the north, as it is aligned with them along the western edge of the Rio Grande rift. This rift was beginning to form ~30 Ma, just after the eruption of the UBT. This puts the UBT at a time of transition from the earlier compressional tectonic regim ...
... caldera may be related to these Sawatch calderas to the north, as it is aligned with them along the western edge of the Rio Grande rift. This rift was beginning to form ~30 Ma, just after the eruption of the UBT. This puts the UBT at a time of transition from the earlier compressional tectonic regim ...
Origin and Evolution of the Western Snake River Plain
... The other terrane is the western SRP, a northwesttrending structural graben bounded by en echelon normal faults and filled with sediment up to 1.7 km thick (Malde, 1959, 1991; Malde and others, 1963; Mabey, 1976, 1982; Leeman, 1982). Sedimentary deposits in the western SRP range in age from Miocene ...
... The other terrane is the western SRP, a northwesttrending structural graben bounded by en echelon normal faults and filled with sediment up to 1.7 km thick (Malde, 1959, 1991; Malde and others, 1963; Mabey, 1976, 1982; Leeman, 1982). Sedimentary deposits in the western SRP range in age from Miocene ...
Igneous Rocks - Home - KSU Faculty Member websites
... crystals may settle to the bottom of the magma chamber. This would produce a rock type at the bottom of the magma chamber that is dominated by early-formed minerals such as olivine, pyroxene, and calcic plagioclase Crystallized minerals have a density greater than the magma and settle to the bottom ...
... crystals may settle to the bottom of the magma chamber. This would produce a rock type at the bottom of the magma chamber that is dominated by early-formed minerals such as olivine, pyroxene, and calcic plagioclase Crystallized minerals have a density greater than the magma and settle to the bottom ...
Geologic mapping of the Chaac-Camaxtli region of Io from Galileo
... This indicates that crustal thickness variations influence magma access to the surface. Surface changes in this region since the Voyager flybys (1979) are relatively minor (additional bright and dark flows, color changes), although several active vents have migrated within paterae. This observation, ...
... This indicates that crustal thickness variations influence magma access to the surface. Surface changes in this region since the Voyager flybys (1979) are relatively minor (additional bright and dark flows, color changes), although several active vents have migrated within paterae. This observation, ...
rifting of the plate boundary in north iceland 1975-1978
... period of 100 to 150 years. During each active period, which probably lasts 5 to 20 years, only one central volcano and fissure swarm is active (Bjornsson et al. 1977). The Krafla fissure swarm, which is presently active, extends from the Tjornes Fracture Zone in the Axarfjordur bay in the north and ...
... period of 100 to 150 years. During each active period, which probably lasts 5 to 20 years, only one central volcano and fissure swarm is active (Bjornsson et al. 1977). The Krafla fissure swarm, which is presently active, extends from the Tjornes Fracture Zone in the Axarfjordur bay in the north and ...
Complex circular subsidence structures in tephra deposited on large
... deposits. The Varða tuff cone is thus a hydromagmatic centre in which eruptions were very ...
... deposits. The Varða tuff cone is thus a hydromagmatic centre in which eruptions were very ...
EN CRACK`N OPEN GEODES
... One of the most beautiful varieties of quartz found in geodes is amethyst. Amethyst is often present in volcanic rocks; accumulated in small pyramidal clusters. It is commonly used in jewelry for its brightness and characteristic purple color which comes from traces of iron. Legend has it, Amethyst ...
... One of the most beautiful varieties of quartz found in geodes is amethyst. Amethyst is often present in volcanic rocks; accumulated in small pyramidal clusters. It is commonly used in jewelry for its brightness and characteristic purple color which comes from traces of iron. Legend has it, Amethyst ...
View paper
... Figure 6 shows the same data as figure 5, except that the samples are further divided into basalt lavas, hyaloclastites and intrusions. Hyaloclastites show by far the greatest dispersion. The data points on the low alteration side and showing more than 10 % “micro-porosity” are hyaloclastic tuffs an ...
... Figure 6 shows the same data as figure 5, except that the samples are further divided into basalt lavas, hyaloclastites and intrusions. Hyaloclastites show by far the greatest dispersion. The data points on the low alteration side and showing more than 10 % “micro-porosity” are hyaloclastic tuffs an ...
Igneous Rocks
... –Phaneritic texture consisting of pyroxene and calcium-rich plagioclase –Makes up a significant percentage of the oceanic crust, beneath the basalt pillow lavas. ...
... –Phaneritic texture consisting of pyroxene and calcium-rich plagioclase –Makes up a significant percentage of the oceanic crust, beneath the basalt pillow lavas. ...
Igneous Rocks
... – Designated as being mafic (magnesium and ferrum, for iron) in composition – Much denser than granitic rocks - sinks – Comprises the ocean floor as well as many volcanic islands such as Hawaii. Also rift valley lavas ...
... – Designated as being mafic (magnesium and ferrum, for iron) in composition – Much denser than granitic rocks - sinks – Comprises the ocean floor as well as many volcanic islands such as Hawaii. Also rift valley lavas ...
Silicic Magmatism and the Volcanic–Plutonic Connection
... Representative silicic rocks from western North America. (A) Aerial view to the south of the Mono Craters, a series of rhyolite and dacite domes erupted mostly from about 40,000 to 600 years ago. These domes were erupted onto a surface largely composed of Bishop Tuff, a >600 km3 rhyolite ignimbrite ...
... Representative silicic rocks from western North America. (A) Aerial view to the south of the Mono Craters, a series of rhyolite and dacite domes erupted mostly from about 40,000 to 600 years ago. These domes were erupted onto a surface largely composed of Bishop Tuff, a >600 km3 rhyolite ignimbrite ...
