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Púrus Arch
The Púrus Arch ( pt, Arco do Purus) is a basement high in Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ... that makes up the modern western boundary of the Amazon sedimentary basin.Morales L.G. (1957). "A study of the Upper Amazonas and its oil possibilities". '' Relatório Interno da Petrobras'', Depex 822, 22 p. The Purús Arch is thought to be a former graben of Middle Proterozoic age that was inversed in the Late Proterozoic. References {{reflist Basement highs Geology of Brazil Mesoproterozoic rifts and grabens ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Basement High
In geology, a basement high is a portion of the basement (geology), basement in a sedimentary basin that is higher than its surroundings. Commonly, structures referred to as basement highs are hidden by the sedimentary fill of the basin. Usually basement highs are elongated features of tectonics, tectonic origin.
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Basement highs, ...
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Geology Of Brazil
The geology of Brazil includes very ancient craton basement rock from the Precambrian overlain by sedimentary rocks and intruded by igneous activity, as well as impacted by the rifting of the Atlantic Ocean. Geologic history, stratigraphy, and tectonics Much of the rock underlying Brazil formed during the Precambrian, including the São Francisco Craton which outcrops in Minas Gerais and Bahia. In the Mesoproterozoic, the Rio de la Plata Craton (beneath southern Brazil), the vast Amazonia Craton, and the small São Luis Craton and sections of the Congo Craton which form the basement rock of much of Brazil were joined with Africa. Earlier, during the Archean, the São Francisco Craton developed between 3.2 and 2.6 billion years ago and grew as microcontinents collided with it, forming a series of mobile belts. The rocks became a craton, a section of stable continental crust by the end of the Trans-amazonian orogeny 1.8 billion years ago. The Borborema Province is benea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amazon Basin (sedimentary Basin)
The Amazon Basin is a large sedimentary basin (620,000 square kilometres (240,000 sq mi)) located near the middle and lower course of the Amazon River, south the Guiana Shield and north of the Central Brazilian Shield. The basin developed on a rift that originated about 550 million years ago during the Cambrian. Location The Amazon Basin is located south of the Guiana Shield, north of the Central Brazilian Shield, east of the Solimões Basin, and west of the Marajó Basin. It is bound to the west by the Púrus Arch and in the east by the Gurupá Arch. The basin has an elongated shape with a WSW-ENE orientation. Its long axis runs from the vicinity of Manaus to the area near the confluence of Xingu River with the Amazon River. Evolution of the Basin The Amazon Basin was developed on a rift, called the Sub-Amazonal Rift, that originated about 550 million years ago during continental collision of the West African Craton. Parts of the rift were reactivated during the openi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petrobras
Petróleo Brasileiro S.A., better known by the portmanteau Petrobras (), is a state owned enterprise, state-owned Brazilian multinational corporation in the petroleum industry headquartered in Rio de Janeiro, Brazil. The company's name translates to Brazilian Petroleum Corporation — Petrobras. The company was ranked #181 in the most recent Fortune Global 500 list. In the 2020 Forbes Global 2000, Petrobras was ranked as the 65th-largest public company in the world.' History Petrobras was created in 1953 under the government of Brazilian president Getúlio Vargas with the slogan "The Oil is Ours" (Portuguese: "O petróleo é nosso"). It was given a legal monopoly in Brazil. In 1953, Brazil produced only 2,700 barrels of oil per day. In 1961, the company's REDUC refinery began operations near Rio de Janeiro, and in 1963, its Cenpes research center opened in Rio de Janeiro; it remains one of the world's largest centers dedicated to energy research. In 1968, the company estab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brazilian Journal Of Geology
''Brazilian Journal of Geology'' (formerly ''Revista Brasileira de Geociências'') is a quarterly peer-reviewed scientific journal published by the Sociedade Brasileira de Geologia, Brazil's main geology society. The journal covers the field of geology and related earth sciences, in Brazil, South America, and Antarctica, including oceanic regions adjacent to these regions. The journal was established in 1971 and articles are published in English and Portuguese. The journal replaced the ''Boletim da Sociedade Brasileira de Geologia'' established in 1952. The journal is sponsored by Petrobras Petróleo Brasileiro S.A., better known by the portmanteau Petrobras (), is a state owned enterprise, state-owned Brazilian multinational corporation in the petroleum industry headquartered in Rio de Janeiro, Brazil. The company's name transla .... References External links * Geology journals Geology of South America Geology of Brazil Publications established in 1971 Multilin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graben
In geology, a graben () is a depressed block of the crust of a planet or moon, bordered by parallel normal faults. Etymology ''Graben'' is a loan word from German, meaning 'ditch' or 'trench'. The word was first used in the geologic context by Eduard Suess in 1883. The plural form is either ''graben'' or ''grabens''. Formation A graben is a valley with a distinct escarpment on each side caused by the displacement of a block of land downward. Graben often occur side by side with horsts. Horst and graben structures indicate tensional forces and crustal stretching. Graben are produced from parallel normal faults, where the displacement of the hanging wall is downward, while that of the footwall is upward. The faults typically dip toward the center of the graben from both sides. Horsts are parallel blocks that remain between graben; the bounding faults of a horst typically dip away from the center line of the horst. Single or multiple graben can produce a rift valley. Half-g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proterozoic
The Proterozoic () is a geological eon spanning the time interval from 2500 to 538.8million years ago. It is the most recent part of the Precambrian "supereon". It is also the longest eon of the Earth's geologic time scale, and it is subdivided into three geologic eras (from oldest to youngest): the Paleoproterozoic, Mesoproterozoic, and Neoproterozoic. The Proterozoic covers the time from the appearance of oxygen in Earth's atmosphere to just before the proliferation of complex life (such as trilobites or corals) on the Earth. The name ''Proterozoic'' combines two forms of ultimately Greek origin: meaning 'former, earlier', and , 'of life'. The well-identified events of this eon were the transition to an oxygenated atmosphere during the Paleoproterozoic; the evolution of eukaryotes; several glaciations, which produced the hypothesized Snowball Earth during the Cryogenian Period in the late Neoproterozoic Era; and the Ediacaran Period (635 to 538.8 Ma) which is characterize ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tectonic Inversion
In structural geology inversion or basin inversion relates to the relative uplift of a sedimentary basin or similar structure as a result of crustal shortening. This normally excludes uplift developed in the footwalls of later extensional faults, or uplift caused by mantle plumes. "Inversion" can also refer to individual faults, where an extensional fault is reactivated in the opposite direction to its original movement. The term ''negative inversion'' is also occasionally used to describe the reactivation of reverse faults and thrusts during extension. The term "inversion" simply refers to the fact that a relatively low-lying area is uplifted – the rock sequence itself is not normally inverted. Formation Many inversion structures are caused by the direct reactivation of pre-existing extensional faults. In some cases only the deeper parts of the fault are reactivated and the shortening is accommodated over a much broader area in the shallow part of the section. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Basement Highs
A basement or cellar is one or more floors of a building that are completely or partly below the ground floor. It generally is used as a utility space for a building, where such items as the furnace, water heater, breaker panel or fuse box, car park, and air-conditioning system are located; so also are amenities such as the electrical system and cable television distribution point. In cities with high property prices, such as London, basements are often fitted out to a high standard and used as living space. In British English, the word ''basement'' is usually used for underground floors of, for example, department stores. The word is usually used with houses when the space below the ground floor is habitable, with windows and (usually) its own access. The word ''cellar'' applies to the whole underground level or to any large underground room. A ''subcellar'' is a cellar that lies further underneath. Purpose, geography, and history A basement can be used in almost exactly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
