scholarly journals Paleomagnetic Recording Efficiency of Sedimentary Magnetic Mineral Inclusions: Implications for Relative Paleointensity Determinations

2019 ◽  
Vol 124 (7) ◽  
pp. 6267-6279 ◽  
Author(s):  
Hoabin Hong ◽  
Liao Chang ◽  
Akira Hayashida ◽  
Andrew P. Roberts ◽  
David Heslop ◽  
...  
Keyword(s):  
Magnetic Mineral ◽  
Mineral Inclusions ◽  
Recording Efficiency ◽  
Relative Paleointensity

Detrital remanent magnetization of single-crystal silicates with magnetic inclusions: constraints from deposition experiments

2020 ◽  
Vol 224 (3) ◽  
pp. 2001-2015
Author(s):  
Liao Chang ◽  
Hoabin Hong ◽  
Fan Bai ◽  
Shishun Wang ◽  
Zhaowen Pei ◽  
...  
Keyword(s):  
Field Dependence ◽  
Remanent Magnetization ◽  
Magnetic Moments ◽  
Magnetic Mineral ◽  
Simple Explanation ◽  
Rolling Ball ◽  
Mineral Inclusions ◽  
Recording Efficiency ◽  
Inclination Shallowing ◽  
Linear Field

SUMMARY Quasi-linear field-dependence of remanence provides the foundation for sedimentary relative palaeointensity studies that have been widely used to understand past geomagnetic field behaviour and to date sedimentary sequences. Flocculation models are often called upon to explain this field dependence and the lower palaeomagnetic recording efficiency of sediments. Several recent studies have demonstrated that magnetic-mineral inclusions embedded within larger non-magnetic host silicates are abundant in sedimentary records, and that they can potentially provide another simple explanation for the quasi-linear field dependence. In order to understand how magnetic inclusion-rich detrital particles acquire sedimentary remanence, we carried out depositional remanent magnetization (DRM) experiments on controlled magnetic inclusion-bearing silicate particles (10–50 μm in size) prepared from gabbro and mid-ocean ridge basalt samples. Deposition experiments confirm that the studied large silicate host particles with magnetic mineral inclusions can acquire a DRM with accurate recording of declination. We observe a silicate size-dependent inclination shallowing, whereby larger silicate grains exhibit less inclination shallowing. The studied sized silicate samples do not have distinct populations of spherical or platy particles, so the observed size-dependence inclination shallowing could be explained by a ‘rolling ball’ model whereby larger silicate particles rotate less after depositional settling. We also observe non-linear field-dependent DRM acquisition in Earth-like magnetic fields with DRM behaviour depending strongly on silicate particle size, which could be explained by variable magnetic moments and silicate sizes. Our results provide direct evidence for a potentially widespread mechanism that could contribute to the observed variable recording efficiency and inclination shallowing of sedimentary remanences.

scholarly journals Widespread occurrence of silicate-hosted magnetic mineral inclusions in marine sediments and their contribution to paleomagnetic recording

2016 ◽  
Vol 121 (12) ◽  
pp. 8415-8431 ◽  
Author(s):  
Liao Chang ◽  
Andrew P. Roberts ◽  
David Heslop ◽  
Akira Hayashida ◽  
Jinhua Li ◽  
...  
Keyword(s):  
Marine Sediments ◽  
Magnetic Mineral ◽  
Widespread Occurrence ◽  
Mineral Inclusions

MINERAL INCLUSIONS IN ZIRCONS FROM UHP ECLOGITE AND HP GRANULITE AND CONSTRAINTS ON THE P-T CONDITIONS OF ZIRCON GROWTH, NORTH QAIDAM TERRANE, CHINA

2017 ◽  
Author(s):  
Katie Stubbs ◽  
◽  
Miranda R. Lehman ◽  
Vaughan Michael Gilmore ◽  
David Hernandez-Uribe ◽  
...  
Keyword(s):  
Mineral Inclusions ◽  
Zircon Growth ◽  
North Qaidam

LONGEVITY OF DUCTILE SHEAR ZONES FROM DIFFUSION GEOSPEEDOMETRY OF KINEMATICALLY-SENSITIVE MINERAL INCLUSIONS

2019 ◽  
Author(s):  
William O. Nachlas ◽  
◽  
Christian Teyssier ◽  
Donna L. Whitney ◽  
Greg Hirth
Keyword(s):  
Shear Zones ◽  
Mineral Inclusions ◽  
Ductile Shear Zones ◽  
Ductile Shear
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