Geochemistry, Geophysics, Geosystems


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      Rock magnetic properties of a soil developed on an alluvial deposit at Buttermilk Creek, Texas, USA

      Anna K. Lindquist, Joshua M. Feinberg and Michael R. Waters

      Article first published online: 28 DEC 2011 | DOI: 10.1029/2011GC003848

      Key Points

      • Alluvial soils produce interpretable magnetic signals
      • The soil and artifacts at the Friedkin site are in stratigraphic order
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      Mineral magnetism of dusty olivine: A credible recorder of pre-accretionary remanence

      Sophie-Charlotte L. L. Lappe, Nathan S. Church, Takeshi Kasama, Alice Bastos da Silva Fanta, Geoff Bromiley, Rafal E. Dunin-Borkowski, Joshua M. Feinberg, Sara Russell and Richard J. Harrison

      Article first published online: 17 DEC 2011 | DOI: 10.1029/2011GC003811

      Key Points

      • Dusty olivine is a credible carrier of pre-accretionary remanence
      • Remanence is carried by both single-domain and single-vortex states
      • Remanence blocks immediately below Tc and remains stable for 4.6 Ga at any T
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      Rock magnetism of hematitic “bombs” from the Araguainha impact structure, Brazil

      Luigi Jovane, Elder Yokoyama, Takele Seda, Russell F. Burmester, Ricardo I. F. Trindade and Bernard A. Housen

      Article first published online: 8 DEC 2011 | DOI: 10.1029/2011GC003758

      Key Points

      • The paper is the first use of rock magnetic analysis for the hematite impact
      • We present a series of unique analysis like FORC versus temperature study hematite
      • We produce proofs that introduce a new hypothesis for formation of this material
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      A Holocene paleosecular variation record from the northwestern Barents Sea continental margin

      Leonardo Sagnotti, Patrizia Macrì, Renata Lucchi, Michele Rebesco and Angelo Camerlenghi

      Article first published online: 1 NOV 2011 | DOI: 10.1029/2011GC003810

      Key Points

      • This study allows a reconstruction of the Holocene PSV at high N latitudes
      • The data provide a high-resolution age model for paleoenvironmental studies
      • The data provide valuable experimental constraints for geomagnetic field models
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      Coupled 100-kyr cycles between 3 and 1 Ma in terrestrial and marine paleoclimatic records

      Junsheng Nie

      Article first published online: 26 OCT 2011 | DOI: 10.1029/2011GC003772

      Key Points

      • 100-kyr-band paleoclimatic records are amplitude-coupled during 3-1 Ma
      • Paleoclimate records and eccentricity are not amplitude-coupled during 3-1 Ma
      • A free 100-kyr oscillation controlled 100-kyr paleoclimatic cycles during 3-1 Ma
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      A micromagnetic investigation of magnetite grains in the form of Platonic polyhedra with surface roughness

      W. Williams, A. R. Muxworthy and M. E. Evans

      Article first published online: 15 OCT 2011 | DOI: 10.1029/2011GC003560

      Key Points

      • Irregular grain surface morphologies for SD do not enhance coercivity
      • PSD grains can double their coercivity by the addition of grain surface bumps
      • Very high coercivities can only be explained by grain shape anisotropy
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      Magnetic analyses of soils from the Wind River Range, Wyoming, constrain rates and pathways of magnetic enhancement for soils from semiarid climates

      Emily E. Quinton, Dennis E. Dahms and Christoph E. Geiss

      Article first published online: 17 SEP 2011 | DOI: 10.1029/2011GC003728

      Key Points

      • Magnetic enhancement in semiarid soils occurs over timescales of 100,000 years
      • Pedogenic maghemite appears an intermediate phase in the enhancement process
      • HIRM is a valid tool for the quantification of hematite even if L-ratio varies
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      Magnetic properties of ilmenite-hematite single crystals from the Ecstall pluton near Prince Rupert, British Columbia

