|
Phonotephrite
Phonotephrite or phono-tephrite is a strongly alkaline volcanic rock with a composition between phonolite and tephrite. This unusual igneous rock contains 7 to 12% alkali content and 45 to 53% silica content (see TAS diagram). It can be described as a mafic phonolite or a potassic tephrite. Phonotephrite lava flows and volcanic cones have been identified in Antarctica (e.g. Mount Erebus), Europe (e.g. Mount Vesuvius), North America (e.g. Satah Mountain volcanic field) and Africa (e.g. Jbel Saghro). See also *Tephriphonolite Tephriphonolite or tephri-phonolite is a mafic to intermediate extrusive igneous rock in composition between phonotephrite and phonolite. It contains 9 to 14% alkali content and 48 to 57% silica content (see TAS diagram). Tephriphonolite is roughl ... References {{petrology-stub Mafic rocks Volcanic rocks ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TAS Classification
The TAS classification can be used to assign names to many common types of volcanic rocks based upon the relationships between the combined alkali content and the silica content. These chemical parameters are useful, because the relative proportions of alkalis and silica play an important role in determining actual mineralogy and normative mineralogy. The classification appears to be and can be simple to use for rocks that have been chemically analyzed. Except for the following quotation from Johannsen (1937), this entry is based upon Le Maitre and others (2002). Use of the TAS classification TAS stands for Total Alkali Silica. Before using the TAS or any other classification, however, the following words of Johannsen (1937) should be kept in mind. :''Many and peculiar are the classifications that have been proposed for igneous rocks. Their variability depends in part upon the purpose for which each was intended, and in part upon the difficulties arising from the characters of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Satah Mountain Volcanic Field
The Satah Mountain volcanic field (SMVF) is an extensive north-south trending volcanic chain in the Central Interior of British Columbia that stretches south of the Itcha Range shield volcano to northeast of Nimpo Lake. The chain is located on the Chilcotin Plateau, a major subdivision of the Interior Plateau that includes other nearby volcanic features. It forms a segment of the east-west trending Anahim Volcanic Belt, whose volcanic activity ranges in age from Miocene-to-Holocene. This volcanic chain is named after its highest volcano, Satah Mountain, northeast of Nimpo Lake. Geology Volcanic features in the Satah Mountain field include lava domes, cinder cones and lava flows. Lava domes and flows are composed of trachyte and the cinder cones consist of basaltic and trachybasaltic lava. The most recently formed cone is well preserved and might have a similar age to the 7,200‑year‑old Nazko Cone at the easternmost end of the Anahim Volcanic Belt. However, argon-argon dating ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peridotite Mantle Xenoliths In Vesicular Phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 Ka; Peridot Mesa, San Carlos Volcanic Field, Arizona) 10 (31101103172)
Peridotite ( ) is a dense, coarse-grained igneous rock consisting mostly of the silicate minerals olivine and pyroxene. Peridotite is ultramafic, as the rock contains less than 45% silica. It is high in magnesium (Mg2+), reflecting the high proportions of magnesium-rich olivine, with appreciable iron. Peridotite is derived from Earth's mantle, either as solid blocks and fragments, or as crystals accumulated from magmas that formed in the mantle. The compositions of peridotites from these layered igneous complexes vary widely, reflecting the relative proportions of pyroxenes, chromite, plagioclase, and amphibole. Peridotite is the dominant rock of the upper part of Earth's mantle. The compositions of peridotite nodules found in certain basalts are of special interest along with diamond pipes (kimberlite), because they provide samples of Earth's mantle brought up from depths ranging from about 30 km to 200 km or more. Some of the nodules preserve isotope ratios of osmi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Vesuvius
Mount Vesuvius ( ; it, Vesuvio ; nap, 'O Vesuvio , also or ; la, Vesuvius , also , or ) is a somma-stratovolcano located on the Gulf of Naples in Campania, Italy, about east of Naples and a short distance from the shore. It is one of several volcanoes forming the Campanian volcanic arc. Vesuvius consists of a large cone partially encircled by the steep rim of a summit caldera, resulting from the collapse of an earlier, much higher structure. The eruption of Mount Vesuvius in AD 79 destroyed the Roman cities of Pompeii, Herculaneum, Oplontis, Stabiae, and several other settlements. The eruption ejected a cloud of stones, ashes and volcanic gases to a height of , erupting molten rock and pulverized pumice at the rate of per second. More than 1,000 people are thought to have died in the eruption, though the exact toll is unknown. The only surviving eyewitness account of the event consists of two letters by Pliny the Younger to the historian Tacitus. Vesuvius has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tephriphonolite
Tephriphonolite or tephri-phonolite is a mafic to intermediate extrusive igneous rock in composition between phonotephrite and phonolite. It contains 9 to 14% alkali content and 48 to 57% silica content (see TAS diagram). Tephriphonolite is roughly equivalent to tephritic phonolite of the QAPF classification. Tephriphonolite has been found, for example, at Colli Albani volcano in Italy and in the Asunción Rift of Paraguay Paraguay (; ), officially the Republic of Paraguay ( es, República del Paraguay, links=no; gn, Tavakuairetã Paraguái, links=si), is a landlocked country in South America. It is bordered by Argentina to the south and southwest, Brazil to th .... References {{petrology-stub Volcanic rocks Mafic rocks Intermediate rocks ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxford University Press
