Download or read book Deformation and Metamorphic History of a Proterozoic Terrane in Northern Cochetopa Creek Gunnison County Colorado written by Laura E. Coffman Perkins and published by . This book was released on 1986 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thougtit that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 31 (thesis year 1986) a total of 11 ,480 theses titles trom 24 Canadian and 182 United States universities. We are sure that this broader base tor these titles reported will greatly enhance the value ot this important annual reterence work. While Volume 31 reports theses submitted in 1986, on occasion, certain univer sities do re port theses submitted in previousyears but not reported at the time.
Download or read book Tectonic and Metamorphic History of the Proterozoic Red Creek Terrane Northeastern Uinta Mountains Utah written by Gregg Swayze and published by . This book was released on 1985 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structural Analysis of Proterozoic Rocks in Gunnison County Colorado written by Eric David Hetherington and published by . This book was released on 1991 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proterozoic Metamorphic and Tectonic Evolution of the Northern Colorado Front Range written by Meghan Hodgins and published by . This book was released on 1997 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Metamorphic and Structural Evolution of the Davis Peak Area Northern Park Range Colorado written by Joshua T. Sigler and published by ProQuest. This book was released on 2008 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Davis Peak area is a ~100 km 2 part of the northern Park Range, Colorado, comprised of a heterogeneous suite of high-grade metamorphic and associated ultramafic/mafic-to-felsic intrusive rocks. These rocks are part of an extensive province of Paleoproterozoic island-arc terranes exposed in basement-involved uplifts that extend southward from the Cheyenne belt in southeastern Wyoming. Modern interpretations contend that the accretion of these terranes began along the Cheyenne belt with the ~1.78-Ga accretion of the Green Mountain arc followed by accretion of the ~1.75-Ga Rawah arc to the southern margin of the Green Mountain arc along the Farwell Mountain-Lester Mountain suture zone. Rocks of the northernmost Park Range are commonly interpreted as part of the Green Mountain arc, however, the affinity of these rocks has not been studied in detail. This study has employed a broad range of techniques including detailed field mapping, petrographic analysis, thermobarometry, and radiometric dating to determine the affinity of high-grade metamorphic rocks and associated intrusive rocks in the Davis Peak area. Detailed geologic field mapping reveals that the Davis Peak area is primarily comprised of a heterogeneous suite of metamorphic rocks (Big Creek gneiss) that have been pervasively intruded by ultramafic/mafic-to-felsic plutonic rocks. This diverse assemblage of metamorphic and igneous rocks is broadly equivalent to lithologic units recognized in the Sierra Madre (southeastern Wyoming), which are interpreted as part of the Green Mountain arc. Thus this correlation suggests that Precambrian rocks of the Davis Peak area are also part of the Green Mountain arc. The penetrative fabric in the Davis Peak area is chiefly a northeast-southwest-striking foliation that has been locally overprinted by younger ductile-to-brittle deformations. This structural history is basically comparable to the deformational history manifested in the Precambrian rocks of the Sierra Madre and Medicine Bow Mountains. This potential correlation suggests that regionally extensive ductile deformation dated at ~1.75 Ga and late cataclastic deformation dated at ~1.6 Ga have affected the entire Green Mountain arc including the northern Park Range. The Big Creek gneiss is characterized by metapelitic garnet-biotite-sillimanite paragneisses, metavolcanic (sometimes garnet-bearing) amphibolites, and intercalated subordinate calc-silicate rocks. Thermobarometric results from these rocks suggest that the Davis Peak area experienced metamorphic P-T conditions of ~6 kb and 675 °C followed by a period of decompression at ~4 kb and ~650 °C. Several U-Pb radiometric ages from metamorphic monazite and titanite have been used to directly date metamorphism and suggest that two phases of metamorphism have affected the Davis Peak area at ~1752 Ma and ~1615-1565 Ma. Microstructural and compositional evidence from high-grade metamorphic rocks suggest that evidence for ~1752-Ma metamorphism is only locally preserved and that thermobarometric results chiefly reflect tectonothermal events at ~1.6 Ga. Furthermore, non-penetrative epidote-bearing slickensided surfaces in the Davis Peak area are comparable with similar surfaces dated at ~1.6 Ga associated with the Cheyenne belt thereby suggesting that late deformation and metamorphism in the Davis Peak area continued under greenschist-facies conditions. Additionally, thermobarometric results from this study are strikingly similar to results obtained south of the proposed Farwell Mountain-Lester Mountain suture zone suggesting that the proposed break in metamorphic grade across this boundary may not exist. If this conclusion is correct, it requires a revised tectonic scenario for this part of the Colorado province.
