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Job Assemblage
The Job Assemblage is a geological formation comprising a portion of the Mount Meager massif in southwestern British Columbia, Canada. It is named after Mount Job, a subsidiary peak of Meager. The rock unit was formed during a period of rhyodacite volcanism during the Pleistocene epoch. Around Mount Job, rhyodacite contains hornblende, biotite and quartz. On the east side of the Affliction Glacier, rhyodacite of the Job Assemblage overlies porphyritic andesite of the older Pylon Assemblage. The more recently formed Capricorn Assemblage overlies the Job Assemblage at the head of Affiction Glacier and Capricorn Glacier. See also *List of Cascade volcanoes *List of volcanoes in Canada *Mosaic Assemblage *Plinth Assemblage *The Devastator Assemblage *Volcanology of Western Canada Volcanism of Western Canada has produced lava flows, lava plateaus Lava is molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Formation
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by Abraham Gottlob Wer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andesite
Andesite () is a volcanic rock of intermediate composition. In a general sense, it is the intermediate type between silica-poor basalt and silica-rich rhyolite. It is fine-grained (aphanitic) to porphyritic in texture, and is composed predominantly of sodium-rich plagioclase plus pyroxene or hornblende. Andesite is the extrusive equivalent of plutonic diorite. Characteristic of subduction zones, andesite represents the dominant rock type in island arcs. The average composition of the continental crust is andesitic. Along with basalts, andesites are a component of the Martian crust. The name ''andesite'' is derived from the Andes mountain range, where this rock type is found in abundance. It was first applied by Christian Leopold von Buch in 1826. Description Andesite is an aphanitic (fine-grained) igneous rock that is intermediate in its content of silica and low in alkali metals. It has less than 20% quartz and 10% feldspathoid by volume, with at least 65% of the fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geologic Formations Of British Columbia
Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology, and so is treated as one major aspect of integrated Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the relative and absolute ages of rocks found in a given location, and also to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, and also to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Earth's past climates. Geologists broadly study the properties and processes of E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanism Of British Columbia
Volcanism, vulcanism or volcanicity is the phenomenon of eruption of molten rock (magma) onto the surface of the Earth or a solid-surface planet or moon, where lava, pyroclastics, and volcanic gases erupt through a break in the surface called a vent. It includes all phenomena resulting from and causing magma within the crust or mantle of the body, to rise through the crust and form volcanic rocks on the surface. Magmas, that reach the surface and solidify, form extrusive landforms. Volcanic processes Magma from the mantle or lower crust rises through the crust towards the surface. If magma reaches the surface, its behavior depends on the viscosity of the molten constituent rock. Viscous (thick) magma produces volcanoes characterised by explosive eruptions, while non-viscous (runny) magma produce volcanoes characterised by effusive eruptions pouring large amounts of lava onto the surface. In some cases, rising magma can cool and solidify without reaching the surface. Instead, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanology Of Western Canada
Volcanism of Western Canada has produced lava flows, lava plateaus Lava is molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or un ..., lava domes, cinder cones, stratovolcanoes, shield volcanoes, Greenstone belt, greenstone belts, submarine volcanoes, calderas, diatremes and maars, along with examples of more less common volcanic forms such as tuyas and subglacial mounds. Volcanic belts * * * * * * * * * External links Erica A. Massey: A Comparative Study of Glaciovolcanic Palagonitization of Tholeitic and Alkaline Sideromelane in Helgafell, Icland, and Wells Gray-Clearwater Volcanic Filed, BC, Canada. B.Sc., The University of British Columbia, 2014 Volcanic fields * * * See also * * * * ReferencesVolcanoes of Canada Volcanism of Western Canada, Geology of British Columbia, . Geolo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Devastator Assemblage
The Devastator Assemblage is a geological formation comprising a portion of the Mount Meager massif in southwestern British Columbia, Canada. It is named after Devastator Peak (also known as The Devastator), the lowest and southernmost subsidiary peak of Meager. The south and west flanks of Pylon Peak and Devastator Peak are made of The Devastator Assemblage rocks. This thick rock unit was formed during a period of volcanic activity between 1,900,000 and 500,000 years ago. It consists of subvolcanic intrusions of a partly preserved volcanic vent and felsic volcanic rocks that were erupted from the vent. The eastern portion of The Devastator Assemblage comprises the partly preserved vent and felsic volcanic rocks while the western portion consists of crudely layered tephra. See also * Capricorn Assemblage *Job Assemblage *List of Cascade volcanoes *List of volcanoes in Canada *Mosaic Assemblage *Plinth Assemblage *Pylon Assemblage *Volcanology of Western Canada Volcani ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plinth Assemblage
