Author: R. K. WanlessPublisher:
ISBN:
Category : Geological time
Languages : en
Pages : 90
Book Description
Age Determinations and Geological Studies: K-Ar Isotopic Ages, Report 9
Author: R. K. WanlessPublisher:
ISBN:
Category : Geological time
Languages : en
Pages : 90
Book Description
Geological Survey Professional Paper
Author: Age Determinations and Geological Studies, K-Ar Isotopic Ages, Report 15
Author: R. D. StevensPublisher:
ISBN:
Category : Science
Languages : en
Pages : 68
Book Description
"Two hundred and eight potassium-argon age determinations carried out on Canadian rocks and minerals are reported. Each age determination is accompanied by a description of the rock and mineral concentrate used: brief interpretative comments regarding the geological significance of each age are also provided where possible. The experimental procedures employed are described in brief outline and the constants used in the calculation of ages are listed. Two geological time-scales are reproduced in tabular form for ready reference and an index of all Geological Survey of Canada K-Ar age determinations published in this format has been prepared using NTS quadrangles as the primary reference." --
U.S. Geological Survey Professional Paper
Author: Physics and Chemistry of the Earth
Author: L. H. AhrensPublisher: Elsevier
ISBN: 1483165558
Category : Science
Languages : en
Pages : 348
Book Description
Physics and Chemistry of the Earth, Volume VII focuses on three topics—orogenic fold-belts and a hypothesis of earth evolution; earthquake energy and magnitude; and meteoritic, solar, and terrestrial rare-earth distributions. This book consists of three chapters. Chapter 1 examines features of the distribution and history of the Precambrian fold-belts in relation to the theory of continental drift. The two kinds of information obtained from seismograph records—time readings and amplitude readings that provide information on the total seismic wave energy released in earthquakes—are elaborated in Chapter 2. Chapter 3 discusses the meteoritic and terrestrial matter in rare earth elements (REE). This publication is a good reference to students and researchers conducting work on earth science.
The Acadian Orogeny
Author: David C. RoyPublisher: Geological Society of America
ISBN: 9780813722757
Category : Science
Languages : en
Pages : 182
Book Description
Selected Studies of Archean Gneisses and Lower Proterozoic Rocks, Southern Canadian Shield
Author: G. B. MoreyPublisher: Geological Society of America
ISBN: 0813721822
Category : Science
Languages : en
Pages : 183
Book Description
U.S. Geological Survey Circular
Author: Geology of the Innuitian Orogen and Arctic Platform of Canada and Greenland
Author: H.P. TrettinPublisher: Geological Society of America
ISBN: 081375450X
Category : Science
Languages : en
Pages : 581
Book Description
Fourteen chapters discuss regional stratigraphy by time intervals from Precambrian to Quaternary, while other chapters describe the geography, geomorphology, tectonics, geophysical characteristics, and resources of the region. A summary chapter includes geologic maps, structural cross-sections, a geotectonic correlation chart, a gravity map, and a location map for exploration wells in the Arctic Islands and northern Greenland. A wealth of additional information is contained on the nine accompanying plates.
The Arctic Ocean
Author: Alan NairnPublisher: Springer
ISBN: 1475712480
Category : Science
Languages : en
Pages : 684
Book Description
This trip backward in time capsulizes in a general way the geologic development of the area that is now northern Alaska. The Cretaceous through Recent history is predominantly one of erosion of the ancient Brooks Range and filling of the Colville Geosyncline under processes like those in Operation today. All the rocks older than Jurassic, however, were deposited far from their present sites. One of the intriguing tectonic puzzles involves the geographic positions and relative timing of events that occurred during the orogeny that built the Brooks Range. I suggest that pre-Cretaceous deposition took place far to the north along the western margin of the Caledonides. Subsequently, the region that is now northern Alaska moved southward and impinged upon a northward moving plate, or plates, from the Pacific region. Interactions between these two major parts of the earth's crust produced the Brooks Range during the Jurassic. Later developments reflect continuing readjustments of the northern third of of thrust Alaska as southward movement was dissipated in diverse systems faulting and lateral displacement. ACKNOWLEDGMENTS I am indebted to many colleagues who, during the past 30 years, shared with me the excitement and pleasures of exploring the geology of northern Alaska. Among these are W. P. Brosge, H. N. Reiser, R. L. Detterman, A. K. Armstrong, A. L. Bowsher, E. G. Sable, I. L. Tailleur, C. G. Mull, M. D. Mangus, A. H. Lachenbruch, M. C. Lachenbruch, R. L. Morris, C. J.