Author: Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 64
Book Description
Geological Survey Bulletin
Author: Geological Survey Professional Paper
Author: Committee Prints
Author: United States. Congress. Senate. Committee on Interior and Insular AffairsPublisher:
ISBN:
Category :
Languages : en
Pages : 1466
Book Description
Geological Survey Professional Paper
Author: Geological Survey (U.S.)Publisher:
ISBN:
Category :
Languages : en
Pages : 268
Book Description
U.S. Geological Survey Professional Paper
Author: U.S. Geological Survey Bulletin
Author: Proterozoic Crustal Evolution
Author: K.C. CondiePublisher: Elsevier
ISBN: 0080869092
Category : Science
Languages : en
Pages : 553
Book Description
As 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.
Mineral Resources of the Harquahala Mountains Wilderness Study Area, La Paz and Maricopa Counties, Arizona
Author: Publisher:
ISBN:
Category : Arrastra Mountain/Peoples Canyon Wilderness (Ariz.)
Languages : en
Pages : 268
Book Description
Principal Deposits of Strategic and Critical Minerals in Arizona
Author: Bibliography of North American Geology
Author: Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 1032
Book Description
1919/28 cumulation includes material previously issued in the 1919/20-1935/36 issues and also material not published separately for 1927/28. 1929/39 cumulation includes material previously issued in the 1929/30-1935/36 issues and also material for 1937-39 not published separately.