Structural Geology and Kinematic Analysis of the Reef Creek Allochthon, Park County, Northwestern Wyoming
Author: Andro K. Wohlgenant
Publisher:
Published: 1997
Total Pages: 240
ISBN-13:
DOWNLOAD EBOOKPosts
Proterozoic Crustal Evolution
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.
Mesozoic Assembly of the North American Cordillera
Author: Robert S. Hildebrand
Publisher: Geological Society of America
Published: 2013-01-01
Total Pages: 182
ISBN-13: 0813724953
DOWNLOAD EBOOK"In this well-illustrated book, Hildebrand expands upon his model for the development of the North American Cordillera detailed in Special paper 457. Starting with an overview of Cordilleran geology he goes on to provide an in depth look at how the Rubian ribbon continent was assembled. He integrates the complex geology of the Cordillera into an actualistic model involving arc magmatism, arc-continent collision, slab failure magmatism, and transcurrent motion in both Rubia and the western North American margin. While much of the focus is on the assembly of the Rubian ribbon continent, Hildebrand explores its interactions with North America during the Sevier and Laramide events and concludes that North America was the lower plate in both"--Provided by publisher.
The Tectonic Setting and Origin of Cretaceous Batholiths within the North American Cordillera
Author: Robert S. Hildebrand
Publisher: Geological Society of America
Published: 2017-10-03
Total Pages: 123
ISBN-13: 0813725321
DOWNLOAD EBOOKIn this Special Paper, Hildebrand and Whalen present a big-picture, paradigm-busting synthesis that examines the tectonic setting, temporal relations, and geochemistry of many plutons within Cretaceous batholithic terranes of the North American Cordillera. In addition to their compelling tectonic synthesis, they argue that most of the batholiths are not products of arc magmatism as commonly believed, but instead were formed by slab failure during and after collision. They show that slab window and Precambrian TTG suites share many geochemical similarities with Cretaceous slab failure rocks. Geochemical and isotopic data indicate that the slab failure magmas were derived dominantly from the mantle and thus have been one of the largest contributors to growth of continental crust. The authors also note that slab failure plutons emplaced into the epizone are commonly associated with Cu-Au porphyries, as well as Li-Cs-Ta pegmatites.
Phanerozoic Tectonic Evolution of the Circum-North Pacific
Author: Warren J. Nokleberg
Publisher:
Published: 2001
Total Pages: 146
ISBN-13:
DOWNLOAD EBOOKBalanced Geological Cross-sections
Author: Nicholas B. Woodward
Publisher:
Published: 1989
Total Pages: 152
ISBN-13:
DOWNLOAD EBOOKEmergence and Evolution of Barbados
Author: Robert C. Speed
Publisher: Geological Society of America
Published: 2021-06-21
Total Pages:
ISBN-13: 0813725496
DOWNLOAD EBOOK"Chapter 1 shows that the windward slope of Barbados and its terraced morphology evolved principally by wave erosion during uplift and eustatic oscillation, rather than by biohermal growth. Chapter 2 describes the interplay of erosion and limestone deposition during eustatic oscillation over a span of 700,000 years. It represents the first comprehensive field and chronologic study to integrate marine erosion and deposition with tectonic uplift rates to determine emergence values and rates of the stratigraphic and evolutionary model. Chapter 3 describes the distributions, lithology, depositional environments, and ages of the limestone stratigraphic subunits for seven study areas in southeastern Barbados"--
Belt Basin: Window to Mesoproterozoic Earth
Author: John S. MacLean
Publisher: Geological Society of America
Published: 2016-06-01
Total Pages: 400
ISBN-13: 0813725224
DOWNLOAD EBOOKWith its thickness of more than 15 km of strata, covering some 200,000 km2, the Belt basin displays one of the planet's largest, best-exposed, most accessible, and best-preserved sequences of Mesoproterozoic sedimentary and igneous rocks. This volume focuses on research into this world-class province; kindles ideas about this critical era of Earth evolution; and covers aspects of the basin from its paleontology, mineralogy, sedimentology, and stratigraphy to its magmatism, ore deposits, geophysics, and structural geology.
Atlas of Deformational and Metamorphic Rock Fabrics
Author: G. J. Borradaile
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 550
ISBN-13: 3642684327
DOWNLOAD EBOOKIn May 1976 Lucian B. Platt organized a highly successful Penrose Confer ence on The Formation of Rock Cleavage at Bryn Mawr College in Penn sylvania, U. S. A. The meeting drew together about 70 specialists from both sides of the Atlantic and from Australasia, who contributed discussions on various aspects of rock cleavage and its formation. Even early in the meet ing it became clear to the participants that they lacked a common terminol ogy, that often the same technical word implied different things to different people and that observables and descriptors were loosely defined. In an at tempt to improve communication the present editors contacted about 190 workers after the conference with a view to compiling a set of photographs with captions to illustrate exactly what workers were talking about. As a re sult the compilation was published as a limited edition by an inexpensive offset process at the University of Tasmania. The success of that provisional edition of the Atlas of Rock Cleavage and the responses of the readers prompted us to make a more extensive collection of material, contact a wider range of workers and, with the support of Dr. Konrad Springer, to publish the present higher-quality reproduction of the contributors' plates.
