Download or read book Anomalous remanent Magnetization of Basalt a study of causes of anomalous magnetization with analysis of field and experimental data to show that lightning probably produced anomalous magnetization in Basalts in Idaho written by Allan Cox and published by . This book was released on 1961 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Anomalous Remanent Magnetization of Basalt written by Allan Verne Cox and published by . This book was released on 1961 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of causes of anomalous magnetization with analysis of field and experimental data to show that lightning probably produced anomalous magnetization in basalts in Idaho.
Download or read book Anomalous Remanent Magnetization of Basalt written by Allan Cox and published by . This book was released on 1961 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental and Theoretical Geophysics Anomalous Remanent Magnetization of Basalt a Study of Causes of Anomalous Magnetization with Analysis of Field and Experimental Data to Show that Lightning Probably Produced Anomalous Magnetization in TRUNCATED written by Geological Survey (U.S.) and published by . This book was released on 1960 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental and Theoretical Geophysics written by Geological Survey (U.S.) and published by . This book was released on 1959 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Periodic Heat Flow in a Stratified Medium with Application to Permafrost Problems written by Arthur H. Lachenbruch and published by . This book was released on 1959 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: A discussion of temperature fluctuiations in a stratified medium caused by a periodically varying surface temperature with special reference to the effects of seasonal temperature variation on gravel fills, the natural active layer and permafrost.
Download or read book Geological Survey Bulletin written by and published by . This book was released on 1962 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1961 with total page 1878 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Economic Geology and the Bulletin of the Society of Economic Geologists written by and published by . This book was released on 1961 with total page 1800 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Economic Geology written by and published by . This book was released on 1961 with total page 910 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Magnetic Modeling of Total Field Anomalies written by Hau-Ran Wang and published by . This book was released on 1980 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Estimation of basalt thickness through analysis of total field magnetic anomalies was accomplished along two traverses near Reardan, Washington, 30 kilometers west of Spokane, on the Columbia Plateau. The magnetization of basalt is much greater than that of the granitic basement rocks, and therefore, the magnetic anomalies can be attributed to the basalt flows. Measurements of the total geomagnetic field were made with a proton magnetometer along the two traverses. The traverses were located over basaltic terrain of low topographic relief adjacent to wells for which logs were available. The magnetic profile of each traverse was detrended to get the residual total field anomaly. Paleomagnetic sampling, consisting of taking oriented specimens of basalt and granitic basement rocks, was done in Spring Creek Canyon 5 kilometers north of the location of the traverses. The magnetization of 92 oriented specimens revealed the presence of two distinct layers of magnetization, one reversely magnetized and the other normally magnetized. Two-dimensional mode.ls incorporating these layers were constructed, and a computer program was used to calculate the total field anomaly profiles over these models. The models were adjusted to bring the calculated profiles into close approximation to the observed profiles. The basalt thickness in these models compares with that revealed in the well logs. This study shows that such modeling of total magnetic field anomalies is useful for determining basalt thickness. The method may have practical value for locating groundwater in basalt aquifers and for uranium prospecting along basalt margins"--Document.
