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Muva
The Muva is a term coined by E.H. Ackermann (1950) for a folded supracrustal shallow water succession of quartzites and pelites in the Irumide Belt of Zambia. The "Muva" was first described by A. Gray (1930). y-f-qw-c.tumblr.com The sequence is interpreted as a 1.8 billion year old shallow marine to coastal sequence which includes dunal deposits (aeolian), beach sands, offshore sand deposits and deeper water pelitic sediments. The alternation of quartzite-pelite successions was interpreted to record transgressive and regressive phases of a coastline along the southern margin of the Bangweulu Block. The presence of these type of rocks is also seen in areas that have undergone marine transgression. In the western coastline of the Indian peninsula the Jurassic strata show this character of undergoing a submergence owing to crustal disturbance on the surface of the ocean floor and lead to the presence of marl with limestone in shallow water areas. Such effects are widely observed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Irumide Belt
The Irumide Belt is a Mesoproterozoic terrane of deformed basement and folded supracrustals, which occurs along the southern margin of an Archaean/Palaeoproterozoic unit called the Bangweulu Block in Zambia. Together with the Damara Belt, it separates the Congo and Kalahari cratons. The Irumide Belt comprises deformed crystalline basement units dated at 2.7 and between 2.05 and 1.93 Ga, unconformably and in places structurally overlain by a supracrustal sequence of shallow water quartzites and pelites, the Muva Supergroup, in which sparse volcanic tuffs have given ages of between 1.88 and 1.85 Ga. This complex is intruded by limited granitoids at ca. 1.66-1.55 Ga and an extensive suite of syn-orogenic plutonic rock Intrusive rock is formed when magma penetrates existing rock, crystallizes, and solidifies underground to form '' intrusions'', such as batholiths, dikes, sills, laccoliths, and volcanic necks.Intrusive RocksIntrusive rocks accessdate: March ...s at between 1. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Supracrustal
Supracrustal rocks (''supra'' (Latin for "above")) are rocks that were deposited on the existing basement rocks of the crust, hence the name. They may be further metamorphosed from both sedimentary and volcanic rocks. The oldest minerals on Earth are detrital zircon grains from the Yilgarn Craton in the Mesoarchaean (3.2–2.8 Ga) Jack Hills, Western Australia dated to up to 4.4 Ga, meaning that granitic continental crust and probably supracrustal rocks formed during the Hadean, within 200 million years of Earth accretion. Most Hadean rocks were probably recycled into the mantle before the end of the eon, however, and such pre-4.0 Ga mineral inclusions, the only traces from the earliest rock formation on Earth, are rare. The Acasta orthogneisses of the Slave Craton, Canada, are regarded to be the oldest rocks on Earth, dated to 4.06 Ga, include protoliths such as TTGs, amphibolite, gabbro, granite, and diorite. It is possible that such early Hadean TTGs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quartzite
Quartzite is a hard, non- foliated metamorphic rock which was originally pure quartz sandstone.Essentials of Geology, 3rd Edition, Stephen Marshak, p 182 Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts. Pure quartzite is usually white to grey, though quartzites often occur in various shades of pink and red due to varying amounts of hematite. Other colors, such as yellow, green, blue and orange, are due to other minerals. The term ''quartzite'' is also sometimes used for very hard but unmetamorphosed sandstones that are composed of quartz grains thoroughly cemented with additional quartz. Such sedimentary rock has come to be described as orthoquartzite to distinguish it from metamorphic quartzite, which is sometimes called metaquartzite to emphasize its metamorphic origins. Quartzite is very resistant to chemical weathering and often forms ridges and resistant hilltops. The nearly pure silica co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pelite
A pelite (Greek: ''pelos'', "clay") or metapelite is a metamorphosed fine-grained sedimentary rock, i.e. mudstone or siltstone. The term was earlier used by geologists to describe a clay-rich, fine-grained clastic sediment or sedimentary rock, i.e. mud or a mudstone, the metamorphosed version of which would technically have been a ''metapelite''. It was equivalent to the now little-used Latin-derived term lutite.Potter, P.E., J.B. Maynard, and P.J. Depetris (2005) ''Muds and Mudstones.'' New York, New York, Springer. 279 pp. Neuendorf, K.K.E., J.P. Mehl, Jr., and J.A. Jackson, eds. (2005) ''Glossary of Geology'' (5th ed.). Alexandria, Virginia, American Geological Institute. 779 pp. A semipelite is defined in part as having similar chemical composition but being of a crystalloblastic nature. Pettijohn (1975) gives the following descriptive terms based on grain size, avoiding the use of terms such as clay or argillaceous which carry an implication of chemical composition. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zambia
Zambia (), officially the Republic of Zambia, is a landlocked country at the crossroads of Central, Southern and East Africa, although it is typically referred to as being in Southern Africa at its most central point. Its neighbours are the Democratic Republic of the Congo to the north, Tanzania to the northeast, Malawi to the east, Mozambique to the southeast, Zimbabwe and Botswana to the south, Namibia to the southwest, and Angola to the west. The capital city of Zambia is Lusaka, located in the south-central part of Zambia. The nation's population of around 19.5 million is concentrated mainly around Lusaka in the south and the Copperbelt Province to the north, the core economic hubs of the country. Originally inhabited by Khoisan peoples, the region was affected by the Bantu expansion of the thirteenth century. Following the arrival of European explorers in the eighteenth century, the British colonised the region into the British protectorates of Barotseland-No ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Economic Geology (journal)
