Results 1 to 10 of about 3,400 (188)

Kilometer-scale structure on the core–mantle boundary near Hawaii [PDF]

Nature Communications, 2022
A new paper constrains a high-resolution ultra-low velocity zone (ULVZ) structure at the base of the Hawaiian mantle. The authors further propose this to be a chemically distinct ULVZ with increasing iron content towards the core mantle boundary.
Zhi Li, Kuangdai Leng, Jennifer Jenkins, Sanne Cottaar   +3 more
doaj   +2 more sources

Geomagnetic spikes on the core-mantle boundary [PDF]

Nature Communications, 2017
Rapid and spatially localized geomagnetic field variations around 1000 BC are hard to reconcile with expected field behaviour arising from the core dynamo.
Christopher Davies, Catherine Constable
doaj   +2 more sources

A diamond-bearing core-mantle boundary on Mercury [PDF]

Nature Communications
Abundant carbon was identified on Mercury by MESSENGER, which is interpreted as the remnant of a primordial graphite flotation crust, suggesting that the magma ocean and core were saturated in carbon.
Yongjiang Xu, Yanhao Lin, Peiyan Wu, Olivier Namur, Yishen Zhang, Bernard Charlier   +5 more
doaj   +2 more sources

Extensive iron–water exchange at Earth’s core–mantle boundary can explain seismic anomalies [PDF]

Nature Communications
Seismological observations indicate the presence of chemical heterogeneities at the lowermost mantle, just above the core–mantle boundary (CMB), sparking debate over their origins.
Katsutoshi Kawano, Masayuki Nishi, Hideharu Kuwahara, Sho Kakizawa, Toru Inoue, Tadashi Kondo   +5 more
doaj   +2 more sources

Reactive formation of magnesiowüstite at the lunar core-mantle boundary [PDF]

Nature Communications
Seismological and geodetic data indicate that the lunar core-mantle boundary (CMB) exhibits a well-defined low-velocity zone (LVZ) with a combination of anomalous seismic velocities and density that remain unexplained.
Qianzhi Xu, Shuchang Gao, Wim van Westrenen, Steeve Gréaux, Yoshio Kono, Peiyan Wu, Yongjiang Xu, Sheng Shang, Hua Xiang, Sho Kakizawa, Noriyoshi Tsujino, Yuji Higo, Yanhao Lin   +12 more
doaj   +2 more sources

The emerging picture of a complex core-mantle boundary [PDF]

Nature Communications
Recent seismological studies challenge the traditional view that the interface between the core and mantle is a straightforward discontinuity. As seismology is pushed to its observational limits, a complex - potentially compositionally layered - region ...
Stuart Russell, Jessica C. E. Irving, Robert Myhill, Sanne Cottaar   +3 more
doaj   +2 more sources

Deep mantle anomalies block early Earth melting, challenging a primordial origin [PDF]

Scientific Reports
Earth’s deep mantle hosts enigmatic structures known as Large Low Velocity Provinces (LLVPs), which sit atop the core–mantle boundary and influence mantle dynamics and plume generation.
Arnab Roy, Eric Mittelstaedt, C. M. Cooper   +2 more
doaj   +2 more sources

Multidisciplinary Constraints on the Thermal‐Chemical Boundary Between Earth's Core and Mantle

Geochemistry, Geophysics, Geosystems, 2022
Heat flux from the core to the mantle provides driving energy for mantle convection thus powering plate tectonics, and contributes a significant fraction of the geothermal heat budget.
Daniel A. Frost, Margaret S. Avery, Bruce A. Buffett, Bethany A. Chidester, Jie Deng, Susannah M. Dorfman, Zhi Li, Lijun Liu, Mingda Lv, Joshua F. Martin   +9 more
doaj   +1 more source

Review of Electrical Resistivity Measurements and Calculations of Fe and Fe-Alloys Relating to Planetary Cores

Frontiers in Earth Science, 2021
There is a considerable amount of literature on the electrical resistivity of iron at Earth’s core conditions, while only few studies have considered iron and iron-alloys at other planetary core conditions.
Meryem Berrada, Richard A. Secco
doaj   +1 more source

Mantle Electrical Conductivity and the Magnetic Field at the Core–Mantle Boundary

Fluids, 2021
The Earth’s magnetic field is measured on and above the crust, while the turbulent dynamo in the outer core produces magnetic field values at the core–mantle boundary (CMB).
John V. Shebalin
doaj   +1 more source