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Iron Quadrangle
The Iron Quadrangle ( pt, Quadrilátero Ferrífero) is a mineral-rich region covering about in the central-southern part of the Brazilian state Minas Gerais. The area is known for its extensive deposits of gold, diamonds, and iron ore, being the source of approximately 40% of all gold produced in Brazil between the years 1500 and 2000. The deposits themselves pertain to the Minas Supergroup, a sequence of meta-sedimentary rocks initially formed in the Paleoproterozoic, about 2.5 Ga. In the 2010s, there have been two collapses of large tailings dams, which caused extensive damage and loss of life. Demographics The Iron Quadrangle is located in the south-central portion of the state of Minas Gerais and is home to more than 4 million people. The largest city in the region, Belo Horizonte, acts as the regional economic hub and processes most of the gem and mineral wealth produced by the region. Other large settlements include Santa Luzia, Minas Gerais, Santa Luzia, Ibirité, and Itab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleoproterozoic
The Paleoproterozoic Era (;, also spelled Palaeoproterozoic), spanning the time period from (2.5–1.6 Ga), is the first of the three sub-divisions (eras) of the Proterozoic Eon. The Paleoproterozoic is also the longest era of the Earth's geological history. It was during this era that the continents first stabilized. Paleontological evidence suggests that the Earth's rotational rate ~1.8 billion years ago equated to 20-hour days, implying a total of ~450 days per year. Atmosphere Before the enormous increase in atmospheric oxygen, almost all existing lifeforms were anaerobic organisms whose metabolism was based on a form of cellular respiration that did not require oxygen. Free oxygen in large amounts is toxic to most anaerobic organisms. Consequently, most died when the atmospheric free oxygen levels soared in an extinction event called the Great Oxidation Event, which brought atmospheric oxygen levels to up to 10% of their current level. The only creatures that survi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ibirité
Ibirité is a Brazilian municipality located in the state of Minas Gerais. The city belongs to the mesoregion Metropolitana de Belo Horizonte and to the microregion of Belo Horizonte. Its population in 2020 was 182,153. History Ibirité was born in 1880 as a village with the name of Pantano de Vargas, in the parish of Sabará. This village was later chosen by Russian educator Helena Antipoff to be the seat of her works, that are still the major reference of the city. In 1890, became the condition of town, still belonging to Sabará. In 1897, became to belong to the municipality of Santa Quitéria, actually known as Esmeraldas. In 1911, the region becomes part of the municipality of Betim. In 1923, has changed its name to Ibiritê, indigenous word which means iron land. In 1938, become a district belonging to the municipality of Betim, already with the actual name. On December 30, 1962, is categorized as a municipality, with the districts Sede and Sarzedo. On March 1, 1963 Chaffi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calc-alkaline Magma Series
The calc-alkaline magma series is one of two main subdivisions of the subalkaline magma series, the other subalkaline magma series being the tholeiitic series. A magma series is a series of compositions that describes the evolution of a mafic magma, which is high in magnesium and iron and produces basalt or gabbro, as it fractionally crystallizes to become a felsic magma, which is low in magnesium and iron and produces rhyolite or granite. Calc-alkaline rocks are rich in alkaline earths ( magnesia and calcium oxide) and alkali metals and make up a major part of the crust of the continents. The diverse rock types in the calc-alkaline series include volcanic types such as basalt, andesite, dacite, rhyolite, and also their coarser-grained intrusive equivalents (gabbro, diorite, granodiorite, and granite). They do not include silica-undersaturated, alkalic, or peralkaline rocks. Geochemical characterization Rocks from the calc-alkaline magma series are distinguished from rocks ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Congo Craton
The Congo Craton, covered by the Palaeozoic-to-recent Congo Basin, is an ancient Precambrian craton that with four others (the Kaapvaal, Zimbabwe, Tanzania, and West African cratons) makes up the modern continent of Africa. These cratons were formed between about 3.6 and 2.0 billion years ago and have been tectonically stable since that time. All of these cratons are bounded by younger fold belts formed between 2.0 billion and 300 million years ago. The Congo Craton occupies a large part of central southern Africa, extending from the Kasai region of the DRC into Sudan and Angola. It forms parts of the countries of Gabon, Cameroon, and the Central African Republic. A small portion extends into Zambia as well, where it is called the Bangweulu Block. Congo–São Francisco The Congo Craton and the São Francisco Craton are stable Archaean blocks that formed a coherent landmass until the opening of the South Atlantic Ocean during the break-up of Gondwana ( 2000–130 Ma). They ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Migmatite
Migmatite is a composite rock found in medium and high-grade metamorphic environments, commonly within Precambrian cratonic blocks. It consists of two or more constituents often layered repetitively: one layer is an older metamorphic rock that was reconstituted subsequently by partial melting ("paleosome"), while the alternate layer has a pegmatitic, aplitic, granitic or generally plutonic appearance ("neosome"). Commonly, migmatites occur below deformed metamorphic rocks that represent the base of eroded mountain chains. Migmatites form under extreme temperature and pressure conditions during prograde metamorphism, when partial melting occurs in metamorphic paleosome. Components exsolved by partial melting are called neosome (meaning ‘new body’), which may or may not be heterogeneous at the microscopic to macroscopic scale. Migmatites often appear as tightly, incoherently folded veins ( ptygmatic folds).Recommendations by the IUGS Subcommission on the Systematics of M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gneiss
Gneiss ( ) is a common and widely distributed type of metamorphic rock. It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. Gneiss forms at higher temperatures and pressures than schist. Gneiss nearly always shows a banded texture characterized by alternating darker and lighter colored bands and without a distinct cleavage. Gneisses are common in the ancient crust of continental shields. Some of the oldest rocks on Earth are gneisses, such as the Acasta Gneiss. Description Orthogneiss from the Czech Republic In traditional English and North American usage, a gneiss is a coarse-grained metamorphic rock showing compositional banding (gneissic banding) but poorly developed schistosity and indistinct cleavage. In other words, it is a metamorphic rock composed of mineral grains easily seen with the unaided eye, which form obvious compositional layers, but which has only a weak tendency to fracture ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lithostratigraphic
Lithostratigraphy is a sub-discipline of stratigraphy, the geology, geological science associated with the study of stratum, strata or rock layers. Major focuses include geochronology, comparative geology, and petrology. In general, strata are primarily igneous or sedimentary relating to how the rock was formed. Sedimentary rock, Sedimentary layers are laid down by Deposition (sediment), deposition of sediment associated with weathering processes, decaying organic matter (biogenic) or through chemical precipitation. These layers are often distinguishable as having many fossils and are important for the study of biostratigraphy. Igneous layers occur as stacks of lava flows, layers of lava fragments (called tephra) both erupted onto the Earth's surface by volcanoes, and in layered intrusions formed deep underground. Igneous layers are generally devoid of fossils and represent Magmatism, magmatic or volcanic activity that occurred during the geologic history of an area. There are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cauê Formation
{{hndis, Caue ...
