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Lake Temagami Access Road
The Temagami Greenstone Belt (TGB) is a small 2.7 billion year old greenstone belt in the Temagami region of Northeastern Ontario, Canada. It represents a feature of the Superior craton, an ancient and stable part of the Earth's lithosphere that forms the core of the North American continent and Canadian Shield. The belt is composed of metamorphosed volcanic rocks that range in composition from basalt to rhyolite. These form the east-northeast trend of the belt and are overlain by metamorphosed sedimentary rocks. They were created during several volcanic episodes involving a variety of eruptive styles ranging from passive lava eruptions to viscous explosive eruptions. Part of the Canadian Shield, the TGB contains some of the oldest known rocks on Earth. The belt is made up of a number of geologic features such as batholiths, stocks, dikes, volcanic complexes, layered intrusions and deformation zones. These are situated in several geographical townships in the municipality of ... [...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] |
Explosive Eruption
In volcanology, an explosive eruption is a volcanic eruption of the most violent type. A notable example is the 1980 eruption of Mount St. Helens. Such eruptions result when sufficient gas has dissolved under pressure within a viscous magma such that expelled lava violently froths into volcanic ash when pressure is suddenly lowered at the vent. Sometimes a lava plug will block the conduit to the summit, and when this occurs, eruptions are more violent. Explosive eruptions can expel as much as per second of rocks, dust, gas and pyroclastic material, averaged over the duration of eruption, that travels at several hundred meters per second as high as into the atmosphere. This cloud may subsequently collapse, creating a fast-moving pyroclastic flow of hot volcanic matter. Stages of an explosive eruption An explosive eruption begins with some form of blockage in the crater of a volcano that prevents the release of gases trapped in highly viscous andesitic or rhyolitic magma. The pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magma
Magma () is the molten or semi-molten natural material from which all igneous rocks are formed. Magma is found beneath the surface of the Earth, and evidence of magmatism has also been discovered on other terrestrial planets and some natural satellites. Besides molten rock, magma may also contain suspended crystals and gas bubbles. Magma is produced by melting of the mantle or the crust in various tectonic settings, which on Earth include subduction zones, continental rift zones, mid-ocean ridges and hotspots. Mantle and crustal melts migrate upwards through the crust where they are thought to be stored in magma chambers or trans-crustal crystal-rich mush zones. During magma's storage in the crust, its composition may be modified by fractional crystallization, contamination with crustal melts, magma mixing, and degassing. Following its ascent through the crust, magma may feed a volcano and be extruded as lava, or it may solidify underground to form an intrusion, such as a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tectonism
Tectonics (; ) are the processes that control the structure and properties of the Earth's crust and its evolution through time. These include the processes of mountain building, the growth and behavior of the strong, old cores of continents known as cratons, and the ways in which the relatively rigid plates that constitute the Earth's outer shell interact with each other. Tectonics also provide a framework for understanding the earthquake and volcanic belts that directly affect much of the global population. Tectonic studies are important as guides for economic geologists searching for fossil fuels and ore deposits of metallic and nonmetallic resources. An understanding of tectonic principles is essential to geomorphologists to explain erosion patterns and other Earth surface features. Main types of tectonic regime Extensional tectonics Extensional tectonics is associated with the stretching and thinning of the crust or the lithosphere. This type of tectonics is fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Best Township, Ontario
Best Township is a geographic township comprising a portion of the municipality of Temagami in Nipissing District, Northeastern Ontario, Canada. It is used for geographic purposes, such as land surveying and natural resource explorations. Neighbouring geographic townships include Gillies Limited Township to the north, Banting Township to the west, Chambers Township to the southwest, and Strathy and Cassels townships to the south. Localities * Rib Lake *James Lake *Northland Pyrite Mine The Northland Pyrite Mine, also known as James Lake Mine, Rib Lake Mine, Harris Mine or simply Northland Mine, is an abandoned underground mine in Northeastern Ontario, Canada, located on the southwestern shore of James Lake in Best Township of Te ... Notes References * * * Townships of Temagami {{NorthernOntario-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Briggs Township, Ontario
Briggs Township is a geographic township comprising a portion of the municipality of Temagami in Northeastern Ontario, Canada. It is used for geographic purposes, such as land surveying and natural resource Natural resources are resources that are drawn from nature and used with few modifications. This includes the sources of valued characteristics such as commercial and industrial use, aesthetic value, scientific interest and cultural value. ... explorations. Neighbouring geographic townships include Chambers Township, Joan Township and Strathcona Township. Notes References * * * Townships of Temagami {{NorthernOntario-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strathcona Township, Ontario
