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Bella Bella And Gale Passage Dike Swarms
The Bella Bella and Gale Passage dike swarms are two parallel dike swarms on the Central Coast of British Columbia, Canada. They range in age from 14.5 to 12.5 million years old. They are both chemically bimodal, consisting of rocks such as basalt, trachyte and comendite. They form the westernmost extent of the Anahim Volcanic Belt on Athlone Island, Dufferin Island and Denny Island. The Bella Bella and Gale Passage dike swarms are petrographically similar to the shield complexes in the central Anahim Volcanic Belt. As a result, the swarms are thought to represent the roots of a peralkaline magma system in which they are the magma conduits connecting the underlying magma chamber to the volcanic centre at the surface, which has been extensively eroded to remnants of eruptive breccia Breccia () is a rock composed of large angular broken fragments of minerals or rocks cemented together by a fine-grained matrix. The word has its origins in the Italian language, in whi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anahim Volcanic Belt-en
Anahim is a name used for several features in British Columbia, Canada, derived from the name of Chief Anahim, a leader of the Tsilhqot'in people in the mid-19th Century: *Anahim Lake, British Columbia, a community in the west-central part of the province * Anahim Lake Airport, the airport of the community of Anahim Lake *Anahim Peak, a volcano in the Anahim Volcanic Belt *Anahim hotspot, an inferred mantle plume feeding the Anahim Volcanic Belt *Anahim Volcanic Belt The Anahim Volcanic Belt (AVB) is a west–east trending chain of volcanoes and related magmatic features in British Columbia, Canada. It extends from Athlone Island on the Central Coast, running eastward through the strongly uplifted and deeply ..., a linear belt of volcanoes Various Indian Reserves of the Tl'etinqox-t'in Government are named Anahim No. 10, Anahim No. 11 etc. Their main reserve community is known by a variant name, Anaham. {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dufferin Island
Dufferin Island is an island on the Central Coast of British Columbia, Canada, on the south side of Seaforth Channel just northwest of Bella Bella. It was named in 1876 by Captain Chatfield and the officers of HMS Amethyst after Frederick Hamilton-Temple-Blackwood. Dufferin Island is part of a volcanic area called the Milbanke Sound Group which includes several monogenetic cinder cones. Holocene basalt Basalt (; ) is an aphanite, aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the planetary surface, surface of a terrestrial ...ic lava flows from Dufferin Island overlie adjacent beach deposits. References Islands of British Columbia Central Coast of British Columbia {{BritishColumbiaCoast-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dike Swarms
Dyke (UK) or dike (US) may refer to: General uses * Dyke (slang), a slang word meaning "lesbian" * Dike (geology), a subvertical sheet-like intrusion of magma or sediment * Dike (mythology), ''Dikē'', the Greek goddess of moral justice * Dikes, diagonal pliers, also called side-cutting pliers, a hand tool used by electricians and others * Dyke (automobile company), established 1899 Structures * Dyke (embankment) or dike, a natural or artificial slope or wall to regulate water levels, often called a levee in American English * Ditch, a water-filled drainage trench * A regional term for a dry stone wall People * Dyke (surname) * Dyke baronets, a title in the Baronetage of England * Dykes (surname), a British surname found particularly in northern England Places Settlements * Dike, Iowa, United States * Dykes, Missouri, United States * Dyke, Moray, Scotland * Dike, Texas, United States * Dyke, Virginia, United States * Dyke, Lincolnshire, England * Little Dyke, Nova Scotia, C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Breccia
Breccia () is a rock composed of large angular broken fragments of minerals or rocks cemented together by a fine-grained matrix. The word has its origins in the Italian language, in which it means "rubble". A breccia may have a variety of different origins, as indicated by the named types including sedimentary breccia, tectonic breccia, igneous breccia, impact breccia, and hydrothermal breccia. A megabreccia is a breccia composed of very large rock fragments, sometimes kilometers across, which can be formed by landslides, impact events, or caldera collapse. Types Breccia is composed of coarse rock fragments held together by cement or a fine-grained matrix. Like conglomerate, breccia contains at least 30 percent of gravel-sized particles (particles over 2mm in size), but it is distinguished from conglomerate because the rock fragments have sharp edges that have not been worn down. These indicate that the gravel was deposited very close to its source area, since otherwise th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magma Chamber
A magma chamber is a large pool of liquid rock beneath the surface of the Earth. The molten rock, or magma, in such a chamber is less dense than the surrounding country rock, which produces buoyant forces on the magma that tend to drive it upwards. If the magma finds a path to the surface, then the result will be a volcanic eruption; consequently, many volcanoes are situated over magma chambers. These chambers are hard to detect deep within the Earth, and therefore most of those known are close to the surface, commonly between 1 km and 10 km down. Dynamics of magma chambers Magma rises through cracks from beneath and across the crust because it is less dense than the surrounding rock. When the magma cannot find a path upwards it pools into a magma chamber. These chambers are commonly built up over time, by successive horizontal or vertical magma injections. Influx of new magma causes reaction of pre-existing crystals and the pressure in the chamber to increase. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peralkaline
Peralkaline rocks include those igneous rocks which have a deficiency of aluminium such that sodium and potassium are in excess of that needed for feldspar. The presence of aegerine (sodium pyroxene) and riebeckite (sodium amphibole) are indicative of peralkaline conditions. Examples are the peralkaline rhyolites, comendite and pantellerite, with comendite being the more felsic (silica-rich) rock. Another example is the peralkaline granite that forms the islet of Rockall in the North Atlantic Ocean. Peralkaline rocks are indicative of continental rift-related volcanicity (e.g. the peralkaline rhyolites of the East African Rift in central Kenya) as well as continental and oceanic hotspot volcanicity (e.g. the peralkaline rhyolites of the Glass House Mountains in eastern Australia and the Canary Islands in the Atlantic Ocean). Peralkaline rocks related to subduction zone volcanicity have also been reported (e.g. Sardinia in Italy). Peralkaline magmas likely form when fractional crys ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shield Volcano
