Results 101 to 110 of about 220,882 (295)

Phase transitions in MgSiO3 post-perovskite in super-Earth mantles [PDF]

, 2017
The highest pressure form of the major Earth-forming mantle silicate is MgSiO3 post-perovskite (PPv). Understanding the fate of PPv at TPa pressures is the first step for understanding the mineralogy of super-Earths-type exoplanets, arguably the most ...
Adibekyan, Baroni, Bond, Borucki, Cai-Zhuang Wang, Christensen, Coppari, da Silva, Delfosse, Dorn, Dorn, Fortney, Gautier, Giannozzi, Gillon, Grasset, Guillot, Hatzes, Irifune, Jackson, Ji, Kai-Ming Ho, Karki, Karki, Koichiro Umemoto, Leger, Marumo, Mayor, McDonough, Mehl, Min Ji, Murakami, Murakami, Niu, Oganov, Peltier, Perdew, Quintana, Renata M. Wentzcovitch, Santos, Sasselov, Seager, Shahnas, Shunqing Wu, Sotin, Tackley, Torres, Tosi, Tsuchiya, Tsuchiya, Umemoto, Umemoto, Umemoto, Umemoto, Unterborn, Unterborn, Valencia, Vanderbilt, Wagner, Wallace, Wang, Weinstein, Weiss, Wentzcovitch, Wentzcovitch, Wright, Wu, Wu   +67 more
core   +4 more sources

Mantle Transition Zone Thickness Beneath the Middle East: Evidence for Segmented Tethyan Slabs, Delaminated Lithosphere, and Lower Mantle Upwelling

Journal of Geophysical Research: Solid Earth, 2018
We use a very large seismic data set to provide a comprehensive image of the mantle transition zone (MTZ) beneath the Middle East. We utilized the technique of Common Conversion Point stacking of P wave receiver functions to investigate the topography on
A. Kaviani, E. Sandvol, A. Moradi, G. Rümpker, Zheng Tang, P. Mai   +5 more
semanticscholar   +1 more source

Putting the Femme in Feminist: Trans Feminism and the ‘Male Lesbian’ in the American Second Wave

Gender &History, EarlyView.
ABSTRACT A slur, a joke or a post‐structuralist case of mistaken identity. To the extent that the male lesbian has been discussed, she has figured dismissively. Yet throughout the period historicised as American feminism's second wave, potentially thousands of trans femmes organised under this identity. Despite being entirely overlooked in scholarship,
Aino Pihlak, Emily Cousens
wiley   +1 more source

Seismic structure of the lithosphere and upper mantle beneath the ocean islands near mid-oceanic ridges [PDF]

Solid Earth, 2014
Deciphering the seismic character of the young lithosphere near mid-oceanic ridges (MORs) is a challenging endeavor. In this study, we determine the seismic structure of the oceanic plate near the MORs using the P-to-S conversions isolated from quality ...
C. Haldar, P. Kumar, M. Ravi Kumar
doaj   +1 more source

Deep mantle structure and the postperovskite phase transition [PDF]

, 2005
Seismologists have known for many years that the lowermost mantle of the Earth is complex. Models based on observed seismic phases sampling this region include relatively sharp horizontal discontinuities with strong zones of anisotropy, nearly vertical ...
Gurnis, M., Helmberger, D., Lay, T., Ni, S.   +3 more
core   +1 more source

Sulfide enrichment at an oceanic crust-mantle transition zone: Kane Megamullion (23°N, MAR)

Geochimica et Cosmochimica Acta, 2018
The Kane Megamullion oceanic core complex located along the Mid-Atlantic Ridge (23°30′N, 45°20′W) exposes lower crust and upper mantle directly on the ocean floor.
J. Ciążela, J. Koepke, H. Dick, R. Botcharnikov, A. Muszyński, M. Lazarov, S. Schuth, B. Pieterek, T. Kuhn   +8 more
semanticscholar   +1 more source

A ubiquitous low‐velocity layer at the base of the mantle transition zone [PDF]

Geophysical Research Letters, 2014
AbstractGlobal stacks of receiver functions clearly exhibit the upper mantle stratification. Besides the most prominent seismic discontinuities, such as the Moho and the 410 and 660 km discontinuities, a negative discontinuity is detected at a depth of ~600 km, indicating a low‐velocity layer at the base of the mantle transition zone.
Shen, X., Yuan, X., Li, X.
openaire   +3 more sources

Cuttings, Combings, Fettlings and Flock: Gender and Australian Wool ‘Waste’, 1900–1950

Gender &History, EarlyView.
ABSTRACT As Australia's wool industry produced vast amounts of fine fleece from the nineteenth century, the wool processing and clothes manufacturing industries generated waste – products like cuttings, combings, fettlings and flock. Salvaged and then sold to waste merchants, these and other materials had a second life.
Lorinda Cramer
wiley   +1 more source

Ab initio studies of structural instabilities in magnesium silicate perovskite

, 1995
Density-functional simulations are used to calculate structural properties and high-symmetry phonons of the hypothetical cubic phase, the stable orthorhombic phase and an intermediate tetragonal phase of magnesium silicate perovskite.
Ackland, G. J., Warren, M. C.
core   +1 more source

Localized seismic deformation in the upper mantle revealed by dense seismic arrays [PDF]

, 2016
Seismicity along continental transform faults is usually confined to the upper half of the crust, but the Newport-Inglewood fault (NIF), a major fault traversing the Los Angeles basin, is seismically active down to the upper mantle.
Ampuero, J. P., Clayton, R. W., Inbal, A.   +2 more
core   +1 more source