''Economic Geology'' is a peer-reviewed scientific journal about economic geologies published by the Economic Geology Publishing Company from 1905 until 2001, when the company merged with the Society of Economic Geologists The Society of Economic Geologists (SEG) is a scientific organization that promotes the study of geology as it relates to mining, mineral exploration, mineral resource classification and mineral extraction. The society's Publication Board publishe ... (SEG). The Publications Board of the SEG now manages the journal. References External links * Economics journals Geology journals English-language journals Economic geology Mining journals Publications established in 1905 Resource economics 1905 establishments in the United States {{geology-journal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bangweulu Block
The Bangweulu Block is a cratonic unit that forms part of the Congo craton of central Africa. The Bangweulu Block however consists of Palaeoproterozoic granitoids and volcanics, and is overlain by a Palaeoproterozoic continental sedimentary succession, the Mporokoso Group, and does not preserve much direct evidence of Archaean protoliths. Indirect evidence of an Archaean ancestry for the Bangweulu Block is provided by detrital zircons within the Mporokoso Group, which indicate a local source area with zircons of 3.2, 3.0. 2.7 and 2.5 Ga, but more importantly, by xenocrystic zircon found in volcanic and granitic lithologies of the Bangweulu Block, and the area to the West, the Central African Copperbelt (Rainaud et al., 2003). This indicates the presence of a ''ca''. 3.2 Ga terrane called the ''Likasi Terrane''. The Banweulu Block is bordered on the west by the Kundelungu Plateau, on the southwest by the Lufilian Arc, on the southeast by the Kibaran Irumide Belt, and on t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jurassic
The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The Jurassic constitutes the middle period of the Mesozoic, Mesozoic Era and is named after the Jura Mountains, where limestone strata from the period were first identified. The start of the Jurassic was marked by the major Triassic–Jurassic extinction event, associated with the eruption of the Central Atlantic magmatic province, Central Atlantic Magmatic Province. The beginning of the Toarcian Stage started around 183 million years ago and is marked by an extinction event associated with widespread Anoxic event, oceanic anoxia, ocean acidification, and elevated temperatures likely caused by the eruption of the Karoo-Ferrar, Karoo-Ferrar large igneous provinces. The end of the Jurassic, however, has no clear boundary with the Cretaceous and i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saurashtra (region)
Saurashtra, also known as Sorath or Kathiawar, is a peninsular region of Gujarat, India, located on the Arabian Sea coast. It covers about a third of Gujarat state, notably 11 districts of Gujarat, including Rajkot District. It was formerly a state of India before it merged with Bombay state. In 1961 it separated from Bombay and joined Gujarat. Location Saurashtra peninsula is bound on the south and south-west by the Arabian sea, on the north-west by the Gulf of Kutch and on the east by the Gulf of Khambhat. From the apex of these two gulfs, the Little Rann of Kutch and Khambhat, waste tracts half salt morass half sandy desert, stretch inland towards each other and complete the isolation of Kathiawar, except one narrow neck which connects it on the north-east with the mainland of Gujarat. The peninsula is sometimes referred to as Kathiawar after the Kathi Darbar, which once ruled most of the region. However, Saurashtra is not entirely synonymous with Kathiawar, since a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gujarat
Gujarat (, ) is a state along the western coast of India. Its coastline of about is the longest in the country, most of which lies on the Kathiawar peninsula. Gujarat is the fifth-largest Indian state by area, covering some ; and the ninth-most populous state, with a population of 60.4 million. It is bordered by Rajasthan to the northeast, Dadra and Nagar Haveli and Daman and Diu to the south, Maharashtra to the southeast, Madhya Pradesh to the east, and the Arabian Sea and the Pakistani province of Sindh to the west. Gujarat's capital city is Gandhinagar, while its largest city is Ahmedabad. The Gujaratis are indigenous to the state and their language, Gujarati, is the state's official language. The state encompasses 23 sites of the ancient Indus Valley civilisation (more than any other state). The most important sites are Lothal (the world's first dry dock), Dholavira (the fifth largest site), and Gola Dhoro (where 5 uncommon seals were found). Lothal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rajasthan
Rajasthan (; lit. 'Land of Kings') is a state in northern India. It covers or 10.4 per cent of India's total geographical area. It is the largest Indian state by area and the seventh largest by population. It is on India's northwestern side, where it comprises most of the wide and inhospitable Thar Desert (also known as the Great Indian Desert) and shares a border with the Pakistani provinces of Punjab to the northwest and Sindh to the west, along the Sutlej- Indus River valley. It is bordered by five other Indian states: Punjab to the north; Haryana and Uttar Pradesh to the northeast; Madhya Pradesh to the southeast; and Gujarat to the southwest. Its geographical location is 23.3 to 30.12 North latitude and 69.30 to 78.17 East longitude, with the Tropic of Cancer passing through its southernmost tip. Its major features include the ruins of the Indus Valley civilisation at Kalibangan and Balathal, the Dilwara Temples, a Jain pilgrimage site at Rajasthan's only hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geography Of Zambia
Zambia is a landlocked country located in Southern Africa, to the east of Angola. It has a total area of 752,618 square kilometres (slightly larger than France), of which 9 220 km2 is water. Political geography Zambia has a total of 5 664 km of land boundaries, and it borders: Angola for 1,110 km, Democratic Republic of the Congo for 1,930 km, Malawi for 837 km, Mozambique for 419 km, Namibia for 233 km, Tanzania for 338 km, Zimbabwe for 797 km, and Botswana, less than . Physical geography Climate Zambia has a tropical climate, modified by the altitude of the country. There is a rainy season that runs from October/November to March/April. Terrain The terrain of Zambia is mostly high plateau, with some hills and mountains. The lowest point is the Zambezi river, at above sea level, with the highest being Mafinga Central in the Mafinga Hills, at above sea level. Zambia is a landlocked country bordered along Zimbabwe in the south divi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
