Microprobe monazite geochronology PDF Download
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Author: M.L. Williams
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: M.L. Williams
Publisher:
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Category :
Languages : en
Pages :
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Author: Joseph P. Kopera
Publisher:
ISBN:
Category : Folds (Geology)
Languages : en
Pages : 244
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Author: Lindsay E. Chasten
Publisher:
ISBN:
Category :
Languages : en
Pages : 194
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Monazite dating of rocks in the Black Hills area has led to a better understanding of the timing of tectonic events and episodes of mineral growth. However, detailed geochronologic studies have not been done on rocks from the Homestake Iron Formation. The objective of this study was to constrain the age of mineralization by analyzing monazite in rocks of the Homestake Formation, and to relate these ages to textures and episodes of mineral growth. Thin sections were investigated that represent a range of metamorphic conditions. Monazite was identified optically and using a scanning electron microscope, then U-Th-Pb dated with the Ultrachron. X-ray chemical maps were used to identify potential domains for which chemical ages were calculated. An allanite to monazite reaction was trapped in garnet that displayed yttrium zonation, indicating exhaustion of the allanite REE source during garnet growth. The reaction yields an age of 1757 ± 30 Ma, consistent with regional D2 related to the Trans-Hudson Orogen (THO). several regional tectonic events are represented by monazite ages in this study. A ~1850 Ma age of one monazite grain may be attributed to early southern THO activity, such as collission between the Wyoming craton and Dakota block. Regional D1 and D2 ages are well-represented. The ~1775 Ma ages are associated with D1 Yavapai island-arc collision to the south of the Black Hills. Some ~1670 Ma ages may have formed during far-field Mazatzal deformation to the south of the Yavapai terrane. The ~1715 Ma ages associated with intrusion of the Harney Peak Granite are prevalent in the Black Hills are considered a minimum age for mineralization. These ages have not yet been found in the Homestake Formation. This may be due to lower temperatures during mineralization that did not intersect a stability range of monazite, which experimentally forms at low temperatures and at a higher amphibolite facies grade. Several ~1300 and ~1200 Ma ages occur in lower-grade rocks and may have formed in the low-temperature stability range of monazite during the slow cooling period of the Black Hills.
Author: Geological Society of America. Meeting
Publisher:
ISBN:
Category :
Languages : en
Pages : 114
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Author:
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Category :
Languages : en
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This Open File is one of a series on detrital and diagenetic mineralogy of the Lower Cretaceous rocks of the Scotian basin and their on-land equivalent, the Chaswood Formation, resulting from a collaborative program initiated in 2001 between Saint Mary's University, the Geological Survey of Canada and the Nova Scotia Department of Natural Resources. This report provides the results of dating of detrital monazite and a preliminary interpretation of the paleogeography and sediment dispersion pattern inferred from this data. It provides an essential database for a forthcoming GSC Bulletin on the Chaswood Formation.
Author: Nils-Axel Morner
Publisher: BoD – Books on Demand
ISBN: 9535116436
Category : Science
Languages : en
Pages : 208
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Chronology is the backbone of history, and there is a wise saying stating there is no history without a chronology. Earths evolutionary history is built up by geochronology, i.e. time benchmarks upon which the geological history is built up step by step over its total time period of about 4.5 billion years. The first marker in this history is the Jack Hills zircon from Australia dated at about 4.4 GA. The most detailed records come from seasonal changes within annual varves. Stratigraphy provides the basic chronological ordering of layers by layers, units by units, fossil assemblage by assemblage, varves by varves, growth zone by growth zone, etc. The radiometric techniques implied the introduction of absolute age determinations. This book includes a combination of methodological presentations and related case studies, from where we learn about practical problems and achievements. Therefore, the book should be of basic interest both for scientists in their practical in field and laboratory, as well as for general educational purpose.
