Field, Geochronologic, and Geochemical Constraints on the Early Mesozoic Paleogeographic and Tectonic Evolution of the Central Klamath Mountains, California
Field, Geochronologic, and Geochemical Constraints on the Early Mesozoic Paleogeographic and Tectonic Evolution of the Central Klamath Mountains, California

Author: Hannah Howell Scherer

Publisher:

Published: 2006

Total Pages: 398

ISBN-13: 9780542895814

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Rodingites and metabasalts are present in a serpentinite matrix melange in the North Fork terrane. Low-grade metabasalts and low-Mg rodingites both have strong MORB trace element signatures. The most significant chemical changes that occurred during Ca-metasomatism are an increase in the concentration of CaO between 100 to 290% relative to the average metabasalt found in the melange, and the loss of K2O, Na2O, Ba, Rb, Cs, and Sr at levels close to 100%.

Continent Formation Through Time
Continent Formation Through Time

Author: N.M.W. Roberts

Publisher: Geological Society of London

Published: 2015-02-16

Total Pages: 356

ISBN-13: 1862393753

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The continental crust is our archive of Earth history, and the store of many natural resources; however, many key questions about its formation and evolution remain debated and unresolved: What processed are involved in the formation, differentiation and evolution of continental crust, and how have these changed throughout Earth history?How are plate tectonics, the supercontinent cycle and mantle cooling linked with crustal evolution?What are the rates of generation and destruction of the continental crust through time?How representative is the preserved geological record? A range of approaches are used to address these questions, including field-based studies, petrology and geochemistry, geophysical methods, palaeomagnetism, whole-rock and accessory-phase isotope chemistry and geochronology. Case studies range from the Eoarchaean to Phanerozoic, and cover many different cratons and orogenic belts from across the continents.

Backbone of the Americas
Backbone of the Americas

Author: Suzanne Mahlburg Kay

Publisher: Geological Society of America

Published: 2009

Total Pages: 292

ISBN-13: 0813712041

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"The American Cordilleras form a continuous orogen that extends for 12,500 km along the eastern flank of the Pacific Ocean from Arctic to Antarctic latitudes as an integral part of the circum-Pacific orogenic belt. Following two summary chapters on the overall anatomy and evolution of North and South American segments of the orogenic system, this volume includes ten seminal chapters dealing with salient aspects of the key geodynamic processes that have accompanied Cordilleran geotectonic evolution: forearc terrane accretion, arc magmatism, shallow subduction, and backarc intracontinental deformation. The papers in this volume were selected from those presented at the 2006 Backbone of the Americas Meeting, which was sponsored jointly by multiple North and South American geological societies in Mendoza, Argentina."--pub. desc.