Download or read book Oceanic Lithosphere Magnetization Marine Magnetic Investigations of Crustal Accretion and Tectonic Processes in Mid Ocean Ridge Environments written by and published by . This book was released on 2007 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: The origin of symmetric alternating magnetic polarity stripes on the seafloor is investigated along East Pacific Rise (EPR) (9 degrees 25' -9 degrees 55'N) and Kane Megamullion (KMM) (23 degrees 40'N) in the Atlantic. At the EPR, along-axis variations in the axial magnetic anomaly result from changing source layer thickness, consistent with observed changes in seismic Layer 2a. The extrusive basalts therefore constitute the magnetic source layer along the ridge axis and long term crustal accretion patterns are reflected in the axial anomaly appearance. At KMM the C2r.2r/C2An. 1n (approx. 2.581 Ma) polarity reversal boundary is recorded by lower crust (gabbro) and upper mantle (serpentinized peridotites) rocks exposed on the seafloor by detachment faulting. Both lithologies have stable remanent magnetization, capable of contributing to the magnetic source layer. The geometry of the polarity boundary in the northern KMM region, interpreted to be a gabbro pluton, dips away from the ridge axis and is consistent with a rotated conductively cooled isotherm. In the central region the boundary in the serpentinized peridotites dips towards the ridge axis and is thought to represent an alteration front. The linear appearance of the polarity boundary across the two regions suggests that both lithologies acquired their remanence at approximately the same time.
Download or read book The Oceanic Lithosphere written by Cesare Emiliani and published by Harvard University Press. This book was released on 2005-06 with total page 1758 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oceanic Lithosphere Magnetization written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution September 2007.
Download or read book Heat Flow and Magnetization in the Oceanic Lithosphere written by Kjell Lennart Hayling and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Two aspects of the processing and interpretation of satellite measurements of the geomagnetic field are described. One deals with the extraction of the part of the geomagnetic field that originates from sources in the earth's lithosphere. The other investigates the possibility of using the thermal state of the oceanic lithosphere to further constrain modelling and interpretation of magnetic anomalies. We show that some of the magnetic signal in crustal anomaly maps can be an artifact of the mathematical algorithms that have been used to separate the crustal field from the observed data. Strong magnetic anomalies can be distorted but are probably real, but weak magnetic anomalies can arise from leakage of power from short wavelengths, and will also appear in anomaly maps as repetitions of the strong crustal anomaly. The distortion and the ghost anomalies follow the magnetic dip lines in a way that is similar to actual MAGSAT anomaly fields. This phenomenon will also affect the lower degree spherical harmonic terms in the power spectrum of the crustal field."--Page [i].
Download or read book The Magnetic Field of the Earth s Lithosphere written by R. A. Langel and published by Cambridge University Press. This book was released on 1998-07-13 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 1998 book documents the collection, processing and analysis of satellite magnetic field data.
Download or read book Anomalous Magnetic Field of the World Ocean written by Alexander M. Gorodnitsky and published by CRC Press. This book was released on 1994-10-12 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book investigates the anomalous magnetic field of the ocean and its connection with geological structure, tectonic evolution of the oceanic lithosphere, and magnetic properties of different rock types in the oceanic crust. The book describes new instruments and techniques of gradient magnetic measurements with three sensors, as well as the new technique of processing and interpretating hydromagnetic data on the basis of adoptive filtration and reparametrization. The text provides unique data of geomagnetic surveys carried out by Russian research vessels in different regions of the World Ocean, including submersible apparatus and ingenious theoretical and experimental technology of the magnetic modeling and investigations of the nature of magnetic anomalies. The results of systems analysis of geochemical content and composition during the mid-oceanic ridge basalt are presented.
Download or read book Modelling and Interpretation of Magnetisation in the Oceanic Lithosphere written by Sheona Madeleine Masterton and published by . This book was released on 2010 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rock and Mineral Magnetism written by W. O'Reilly and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: The past two decades have witnessed a revolution in the earth sciences. The quantitative, instrument-based measurements and physical models of. geophysics, together with advances in technology, have radically transformed the way in which the Earth, and especially its crust, is described. The study of the magnetism of the rocks of the Earth's crust has played a major part in this transformation. Rocks, or more specifically their constituent magnetic minerals, can be regarded as a measuring instrument provided by nature, which can be employed in the service of the earth sciences. Thus magnetic minerals are a recording magnetometer; a goniometer or protractor, recording the directions of flows, fields and forces; a clock; a recording thermometer; a position recorder; astrain gauge; an instrument for geo logical surveying; a tracer in climatology and hydrology; a tool in petrology. No instrument is linear, or free from noise and systematic errors, and the performance of nature's instrument must be assessed and certified. This has been the task of the research worker in rock and mineral magnetism.
Download or read book Plate Tectonics A Very Short Introduction written by Peter Molnar and published by Oxford University Press, USA. This book was released on 2015 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: La 4e de couv. indique : "The concept of plate tectonics is relatively new - it was only in the 1960s that the idea that continents drifted with respect to one another came to be accepted. Plate tectonics now forms one of geology's basic principles and explains much of the large-scale structure and phenomena we see on Earth today. In this Very Short Introduction Peter Molnar explores the impact that plate tectonics has had on our understanding of Earth : how the ocean floor forms, widens, and disappears ; why earthquakes and volcanoes are found in distinct zones ; and how the great mountain ranges of the world were built. As the Himalaya continues to grow, the Atlantic widens, and new ocean floor is forming, the mechanisms of plate tectonics continue to alter the surface of our planet."