Caue may refer to: People * Cauê Benicio (born 1978), Brazilian midfielder * Cauê Macris (born 1983), Brazilian politician * Cauê (footballer, born 1986), Cauê Santos da Mata, Brazilian football midfielder * Cauê (footballer, born 1987), Roberto Carvalho Cauê, Brazilian football defender * Caue Fernandes (born 1988), Brazilian football defender * Cauê (footballer, born 1989), Cauê Cecilio da Silva, Brazilian football midfielder * Cauê (footballer, born 2002), Cauê Vinícius dos Santos, Brazilian football forward Other uses * Caué District, district of São Tomé and Príncipe * Cauê (mascot), mascot for the 2007 Pan American Games The 2007 Pan American Games, officially known as the XV Pan American Games, were a major continental multi-sport event that took place in Rio de Janeiro, Brazil, from July 13 to 29, 2007. A total of 5,633 athletes from 42 National Olympic Com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
BIF (jaspilite Meta-BIF, Paleoproterozoic Minas Gerais , by ISO 4217 ...
BIF or bif may refer to: Organisations * Benevolence International Foundation, part of al-Qaeda, posing as a charity * Brabrand IF, football club playing in the Danish 2nd Division * Brøndby IF, football club playing in the Danish Superliga * Brynäs IF, ice hockey team from Gävle, Sweden * Die BIF, one of the first lesbian magazines Places * Barrow-in-Furness railway station, station code BIF * British Industries Fair, Birmingham, England Science and technology * Banded iron formation, a type of rock * '' Bifrenaria'', orchid genus Other uses * Bif Naked, Canadian musician * Bipartisan Infrastructure Framework, H.R. 3684, in relation to the 2021 U.S. infrastructure spending plan * Burundian franc The franc (ISO 4217 code is BIF) is the currency of Burundi. It is nominally subdivided into 100 ''centimes'', although coins have never been issued in centimes since Burundi began issuing its own currency. Only during the period when Burundi used ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geologic Map Listing The Gold Mines Of Minas Gerais
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 paleoclimatology, past climates. Geologists broadly study the properties and p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coffee
Coffee is a drink prepared from roasted coffee beans. Darkly colored, bitter, and slightly acidic, coffee has a stimulant, stimulating effect on humans, primarily due to its caffeine content. It is the most popular hot drink in the world. Seeds of the ''Coffea'' plant's fruits are separated to produce unroasted green coffee beans. The beans are Coffee roasting, roasted and then ground into fine particles that are typically steeped in hot water before being filtered out, producing a cup of coffee. It is usually served hot, although chilled or iced coffee is common. Coffee can be prepared and presented in a variety of ways (e.g., espresso, French press, caffè latte, or already-brewed canned coffee). Sugar, sugar substitutes, milk, and cream are often used to mask the bitter taste or enhance the flavor. Though coffee is now a global commodity, it has a History of coffee, long history tied closely to food traditions around the Red Sea. The earliest credible evidence of coffee d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lavra
A lavra or laura ( el, Λαύρα; Cyrillic: Ла́вра) is a type of monastery consisting of a cluster of cells or caves for hermits, with a church and sometimes a refectory at the center. It is erected within the Orthodox and other Eastern Christian traditions. The term is also used by some Roman Catholic communities. The term in Greek initially meant a narrow lane or an alley in a city.. History Byzantine laura/lavra From the fifth century the Greek term ''laura'' could refer specifically to the semi-eremitical monastic settlements of the Judaean Desert, where lauras were very numerous. The first lauras of Palestine were founded by Chariton the Confessor (born 3rd century, died ca. 350): the Laura of Pharan (now Wadi Qelt) northeast of Jerusalem, the Laura of Douka on the Mount of Temptation west of Jericho, and Souka Laura or Old Laura in the area of Tuqu' in Wadi Khureitun. Saint Euthymius the Great (377–473) founded one of the early lauras in fifth-century Palestine. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
