Tectonic Subdivision and U-Pb Geochronology of the Crystalline Basement of the Alberta Basin, Western Canada


Book Description

The purpose of this study was to provide a more detailed understanding of the basement, which has implications for the assembly and tectonic evolution of the Canadian Sheld, the provenance of sediments in the Cordilleran orogen, the tectonic affinities of crystalline basement exposed in structural culminations in the southern Canadian Cordillera and the structure of the crust that forms the floor of the Western Canada Sedimentary Basin. The Precambrian basement underlying the Paleozoic rocks of the Western Canada Sedimentary Basin was studied by combining potential field (gravity and aeromagnetic) analysis with lithological and isotopic studies of crystalline basement samples. The 93 samples retrieved from hydrocarbon exploration wells are described and the geochronology and systematics of 50 of the samples are presented and interpreted. Monazite and titanite help delineate post-crystallization, regional thermal events. Data from 35 of the cores are presented and used to test and delineate models for the tectonic evolution of the region.
















Earth Accretionary Systems in Space and Time


Book Description

Accretionary orogens form at convergent plate boundaries and include the supra-subduction zone forearc, magmatic arc and backarc components. They can be broken into retreating and advancing types, based on their kinematic framework and resulting geological character.Accretionary systems have been active throughout Earth history, extending back until at least 3.2 Ga, and provide an important constraint on the initiation of horizontal motion of lithospheric plates on Earth. Accretionary orogens have been responsible for major growth of the continental lithosphere, through the addition of juvenile magmatic products, but are also major sites of consumption and reworking of continental crust through time.The aim of this volume is to provide a better understanding of accretionary processes and their role in the formation and evolution of the continental crust. Fourteen papers deal with general aspects of accretion and metamorphism and discuss examples of accretionary orogens and crustal growth through Earth history, from the Archaean to the Cenozoic.










The Geological Environment of the Sullivan Deposit, British Columbia


Book Description

Collected papers reporting on the results of the Sullivan Project.




The Precambrian Earth


Book Description

In this book the editors strive to cover all primary (i.e. non-applied) topics in Precambrian geology in a non-partisan way, by using a large team of international authors to present their datasets and highly divergent viewpoints. The chapters address: celestial origins of Earth and succeeding extraterrestrial impact events; generation of continental crust and the greenstone-granite debate; the interaction of mantle plumes and plate tectonics over Precambrian time; Precambrian volcanism, emphasising komatiite research; evolution and models for Earth's hydrosphere and atmosphere; evolution of life and its influence on Precambrian ocean chemistry and chemical sedimentation; sedimentation through Precambrian time; the application of sequence stratigraphy to the Precambrian rock record. Each topic is introduced and a non-partisan closing commentary provided at the end of each chapter. The final chapter blends the major geological events and rates at which important processes occurred into a synthesis, which postulates a number of "event clusters" in the Precambrian when significant changes occurred in many natural systems and geological environments. Also available in paperback, ISBN: 0-444-51509-7