Roger Fu

Harvard University Press

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B. P. Weiss

Massachusetts Institute of Technology

Eduardo A. Lima

Massachusetts Institute of Technology

R. J. Harrison

University of Cambridge

Michael Volk

Planetary Science Institute

Raisa Trubko

Worcester Polytechnic Institute

Cauê S. Borlina

Massachusetts Institute of Technology

C. Suavet

Stockholm Environment Institute

Alec R. Brenner

Planetary Science Institute

Ricardo I.F. Trindade

Universidade de São Paulo

Fengzai Tang

University of Warwick

Cooperative Institutions

Planetary Science Institute

Massachusetts Institute of Technology

Harvard University

University of Cambridge

Harvard University Press

California Institute of Technology

Centre National de la Recherche Scientifique

Universidade de São Paulo

Center for Astrophysics Harvard & Smithsonian

Chinese Academy of Sciences

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Constraining Nebular Magnetic Fields in the Outer Solar System from CO Chondrites

LPI (2019)

Cauê S. Borlina B. P. Weiss J. F. J. Bryson Roger Fu Eduardo A. Lima

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Paleomagnetism of Portuguese stalagmites: advances and perspectives

Eric Font Elisa M. Sánchez‐Moreno Fco. Javier Pavón–Carrasco Luca António Dimuccio Claude Hillaire‐Marcel

<p>Speleothems are secondary mineral deposits formed in caves and may represent excellent recorders of variations of the Earth&#8217;s magnetic field. Magnetic studies of speleothems provide two important forms of data: i) continuous and high-resolution records of short-term variations of the geomagnetic field (GMF), and conversely the use of paleomagnetism as a dating tool of speleothems; and ii) high-resolution records of climate variability by linking rock magnetic properties to climate and environmental forcing parameters acting on soils. However, the use of speleothem magnetism as a dating tool and paleo-climate archive still requires a great deal of maturation before being comparable to traditional techniques. Here we present a review of the paleomagnetic records of speleothems from Portugal obtained during the last five years and propose a new approach to date speleothem based on paleomagnetic data. We also present preliminary results and future investigations in the framework of an ongoing research project (Speleothems as magnetic, environmental and paleo-fire archives; ref. PTDC/CTA-GEO/0125/2021) and a bilateral exploratory MIT-FCT project (Analyzing environmental and climate records in Portuguese speleothems using ultra-high sensitivity magnetic microscopy; ref. MIT-EXPL/ACC/0023/2021) both funded by the Foundation of Sciences and Technology (FCT) of Portugal.</p>

Speleothem

Stalagmite

Environmental Magnetism

Rock magnetism

10.5194/egusphere-egu22-13036

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Pinpointing the Mechanism of Magnetic Enhancement in Modern Soils Using High‐Resolution Magnetic Field Imaging

Geochemistry Geophysics Geosystems (2023)

Roger Fu Barbara A. Maher Junsheng Nie Peng Gao Thomas Berndt

Abstract In well‐buffered modern soils, higher annual rainfall is associated with enhanced soil ferrimagnetic mineral content, especially of ultrafine particles that result in distinctive rock magnetic properties. Hence, paleosol magnetism has been widely used as a paleoprecipitation proxy. Identifying the dominant mechanism(s) of magnetic enhancement in a given sample is critical for reliable inference of paleoprecipitation. Here, we use high‐resolution magnetic field and electron microscopy to identify the grain‐scale setting and formation pathway of magnetic enhancement in two modern soils developed in higher (∼580 mm/y) and lower (∼190 mm/y) precipitation settings from the Qilianshan Range, China. We found that both soils contain 1–30 μm aeolian Fe‐oxide grains with indistinguishable rock magnetic properties, while the higher‐precipitation soil contains an additional population of ultrafine (<150 nm) magnetically distinct magnetite grains. We show that the in situ precipitation of these ultrafine particles, likely during wet‐dry cycling, is the only significant magnetic enhancement mechanism in this soil. These results demonstrate the potential of quantum diamond microscope magnetic microscopy to extract magnetic information from distinct, even intimately mixed, grain populations. This information can be used to evaluate the contribution of distinct enhancement mechanisms to the total magnetization.

Rock magnetism

Superparamagnetism

Ferrimagnetism

Environmental Magnetism

10.1029/2022gc010812

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Citations (2)

Scanning 3-Axis Magnetometry can Detect Ancient Martian Lightning Strikes: Field Trials on a Native America Petroglyph

Lunar and Planetary Science Conference (2014)

Joseph L. Kirschvink Roger Fu Gaurav Gupta M. Grappone Ross N. Mitchell

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First Images Of Magnetite In Jack Hills Zircon - Are They Primary Inclusions?

AGU Fall Meeting Abstracts (2018)

Richard Taylor R. J. Harrison Fengzai Tang Cauê S. Borlina B. P. Weiss

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Paleomagnetic Field Intensity and Magnetic Field Recording Characteristics of Apollo 15 Glasses

Lunar and Planetary Science Conference (2019)

K. A. Hess Roger Fu N. E. B. Zellner Sonia M. Tikoo-Schantz

Archaeomagnetic dating

Intensity

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Magnetic Fields in the Late-Stage Solar Nebula Recorded in CR Chondrites

LPI (2015)

Roger Fu B. P. Weiss D. L. Schrader

Chondrule

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Records of Magnetic Fields in the Chondrule Formation Environment

Cambridge University Press eBooks (2018)

Roger Fu B. P. Weiss D. L. Schrader Brandon Johnson

Chondrules contain ferromagnetic minerals that may retain a record of the magnetic field environments in which they cooled. Paleomagnetic experiments on separated chondrules can potentially reveal the presence of remanent magnetization from the time of chondrule formation. The existence of such a magnetization places quantitative bounds on the frequency of interchondrule collisions, while the intensity of magnetization may be used to infer the strength of nebular magnetic fields and thereby constrain the mechanism of chondrule formation. Recent advances in laboratory instrumentation and techniques have permitted the isolation of nebular remanent magnetization in chondrules, providing the potential basis to probe the formation environments of chondrules from a range of chondrite classes.

Chondrule

Natural remanent magnetization

10.1017/9781108284073.012

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Harvard Dataverse (2020)

Roger Fu

:unav

10.7910/dvn/hnjgqw/f5ic6y

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