Browsing NTNU Open by Author "Church, Nathan Stewart"
Now showing items 1-11 of 11
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3D Joint Inversion of Scanning Magnetic Microscopy Data
Pastore, Zeudia; Lelievre, P; McEnroe, Suzanne; Church, Nathan Stewart (Journal article; Peer reviewed, 2021)Scanning magnetic microscopy (SMM) is a modern magnetometry technique that maps the magnetic anomalies resulting from small-scale variations of remanent magnetization within a sample. This information is vital to understand ... -
Magnetic Mineralogy and Petrophysical Properties of Ultramafic Rocks: Consequences for Crustal Magnetism
ter Maat, Geertje; McEnroe, Suzanne; Church, Nathan Stewart; B. Larsen, Rune (Journal article; Peer reviewed, 2019)Magnetic properties from the Reinfjord Ultramafic Complex, in northern Norway, which formed as part of a deep magmatic conduit system, have been investigated to determine the magnetic signature of ultramafic rocks now ... -
Magnetism at Depth: A View from an Ancient Continental Subduction and Collision Zone
McEnroe, Suzanne; Robinson, Peter; Church, Nathan Stewart; Purucker, Micheal (Journal article; Peer reviewed, 2018)Recent sophisticated global data compilations and magnetic surveys have been used to investigate the nature of magnetization in the lower crust and upper mantle. Two approaches to constraining magnetizations are developed, ... -
Mapping and modelling mineral sources of natural remanent magnetization from the Russell Belt microcline-sillimanite gneiss, Northwest Adirondack Mountains, USA
Pastore, Zeudia; McEnroe, Suzanne; Church, Nathan Stewart; Oda, Hirokuni (Peer reviewed; Journal article, 2021)Distinct crustal remanent magnetic anomalies are a strong indicator of rocks with stable natural remanent magnetization (NRM) carriers. The latter are able to store information on the history of a rock over long geological ... -
Mapping magnetic sources at the millimeter to micrometer scale in dunite and serpentinite by high-resolution magnetic microscopy
Pastore, Zeudia; McEnroe, Suzanne; ter Maat, Geertje; Oda, Hirokuni; Church, Nathan Stewart; Fumagalli, Patrizia (Journal article; Peer reviewed, 2018)Rock samples can have wide range of magnetic properties depending on composition, amount of ferromagnetic minerals, grain sizes and microstructures. Here, we used scanning magnetic microscopy, a highly sensitive and ... -
Microscale Magnetic Inversion of Remanent Magnetization Mineral Sources From the Black Hill Norite, South Australia
Lee, Madeline; Mcenroe, Suzanne Amy; Pastore, Zeudia; Church, Nathan Stewart; Schmidt, Phillip (Peer reviewed; Journal article, 2023)Inverse modeling of regional-scale aeromagnetic data is complicated due to the non-uniqueness principle and interference of anomalies, especially with increased source-sensor separation. This is why in situ data and ... -
Multistep Parametric Inversion of Scanning Magnetic Microscopy Data for Modeling Magnetization of Multidomain Magnetite
Pastore, Zeudia; Church, Nathan Stewart; McEnroe, Suzanne (Peer reviewed; Journal article, 2019)Development in instrumentation and technology now allows for mapping of magnetic anomalies, caused by spatial variations in magnetization in the source material, from the mineral to the crustal anomalies scale. High-resolution ... -
Nonlinear Preisach maps: Detecting and characterizing separate remanent magnetic fractions in complex natural samples
Church, Nathan Stewart; Fabian, Karl; McEnroe, Suzanne (Peer reviewed; Journal article, 2016)Natural remanent magnetization carriers in rocks can contain mixtures of magnetic minerals that interact in complex ways and are challenging to characterize by current measurement techniques. Here a nonlinear mapping scheme ... -
Portrait of a giant deep-seated magmatic conduit system: The Seiland Igneous Province
B. Larsen, Rune; Grant, Thomas; Sørensen, Bjørn Eske; Tegner, Christian; McEnroe, Suzanne; Pastore, Zeudia; Fichler, Christine; Nikolaisen, Even; Grannes, Kim Rune Bragstad; Church, Nathan Stewart; ter Maat, Geertje; Michels, Alexander (Journal article; Peer reviewed, 2018)The Seiland Igneous Province (SIP), Northern Norway, contains > 5000 km2 of mafic and ultramafic intrusions with minor alkaline, carbonatite and felsic rocks that were intruded into the lower continental crust at a depth ... -
Separating geometry- from stress-induced remanent magnetization in magnetite with ilmenite lamellae from the Stardalur basalts, Iceland
ter Maat, Geertruida Wilhelmina; Fabian, Karl; Church, Nathan Stewart; McEnroe, Suzanne (Peer reviewed; Journal article, 2020)Realistic geometries of magnetite grains from the Stardalur volcano, Iceland, were obtained by Focused Ion Beam Scanning Electron Microscopy nanotomography. These magnetite grains are subdivided by oxidation‐exsolution ... -
The contribution of maficultramafic mineral sources to magnetic anomalies
ter Maat, Geertruida Wilhelmina (Doctoral theses at NTNU;2019:210, Doctoral thesis, 2019)The interpretation of magnetic anomalies at all scales relies on the understanding of the petrophysical and rock magnetic properties. The stability of magnetic minerals in the crust depends on the composition and ...