The Plinth Assemblage, also known as the Plinth Formation, is an accreted terrane of igneous rocks in southwestern British Columbia, Canada, located just north of the Lillooet River and on the northern flank of the Mount Meager massif. It is named after Plinth Peak, a peak made of Plinth Assemblage rocks. This geological formation is one of the largest comprising the Mount Meager massif. Formed during an onset of volcanic activity about 100,000 years ago, the Plinth Assemblage consists of light grey porphyritic rhyodacite with phenocrysts of plagioclase, quartz, minor biotite and rare hornblende. The of Mount Meager itself is made of Plinth Assemblage rocks and was the southern source of Plinth Assemblage lava flows and breccias. The Plinth Assemblage represents a minor portion of the Pacific Ranges of the southern Coast Mountains. See also *Job Assemblage *Mosaic Assemblage * Capricorn Assemblage *The Devastator Assemblage *Pylon Assemblage *Volcanism of Western Canada *Li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mosaic Assemblage
The Mosaic Assemblage is a rock unit of the Pacific Ranges of the Coast Mountains in southwestern British Columbia, Canada. It is the namesake of Mosaic Glacier, which is drained by Mosaic Creek. This geological formation formed 140,000 to less than 90,000 years ago when porphyritic plagioclase-augite-olivine basalt and trachybasalt was erupted in valleys and on mountain ridges. These volcanic rocks form scoriaceous lava flows, breccias, volcanic bombs and pillow lavas. The location of the Mosaic Assemblage is sparse, being present just north of the Lillooet River, south of and in upper Meager Creek and between Job Creek and Mosaic Creek. Because these four areas are well apart, each area probably has its own volcanic vents. Small patches of the Mosaic Assemblage overlie The Devastator Assemblage and form minor portions of the Mount Meager massif. See also *Job Assemblage *Plinth Assemblage * Capricorn Assemblage *Pylon Assemblage *Volcanism of Western Canada *List of Cas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Volcanoes In Canada
List of volcanoes in Canada is an incomplete list of volcanoes found in Mainland Canada, in the Canadian islands and in Canadian waters. All but one province, Prince Edward Island, have at least one volcano. Alberta British Columbia New Brunswick Newfoundland and Labrador Northwest Territories Nova Scotia Nunavut Ontario Quebec Saskatchewan Yukon See also * Outline of Canada * Bibliography of Canada * Index of Canada-related articles * Volcanism of Canada ** Volcanism of Northern Canada ** Volcanism of Western Canada ** Volcanism of Eastern Canada ** List of Northern Cordilleran volcanoes * List of mountains in Canada * List of Cascade volcanoes External links Catalogue of Canadian Volcanoes {{Canadian volcanism Canada Volcanoes Volcanoes Volcanoes A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Cascade Volcanoes
This is a list of Cascade volcanoes, i.e. volcanoes formed as a result of subduction along the Cascadia subduction zone in the Pacific Northwest of North America. The volcanoes are listed from north to south, by province or state: British Columbia, Washington, Oregon, and California. British Columbia Washington Oregon California See also *List of volcanoes in the United States *List_of_volcanoes_in_Canada.html" ;"title="/[Https://www.sci.news/geology/puhahonu-shield-volcano-08435.html Puhahonu ... *List of volcanoes in Canada">/[Https://www.sci.news/geology/puhahonu-shield-volcano-08435.html Puhahonu ... *List of volcanoes in Canada *Volcanology of Canada *Volcanology of Western Canada *List of Northern Cordilleran volcanoes *Lists of volcanoes Notes References {{Reflist * Cascades Volcanoes Geography of the Pacific Northwest *Cascade Volcanoes Cascade Volcanoes *Cascade Volcanoes Cascade Vo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Capricorn Assemblage
The Capricorn Assemblage, also known as the Capricorn Formation, is a geological formation comprising the central portion of the Mount Meager massif in southwestern British Columbia, Canada. It is named after Capricorn Mountain, the third highest subsidiary peak of Meager. The assemblage was formed during a period of volcanic activity about or less than 90,000 years ago. Weathered rhyodacite is the main volcanic rock comprising the Capricorn Assemblage. It forms the final of Capricorn Mountain and Mount Job. The rhyodacite is characterized by phenocrysts of plagioclase, quartz and biotite. Capricorn Assemblage rhyodacite underlies Plinth Assemblage rhyodacite on the south flank of Plinth Peak. See also *Mosaic Assemblage *Job Assemblage *The Devastator Assemblage *Pylon Assemblage *Volcanism of Western Canada *List of Cascade volcanoes *List of volcanoes in Canada List of volcanoes in Canada is an incomplete list of volcanoes found in Mainland Canada, in the Canadian isla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pylon Assemblage
The Pylon Assemblage is an accreted terrane of igneous rocks in southwestern British Columbia, Canada, located about north of Vancouver. It is named after Pylon Peak, a summit of the Mount Meager massif. Two units make up the Pylon Assemblage, although the youngest unit comprises nearly 100% of the assemblage. On the southern flank of Pylon Peak, the oldest unit consists of andesitic lava flows. It locally overlies The Devastator Assemblage and older basal breccia. Porphyritic plagioclase andesite of the youngest unit underlies much of the southern and western portions of Meager. Devastator Peak, a volcanic plug at the southern end of the Meager massif, was the source for these lava flows between 1,000,000 and 500,000 years ago. The Pylon Assemblage represents the largest geological formation comprising Meager. See also *Mosaic Assemblage *Job Assemblage * Capricorn Assemblage *Plinth Assemblage *Volcanism of Western Canada *List of Cascade volcanoes *List of volcanoes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