Download or read book Proterozoic Geology of the Southern Rocky Mountains written by Jeffrey A. Grambling and published by . This book was released on 1989 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Age Constraints on Early Proterozoic Deformation in the Northern Front Range Colorado written by Karin Marie Barovich and published by . This book was released on 1986 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Tectonic History of the Proterozoic Rocks in the Black Canyon of the Gunnison Colorado written by Micah J. Jessup and published by . This book was released on 2003 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal History of Early Proterozoic Metamorphic Terrane in the Park Dome Area Black Hills South Dakota written by Bradley J. Lindenbusch and published by . This book was released on 1994 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Precambrian Conterminous U S written by John C. Reed, Jr. and published by Geological Society of America. This book was released on 1993 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt: This wide-ranging discussion of Precambrian rocks includes contributions from a diverse array of authors actively engaged in investigations of various aspects of U.S. Precambrian geology. Summary discussions by the editors of the five major chapters place these contributions in a logical regional framework.
Download or read book Bibliography and Index of Geology written by and published by . This book was released on 1985 with total page 1208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Precambrian written by John Calvin Reed (Jr.) and published by . This book was released on 1993 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Archean Crustal Evolution written by K.C. Condie and published by Elsevier. This book was released on 1994-11-11 with total page 543 pages. Available in PDF, EPUB and Kindle. Book excerpt: The integration of Tectonics/Geochemistry, up-to-date reviews by leading scientists as well as a broad topical coverage of the Archean, are some of the features of this particular volume. As geochronology has progressed in the last 20 years, the Archean has continued to attract interest. Advancements in the understanding of Archean crustal and mantle evolution have progressed rapidly since the first International Archean Symposium in Western Australia (1970). The landmark for the Archean was the NATO Advanced Study Institute at Leicester (1975). At this meeting the Archean truly "came of age". Investigators from many different disciplines focused their expertise on the early history of the earth. For the first time, the nature of the atmosphere, oceans, and life during the Archean was an important part of an Archean symposium. During the most recent Archean Symposium in Perth in 1990, there was a shift in interest from field and trace element data to the new rapidly evolving high-precision U/Pb geochronology of Archean rocks and to detailed structural studies of both low and high grade Archean terrains. The terrane concept so widely applied to the Phanerozoic was proposed for the Archean Yilgarn Province in Western Australia and is now widely accepted for the Archean (as evident by the articles in this book). Plate tectonics is now widely accepted as the principal process that controls the history of continents and oceans. There are, though, well substantiated differences between Archean and post-Archean rocks that indicate that Archean tectonic regimes must have differed in some respects from modern ones. The question of how and to what degree did Archean plate tectonics differ from modern plate tectonics is treated in many of the chapters of this book. Altogether, the editor has presented a selection of articles that provide a fascinating insight into the latest observations in this field.
Download or read book Uranium Deposits of the World written by Franz J Dahlkamp and published by Springer Science & Business Media. This book was released on 2010-08-20 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume gathers and presents a massive collection of data on the location, quality and accessibility of uranium resources in nearly every region of the globe. This exhaustive, up-to-date reference is designed for practical use and arranged by four geographic regions: Asia, USA and Latin America, Europe, and Australia-Oceania and Africa.
Download or read book Hydrothermal Uranium Deposits written by Robert A. Rich and published by Elsevier Science & Technology. This book was released on 1977 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Publications of the Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 1989 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
