[PDF] Mantle Metasomatism And Alkaline Magmatism eBook

Author : Peter H. Nixon
Publisher : John Wiley & Sons
Page : 892 pages
File Size : 23,50 MB
Release : 1987
Category : Nature
ISBN :

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The eruption of deep-seated xenoliths in basaltic, alnoitic, kimberlitic, etc volcanoes provides the geologist with an important direct means of examining the fragments of the earth's mantle and lower crust.

Author : Franco Pirajno
Publisher : Springer Science & Business Media
Page : 721 pages
File Size : 36,52 MB
Release : 2012-12-06
Category : Science
ISBN : 3642756719

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This book is intended primarily for exploration geologists and post graduate students attending specialist courses in mineral exploration. Exploration geologists are engaged not only in the search for new mineral deposits, but also in the extension and re-assessment of existing ones. To succeed in these tasks, the exploration geologist is required to be a "generalist" of the Earth sciences rather than a specialist. The exploration geologist needs to be familiar with most aspects of the geology of ore deposits, and detailed knowledge as well as experience play an all important role in the successful exploration for mineral commodities. In order to achieve this, it is essential that the exploration geologist be up to date with the latest developments in the evolution of concepts and ideas in the Earth sciences. This is no easy task, as thousands of publications appear every year in an ever increasing number of journals, periodicals and books. For this reason it is also difficult, at times, to locate appropriate references on a particular mineral deposit type, although this problem is alleviated by the existence of large bibliographic data bases of geological records, abstracts and papers on computers. During my teaching to explorationists and, indeed, during my years of work as an explorationist, the necessity of having a text dealing with the fundamental aspects of hydrothermal mineral deposits has always been compelling. Metallic mineral deposits can be categorised into three great families, namely: (I) magmatic; (2) sedimentary and residual; (3) hydrothermal.

Author : Tara L. Allen
Publisher :
Page : 55 pages
File Size : 26,83 MB
Release : 2012
Category : Electronic dissertations
ISBN :

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The ages, mineral assemblages, and chemical compositions show that these late Oligocene alkaline magmas formed after a shallowly subducting oceanic slab peeled away from the overlying continental lithosphere and rolled back. Hot asthenosphere flowed in to replace the subducting plate and caused partial melting of the variably metasomatized lithospheric mantle. These alkaline magmas include the shoshonite, mafic alkaline dikes, and minette of Boulter Peak; they mark the transition from older subduction-related magmatism to Miocene magmatism caused by lithospheric extension.

Author : Eric A. K. Middlemost
Publisher : Routledge
Page : 324 pages
File Size : 26,24 MB
Release : 2014-06-03
Category : Science
ISBN : 131789264X

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The variety of volcanic activity in the Solar System is widely recognised, yet the majestic sequences of magmatic processes that operate within an active planet are much less well known. Providing an exposition of igneous rocks, magmas and volcanic erupsions, this book brings together magnetic and volcanic data from different tectonic settings, and planets, with explanations of how they fit together. It systematically examines composition, origin and evolution of common igneous rocks, yet also examines a variety of rare magnetic rocks that play a crucial role in the global magma/igneous rock system.

Author : J Kornprobst
Publisher : Elsevier
Page : 408 pages
File Size : 24,82 MB
Release : 2013-10-22
Category : Nature
ISBN : 1483256928

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Developments in Petrology, 11B: Kimberlites, II: The Mantle and Crust-Mantle Relationships focuses on the formation, characteristics, and properties of kimberlites. The selection first offers information on silicate and oxide inclusions in diamonds and diamond eclogite and graphite eclogite xenoliths from Orapa, Botswana. The text also ponders on petrography, petrology, and geochemistry of xenoliths and megacrysts from the Geronimo Volcanic Field in Arizona and two-pyroxene megacrysts from South African kimberlites. The text elaborates on the nature of the upper-most mantle beneath Victoria, Australia as deduced from ultramafic xenoliths and depleted mantle rocks and metasomatically altered peridotite inclusions in tertiary basalts from the Hessian Depression. Topics include area and rocks of investigation, composition, abundance, and properties of metasomatically altered mantle, and petrography and mineralogy. The selection is a dependable source of information for readers interested in the formation, properties, and characteristics of kimberlites.