A shield volcano is a type of volcano named for its low profile, resembling a warrior's shield lying on the ground. It is formed by the eruption of highly fluid (low viscosity) lava, which travels farther and forms thinner flows than the more viscous lava erupted from a stratovolcano. Repeated eruptions result in the steady accumulation of broad sheets of lava, building up the shield volcano's distinctive form. Shield volcanoes are found wherever fluid low-silica lava reaches the surface of a rocky planet. However, they are most characteristic of ocean island volcanism associated with hot spots or with continental rift volcanism. They include the largest volcanoes on earth, such as Tamu Massif and Mauna Loa. Giant shield volcanoes are found on other planets of the Solar System, including Olympus Mons on Mars and Sapas Mons on Venus. Etymology The term 'shield volcano' is taken from the German term ''Schildvulkan'', coined by the Austrian geologist Eduard Suess in 1888 an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petrographically
Petrography is a branch of petrology that focuses on detailed descriptions of rocks. Someone who studies petrography is called a petrographer. The mineral content and the textural relationships within the rock are described in detail. The classification of rocks is based on the information acquired during the petrographic analysis. Petrographic descriptions start with the field notes at the outcrop and include macroscopic description of hand specimens. The most important petrographer's tool is the petrographic microscope. The detailed analysis of minerals by optical mineralogy in thin section and the micro-texture and structure are critical to understanding the origin of the rock. Electron microprobe or atom probe tomography analysis of individual grains as well as whole rock chemical analysis by atomic absorption, X-ray fluorescence, and laser-induced breakdown spectroscopy are used in a modern petrographic lab. Individual mineral grains from a rock sample may also be analyzed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NRC Research Press
Canadian Science Publishing (CSP) is Canada's largest publisher of international scientific journals. It started in 1929 as the ''NRC Research Press'', part of the National Research Council (NRC). In 2010, the organization spun off from NRC and was incorporated as a not-for-profit. As of 2018, CSP has published about 2,300 articles annually in 24 journals distributed to over 125 countries. CSP has 50 staff members, and, according to the website Owler, its annual revenue is about US$3.7M. All of CSP's journals are produced and delivered in both HTML and PDF formats, is connected to scientific literature, included in all major indexes, and archived through both CLOCKSS and Portico. Open access CSP has an ''OpenArticle'' program, which permits authors and/or research funding agencies to sponsor online open access of their article. It also has auto-deposit of accepted manuscripts into the University of Toronto ''TSpace'', a free and secure research repository; and an adoption ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canadian Journal Of Earth Sciences
The ''Canadian Journal of Earth Sciences'' is a monthly peer-reviewed scientific journal established in 1963, which reports current research on all aspects of the Earth sciences. It is published by NRC Research Press. The journal also publishes special issues that focus on information and studies limited in scope to a specific segment of the Earth sciences. The editor-in-chief is Dr. Brendan Murphy (St. Francis Xavier University) and Sally Pehrsson (University of Saskatchewan). According to the ''Journal Citation Reports'', the journal has a 2020 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as ... of 1.369. References External links * {{Authority control Earth and atmospheric sciences journals Monthly journals Publications established in 1963 Canadian Scie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Denny Island (Canada)
Denny Island is an island on the Central Coast of British Columbia, Canada, just east of the community of Bella Bella, aka Waglisla, on Campbell Island. Denny Island is the location of Old Bella Bella, now mainly abandoned but home to Canadian Coast Guard and Fisheries & Oceans bases, and the locality of Shearwater, home to Shearwater Marine. Denny Island has a population of 138. Denny Island's shining glory is the McEmery Aquatic Centre located on Reservoir Lane. Name origin See also *Bella Bella and Gale Passage dike swarms * Denny Island (Monmouthshire, Wales) *Denny Island, a small island in the Chew Valley Lake (Somerset, England) *Great Bear Rainforest The Great Bear Rainforest is a temperate rain forest on the Pacific coast of British Columbia, Canada comprising 6.4 million hectares. It is part of the larger Pacific temperate rainforest ecoregion, which is the largest coastal temperate rain ... References External linksWeb Page of Denny Island, British Columbia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Athlone Island
Athlone (; ) is a town on the border of County Roscommon and County Westmeath, Ireland. It is located on the River Shannon near the southern shore of Lough Ree. It is the second most populous town in the Midlands Region with a population of 21,349 in the 2016 census. Most of the town lies on the east bank of the river, within the townland of the same name; however, by the terms of the Local Government Act of 1898, six townlands on the west bank of the Shannon, formerly in County Roscommon, were incorporated into the town, and consequently, into the county of Westmeath. Around 100 km west of Dublin, Athlone is near the geographical centre of Ireland, which is north-northwest of the town, in the area of Carnagh East in County Roscommon. History Athlone Castle, situated on the western bank of the River Shannon, is the geographical and historical centre of Athlone. Throughout its early history, the ford of Athlone was strategically important, as south of Athlone the Shannon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
