Results 11 to 20 of about 2,132,735 (177)
Geochemistry, Geophysics, Geosystems, 2018 Juxtaposed terranes of highly varied tectonic history make up the contiguous U.S.: the tectonically active western U.S., the largely quiescent Archean and Proterozoic cratons of the central U.S., and the Phanerozoic orogen and rifted margin of the ...
Emily Hopper, Karen M. Fischer
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Application of a Premelting Model to the Lithosphere‐Asthenosphere Boundary
Geochemistry, Geophysics, Geosystems, 2020 A seismic discontinuity known as the G‐discontinuity, which has been prevailingly detected in the oceanic mantle, is considered to provide evidence of a sharp lithosphere‐asthenosphere boundary (LAB). We investigate whether this sharp LAB is explained by
Hatsuki Yamauchi, Yasuko Takei
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Effect of water on seismic attenuation of the upper mantle: The origin of the sharp lithosphere-asthenosphere boundary. [PDF]
Proc Natl Acad Sci U S A, 2023 Significance The origin of seismic wave attenuation observed in the oceanic asthenosphere is key to understanding the low viscosity of the asthenosphere and how it enables the relative motion of tectonic plates covering the Earth's surface.
Liu C +11 more
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Discovery of distinct lithosphere-asthenosphere boundary and the Gutenberg discontinuity in the Atlantic Ocean. [PDF]
Sci Adv, 2022 The plate tectonic theory requires a rigid lithosphere floating over a weak asthenosphere, separated by the lithosphere-asthenosphere boundary, which has been sometimes interpreted as the Gutenberg discontinuity. Using a deep seismic reflection technique,
Audhkhasi P, Singh SC.
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Wide-angle seismic reflections reveal a lithosphere-asthenosphere boundary zone in the subducting Pacific Plate, New Zealand. [PDF]
Sci Adv, 2022 New wide-angle seismic reflection data from offshore New Zealand show that the lithosphere-asthenosphere boundary (LAB) is more structured than previously thought.
Herath P +4 more
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Melt focusing along lithosphere-asthenosphere boundary below Axial volcano. [PDF]
NatureBeneath oceanic spreading centres, the lithosphere–asthenosphere boundary (LAB) acts as a permeability barrier that focuses the delivery of melt from deep within the mantle towards the spreading axis1.
Kent GM +5 more
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Elastic properties of silicate melts: Implications for low velocity zones at the lithosphere-asthenosphere boundary. [PDF]
Sci Adv, 2017 New model for seismic velocity reductions indicates melts in textural equilibrium consistent with strong coupling at the LAB. Low seismic velocity regions in the mantle and crust are commonly attributed to the presence of silicate melts. Determining melt
Clark AN, Lesher CE.
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Satellite tidal magnetic signals constrain oceanic lithosphere-asthenosphere boundary. [PDF]
Sci Adv, 2016 Researchers present results on the oceanic upper mantle electrical structure revealed by satellite-detected tidal magnetic signals. The tidal flow of electrically conductive oceans through the geomagnetic field results in the generation of secondary ...
Grayver AV +5 more
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Geophysical Journal International, 2023 The lithosphere-asthenosphere boundary (LAB) separates the rigid lithospheric plate above with the ductile and convective asthenosphere below and plays a fundamental role in plate tectonic processes.
V. Vaddineni, Satish C Singh
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Geochemistry Geophysics Geosystems, 2022 Hot plumes rising from Earth's deep mantle are thought to cause uplift, rifting and large igneous province (LIP) emplacement. LIP volcanism in continents often spans tens of Ma and scatters unevenly over broad areas.
C. Civiero, S. Lebedev, N. Celli
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