Download or read book Remanent Magnetization of the Late Yakima Basalt Washington State written by Jan David Rietman and published by . This book was released on 1966 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Magnetic Paleointensities in Fault Pseudotachylytes and Implications for Earthquake Lightnings written by Natalie Ruth Leibovitz and published by . This book was released on 2016 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fault pseudotachylytes commonly form by frictional melting due to seismic slip. These fine-grained clastic rocks result from melt quenching and may show a high concentration of fine ferromagnetic grains. These grains are potentially excellent recorders of the rock natural remanent magnetization (NRM). The magnetization processes of fault pseudotachylytes are complex and may include the following: i) near coseismic thermal remanent magnetization (TRM) acquired upon cooling of the melt; ii) coseismic lightning induced remanent magnetization (LIRM) caused by earthquake lightnings (EQL); iii) post seismic chemical remanent magnetization (CRM) related to both devitrification and alteration. Deciphering these magnetization components is crucial to the interpretation of paleointensities to see if coseismic phenomena such as EQL’s were recorded within these rocks. Hence the paleomagnetic record of fault pseudotachylytes provides an independent set of new constraints on coseismic events. Fault pseudotachylytes from the Santa Rosa Mountains, California host a magnetic assemblage dominated by stoichiometric magnetite, formed from the breakdown of ferromagnesian silicates and melt oxidation at high temperature. Magnetite grain size in these pseudotachylytes compares to that of magnetite formed in friction experiments. Paleomagnetic data on these 59 Ma-old fault rocks reveal not only anomalous magnetization directions, inconsistent with the coseismic geomagnetic field, but also anomalously high magnetization intensities. Here we discuss results of rock magnetism and paleointensity experiments designed to quantify the intensity of coseismic magnetizing fields. The REM’ paleointensity method, previously tested on meteorites, is particularly well suited to investigate NRMs resulting from non-conventional and multiple magnetization processes. Overall findings indicate an isothermal remanent magnetization (IRM) in some, but not all, specimens taken from four different Santa Rosa pseudotachylyte samples. The cause of this IRM may be attributed to an LIRM produced by ground lightning (less likely), LIRM produced by an EQL (more likely), or a VRM imparted during laboratory preparation (not likely). The anomalously high NRM recorded in a few specimens points to LIRM as the most likely explanation for the dominant origin of magnetization.
Download or read book Anomalous Remanent Magnetization of Some Klamath River Andesites written by Donald Frederick Heinrichs and published by . This book was released on 1964 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: A section of the Western Cascade series of Tertiary volcanics with anomalous remanent magnetization directions was sampled. Five anomalous flows and three stable flows are studied in detail. The direction and intensity of the natural remanent magnetization (NRM) is measured before and after demagnetization experiments. The direction of the NRM vectors in the anomalous flows is almost horizontal in contrast to the usual sixty degree magnetic inclinations of the adjacent stable flows. The declinations of contiguous anomalous flows alternate between approximately twenty and two hundred degrees. The declinations, plus or minus 180 degrees, are consistent with the series as a whole. A study of the mineralogy shows that all the anomalous flows are slightly altered (propylitized) and that four of the five flows have a well-developed flow structure. Different mineral parameters were examined and plotted against variations in the magnetic properties of the flows, but the exact mechansim of the formation of the anomalous magnetic directions remains unknown. (Author).
Download or read book Investigation of the Upper Mantle as a Source for Contribution to Magnetic Anomalies written by Sarah Alyson Friedman and published by . This book was released on 2015 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation consists of four chapters, each of which is either published in a peer-reviewed journal, or in submission. These chapters developed from the testing of the hypothesis that the lithospheric mantle contains significant magnetic regions that contribute to the magnetism observed/measured, either at or close to the Earth’s surface, or from satellite data. Chapter 1 “Eight good reasons why the mantle could be magnetic” (2014) published in Tectonophysics by Ferré, Friedman, Martín-Hernández, Feinberg, Till, Ionov and Conder, addresses the motivation for this project and establishes the probability of upper mantle contribution to magnetic anomalies. My role with this manuscript was to produce figures using my previously collected data (Figures 2, 4, and 6), compile known data on the magnetic properties of minerals in mantle peridotites (Table 1), provide discussion for and against each argument made, and edited the manuscript. Chapter 2 “Remanent magnetization in fresh xenoliths derived from combined demagnetization experiments: Magnetic mineralogy, origin and implications for mantle sources of magnetic anomalies” (2014) published in Tectonophysics by Martín-Hernández, Ferré, and Friedman, investigates the natural remanent magnetization of mantle xenoliths. Notably, it establishes that the natural remanent magnetization of these xenoliths is derived from a thermoremanent magnetization (primary) and not from chemical remanent magnetization (secondary) origin. My primary role in this study was to provide preliminary magnetic and petrologic data and analysis of the samples. Secondary responsibilities were to prepare the samples, edit the manuscript and provide discussion on the results. Chapter 3 “Craton vs. rift uppermost mantle contributions to magnetic anomalies in the United States interior” (2014) published in Tectonophysics by Friedman, Feinberg, Ferré, Demory, Martín-Hernández, Conder, and Rochette begins to compare magnetic properties across different tectonic settings. The metasomatized cratonic upper mantle of the United States interior contains ferromagnetic phases that exist at temperatures lower than the Curie temperature. This upper mantle would likely contribute to magnetic anomalies. Alternatively, the high geotherm and sulfide-rich mantle near the Rio Grande Rift precludes this area from mantle contribution to magnetic anomalies. As first author I prepared samples, ran experiments, processed data, produced figures, wrote the manuscript and applied for funding. Chapter 4 “What is magnetic in the mantle wedge?” (2015) submitted to Geology, examines the mantle wedge beneath multiple island arcs. Magnetic anomalies in island arc settings have been attributed to a serpentinized mantle wedge. While this material is not available to test, metasomatized mantle, common to the mantle wedge, is available. Metasomatized mantle is mostly paramagnetic, and thus supports that stepwise dehydration of a subducting slab may produce positive and negative anomalies in the mantle wedge. As first author I prepared samples, ran experiments, processed data, produced figures, wrote the manuscript and applied for funding.
