AGU journal highlights -- Aug. 6, 2009
... and brightening
Can seismic variation in the mantle
be explained by temperature alone?
New model ...
8. Can seismic variation in the mantle
be explained by temperature alone?
The structure and dynamics of Earth's mantle
are of great importance because they determine ...
Extraterrestrial platinum was 'stirred' into the Earth
... all the available platinum with it, leaving the mantle
and crust with none," Dr Barnes said.
... for the people who study the dynamics of mantle
processes and the mechanisms that cause plate ...
Osmium isotopes are widely used as tracers of mantle
processes, but there has been a mismatch between ...
Mollusks taste memories to build shells
... "The shell is laid down in layers, so the mantle
is sensing the history of the mollusk's ... of neurons connecting the sensing cells in the mantle
with the secretory cells that produce calcium ... mates.
"The pigment is a cue to get the mantle
in register so it builds the right shaped shell, ...
February 2009 Geology and GSA Today media highlights
... related to flood basalts suggest the existence of mantle
plumes with large heads and thin trailing tails ... plumes). Seismic data suggest the existence of mantle
plumes with thick tails (diapir plumes). The ... are different, and in a chemically homogeneous mantle
both types are not predicted to coexist. Lenardic ...
The continents as a heat blanket
... The enormous heat in the Earth's core and Earth's mantle
generates the flow of rocks within the Earth's ... between the convective movement in the Earths mantle
and the continental drift. V. Trubitsin, M. Kaban ... of the continents, the structures of the Earth's mantle
obtained through geophysical measurements, and ...
Ancient magma 'superpiles' may have shaped the continents
... the other, Panero said. Plates sink into the mantle
as part of the normal processes that shape the ... Panero said. "We know that the rest of the mantle
is always moving. So why are the piles still ... Hot rock constantly migrates from the base of the mantle
up to the crust, she explained. Hot portions of ...
September Geology and GSA Today media highlights
... of large delta systems elsewhere.
upwelling, magmatic differentiation, and the ... regional-scale variations in magma supply or mantle
temperature. Toomey and Hooft, however, show that ... crust. Seismic images of crustal and upper mantle
structure are combined with gravity data and lava ...
August 2008 Geology and GSA Today media highlights
... now at considerable subsurface depths.
earthquakes frozen in mylonitized ultramafic ... from Balmuccia peridotite, a "fossil" of mantle
earthquakes. They report a case in which a ... as deep as the boundary between Earth's core and mantle
(located 2900 kilometers deep).
Journey to the center of the earth: Discovery sheds light on mantle formation
... in a paper titled Ancient, highly heterogeneous mantle
beneath Gakkel Ridge, Arctic Ocean, appearing ... surface. Mid-ocean ridges like Gakkel, where mantle
rock is slowly pushing upward to form new ... locations the least volcanic activity and most mantle
exposure ever discovered on a mid-ocean ridge, ...
December GEOLOGY and GSA TODAY media highlights
... cycles and survival of early hominins; an ancient mantle
plume and the break-up of Rodinia; relationship ... spatial and temporal overlap of internal mantle
flow (endogenic, or internal process) and a large ... in South China: First evidence for >1500 C mantle
melts by a ...
November GEOLOGY and GSA TODAY Media Highlights
... to ultramafic components of the crust to the mantle
to accomplish the evolution from arc crust to ... of continental crust in intra-oceanic arcs.
detachment faults and the break up of cold ... allow doming and exhumation of the deeply buried mantle
rocks from underneath the continental crust. ...
September Geology and GSA Today media highlights
... modern humans out of Africa; relationship of mantle
plumes and supercontinent cycles; relationship of ... to the deposit, including a small but detectable mantle
contribution to the ore system. These new results ...
Supercontinent cycles disrupted by strong mantle
Benjamin R. Phillips, Los Alamos ...
July 2008 GEOLOGY and GSA Today media highlights
Ghosts of lithospheres past: Imaging an evolving lithospheric mantle
in southern Africa
Alan F. Kobussen et al., GEMOC, Dept. of Earth and ... the rhyolite and granite, as hot basaltic magma was introduced from the mantle
during crustal rifting. In the current study, the same zircons were ...
June GEOSPHERE media highlights
... Topics of interest include common ground in the disagreement between mantle
plume and lithospheric mantlelower crust delamination models; a USGS Great ... of these provinces to a model of delamination of the Earth's lithospheric mantle
and lower crust. The two models, however, are not mutually exclusive. ...
March GEOLOGY and GSA TODAY media highlights
... and cooled from temperatures of ~1500 C. This result implies that mantle
flow in convergent plate boundaries occurs on a larger scale that ... where the descending plates dehydrated and generated melts in overlying mantle
and crust. At least twice, fragments of the oceanic plates became doubled ...
