Download or read book Geology and Thorium Deposits of the Wet Mountains Colorado written by Robert Adam Christman and published by . This book was released on 1959 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report concerns work done partly on behalf of the U.S. Atomic Energy Commission and is published with the permission of the Commission.

Download or read book Geological Survey Bulletin written by and published by . This book was released on 1980 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bulletin of the Geological Society of America written by Geological Society of America and published by . This book was released on 1910 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. 1-44 include Proceedings of the annual meeting, 1889-1933, later published separately.

Download or read book Il maussaq Alkaline Complex South Greenland written by Henning Sorensen and published by Museum Tusculanum Press. This book was released on 2006 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Ilimaussaq alkaline complex, South Greenland, the type locality of agpaitic nepheline syenites and of thirty minerals, among which arfvedsonite, eudialyte and sodalite, has been studied since 1806. The paper reviews the outcome of 200 years of geological investigations and presents an overview and a synthesis of the petrology of the complex. According to one model for the evolution of the complex, the nepheline syenites formed by consolidation of one magma batch in a closed system. The lujavrites were formed from the residual melts left after the formation of the roof series and the floor series and were sandwiched between these. A second model implies that the kakortokites and lujavrites formed from one or more separate magma pulses which intruded the already consolidated roof series rocks. This model is supported by new information on contact relations and especially on the petrology and geochemistry of a marginal pegmatitic fades that forms a rim around the kakortokite-lower aegirine lujavrite part of the complex. It consists of a massive-textured matrix intersected by pegmatites. The matrix was the first rock to form in the lowermost exposed part of the complex and gives information about the composition of the initial magma of the kakortokite-lujavrite sequence. It is concluded that the agpaitic rocks of the complex were formed from at least two successive magma injections, which formed respectively the roof series and the kakortokite-lujavrite sequence.

Download or read book U S Geological Survey Professional Paper written by and published by . This book was released on 1973 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Development Potential of Precambrian Mineral Deposits written by Sam Stuart and published by Elsevier. This book was released on 2013-10-02 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Development Potential of Precambrian Mineral Deposits covers several aspects of Precambrian mineral resource potential and assessment towards mineral exploration and mineral reserves. This book contains 27 chapters and begins with an overview of the world production and consumption of certain minerals. The next chapters describe the physical and chemical characteristics of certain mineral ores, as well as the mineral content of certain rock assemblages. These topics are followed by discussions of the geographical distribution of some ores, including discovered metal bearing zones in Africa. Considerable chapters are devoted to exploration techniques in tropical, temperate, and sub-arctic Precambrian areas. The remaining chapters examine the action of metamorphic and other geological processes in mobilizing ore minerals. The book will prove useful to geologists, researchers, and geology students.

Download or read book Economic Importance of Pegmatites written by Paul McIntosh Tyler and published by . This book was released on 1950 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of Pegmatite Bodies and Enclosing Rocks written by Alan Logan and published by . This book was released on 1967 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the 27th International Geological Congress written by and published by VSP. This book was released on 1984-12 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Mineral Resources of Greenland written by Sydney Hobard Ball and published by . This book was released on 1923 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Major and Trace Element Studies of Selected Granitic Pegmatites and Their Associated Wall Rocks in the Rumford District Maine written by Lawrence Albert Walters and published by . This book was released on 1965 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Encyclopedia of Mineralogy written by Keith Frye and published by Springer Science & Business Media. This book was released on 1981-12-31 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Encyclopedia of Mineralogy provides comprehensive, basic treatment of the science of mineralogy. More than 140 articles by internationally known scholars and research workers describe specific areas of mineralogical interest, and a glossary of 3000 entries defines all valid mineral species and many related mineral names. In addition to traditional topics - descriptions of major structural groups, methods of mineral analysis, and the paragenesis of mineral species - this volume embraces such subjects as asbestiform minerals, minerals found in caves and in living beings, and gems and gemology. It includes current data on the latest in our geological inventories - lunar minerals. It describes the properties, characteristics, and uses of industrial resources such as abrasive materials and Portland cement. A directory will guide traveling mineralogists to the major mineralogical museums of the world, with their special interests noted. Clear technical illustrations supplement the text throughout. To help the student and professional find particular information there are a comprehensive subject index, extensive cross-references of related topics (whether in this volume or others in the series), and reference lists to background information and detailed advanced treatment of all topics. The Encyclopedia of Mineralogy is a valuable reference and source for professionals in all geological sciences, for science teachers at all levels, for collectors and `rock hounds', and for all who are curious about the minerals on earth or those brought back from outer space.