Download or read book Investigation of the Upper Mantle as a Source for Contribution to Magnetic Anomalies written by Sarah Alyson Friedman (‡e author) and published by . This book was released on 2015 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation consists of four chapters, each of which is either published in a peer-reviewed journal, or in submission. These chapters developed from the testing of the hypothesis that the lithospheric mantle contains significant magnetic regions that contribute to the magnetism observed/measured, either at or close to the Earth's surface, or from satellite data. Chapter 1 “Eight good reasons why the mantle could be magnetic” (2014) published in Tectonophysics by Ferré, Friedman, Martín-Hernández, Feinberg, Till, Ionov and Conder, addresses the motivation for this project and establishes the probability of upper mantle contribution to magnetic anomalies. My role with this manuscript was to produce figures using my previously collected data (Figures 2, 4, and 6), compile known data on the magnetic properties of minerals in mantle peridotites (Table 1), provide discussion for and against each argument made, and edited the manuscript. Chapter 2 “Remanent magnetization in fresh xenoliths derived from combined demagnetization experiments: Magnetic mineralogy, origin and implications for mantle sources of magnetic anomalies” (2014) published in Tectonophysics by Martín-Hernández, Ferré, and Friedman, investigates the natural remanent magnetization of mantle xenoliths. Notably, it establishes that the natural remanent magnetization of these xenoliths is derived from a thermoremanent magnetization (primary) and not from chemical remanent magnetization (secondary) origin. My primary role in this study was to provide preliminary magnetic and petrologic data and analysis of the samples. Secondary responsibilities were to prepare the samples, edit the manuscript and provide discussion on the results. Chapter 3 “Craton vs. rift uppermost mantle contributions to magnetic anomalies in the United States interior” (2014) published in Tectonophysics by Friedman, Feinberg, Ferré, Demory, Martín-Hernández, Conder, and Rochette begins to compare magnetic properties across different tectonic settings. The metasomatized cratonic upper mantle of the United States interior contains ferromagnetic phases that exist at temperatures lower than the Curie temperature. This upper mantle would likely contribute to magnetic anomalies. Alternatively, the high geotherm and sulfide-rich mantle near the Rio Grande Rift precludes this area from mantle contribution to magnetic anomalies. As first author I prepared samples, ran experiments, processed data, produced figures, wrote the manuscript and applied for funding. Chapter 4 “What is magnetic in the mantle wedge?” (2015) submitted to Geology, examines the mantle wedge beneath multiple island arcs. Magnetic anomalies in island arc settings have been attributed to a serpentinized mantle wedge. While this material is not available to test, metasomatized mantle, common to the mantle wedge, is available. Metasomatized mantle is mostly paramagnetic, and thus supports that stepwise dehydration of a subducting slab may produce positive and negative anomalies in the mantle wedge. As first author I prepared samples, ran experiments, processed data, produced figures, wrote the manuscript and applied for funding.
Download or read book Paleomagnetic Analysis of Miocene Basalt Flows in the Tehachapi Mountains California written by Jeffrey B. Plescia and published by . This book was released on 1994 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: New paleomagnetic directions and 40AR/39AR extrusion ages from Miocene basalt flows on the north flank of the Tehachapi Mountains, southern California.
