Stability of a hydrous δ-phase, AlOOH–MgSiO2 (OH) 2, and a mechanism for water transport into the base of lower mantle

I Ohira, E Ohtani, T Sakai, M Miyahara, N Hirao… - Earth and Planetary …, 2014 - Elsevier
The global water cycle in the Earth is one of the most important issues in geodynamics,
because water can affect the physical and rheological properties of the mantle. However, it …

Development of high-pressure multigrain X-ray diffraction for exploring the Earth's interior

L Zhang, H Yuan, Y Meng, HK Mao - Engineering, 2019 - Elsevier
The lower mantle makes up more than a half of our planet's volume. Mineralogical and
petrological experiments on realistic bulk compositions under high pressure–temperature (P …

Natural dissociation of olivine to (Mg,Fe)SiO3 perovskite and magnesiowüstite in a shocked Martian meteorite

M Miyahara, E Ohtani, S Ozawa… - Proceedings of the …, 2011 - National Acad Sciences
We report evidence for the natural dissociation of olivine in a shergottite at high-pressure
and high-temperature conditions induced by a dynamic event on Mars. Olivine (Fa34-41) …

Evidence for fractional crystallization of wadsleyite and ringwoodite from olivine melts in chondrules entrained in shock-melt veins

M Miyahara, A El Goresy, E Ohtani… - Proceedings of the …, 2008 - National Acad Sciences
Peace River is one of the few shocked members of the L-chondrites clan that contains both
high-pressure polymorphs of olivine, ringwoodite and wadsleyite, in diverse textures and …

Coherent and subsequent incoherent ringwoodite growth in olivine of shocked L6 chondrites

M Miyahara, E Ohtani, M Kimura, A El Goresy… - Earth and Planetary …, 2010 - Elsevier
Pervasive replacement of original olivine grains by ringwoodite adjacent to a shock-melt
vein of Yamato 791384L6 chondrite was observed with a FEG-SEM. In these olivines, we …

Estimating compositions of natural ringwoodite in the heavily shocked Grove Mountains 052049 meteorite from Raman spectra

L Feng, Y Lin, S Hu, L Xu… - American …, 2011 - pubs.geoscienceworld.org
A combined Raman spectroscopy and electron probe microanalysis study of the heavily
shocked Grove Mountains (GRV) 052049 meteorite revealed the largest chemical …

Fe-Mg partitioning between perovskite and ferropericlase in the lower mantle

T Sakai, E Ohtani, H Terasaki… - American …, 2009 - pubs.geoscienceworld.org
Fe-Mg partitioning between perovskite and ferropericlase in the MgO-FeO-SiO2 system has
been studied up to about 100 GPa at around 2000 K using a laser-heated diamond anvil cell …

Jadeite formation in shocked ordinary chondrites

M Miyahara, S Ozawa, E Ohtani, M Kimura… - Earth and Planetary …, 2013 - Elsevier
Albitic feldspar in shocked ordinary chondrites (Yamato 791384 L6 and Yamato 75100 H6)
and albite recovered from static high-pressure and high-temperature synthetic experiments …

Fractional crystallization of olivine melt inclusion in shock-induced chondritic melt vein

M Miyahara, A El Goresy, E Ohtani, M Kimura… - Physics of the Earth and …, 2009 - Elsevier
The formation of ringwoodite, wadsleyite and majorite from their parental low-pressure
polymorphs in melt veins in chondritic meteorites is usually interpreted to be the result of …

Combining FIB milling and conventional Argon ion milling techniques to prepare high‐quality site‐specific TEM samples for quantitative EELS analysis of oxygen in …

N Miyajima, C Holzapfel, Y Asahara… - Journal of …, 2010 - Wiley Online Library
This paper reports a procedure to combine the focused ion beam micro‐sampling method
with conventional Ar‐milling to prepare high‐quality site‐specific transmission electron …