Download or read book Geological Survey Professional Paper written by Geological Survey (U.S.) and published by . This book was released on 1957 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Beryllium written by Edward S. Grew and published by Walter de Gruyter GmbH & Co KG. This book was released on 2018-12-17 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 50 of Reviews in Mineralogy and Geochemistry treats Beryllium and its cosmogenic isotopes. This volume includes an overview of Be studies in the earth sciences and a systematic classification of Be minerals based on their crystal structure. It treats the analysis of these minerals by the secondary ion mass spectroscopy as well as experimental studies of systems involving Be. Moreover, this volume reviews the behavior of Be in the Solar System, with an emphasis on meteorites, the Moon and Mars, and the implications of this behavior for the evolution of the solar system. It gives an overview of the terrestrial geochemistry of Be and discusses the contamination of the environment by this anthropogenic toxin. It reports use of the longer lived Be-10 to assess erosion rates and other surficial processes and how this isotope can yield independent temporal records of geomagnetic field variations for comparison with records obtained by measuring natural remnant magnetization, be a chemical tracer for processes in convergent margins, and can date events in Cenozoic tectonics. It reviews applications of the shorter lived isotope Be-7 in environmental studies as well. Residual phases include acidic plutonic and volcanic rocks, whose geochemistry and evolution are covered, while granitic pegmatites, which are well-known for their remarkable, if localized, Be enrichments and a wide variety of Be mineral assemblages, are reviewed. Not all Be concentrations have obvious magmatic affinities; for example, one class of emerald deposits results from Be being introduced by heated brines. Pelitic rocks are an important reservoir of Be in the Earth's crust and their metamorphism plays a critical role in recycling of Be in subduction zones, eventually, anatectic processes complete the cycle, providing a source of Be for granitic rocks.

Download or read book Meddelelser Om Gr nland written by and published by . This book was released on 1923 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Eruptive Rocks written by Samuel James Shand and published by . This book was released on 1927 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Hagendorf Pleystein Province the Center of Pegmatites in an Ensialic Orogen written by Harald G. Dill and published by Springer. This book was released on 2015-10-15 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will broaden readers’ understanding of pegmatites in a special geodynamic setting, dealing with the emplacement of the Hagendorf-Pleystein Pegmatite Province (HPPP) in the Central European Variscides. This treatise illustrates the complex processes leading to the formation and partial destruction of the pegmatites, documenting the geochronological, chemical, mineralogical, geological and geomorphological / sedimentological data set. The book starts with a detailed account of the economic geology of the various pegmatites, explaining why these deposits are a major resource of ceramic raw materials. In its concluding section, a model of the pegmatite evolution in an ensialic orogen provides meaningful insights into the genetic aspects of pegmatite generation. The Late Paleozoic rare-element pegmatites of the HPPP, Oberpfalz-SE, Germany, rank among the largest concentrations in Europe. The biggest pegmatite of this mining district totals 4.4 million tons of ore (Hagendorf-South). The mining history of the HPPP is restricted to the 20th century, when local entrepreneurs started mining operations in search of ceramic raw materials, feldspar and quartz. Today the “Silbergrube Aplite” is still worked for feldspar. The traditional mining of pegmatitic and aplitic rocks in Central Europe, such as the Bohemian Massif, which is shared by Germany, the Czech Republic, Poland and Austria, has been focused on these industrial minerals. In addition to these major commodities, lithium was mined for a period of time. But even today many of these pegmatites of calc-alkaline affiliation have not lost their appeal to mineralogists and mineral enthusiasts for their wealth of minerals that contain P, Nb, Ta, Li, Be, B, U, Th, Sc, Ti and Sn. The most favorable crustal section to bring about pegmatitic rocks of this type, encompassing pegmatoids, metapegmatites, reactivated pseudopegmatites and pegmatites sensu stricto is the ensialic orogen, exemplified by the Variscan (Hercynian) Orogen, which geodynamically connects the Paleozoic pegmatite provinces in North America and Europe. The geological history of the HPPP, however, goes much further than the Carboniferous-Permian magmatic activity, when the last structural disturbances of the Variscan orogeny affected the NE-Bavarian Basement between 450 and 330 Ma. During this time mafic magmatic rocks together with calcareous and arenaceous sediments were converted into paragneisses, calcsilicate rocks, and amphibolites. It is the period of time when tectonic shortening led to over thrusting and when the emplacement of nappes and the architectural elements of the ensialic orogen began taking shape. During the Late Permian, the Mesozoic and the Cenozoic, the HPPP did not lie idle in geological terms; hypogene and supergene alteration continued and found its most recent expression in alluvial-fluvial “nigrine” placer deposits, which resulted from the unroofing of the pegmatites and aplites in the HPPP and can be used even outside HPPP as an ore guide to pegmatites.