Proterozoic Geology of the Southern Rocky Mountains
Author: Jeffrey A. Grambling
Publisher: Geological Society of America
Published: 1989-01-01
Total Pages: 184
ISBN-13: 0813722357
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Author: Jeffrey A. Grambling
Publisher: Geological Society of America
Published: 1989-01-01
Total Pages: 184
ISBN-13: 0813722357
DOWNLOAD EBOOKAuthor: L. Gordon Medaris
Publisher: Geological Society of America
Published: 1983-01-01
Total Pages: 151
ISBN-13: 0813711606
DOWNLOAD EBOOKAuthor: L. Gordon Medaris
Publisher: Geological Society of America
Published: 1983
Total Pages: 326
ISBN-13: 0813711614
DOWNLOAD EBOOKAuthor: P. K. Link
Publisher:
Published: 2007
Total Pages: 278
ISBN-13:
DOWNLOAD EBOOKThis volume is a compendium of research on the Belt Supergroup. It is an outgrowth of Belt Symposium IV, held in Salmon, Idaho, in July, 2003, in conjunction with the Tobacco Root Geological Society annual field conference. Because of the geographic extent and great thickness of the Belt Supergroup, years of work have been required before conclusions are "bona fide". The Mesoproterozoic Belt Supergroup of western Montana and adjacent areas is geologically and economically important, but it has been frustratingly hard to understand. The previous Belt Symposium volumes offer an historical view of the progress of the science of geology in the western United States. The advent of U-Pb geochronology, especially using the ion microprobe (SHRIMP) and laser-ablation ICPMS, has injected geochronometric reality into long-standing arguments about Belt stratigraphy. Several papers in this volume utilize these new tools to provide constraints on age and correlation of Belt strata (Chamberlain et al., Lewis et al., Link et al., and Doherty et al.)
Author: Richard P. Tollo
Publisher: Geological Society of America
Published: 2004-01-01
Total Pages: 900
ISBN-13: 9780813711973
DOWNLOAD EBOOKAuthor: Bruce Bryant
Publisher:
Published: 2001
Total Pages: 64
ISBN-13:
DOWNLOAD EBOOKAuthor: James E. Gill
Publisher: University of Toronto Press
Published: 1957-12-15
Total Pages: 204
ISBN-13: 1487597541
DOWNLOAD EBOOKProterozoic time produced much of great interest to geologists, and was of tremendous economic import to the people of Canada and the United States. Most of the iron deposits of the Lake Superior district, the Michigan copper deposits, the enormously important Sudbury nickel-copper-platinum deposits, the spectacular silver deposits of the Cobalt district, and all of the important uranium ores in the Shield area are considered to have formed during this period in geological time. Proterozoic rock groups include those Precambrian rocks which are least deformed and metamorphosed. Because of their important economic deposits, they have been examined in great detail in certain localities. The results of such examination, and of others which were for reconnaissance only, are summarized in this volume of the Royal Society of Canada. Suggestions are made for revision of previous interpretations of Precambrian history, and the terminology which grew out of them. Three papers deal with problems arising from the current use of the term Proterozoic, and with possible changes in its use to bring it more into accord with the facts. Contributors to this volume are: E.M. Abraham, Robert Bergeron, R.G. Blackadar, I.C. Brown, G.H. Charleswood, J.F. Davies, K.E. Eade, W.F. Fahrig, R.M. Farquhar, James E. Gill, H.C. Gunning, J.M. Harrison, D.F. Hewitt, W.W. Moorhouse, J.E. Reesor, S.M. Roscoe, R.D. Russell, James E. Thomson, Robert Thomson, L.J. Weeks, Alice E. Wilson, J.T. Wilson, G.M. Wright.
Author: K.C. Condie
Publisher: Elsevier
Published: 1993-02-03
Total Pages: 553
ISBN-13: 0080869092
DOWNLOAD EBOOKAs a final product of the International Geological Correlation Program (IGCP) Project 217, this volume brings together significant advances in the understanding of Proterozoic crustal evolution. This IGCP Project focussed on nine research objectives: 1) Comparison of Archean and Proterozoic supracrustal assemblages to more fully understand differences between Archean and post-Archean tectonic regimes; 2) To more fully understand the geochemical differences between Archean and post-Archean sediments and to evaluate the various factors that control sediment composition; 3) From combined U/Pb zircon and whole-rock Sm/Nd studies, to see if the apparent 2.4-2.0 continental crust "generation gap" is real; 4) To employ new techniques in the dating of individual zircons to more fully understand Proterozoic tectonic history and the role of crustal reworking; 5) From trace element ratios and Nd isotopic data from basalts, to better understand Proterozoic mantle evolution; 6) To encourage more detailed studies of the anorogenic granite-anorthosite association to better understand its origin and significance in terms of crustal evolution; 7) From combined Nd, Pb, and Sr isotopic data, to more precisely estimate the amount of new continental crust formed during the Proterozoic; 8) To encourage joint P-T and geochronological studies of Proterozoic and high-grade terranes to better understand Proterozoic orogenesis: and 9) To try and understand why hydrothermal precious metal deposits are relatively rare in the Proterozoic compared to both the Archean and the Phanerozoic. The book should be of interest to professionals in the geosciences (especially geochemists, petrologists and structural geologists) and graduate students in the same fields.
Author:
Publisher:
Published: 1991
Total Pages: 352
ISBN-13:
DOWNLOAD EBOOKAuthor: Paul Kibler Sims
Publisher:
Published: 1995
Total Pages: 20
ISBN-13:
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