AGU journal highlights -- March 12, 2009
... material that underwent these observed crystal lattice transformations.
Transformation textures in post-perovskite: Understanding mantle
flow in the D'' layer of the Earth
N. P. Walte, F. Heidelbach, N. Miyajima, D. J. Frost, and D. C. Rubie: Bayerisches Geoinstitut, ...
January-February GSA Bulletin media highlights
... this process is of general applicability to this rock type. Formation of such volcanoes, thus, depends on a suitable source of heat from the Earth's mantle
during mountain building processes.
Formation and dating of a salt pillar in Mount Sedom diapir, Israel
Amos Frumkin, Department of ...
January GEOLOGY media highlights
... units can perform very well as safe seals to store injected CO 2 and prevent upward leakage for time scales much longer than required.
diamonds from South Australia: A record of Pacific subduction at the Gondwanan margin
Ralf Tappert et al., Geology and Geophysics, School of ...
AGU journal highlights: Nov. 11, 2008
... (MEP), following the second law of thermodynamics, has been suggested as a self-organizing mechanism for many phenomena, including atmospheric and mantle
convection and the self-organization of sand grains by loading in sandpiles. Noting that natural seismicity in the Earth's crust is produced by ...
Measuring calcium in serpentine soils
... the fertilizer needed.
Serpentine soils are formed primarily from serpentinite rocks. These rocks are formed from pieces of the earth's mantle
through a metamorphic process involving heat and water. Serpentine soils can be found throughout northern California.
Scientists at University of ...
Tasty meal out of reach
... a tasty meal for large grazers, is only safe from them within prickly shrubs. Ultimately, this leads to magnificent single oaks surrounded by a mantle
NCI renewal grant to develop new cancer therapies
... a multi-institutional trial of vorinostat and bortezomib, a proteasome inhibitor, in patients with refractory diffuse lymphocytic B-cell lymphoma or mantle
Beginning scientists receive presidential awards
... data in a variety of ways, he performs detailed imaging of the earth's crust and mantle. The goal is to provide new constraints on structures in the mantle
to 700 kilometers and deeper, and to connect that with the Earth's plate tectonic history.
"Each earthquake as it occurs provides unique ...
October Geology and GSA Today media highlights
... in marginal basins of the southeastern Swedish Baltic Sea provides a new perspective of global ice-volume changes and the isostatic adjustment of the mantle
after the retreat of the Scandinavian Ice Sheet. Yu et al. attribute a rapid local sea-level rise of roughly 4.5 meters ca. 7600 calibrated (cal) ...
BiovaxID?yields 89 percent survival in patients with aggressive non-Hodgkins
... BiovaxID yielded an 89% survival rate in mantle
cell lymphoma patients.
The median follow-up ... Phase 2 clinical study, patients with untreated mantle
cell non-Hodgkin's lymphoma (NHL) were ... from the Phase 2 clinical trial using BiovaxID in mantle
cell lymphoma suggest the vaccine could ...
Spelling out cancer on the nanoscale
... and AKT proteins in the lymph nodes obtained from patients with Burkitt’s, mantle
cell, or follicular lymphoma. The nano-fluidic system reported that MYC was overexpressed in Burkitt’s, while BCL2 was overexpressed in mantle
cell and follicular lymphoma patients. In parallel, traditional Western ...
Hydrogen and methane provide raw energy for life at 'Lost City'
... field via serpentinization, a chemical reaction between seawater and the mantle
rock on which Lost City sits. The resulting fluids are 105 F to 170 F. At ... she's 100 percent sure others exist because there are so many other places mantle
rock has been thrust up through the seafloor, exposing it to seawater and ...
Large size crucial for Amazon forest reserves
... on bird communities in these Amazon landscapes.
Area is important because the forest is spatially diverse. "What might look like a vast mantle
of homogeneous green is actually a multicolored mosaic", said Lovejoy. And species that occur throughout the forest at the large scale actually may ...
Volcanic eruptions, ancient global warming linked
... in the Atlantic Ocean.
"We think the first volcanic eruptions began about 61 million years ago and then it took another 5 million years for the mantle
to weaken, the continent to thin and the molten material to rise to the surface," Duncan said. "It was like lifting a lid. The plate came apart and ...
Sea slug mixes chemical defense before firing at predators
... produces the purple dye in the secretion.
"Aplysia packages these innocuous precursors separately and then releases them simultaneously into its mantle
cavity at the precise time when they are needed," explained Derby. "This mechanism insures the secretion's potency against attacking predators to ...