Author: Desmond E. Moser
Publisher: John Wiley & Sons
ISBN: 1119227240
Category : Science
Languages : en
Pages : 347
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Book Description
Microstructural Geochronology Geochronology techniques enable the study of geological evolution and environmental change over time. This volume integrates two aspects of geochronology: one based on classical methods of orientation and spatial patterns, and the other on ratios of radioactive isotopes and their decay products. The chapters illustrate how material science techniques are taking this field to the atomic scale, enabling us to image the chemical and structural record of mineral lattice growth and deformation, and sometimes the patterns of radioactive parent and daughter atoms themselves, to generate a microstructural geochronology from some of the most resilient materials in the solar system. First compilation of research focusing on the crystal structure, material properties, and chemical zoning of the geochronology mineral archive down to nanoscale Novel comparisons of mineral time archives from different rocky planets and asteroids and their shock metamorphic histories Fundamentals on how to reconstruct and date radiogenic isotope distributions using atom probe tomography Microstructural Geochronology will be a valuable resource for graduate students, academics, and researchers in the fields of petrology, geochronology, mineralogy, geochemistry, planetary geology, astrobiology, chemistry, and material science. It will also appeal to philosophers and historians of science from other disciplines.
Author: Matthew J. Kohn
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110561891
Category : Science
Languages : en
Pages : 596
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Petrochronology is a rapidly emerging branch of Earth science that links time (ages or rates) with specific rock-forming processes and their physical conditions. It is founded in petrology and geochemistry, which define a petrogenetic context or delimit a specific process, to which chronometric data are then linked. This combination informs Earth’s petrogenetic processes better than petrology or geochronology alone. This volume and the accompanying short courses address three broad categories of inquiry. Conceptual approaches chapters include petrologic modeling of multi-component chemical and mineralogic systems, and development of methods that include diffusive alteration of mineral chemistry. Methods chapters address four main analytical techniques, specifically EPMA, LA-ICP-MS, SIMS and TIMS. Mineral-specific chapters explore applications to a wide range of minerals, including zircon (metamorphic, igneous, and detrital/Hadean), baddeleyite, REE minerals (monazite, allanite, xenotime and apatite), titanite, rutile, garnet, and major igneous minerals (olivine, plagioclase and pyroxenes). These applications mainly focus on metamorphic, igneous, or tectonic processes, but additionally elucidate fundamental transdisciplinary progress in addressing mechanisms of crystal growth, the chemical consequences of mineral growth kinetics, and how chemical transport and deformation affect chemically complex mineral composites. Most chapters further recommend areas of future research.
Author: Desmond E. Moser
Publisher: John Wiley & Sons
ISBN: 1119227356
Category : Science
Languages : en
Pages : 901
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Book Description
Microstructural Geochronology Geochronology techniques enable the study of geological evolution and environmental change over time. This volume integrates two aspects of geochronology: one based on classical methods of orientation and spatial patterns, and the other on ratios of radioactive isotopes and their decay products. The chapters illustrate how material science techniques are taking this field to the atomic scale, enabling us to image the chemical and structural record of mineral lattice growth and deformation, and sometimes the patterns of radioactive parent and daughter atoms themselves, to generate a microstructural geochronology from some of the most resilient materials in the solar system. First compilation of research focusing on the crystal structure, material properties, and chemical zoning of the geochronology mineral archive down to nanoscale Novel comparisons of mineral time archives from different rocky planets and asteroids and their shock metamorphic histories Fundamentals on how to reconstruct and date radiogenic isotope distributions using atom probe tomography Microstructural Geochronology will be a valuable resource for graduate students, academics, and researchers in the fields of petrology, geochronology, mineralogy, geochemistry, planetary geology, astrobiology, chemistry, and material science. It will also appeal to philosophers and historians of science from other disciplines.
Author: A. J. Barber
Publisher: Geological Society of London
ISBN: 9781862391802
Category : Science
Languages : en
Pages : 308
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Book Description
This volume provides the first comprehensive account of the geology of Sumatra since the masterly synthesis of van Bemmelen (1949). Following the establishment of the Geological Survey of Indonesia, after WW II, the whole island has been mapped geologically at the reconnaissance level, with the collaboration of the geological surveys of the United States and the United Kingdom. The mapping programme, completed in the mid-1990s, together with supplementary data obtained by academic institutions and petroleum and mineral exploration companies, has resulted in a vast increase in geological information, which is summarized in this volume. The synthesis of structural controls on sedimentation and magmatism during the tectonic evolution of Sumatra since the late Palaeozoic has provided a background for the formation of economic deposits of metallic minerals, coal, oil and gas. The volume provides a sound basis for future geological research and for the exploration of the energy and mineral resources of the island.
