Results 51 to 60 of about 406 (161)

Thermochemical Controls on the X, 410, and 660 Discontinuities in the Central Mediterranean

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 8, August 2026.
Abstract The mantle beneath the Central Mediterranean is thermally and compositionally heterogeneous, as indicated by fragmented and locally stagnant slabs in tomographic images and HIMU‐like anorogenic magmatism. Mantle discontinuities are sensitive to both temperature and composition, and thus provide a way to quantify these heterogeneities.
Luciana Bonatto, Stephen Monna, Caterina Montuori, Claudia Piromallo, Vernon Cormier   +4 more
wiley   +1 more source

Effect of Fluorine on the Stability of Dense Hydrous Mg Silicates With Implications for the Deep Water Cycle

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 8, August 2026.
Abstract Water is believed to be transported, at least locally, into the Earth's deep mantle via hydrous minerals. Fluorine not only tends to interact with water but also influences the stability of hydrous minerals. Thus, knowledge of its stability could be important in understanding the deep‐water cycle.
Takashi Yoshino, Yunfan Miao, Satheesh T. Saji, Daijo Ikuta, Nozomi Kondo, Takayuki Ishii, Xuejing He, Tsutomu Ota, Takuya Kunihiro   +8 more
wiley   +1 more source

Water partitioning between bridgmanite and postperovskite in the lowermost mantle [PDF]

Earth and Planetary Science Letters, 2016
Abstract The lowermost mantle appears to contain geochemically primitive reservoirs of volatile components including water, as evidenced by certain ocean island basalts ( Hallis et al., 2015 ). We used ab initio lattice dynamics to calculate the water partition coefficient between bridgmanite and postperovskite using quasi-harmonic free energies to ...
Joshua P. Townsend, Jun Tsuchiya, Craig R. Bina, Steven D. Jacobsen   +3 more
openaire   +1 more source

Oxygen Vacancy Ordering in Aluminous Bridgmanite in the Earth's Lower Mantle

Geophysical Research Letters, 2019
Oxygen vacancies (OVs), that charge‐balance the replacement of octahedrally coordinated Si4+ by Al3+ in the mineral bridgmanite, will influence transport properties in the lower mantle but little is known about their stability and local structure.
Helen Grüninger, Zhaodong Liu, Renée Siegel, Tiziana Boffa Ballaran, Tomoo Katsura, Jürgen Senker, Daniel J. Frost   +6 more
doaj   +1 more source

Formation of bridgmanite-enriched layer at the top lower-mantle during magma ocean solidification

Nature Communications, 2020
Following the impact of the protoplanet Theia, planet Earth likely transformed into a magma ocean. New high temperature and pressure experiments by Xie et al.
Longjian Xie, Akira Yoneda, Daisuke Yamazaki, Geeth Manthilake, Yuji Higo, Yoshinori Tange, Nicolas Guignot, Andrew King, Mario Scheel, Denis Andrault   +9 more
doaj   +1 more source

Massive Rocky Planets May Suppress Deep Melting

AGU Advances, Volume 7, Issue 4, August 2026.
Abstract Melting properties of silicates are critical to understanding the thermal evolution of rocky planetary interiors. In the deep mantles of massive rocky planets, post‐post‐spinel Mg2SiO4 ${\text{Mg}}_{2}{\text{SiO}}_{4}$ is potentially one of the most abundant mineral phases, yet its melting behavior remains unconstrained. Here, we determine the
Donghao Zheng, Yihang Peng, Jie Deng
wiley   +1 more source

Effect of Fe2+ on Akimotoite to Bridgmanite Transition: Its Implication on Subduction Dynamics

Geochemistry, Geophysics, Geosystems
Seismic studies in cold subduction zones indicate several discontinuity structures near the 660‐km boundary. Studies indicate that the akimotoite to bridgmanite transition may play a significant role in unraveling the complexity of this region.
Priyanka Pandit, Prathibha Chandrashekhar, Sparsh Sharma, Gaurav Shukla   +3 more
doaj   +1 more source

Spin Transition of Ferric Iron in Silicate Glasses Inferred by High‐Pressure Electrical Conductivity Measurements

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 8, August 2026.
Abstract Silicate melt has been proposed to exist near the base of the mantle and has been invoked to explain seismic and electrical conductivity anomalies observed near the core‐mantle boundary; however, its presence and stability under lowermost‐mantle conditions remain uncertain.
Izumi Mashino, Takashi Yoshino, Shinji Kitao, Takaya Mitsui, Ryo Masuda, Makoto Seto   +5 more
wiley   +1 more source

Structural Evolution of Antigorite by High‐Velocity Impacts

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 8, August 2026.
Abstract Serpentine is a major hydrous mineral present in hydrous asteroids that have evolved through planetary impacts. Understanding its dynamic behavior is essential to elucidate the redistribution and retention of water during high‐velocity impact processes. The shock response of antigorite was examined at pressures up to 106 GPa using laser‐driven
Yuhei Umeda, Yusuke Seto, Naotaka Tomioka, Hiroshi Arima‐Osonoi, Yoichiro Hironaka, Yuichi Inubushi, Kento Katagiri, Ryosuke Kodama, Kohei Miyanishi, Hirotaka Nakamura, Norimasa Ozaki, Tomoko Sato, Keiichi Sueda, Tadashi Togashi, Toshinori Yabuuchi, Makina Yabashi, Toshimori Sekine, Takuo Okuchi   +17 more
wiley   +1 more source

A Library of Elastic Tensors for Lowermost Mantle Seismic Anisotropy Studies and Comparison With Seismic Observations

Geochemistry, Geophysics, Geosystems, 2020
The exact mechanism for lowermost mantle seismic anisotropy remains unknown; however, work on the elasticity and deformation of lower mantle materials has constrained a few possible options. The most probable minerals producing anisotropy are bridgmanite,
Neala Creasy, Lowell Miyagi, Maureen D. Long   +2 more
doaj   +1 more source