Oxford University Press (OUP) is the university press of the University of Oxford. It is the largest university press in the world, and its printing history dates back to the 1480s. Having been officially granted the legal right to print books by decree in 1586, it is the second oldest university press after Cambridge University Press. It is a department of the University of Oxford and is governed by a group of 15 academics known as the Delegates of the Press, who are appointed by the vice-chancellor of the University of Oxford. The Delegates of the Press are led by the Secretary to the Delegates, who serves as OUP's chief executive and as its major representative on other university bodies. Oxford University Press has had a similar governance structure since the 17th century. The press is located on Walton Street, Oxford, opposite Somerville College, in the inner suburb of Jericho. For the last 500 years, OUP has primarily focused on the publication of pedagogical texts and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of Petrology
The ''Journal of Petrology'' is a monthly peer-reviewed academic journal focused on the field of igneous and metamorphic petrology and petrogenesis. The journal is published by the Oxford University Press and indexed in the Science Citation Index. The editor-in-chief is Georg Zellmer (Massey University). Abstracting and indexing The journal is abstracted and indexed in: *Aquatic Sciences and Fisheries Abstracts *Chemical Abstracts *CAB Abstracts *Current Contents/Physical, Chemical and Earth Sciences *GEOBASE * ProQuest databases *Science Citation Index According to the ''Journal Citation Reports'', the journal has a 2020 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as i ... of 4.515. References External links * English-language journals 1960 establishments in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mineralogical Society Of Great Britain And Ireland
The Mineralogical Society of Great Britain and Ireland began in 1876. Its main purpose is to disseminate scientific knowledge of the Mineral Sciences (mineralogy) as it may be applied to the fields of crystallography, geochemistry, petrology, environmental science and economic geology. In support of this vision, the society publishes scientific journals, books and monographs. It also organizes and sponsors scientific meetings, and the society connects with other societies which have similar scientific interests. Some of these other societies are the International Mineralogical Association, the European Mineralogical Union, the Mineralogical Society of America, the Mineralogical Association of Canada, the Geological Society of London, IOM3, the North of England Institute of Mining and Mechanical Engineers and the Microbiology Society. Publications The Society publishes a variety of book series; these are entitled the "Landmark Series", the "Mineralogical Society Special Seri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mineralogical Magazine
The Mineralogical Society of Great Britain and Ireland began in 1876. Its main purpose is to disseminate scientific knowledge of the Mineral Sciences (mineralogy) as it may be applied to the fields of crystallography, geochemistry, petrology, environmental science and economic geology. In support of this vision, the society publishes scientific journals, books and monographs. It also organizes and sponsors scientific meetings, and the society connects with other societies which have similar scientific interests. Some of these other societies are the International Mineralogical Association, the European Mineralogical Union, the Mineralogical Society of America, the Mineralogical Association of Canada, the Geological Society of London, IOM3, the North of England Institute of Mining and Mechanical Engineers and the Microbiology Society. Publications The Society publishes a variety of book series; these are entitled the "Landmark Series", the "Mineralogical Society Special Seri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Springer Science+Business Media
Springer Science+Business Media, commonly known as Springer, is a German multinational publishing company of books, e-books and peer-reviewed journals in science, humanities, technical and medical (STM) publishing. Originally founded in 1842 in Berlin, it expanded internationally in the 1960s, and through mergers in the 1990s and a sale to venture capitalists it fused with Wolters Kluwer and eventually became part of Springer Nature in 2015. Springer has major offices in Berlin, Heidelberg, Dordrecht, and New York City. History Julius Springer founded Springer-Verlag in Berlin in 1842 and his son Ferdinand Springer grew it from a small firm of 4 employees into Germany's then second largest academic publisher with 65 staff in 1872.Chronology ". Springer Science+Business Media. In 1964, Springer expanded its business internationally, o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bulletin Of Volcanology
The ''Bulletin of Volcanology'' is a peer reviewed scientific journal that is published ten times per year by Springer Science+Business Media. It is the official journal of the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI). The focus of the journal is volcanoes, volcanic products, eruptive behavior, and volcanic hazards. The Executive Editor is James DL White. The impact factor for ''Bulletin of Volcanology'' in 2020 is 2.517. Scope and history Applying geochemical, petrological, and geophysical techniques to understand volcanic systems (magmatic systems) and their evolution is part of this journal's focus. Publishing formats include original research papers, reviews, communications, and a discussion forum. Additionally, this journal is a continuation of ''Bulletin Volcanologique'' which was published first in 1922. In 1986 Springer-Verlag started publishing this journal with Volume 48. Abstracting and indexing ''Bulletin of Volcano ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jbel Saghro
The Jbel Saghro or Djebel Sahrho ( ber, Adrar Saɣru, ar, جبل صغرو) is a mountain range in south- east Morocco. It is located south of the High Atlas and east of the Anti-Atlas in the northwest of Africa, northeast of Taliouine and southwest of Ouarzazate. Geography The Jbel Saghro is an eastern prolongation of the Anti-Atlas, separated from it by the valley of the Draâ. To the north of the range runs the valley of the Dadès, separating it from the massive High Atlas Range. ''Saɣru'' in the Tamazight language means ''drought'', an apt name considering that the Jbel Saghro is the driest mountain area of the whole Atlas Mountain System. Since it is located in the inland side of the greater range this massif does not benefit from the Atlantic Ocean winds that bring humidity to the Anti-Atlas ranges further to the west as well as other ocean-facing ranges further north. Annual rainfall is only 100 mm in the southern slopes and 300 mm at the summits. However, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Oxford University Press")