      Sarah J. Brownlee, Joshua M. Feinberg, Takeshi Kasama, Richard J. Harrison, Gary R. Scott and Paul R. Renne

      Article first published online: 10 SEP 2011 | DOI: 10.1029/2011GC003622

      Key Points

      • Single crystal magnetic properties affected by reheating in the Ecstall pluton
      • Evidence for magnetite growth in reheated single crystals of ilmenite-hematite
      • Paleomagnetic directions from eastern Ecstall pluton were reset during reheating
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      Absolute calibration of low- and high-field magnetic susceptibilities using rare earth oxides

      Koji Fukuma and Masayuki Torii

      Article first published online: 30 AUG 2011 | DOI: 10.1029/2011GC003694

      Key Points

      • To establish a calibration method of magnetic susceptibility measurement
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      Low-temperature domain wall pinning in titanomagnetite: Quantitative modeling of multidomain first-order reversal curve diagrams and AC susceptibility

      Nathan Church, Joshua M. Feinberg and Richard Harrison

      Article first published online: 28 JUL 2011 | DOI: 10.1029/2011GC003538

      Key Points

      • Identifies a discontinuous transition domain wall pinning at low temperature
      • First identification of temperature-driven domain wall resonance
      • Robust physical interpretation of the low-T properties of titanomagnetite
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      Magnetic properties in an ash flow tuff with continuous grain size variation: A natural reference for magnetic particle granulometry

      J. L. Till, M. J. Jackson, J. G. Rosenbaum and P. Solheid

      Article first published online: 2 JUL 2011 | DOI: 10.1029/2011GC003648

      Key Points

      • Magnetic grain size changes progressively as a function of stratigraphic height
      • Magnetic domain transitions are clearly delineated by magnetic properties
      • Sample horizons have distinct grain-size-dependent magnetic signatures
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      Magnetic and geochemical characterization of iron pollution in subway dusts in Shanghai, China

      Weiguo Zhang, Huimin Jiang, Chenyin Dong, Qun Yan, Lizhong Yu and Yang Yu

      Article first published online: 22 JUN 2011 | DOI: 10.1029/2011GC003524

      Key Points

      • Subway dust in Shanghai is magnetically strong due to rail fricition
      • Subway dusts also contain industrial magnetic particles
      • Magentism of subway dust can indicate iron pollution
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      Diagenetic sensitivity of paleoenvironmental proxies: A rock magnetic study of Australian continental margin sediments

      Alexandra Abrajevitch and Kazuto Kodama

      Article first published online: 3 MAY 2011 | DOI: 10.1029/2010GC003481

      Key Points

      • Sea level variations control diagenetic alteration of detrital magnetic minerals
      • Single-domain magnetite is authigenic
      • Stability towards dissolution varies as hematite > magnetite > goethite
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      Development of a low-temperature insert for the measurement of remanent magnetization direction using superconducting quantum interference device rock magnetometers

      Aleksey V. Smirnov and John A. Tarduno

      Article first published online: 21 APR 2011 | DOI: 10.1029/2011GC003517

      Key Points

      • A new device for full magnetization vector measurements at low temperatures
      • Novel data on the magnetization vector behavior during low-temperature cycling
      • The results show a great potential of directional low-temperature magnetometry
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      Magnetostratigraphy of the Apalós Formation (early Pleistocene): Evidence for pulsed uplift of Cyprus

      Josef Weber, Wolfgang Schirmer, Friedrich Heller and Valerian Bachtadse

      Article first published online: 19 JAN 2011 | DOI: 10.1029/2010GC003193

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      Remanence stability and magnetic fabric development in synthetic shear zones deformed at 500°C

      J. L. Till, M. J. Jackson and B. M. Moskowitz

      Article first published online: 3 DEC 2010 | DOI: 10.1029/2010GC003320

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      Millennial-scale iceberg surges after intensification of Northern Hemisphere glaciation

