Author: Michael Walter Ammann
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Book Description

Author: M. W. Ammann
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
Absolute diffusion rates in minerals of the Earth's lower mantle are calculated from first principles using density functional theory. The agreement with the available experimental data is excellent and provides confidence in predicting diffusivities in regions of the lower mantle inaccessible to current experimental techniques. I have calculated the diffusivity of all constituting species in ferro-periclase ((Fe,Mg)O), (Fe,Mg)SiO3 perovskite and MgSiO3 post-perovskite. This enables me to put tight constraints on the viscosity of the Earth's lower mantle, and, in particular, on the viscosity of post-perovskite for which no experimental data are available. I find that perovskite deforming in diffusion creep can readily reproduce the Earth's lower mantle viscosity profile that has been inferred from inversion modelling. I also show that postperovskite is either much stiffer (if also deforming in diffusion creep) or up to four orders of magnitude weaker than perovskite (if deforming in dislocation creep). This leads to a new interpretation of the sharp seismic reflector in the lowermost lower mantle, known as D00, as the onset of a sudden rheological transition and the generation of a mineral texture therewith. Finally, I also find that the pressure induced high-to-low-spin transition of iron in ferro-periclase and perovskite has a negligible effect on the rheology of the lower mantle.

Author: Youxue Zahng
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 1501508393
Category : Science
Languages : en
Pages : 1056

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Book Description
Volume 72 of Reviews in Mineralogy and Geochemistry represents an extensive compilation of the material presented by the invited speakers at a short course on Diffusion in Minerals and Melts held prior (December 11-12, 2010) to the Annual fall meeting of the American Geophysical Union in San Francisco, California. The short course was held at the Napa Valley Marriott Hotel and Spa in Napa, California and was sponsored by the Mineralogical Society of America and the Geochemical Society.

Author: Hauke Marquardt
Publisher: John Wiley & Sons
ISBN: 1119528615
Category : Science
Languages : en
Pages : 32

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Book Description
A multidisciplinary perspective on the dynamic processes occurring in Earth's mantle The convective motion of material in Earth's mantle, powered by heat from the deep interior of our planet, drives plate tectonics at the surface, generating earthquakes and volcanic activity. It shapes our familiar surface landscapes, and also stabilizes the oceans and atmosphere on geologic timescales. Mantle Convection and Surface Expressions brings together perspectives from observational geophysics, numerical modelling, geochemistry, and mineral physics to build a holistic picture of the deep Earth. It explores the dynamic processes occurring in the mantle as well as the associated heat and material cycles. Volume highlights include: Perspectives from different scientific disciplines with an emphasis on exploring synergies Current state of the mantle, its physical properties, compositional structure, and dynamic evolution Transport of heat and material through the mantle as constrained by geophysical observations, geochemical data and geodynamic model predictions Surface expressions of mantle dynamics and its control on planetary evolution and habitability The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals.

Author: Anna V. Spivak
Publisher: Springer
ISBN: 3319785184
Category : Science
Languages : en
Pages : 103

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Book Description
This book sheds valuable new light on the genetic mineralogy of lower-mantle diamonds and syngenetic minerals. It presents groundbreaking experimental results revealing the melting relations of ultrabasic and basic associations and a physicochemical peritectic mechanism of their evolution. The experimental investigations included here reveal the key multicomponent, multiphase oxide-silicate-carbonate-carbon parental media for lower-mantle diamonds and syngenetic minerals. Consequently, readers will find extensive information on the diamond-parental oxide-silicate-carbonate-carbon melts-solutions that supplement the general features of lower-mantle diamond genesis and the most efficient ultrabasic-basic evolution. The experimental results on physicochemical aspects, combined with analytical mineralogy data, make it possible to create a generalized composition diagram of the diamond-parental melts-solutions, there by completing the mantle-carbonatite concept for the genesis of lower-mantle diamonds and syngenetic minerals. This book addresses the needs of all researchers studying the Earth’s deepest structure, super-deep mineral formation including diamonds, and magmatic evolution.

