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Boris Choubert
Boris Choubert or Schuberth (1906 − December 3, 1983) was a French geologist. An adept of Wegener's theory, he was the first to precisely reconstruct the layout of the continental masses of Africa, America, Europe and Greenland prior to the fragmentation of Pangaea, thirty years before the article generally credited for this discovery. Biography Of Russian origin, Boris Schuberth, better known as Choubert was born in Saint Petersburg in 1906. He left Russia for Finland in 1917, then for France in 1927. He studied geology at La Sorbonne for two years, then at the ' (now ') in Nancy, where he received his diploma of engineer-geologist. In 1933 he was employed by the Government of Gabon (then a subdivision of French Equatorial Africa). In 1937 he defended his thesis on ' (Geologic study of ancient Gabon terrains). In 1946 he was hired by the ' (presently IRD) and left for French Guiana. In 1949 he founded a multidisciplinary research organization which would become the ' (Insti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saint Petersburg
Saint Petersburg ( rus, links=no, Санкт-Петербург, a=Ru-Sankt Peterburg Leningrad Petrograd Piter.ogg, r=Sankt-Peterburg, p=ˈsankt pʲɪtʲɪrˈburk), formerly known as Petrograd (1914–1924) and later Leningrad (1924–1991), is the List of cities and towns in Russia by population, second-largest city in Russia. It is situated on the Neva River, at the head of the Gulf of Finland on the Baltic Sea, with a population of roughly 5.4 million residents. Saint Petersburg is the List of European cities by population within city limits, fourth-most populous city in Europe after Istanbul, Moscow and London, the List of cities and towns around the Baltic Sea, most populous city on the Baltic Sea, and the world's List of northernmost items#Cities and settlements, northernmost city of more than 1 million residents. As Russia's Imperial capital, and a Ports of the Baltic Sea, historically strategic port, it is governed as a Federal cities of Russia, federal city. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prospecting
Prospecting is the first stage of the geological analysis (followed by exploration) of a territory. It is the search for minerals, fossils, precious metals, or mineral specimens. It is also known as fossicking. Traditionally prospecting relied on direct observation of mineralization in rock outcrops or in sediments. Modern prospecting also includes the use of geologic, geophysical, and geochemical tools to search for anomalies which can narrow the search area. Once an anomaly has been identified and interpreted to be a potential prospect direct observation can then be focused on this area. In some areas a prospector must also make claims, meaning they must erect posts with the appropriate placards on all four corners of a desired land they wish to prospect and register this claim before they may take samples. In other areas publicly held lands are open to prospecting without staking a mining claim. Historical methods The traditional methods of prospecting involved comb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Estuaire Province
Estuaire is the most populous of Gabon's nine provinces. It covers an area of 20,740 km. The provincial capital is Libreville, which is also Gabon's national capital. The province is named for the Gabon Estuary, which lies at the heart of the province. Estuaire is at the northwestern corner of Gabon, its western edge as the shores of the Gulf of Guinea. To the north, Estuaire borders the Republic of Equatorial Guinea: the Litoral Province in the northwest, and the Centro Sur Province in the northeast. Domestically, it borders the following provinces: * Woleu-Ntem – east * Moyen-Ogooué – south-southeast * Ogooué-Maritime – southwest Departments Estuaire is divided into 6 departments: * Komo Department ( Kango) * Komo-Mondah Department ( Ntoum) * Noya Department (Cocobeach Cocobeach is a town in northwestern Gabon, lying on the south bank of the Muni River. It is the capital of the Noya Department. It has a beach and is the main border town for Equatorial G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lambaréné
Lambaréné is a town and the capital of Moyen-Ogooué in Gabon. It has a population of 38,775 as of 2013, and is located 75 kilometres south of the equator. Lambaréné is based in the Central African Rainforest at the river Ogooué. This river divides the city into 3 districts: Rive Gauche, Ile Lambaréné and Rive Droite. The Albert Schweitzer Hospital and the districts Adouma and Abongo are located on Rive Droite. The districts Atongowanga, Sahoty, Dakar, Grand Village, Château, Lalala and Bordamur build the Ile Lambaréné. The majority of the people in Lambaréné live in the district Isaac located on Rive Gauche. This district hosts the Lambaréné Airport. Today Lambaréné is inhabited mainly by Bantu ethnic groups such as the Fang, Bapounou, Eshira, and Myéné; these displaced the Pygmies to the east and north of Gabon. The main economic activity in the town is the fishery and a new port is under construction. Schweitzer The Franco-German Nobel Peace Prize winner ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ikoy River
The Ikoy, also Dcoye, is a river of central-western Gabon. It is a tributary of the Ngounié River and flows into the river to the southeast of Lambaréné. It flows through the districts of Matèndè, Dibuwa, and Okobi and the banks are inhabited by Tsogo-speaking clans. The river is believed to be inhabited by a strange creature named a N’yamala In cryptozoology, the Mokele-mbembe (also written as "Mokèlé-mbèmbé"), Lingala for "one who stops the flow of rivers", is a water-dwelling entity that supposedly lives in the Congo River Basin, sometimes described as a living creature, some ..., a dinosaur-like creature over 30 feet. Fang witch doctor Michel Obiang reported seeing it in 1946 near its confluence with the Ngounié River. Tributaries include the Ikobe and the Oumba. Geologically the Ikoy Fault is a defined fault in this area of Gabon. References Rivers of Gabon {{Gabon-river-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alluvial Deposits
Alluvium (from Latin ''alluvius'', from ''alluere'' 'to wash against') is loose clay, silt, sand, or gravel that has been deposited by running water in a stream bed, on a floodplain, in an alluvial fan or beach, or in similar settings. Alluvium is also sometimes called alluvial deposit. Alluvium is typically geologically young and is not consolidated into solid rock. Sediments deposited underwater, in seas, estuaries, lakes, or ponds, are not described as alluvium. Floodplain alluvium can be highly fertile, and supported some of the earliest human civilizations. Definitions The present consensus is that "alluvium" refers to loose sediments of all types deposited by running water in floodplains or in alluvial fans or related landforms. However, the meaning of the term has varied considerably since it was first defined in the French dictionary of Antoine Furetière, posthumously published in 1690. Drawing upon concepts from Roman law, Furetière defined ''alluvion'' (the Fren ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diamond
Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Another solid form of carbon known as graphite is the chemically stable form of carbon at room temperature and pressure, but diamond is metastable and converts to it at a negligible rate under those conditions. Diamond has the highest hardness and thermal conductivity of any natural material, properties that are used in major industrial applications such as cutting and polishing tools. They are also the reason that diamond anvil cells can subject materials to pressures found deep in the Earth. Because the arrangement of atoms in diamond is extremely rigid, few types of impurity can contaminate it (two exceptions are boron and nitrogen). Small numbers of defects or impurities (about one per million of lattice atoms) color diamond blue (boron), yellow (nitrogen), brown (defects), green (radiation exposure), purple, pink, orange, or red. Diamond also has a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mineral Resource Estimation
Mineral resource estimation is used to determine and define the ore tonnage and grade of a geological deposit, from the developed block model. There are different estimation methods used for different scenarios dependent upon the ore boundaries, geological deposit geometry, grade variability and the amount of time and money available. A typical resource estimation involves the construction of a geological and resource model with data from various sources. Depending on the nature of the information and whether the data is hard copy or computerized, the principal steps of computer resource estimation are: # Creation, standardization and validation of the database. # Section plotting and interactive geological modeling. # Geostatistical analysis. # Block modeling and block estimation. Geological modelling An orebody model serves as the geological basis of all resource estimation, an orebody modeling project starts with a critical review of existing drill hole and surface or undergrou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manganese
Manganese is a chemical element with the symbol Mn and atomic number 25. It is a hard, brittle, silvery metal, often found in minerals in combination with iron. Manganese is a transition metal with a multifaceted array of industrial alloy uses, particularly in stainless steels. It improves strength, workability, and resistance to wear. Manganese oxide is used as an oxidising agent; as a rubber additive; and in glass making, fertilisers, and ceramics. Manganese sulfate can be used as a fungicide. Manganese is also an essential human dietary element, important in macronutrient metabolism, bone formation, and free radical defense systems. It is a critical component in dozens of proteins and enzymes. It is found mostly in the bones, but also the liver, kidneys, and brain. In the human brain, the manganese is bound to manganese metalloproteins, most notably glutamine synthetase in astrocytes. Manganese was first isolated in 1774. It is familiar in the laboratory in the form ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodochrosite
Rhodochrosite is a manganese carbonate mineral with chemical composition MnCO3. In its (rare) pure form, it is typically a rose-red color, but impure specimens can be shades of pink to pale brown. It streaks white, and its Mohs hardness varies between 3.5 and 4. Its specific gravity is between 3.5 and 3.7. It crystallizes in the trigonal system, and cleaves with rhombohedral carbonate cleavage in three directions. Crystal twinning often is present. It is transparent to translucent with refractive indices of ''nω''=1.814 to 1.816, ''nε''=1.596 to 1.598. It is often confused with the manganese silicate, rhodonite, but is distinctly softer. It is officially listed as one of the National symbols of Argentina. Rhodochrosite forms a complete solid solution series with iron carbonate ( siderite). Calcium, (as well as magnesium and zinc, to a limited extent) frequently substitutes for manganese in the structure, leading to lighter shades of red and pink, depending on the degree of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manganite
Manganite is a mineral composed of manganese oxide-hydroxide, MnO(OH), crystallizing in the monoclinic system (pseudo-orthorhombic). Crystals of manganite are prismatic and deeply striated parallel to their length; they are often grouped together in bundles. The color is dark steel-grey to iron-black, and the luster brilliant and submetallic. The streak is dark reddish brown. The hardness is 4, and the specific gravity is 4.3. There is a perfect cleavage parallel to the brachypinacoid, and less-perfect cleavage parallel to the prism faces. Twinned crystals are not infrequent. The mineral contains 89.7% manganese sesquioxide; it dissolves in hydrochloric acid with evolution of chlorine. Occurrence Manganite occurs with other manganese oxides in deposits formed by circulating meteoric water in the weathering environment in clay deposits and laterites. It forms by low temperature hydrothermal action in veins in association with calcite, barite, and siderite. Often associated w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Igneous Petrology
Igneous petrology is the study of igneous rocks—those that are formed from magma. As a branch of geology, igneous petrology is closely related to volcanology, tectonophysics, and petrology in general. The modern study of igneous rocks utilizes a number of techniques, some of them developed in the fields of chemistry, physics, or other earth sciences. Petrography, crystallography, and isotopic studies are common methods used in igneous petrology. Methods Determination of chemical composition The composition of igneous rocks and minerals can be determined via a variety of methods of varying ease, cost, and complexity. The simplest method is observation of hand samples with the naked eye and/or with a hand lens. This can be used to gauge the general mineralogical composition of the rock, which gives an insight into the composition. A more precise but still relatively inexpensive way to identify minerals (and thereby the bulk chemical composition of the rock) with a petrographic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
