Crustal Magnetism

Purucker, Michael E.

doi:10.1016/b978-0-444-53802-4.00100-7

Cited by 15 publications

(11 citation statements)

References 305 publications

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“…This information is critical to the study of the past history of the Earth’s magnetic field and is also a key tool to interpret magnetic anomalies on Earth and other rocky planetary bodies. The mineral sources and nature of remanent magnetization reflected in crustal magnetic anomalies are ongoing topics of research (Brown & McEnroe, 2008; Clark, 1999; Ferré et al., 2021; McEnroe et al., 2002, 2018; McEnroe, Brown, et al., 2009; McEnroe, Fabian, et al., 2009; McEnroe, Robinson, et al., 2001; Michels et al., 2018, 2020; Purucker & Whaler, 2007; ter Maat et al., 2019, 2020).…”

Section: Introductionmentioning

confidence: 99%

Mapping and Modeling Sources of Natural Remanent Magnetization in the Microcline–Sillimanite Gneiss, Northwest Adirondack Mountains: Implications for Crustal Magnetism

Pastore

McEnroe

Church

et al. 2021

Geochem Geophys Geosyst

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• Magnetic measurements and microscopic observation indicate exsolved titanohematite is the main source of natural remanent magnetization • Data inversions confirm magnetic enhancement from microstructure in titanohematite and weak contribution of multidomain hematite to the NRM • Inversion results are consistent with bulk measurements, and indicate little effect of alternating field demagnetization on the NRM Accepted Article This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

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Section: Introductionmentioning

confidence: 99%

Mapping and Modeling Sources of Natural Remanent Magnetization in the Microcline–Sillimanite Gneiss, Northwest Adirondack Mountains: Implications for Crustal Magnetism

Pastore

McEnroe

Church

et al. 2021

Geochem Geophys Geosyst

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“…These disturbances in magnetic field are attributed to differences in the nature of the rocks composing the basement (Turner, Rasson & Reeves, 2007). We do not attempt to identify the exact nature of these rocks here; rather, we use these contrasted anomalies to characterize differences of rock types that compose the basement (Purucker & Whaler, 2007; Lund et al 2015). As on the Bouguer gravity anomaly map, the presence of the Snake River Plane hotspot-track (SRP in Fig.…”

Section: Resultsmentioning

confidence: 99%

Controlling factors for differential subsidence in the Sonoma Foreland Basin (Early Triassic, western USA)

et al. 2017

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Sediments deposited from the Permian–Triassic boundary (~252 Ma) until the end-Smithian (Early Triassic;c.250.7 Ma) in the Sonoma Foreland Basin show marked thickness variations between its southern (up toc.250 m thick) and northern (up toc.550 m thick) parts. This basin formed as a flexural response to the emplacement of the Golconda Allochthon during the Sonoma orogeny. Using a high-resolution backstripping approach, a numerical model and sediment thickness to obtain a quantitative subsidence analysis, we discuss the controlling factor(s) responsible for spatial variations in thickness. We show that sedimentary overload is not sufficient to explain the significant discrepancy observed in the sedimentary record of the basin. We argue that the inherited rheological properties of the basement terranes and spatial heterogeneity of the allochthon are of paramount importance in controlling the subsidence and thickness spatial distribution across the Sonoma Foreland Basin.

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“…Long-wavelength anomalies originate largely within the lithosphere (Purucker & Whaler, 2015;Purucker & Clark, 2011). Here the thickness of the magnetic crust, the part of the lithosphere above the Curie temperature of ferromagnetic minerals, plays an important role.…”

Section: Potential Contribution To Crustal Magnetismmentioning

confidence: 99%

“…Shallower features, which could explain observed LWAs, have not been identified. The search for deeper sources has been a subject of study over the past four decades (Purucker & Whaler, 2015). A number of questions remain unresolved concerning the source of deep magnetization that could account for LWAs: Are there primary magnetic minerals in the deep lithosphere?…”

Section: Introductionmentioning

confidence: 99%

Magnetic Mineralogy and Petrophysical Properties of Ultramafic Rocks: Consequences for Crustal Magnetism

Maat

McEnroe

Church

et al. 2019

Geochem Geophys Geosyst

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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 exposed at the surface and deeper in the lower crust. The dominant carriers in these ultramafic rocks are a chrome‐spinel with Fe‐rich exsolution blebs and exsolution lamellae of magnetite in clinopyroxene. Except locally, in a fault zone and in discrete small fractures, these rocks show only minor to no alteration. We infer that the magnetic oxides characterized here are representative of pristine magnetic carriers in similar rocks deeper in the crust. These oxides can be stable in lower crustal, possibly upper mantle, depths when temperatures are below the Curie temperature of magnetite, taking into account pressure effects. These ultramafic rocks are candidates for potential sources of long‐wavelength anomalies.

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Crustal Magnetism

Cited by 15 publications

References 305 publications

Mapping and Modeling Sources of Natural Remanent Magnetization in the Microcline–Sillimanite Gneiss, Northwest Adirondack Mountains: Implications for Crustal Magnetism

Mapping and Modeling Sources of Natural Remanent Magnetization in the Microcline–Sillimanite Gneiss, Northwest Adirondack Mountains: Implications for Crustal Magnetism

Controlling factors for differential subsidence in the Sonoma Foreland Basin (Early Triassic, western USA)

Magnetic Mineralogy and Petrophysical Properties of Ultramafic Rocks: Consequences for Crustal Magnetism

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