Annex 2：Geological Heritage
... During 270,000 to 90,000 years, gigantic pyroclastic flow eruptions of andesitic to rhyolitic magma occurred four times in the volcanic field and formed the Aso caldera, 25 km north-south and 18 km east-west. Basement rocks of Aso volcanoes consist of Quaternary Pre-Aso volcanic rocks, Cretaceous gr ...
... During 270,000 to 90,000 years, gigantic pyroclastic flow eruptions of andesitic to rhyolitic magma occurred four times in the volcanic field and formed the Aso caldera, 25 km north-south and 18 km east-west. Basement rocks of Aso volcanoes consist of Quaternary Pre-Aso volcanic rocks, Cretaceous gr ...
The `rings of fire` and thyroid cancer
... Leonidas H. Duntas1, Christos Doumas2 Endocrine Unit, Evgenidion Hospital, University of Athens, Medical School, Athens, Greece, 2Professor of Archeology, University of Athens, Greece ...
... Leonidas H. Duntas1, Christos Doumas2 Endocrine Unit, Evgenidion Hospital, University of Athens, Medical School, Athens, Greece, 2Professor of Archeology, University of Athens, Greece ...
Abstract
... euhedral, fresh-looking, black hornblende phenocrysts up to 2 cm in length. This variety of granodiorite typifies intermediate-age hornblende-phyric units of Cretaceous nested plutonic suites in the Sierra Nevada batholith. Although only inclusions of feldspar are evident in hand samples, the phenoc ...
... euhedral, fresh-looking, black hornblende phenocrysts up to 2 cm in length. This variety of granodiorite typifies intermediate-age hornblende-phyric units of Cretaceous nested plutonic suites in the Sierra Nevada batholith. Although only inclusions of feldspar are evident in hand samples, the phenoc ...
Acid pyroclastic rocks from the Sheinovets caldera, Eastern
... exposed parts of the pyroclastic unit and is covered by its upper levels. The pyroclastic unit is divided into 2 packets: lower, pumice tuff packet and upper, lithic breccia one. The lower packet consists mainly of zeolitized ash and lapilli-tuffs with some breccia levels. These rocks are massive, u ...
... exposed parts of the pyroclastic unit and is covered by its upper levels. The pyroclastic unit is divided into 2 packets: lower, pumice tuff packet and upper, lithic breccia one. The lower packet consists mainly of zeolitized ash and lapilli-tuffs with some breccia levels. These rocks are massive, u ...
Reassessment of the historical seismic activity with major impact on
... volcanoes with caldera (Sete Cidades, Fogo and Furnas) emplaced in the intersection of the NW–SE to WNW–ESE regional faults with an E–W deep fault system thought to be a relic of a MAR transform fault (Queiroz, 1997) (Fig. 2). N–S and NE–SW faults also occur in this context. Several cinder cones ali ...
... volcanoes with caldera (Sete Cidades, Fogo and Furnas) emplaced in the intersection of the NW–SE to WNW–ESE regional faults with an E–W deep fault system thought to be a relic of a MAR transform fault (Queiroz, 1997) (Fig. 2). N–S and NE–SW faults also occur in this context. Several cinder cones ali ...
Chapter 4 - Igneous Rocks
... (geothermal gradient) average between 20oC to 30oC per kilometer of depth – Rocks in the lower crust and upper mantle are near their melting points – Any additional heat may induce melting ...
... (geothermal gradient) average between 20oC to 30oC per kilometer of depth – Rocks in the lower crust and upper mantle are near their melting points – Any additional heat may induce melting ...
rock
... Role of volatiles »Volatiles (primarily water) cause rocks to melt at lower temperatures »This is particularly important where oceanic lithosphere descends into the mantle ...
... Role of volatiles »Volatiles (primarily water) cause rocks to melt at lower temperatures »This is particularly important where oceanic lithosphere descends into the mantle ...
Geology and Geothermal Systems in the Bajawa Volcanic Rift Zone
... not found on the Welas anticline in the area of Fig. 4. However, a major part of this en echelon element is extending to the western outside of Fig. 4 and several Quaternary volcanoes are known (Nasution et al., 2002). Particularly, they includes Ranakah volcanoes south of Ruten City where the Direc ...
... not found on the Welas anticline in the area of Fig. 4. However, a major part of this en echelon element is extending to the western outside of Fig. 4 and several Quaternary volcanoes are known (Nasution et al., 2002). Particularly, they includes Ranakah volcanoes south of Ruten City where the Direc ...
Mount Edziza volcanic complex
The Mount Edziza volcanic complex is a large and potentially active north-south trending complex volcano in Stikine Country, northwestern British Columbia, Canada, located 38 kilometres (24 mi) southeast of the small community of Telegraph Creek. It occupies the southeastern portion of the Tahltan Highland, an upland area of plateau and lower mountain ranges, lying east of the Boundary Ranges and south of the Inklin River, which is the east fork of the Taku River. As a volcanic complex, it consists of many types of volcanoes, including shield volcanoes, calderas, lava domes, stratovolcanoes, and cinder cones.Most of the Mount Edziza volcanic complex is encompassed within a large provincial park called Mount Edziza Provincial Park. Named after Mount Edziza, this 2,660.95 km2 (1,027.40 sq mi) park was established in 1972 to preserve the volcanic and cultural treasures unique to the northern British Columbia area. The Mount Edziza volcanic complex is remote, and, without roads, accessible only along trails. The easiest access is from Highway 37 and a spur road from Dease Lake to Telegraph Creek. From Kinaskan Lake, on Highway 37, a poorly maintained trail extends west for 30 kilometres (19 mi) into the heart of the complex. From Telegraph Creek another trail extends east for 25 kilometres (16 mi) to the north slope of Mount Edziza.