Download or read book Magnetization of Oceanic Crust Near Selected Areas of Hydrothermal Activity on the Mid Atlantic and Gorda Ridges written by Anita L. Wooldridge and published by . This book was released on 1990 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrogeology of the Oceanic Lithosphere with CD ROM written by Earl E. Davis and published by Cambridge University Press. This book was released on 2004-12-09 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, first published in 2004, reviews the subject of the nature, causes, and consequences of fluid flow in oceanic crust.
Download or read book Magnetization of the Oceanic Crust Thermoremanent Magnetization Or Chemical Remanent Magnetization written by C. A. Raymond and published by . This book was released on 1987 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: We propose a model in which chemical remanent magnetization (CRM) acquired within the first 20 m.y. of crustal evolution may account for 80% of the bulk natural remanent magnetization of older basalts. The CRM of the crust is acquired as the original thermoremanent magnetization (TRM) is lost through low-temperature alteration. The CRM intensity and direction are controlled by the post emplacement polarity history. This model explains several independent observations observations concerning the magnetization of the oceanic crust. The model accounts for amplitude and skewness discrepancies observed in both the intermediate-wavelength satellite field and the short-wavelength sea surface magnetic anomaly pattern. It also explains the decay of magnetization away from the spreading axis and the enhanced magnetization of the Cretaceous Quiet Zones, while predicting other systematic variations with age in the bulk magnetization of the oceanic crust. The model also explains discrepancies in the anomaly skewness parameter observed for anomalies of Cretaceous age. Our study also indicates varying rates of TRM decay in very young crust which depicts the advance of low-temperature alternation through the magnetize layer.
Download or read book Implications of Fine Scale Magnetics for the Structure and Evolution of Slowly Accreted Oceanic Crust written by and published by . This book was released on 1997 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The long range objective of this program is to understand the structure of oceanic crust created at slow-spreading ridges by investigating the patterns of magnetization that reside in the crust. The project seeks to investigate how crustal magnetic fields are related to the structural deformation history of oceanic crust formed in slow spreading environments and how magnetization may be used to predict the properties of the underlying crust. Scientific Objectives are: (1) Investigate the relationship between crustal magnetization and the tectonic structure and architecture of oceanic crust by comparing the magnetization patterns of crust created at 'inside corners' versus 'outside corners' of ridge segment offsets. (2) Investigate the relationship between crustal magnetization and cyclic magmatic and tectonic processes involved in crustal formation and how this magnetization signal varies with age. (3) Investigate along-axis variability in crustal magnetization within a ridge segment and compare with the ridge axis signal. (4) Map magnetic isochrons to provide temporal framework for other related studies e.g. investigate how crustal structure and seafloor morphology change with spreading rate.
Download or read book NASA Geodynamics Program written by and published by . This book was released on 1984 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ophiolites and Oceanic Crust written by Yildirim Dilek and published by Geological Society of America. This book was released on 2000-01-01 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings from the September 1998 conference in Marshall, California contain 39 papers on the following topics: ophiolites, ocean crust, and global tectonics; oceanic lower crust and upper mantle; structure and physical properties of upper oceanic crust; hydrothermal processes; Pacific Rim ophiolites; and, Ophiolites from Iapetus, Rheic-Pleionic, Neotethyan, and Indian Oceans. Contributors include scientists with backgrounds in structural geology, tectonics, geophysics, petrology, and geochemistry. Numerous black and white illustrations (and one in color) are included. Annotation copyrighted by Book News Inc., Portland, OR
Download or read book Tectonic Magmatic Hydrothermal and Biological Segmentation of Mid ocean Ridges written by C. J. MacLeod and published by Geological Society of London. This book was released on 1996 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Genesis Flood Revisited written by Andrew Snelling and published by New Leaf Publishing Group. This book was released on 2022-10-25 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeled after the 1961 ground-breaking book The Genesis Flood by Drs. Whitcomb and Morris, this detailed work builds on that classic volume with new insights from decades of work by the author, Dr. Andrew Snelling, and numerous colleagues. This recent revolution in geology and the explosion in geological research have established an even firmer basis for understanding the biblical Flood with a God-honoring foundation — the absolute authority and inerrancy of God’s Word. Examine details of the Creation Week as it builds a solid scriptural case for the Flood’s catastrophic nature and global extent. Find decisive answers to many questions about the Flood and Noah’s Ark, its construction, and the animals taken onboard. Delve deeply into astonishing geological details that unfold from the early chapters of Genesis, including the Creation Week and the pre-Flood world. Explore detailed evidence and a concise, informative 30-page color section with diagrams, maps, and more! Dr. Snelling jettisons the faulty evolutionary-uniformitarian assumptions used by most geologists and instead, interprets compelling new geological and observed field data within the biblical framework for the earth’s history. He also demonstrates that fossils were catastrophically buried in sedimentary layers being deposited rapidly on a global scale on the continental plates derived from the violent rifting apart of the original supercontinent. His work demolishes radiometric dating, the icon of the millions of years dogma, and builds a thoroughly powerful case for a young earth that explains many geological features such as varves, evaporites, coal, oil, chalk, granites, and more that biblical skeptics sadly have used to scoff at God’s Word. Discover the powerful truth behind the earth’s most enduring mysteries!