Author: Shun-ichiro Karato
Publisher: John Wiley & Sons
ISBN: 0470659149
Category : Science
Languages : en
Pages : 40

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Book Description
Though the deep interior of the Earth (and other terrestrial planets) is inaccessible to humans, we are able to combine observational, experimental and computational (theoretical) studies to begin to understand the role of the deep Earth in the dynamics and evolution of the planet. This book brings together a series of reviews of key areas in this important and vibrant field of studies. A range of material properties, including phase transformations and rheological properties, influences the way in which material is circulated within the planet. This circulation re-distributes key materials such as volatiles that affect the pattern of materials circulation. The understanding of deep Earth structure and dynamics is a key to the understanding of evolution and dynamics of terrestrial planets, including planets orbiting other stars. This book contains chapters on deep Earth materials, compositional models, and geophysical studies of material circulation which together provide an invaluable synthesis of deep Earth research. Readership: advanced undergraduates, graduates and researchers in geophysics, mineral physics and geochemistry.

Author: Hans Keppler
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 1501509470
Category : Science
Languages : en
Pages : 500

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Book Description
Volume 62 of Reviews in Mineralogy and Geochemistry reviews the recent research in the geochemistry and mineral physics of hydrogen in the principal mineral phases of the Earth's crust and mantle. Contents: Analytical Methods for Measuring Water in Nominally Anhydrous Minerals The Structure of Hydrous Species in Nominally Anhydrous Minerals: Information from Polarized IR Spectroscopy Structural Studies of OH in Nominally Anhydrous Minerals Using NMR Atomistic Models of OH Defects in Nominally Anhydrous Minerals Hydrogen in High Pressure Silicate and Oxide Mineral Structures Water in Nominally Anhydrous Crustal Minerals: Speciation, Concentration, and Geologic Significance Water in Natural Mantle Minerals I: Pyroxenes Water in Natural Mantle Minerals II: Olivine, Garnet and Accessory Minerals Thermodynamics of Water Solubility and Partitioning The Partitioning of Water Between Nominally Anhydrous Minerals and Silicate Melts The Stability of Hydrous Mantle Phases Hydrous Phases and Water Transport in the Subducting Slab Diffusion of Hydrogen in Minerals Effect of Water on the Equation of State of Nominally Anhydrous Minerals Remote Sensing of Hydrogen in Earth's Mantle

Author: Felix V. Kaminsky
Publisher: Springer
ISBN: 3319556843
Category : Science
Languages : en
Pages : 340

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Book Description
This book presents the first overview of the composition and structure of the Earth’s lower mantle. The first part focuses on the study of lower-mantle minerals, identified as inclusions in diamonds from different regions of the world. Three associations are established among the lower-mantle minerals: ultramafic, mafic, and carbonatic. The carbonatic association is of particular interest because it characterizes the media of natural diamond formation. In turn, the second part analyzes the structure of the lower mantle, revealing its heterogeneous composition. It is based on the results of experiments demonstrating phase transitions in lower-mantle minerals, and on seismological data. Deep-seated earthquakes point to the presence within the lower mantle of numerous seismic boundaries caused by mineral structure transitions. In closing, the last part of the book compares observed data with experimental data, highlighting several discrepancies that indicate Earth may have a more complex planetary history than previously assumed, and examining its primarily non-chondritic composition.

Author: G David Price
Publisher: Elsevier
ISBN: 0444535764
Category : Science
Languages : en
Pages : 657

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Book Description
Treatise on Geophysics: Mineral Physics, Volume 2, provides a comprehensive review of the current state of understanding of mineral physics. Each chapter demonstrates the significant progress that has been made in the understanding of the physics and chemistry of minerals, and also highlights a number of issues which are still outstanding or that need further work to resolve current contradictions. The book first reviews the current status of our understanding of the nature of the deep Earth. These include the seismic properties of rocks and minerals; problems of the lower mantle and the core-mantle boundary; and the state of knowledge on mantle chemistry and the nature and evolution of the core. The discussions then turn to the theory underlying high-pressure, high-temperature physics, and the major experimental methods being developed to probe this parameter space. The remaining chapters explain the specific techniques for measuring elastic and acoustic properties, electronic and magnetic properties, and rheological properties; the nature and origin of anisotropy in the Earth; the properties of melt; and the magnetic and electrical properties of mantle phases. Self-contained volume starts with an overview of the subject then explores each topic with in depth detail Extensive reference lists and cross references with other volumes to facilitate further research Full-color figures and tables support the text and aid in understanding Content suited for both the expert and non-expert

Author: Russell Julian Hemley
Publisher: de Gruyter
ISBN:
Category : Science
Languages : en
Pages : 700

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Book Description
Volume 37 of Reviews in Mineralogy moves from the complexity of rocks to their mineral components and finally to fundamental properties arising directly from the play of electrons and nuclei. This volume was prepared for a short course by the same t