      Tatsuya Hayashi, Masao Ohno, Gary Acton, Yohan Guyodo, Helen F. Evans, Toshiya Kanamatsu, Fumiki Komatsu and Fumi Murakami

      Article first published online: 2 SEP 2010 | DOI: 10.1029/2010GC003132

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      Quantifying the concentration of ferrimagnetic particles in sediments using rock magnetic methods

      Ioan Lascu, Subir K. Banerjee and Thelma S. Berquó

      Article first published online: 4 AUG 2010 | DOI: 10.1029/2010GC003182

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      Deriving confidence in paleointensity estimates

      Greig A. Paterson, David Heslop and Adrian R. Muxworthy

      Article first published online: 21 JUL 2010 | DOI: 10.1029/2010GC003071

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      On the quantitative analysis and evaluation of magnetic hysteresis data

      Mike Jackson and Peter Solheid

      Article first published online: 16 APR 2010 | DOI: 10.1029/2009GC002932

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      Micromagnetics of paleomagnetically significant mineral grains with complex morphology

      W. Williams, M. E. Evans and D. Krása

      Article first published online: 12 FEB 2010 | DOI: 10.1029/2009GC002828

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      On the mechanism of formation of depositional remanent magnetization

      Valeriy Shcherbakov and Natalia Sycheva

      Article first published online: 11 FEB 2010 | DOI: 10.1029/2009GC002830

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      Detection of noninteracting single domain particles using first-order reversal curve diagrams

      Ramon Egli, Amy P. Chen, Michael Winklhofer, Kenneth P. Kodama and Chorng-Shern Horng

      Article first published online: 27 JAN 2010 | DOI: 10.1029/2009GC002916

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      Variations in geomagnetic reversal frequency during the Earth's middle age

      Vladimir Pavlov and Yves Gallet

      Article first published online: 21 JAN 2010 | DOI: 10.1029/2009GC002583

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      Magnetic susceptibility as a tool to study deformed calcite with variable impurity content

      Bjarne S. G. Almqvist, Marco Herwegh, Volkmar Schmidt, Thomas Pettke and Ann M. Hirt

      Article first published online: 19 JAN 2010 | DOI: 10.1029/2009GC002900

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      Transition to superparamagnetism in chains of magnetosome crystals

      A. J. Newell

      Article first published online: 3 NOV 2009 | DOI: 10.1029/2009GC002538

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      Evidence for a 3.45-billion-year-old magnetic remanence: Hints of an ancient geodynamo from conglomerates of South Africa

      Yoichi Usui, John A. Tarduno, Michael Watkeys, Axel Hofmann and Rory D. Cottrell

      Article first published online: 24 SEP 2009 | DOI: 10.1029/2009GC002496

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      Compositional, morphological, and hysteresis characterization of magnetic airborne particulate matter in Rome, Italy

      Leonardo Sagnotti, Jacopo Taddeucci, Aldo Winkler and Andrea Cavallo

      Article first published online: 27 AUG 2009 | DOI: 10.1029/2009GC002563

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      Magnetic particle characterization in the Seine river system: Implications for the determination of natural versus anthropogenic input

      Christine Franke, Catherine Kissel, Eric Robin, Philippe Bonté and France Lagroix

      Article first published online: 7 AUG 2009 | DOI: 10.1029/2009GC002544

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      Low-temperature magnetic properties of greigite (Fe3S4)

      Liao Chang, Andrew P. Roberts, Christopher J. Rowan, Yan Tang, Petr Pruner, Qianwang Chen and Chorng-Shern Horng

      Article first published online: 29 JAN 2009 | DOI: 10.1029/2008GC002276

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      Morin transition in hematite: Size dependence and thermal hysteresis

      Özden Özdemir, David J. Dunlop and Thelma S. Berquó

      Article first published online: 21 OCT 2008 | DOI: 10.1029/2008GC002110

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