Strathcona Township is a geographic township comprising a portion of the municipality of Temagami in Northeastern Ontario, Canada. It is used for geographic purposes, such as land surveying and natural resource explorations. A portion of the northeast arm of Lake Temagami lies at its northwestern corner. Neighbouring geographic townships include Strathy Township, Chambers Township, Briggs Township Briggs Township is a geographic township comprising a portion of the municipality of Temagami in Northeastern Ontario, Canada. It is used for geographic purposes, such as land surveying and natural resource Natural resources are resources ..., Riddle Township and Cassels Township. Notes References * * * {{NorthernOntario-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strathy Township
Strathy Township is a square-shaped geographic township comprising a portion of the municipality of Temagami in Northeastern Ontario, Canada. It is used for geographic purposes, such as land surveying and natural resource explorations. At least four other geographic townships surround Strathy Township, namely Best Township, Cassels Township, Strathcona Township and Chambers Township. Features and localities * Arsenic Lake *Beanland Mine *Big Dan Mine * Big Dan Shear Zone * Caribou Lake * Caribou Mountain *Chambers-Strathy Batholith *Hermiston-McCauley Mine * Johnny Creek * Kanichee layered intrusive complex *Kanichee Mine *Lake Temagami *Leckie Mine * Link Lake *Link Lake Deformation Zone *Milne-Sherman Road *Milne Townsite *Net Lake *Net Lake-Vermilion Lake Deformation Zone *Sherman Mine *Sherman volcano *Snake Island Lake *Temagami *Temagami North *Temagami Greenstone Belt The Temagami Greenstone Belt (TGB) is a small 2.7 billion year old greenstone belt in the Temagami ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chambers Township, Ontario
Chambers Township is a square-shaped Township (Canada)#Ontario, geographic township comprising a portion of the municipality of Temagami in Nipissing District, Northeastern Ontario, Northeastern Ontario, Canada. It is used for geographic purposes, such as land surveying and natural resource explorations. Neighbouring geographic townships include Strathy Township, Briggs Township, Ontario, Briggs Township, Strathcona Township, Ontario, Strathcona Township, Best Township, Ontario, Best Township and Banting Township. Notes References * * * Townships of Temagami {{NorthernOntario-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Township (Canada)
The term township, in Canada, is generally the district or area associated with a town. The specific use of the term to describe political subdivisions has varied by country, usually to describe a local rural or semirural government within the country itself. In Eastern Canada, a township is one form of the subdivision of a county. In Quebec, the term is ''canton'' in French. Maritimes The historic colony of Nova Scotia (present-day Nova Scotia, New Brunswick, and Prince Edward Island) used the term ''township'' as a subdivision of counties and as a means of attracting settlers to the colony. In Prince Edward Island, the colonial survey of 1764 established 67 townships, known as lots, and 3 royalties, which were grouped into parishes and hence into counties; the townships were geographically and politically the same. In New Brunswick, parishes have taken over as the present-day subdivision of counties, and present-day Nova Scotia uses districts as appropriate. Ontario In Ontar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Layered Intrusion
A layered intrusion is a large sill-like body of igneous rock which exhibits vertical layering or differences in composition and texture. These intrusions can be many kilometres in area covering from around to over and several hundred metres to over in thickness.Blatt, Harvey and Tracy, Robert J. (1996) ''Petrology: Igneous, Sedimentary and Metamorphic,'' 2nd ed., pp. 123–132 & 194–197, Freeman, While most layered intrusions are Archean to Proterozoic in age (for example, the Paleoproterozoic Bushveld complex), they may be any age such as the Cenozoic Skaergaard intrusion of east Greenland or the Rum layered intrusion in Scotland. Although most are ultramafic to mafic in composition, the Ilimaussaq intrusive complex of Greenland is an alkalic intrusion. Layered intrusions are typically found in ancient cratons and are rare but worldwide in distribution. The intrusive complexes exhibit evidence of fractional crystallization and crystal segregation by settling or floating ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Complex
A complex volcano, also called a compound volcano or a volcanic complex, is a mixed landform consisting of related volcanic centers and their associated lava flows and pyroclastic rock. They may form due to changes in eruptive habit or in the location of the principal vent area on a particular volcano. Stratovolcanoes can also form a large caldera that gets filled in by a lava dome, or else multiple small cinder cones, lava domes and craters may develop on the caldera's rim. Although a comparatively unusual type of volcano, they are widespread in the world and in geologic history. Metamorphosed ash flow tuffs are widespread in the Precambrian rocks of northern New Mexico, which indicates that caldera complexes have been important for much of Earth's history. Yellowstone National Park is on three partly covered caldera complexes. The Long Valley Caldera in eastern California is also a complex volcano; the San Juan Mountains in southwestern Colorado are formed on a group of N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
