Results 41 to 50 of about 338,697 (184)
melting of the Siberian Mantle Plume [PDF]
Geophysical Research Letters, 1998 The Putorana basalts, comprising ∼90% of the Siberian Traps (ST), have had their chemistry modified from primary tholeiitic picritic magmas by ∼12% crystallization of olivine. Major‐trace element ratios, and Nd isotopes of these lavas are consistent with their origin from a relatively undepleted plume by 12–16% rapid decompressional melting at ∼50–80 ...
Asish R. Basu +2 more
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Frontiers in Earth Science, 2018 In this second installment of a series that aims to investigate the dynamic interaction between the composition and abundance of the solid mantle and its melt products, the classic interpretation of fractional melting is extended to account for the ...
Massimiliano Tirone
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Petrogenesis and tectonic significance of mafic–ultramafic rocks from Southwest Yunnan, China
Comptes Rendus. Géoscience, 2020 This study focuses on the mafic–ultramafic lavas of the Early Carboniferous outcrop in Mangxin, southwestern Yunnan, China. Picrites with 26–32 wt% MgO and a quenched texture are the most significant components of this rock association.
Shi, Qing, Fang, Nianqiao
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Partial melting in the deepest mantle [PDF]
Geophysical Research Letters, 2002 We have compared the travel times of direct (P, S) and core‐reflected (PcP, ScS) phases recorded in southern Africa from earthquakes occurring in the Scotia Arc region. The low‐velocity region beneath the south Atlantic is explored by calculating ScS‐S and PcP‐P travel‐time residuals to determine the correlation and magnitude of Vs and Vp reductions in
N. A. Simmons, S. P. Grand
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Dehydration Melting Below the Undersaturated Transition Zone
Geochemistry, Geophysics, Geosystems, 2020 A reflector 70–130 km below the base of the transition zone beneath Tibet is observed in receiver functions and underside seismic reflections, at depths consistent with the transition of garnet to bridgmanite.
W. R. Panero +5 more
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Melt mapped inside Earth’s mantle
Nature, 2020 An analysis of seismic data reveals the location and quantity of melted rock, known as melt, in Earth’s upper mantle. The results show how these factors are correlated with the movement of the planet’s tectonic plates.
openaire +2 more sources
Magmatism of the Kenya Rift Valley : a review. [PDF]
, 2003 Tertiary–Recent magmatism in the Kenya Rift Valley was initiated c. 35 Ma, in the northern part of Kenya. Initiation of magmatism then migrated southwards, reaching northern Tanzania by 5–8 Ma.
MacDonald, Raymond
core +4 more sources
Earth and Planetary PhysicsCarbonate minerals are key carriers of carbon into the Earth’s interior, yet their stability and melting behavior under lower mantle conditions remain incompletely constrained.
ZhongShan He +5 more
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Stability of (Mg,Fe)SiO3 perovskite and the structure of the lowermost mantle [PDF]
, 1992 Thermodynamic analysis shows that (Mg,Fe)SiO3 perovskite is stable throughout the likely pressure, temperature and compositional regime of the Earth's mantle.
Bukowinski, MST, Stixrude, L
core
Rapid transition from primary to secondary crust building on the Moon explained by mantle overturn
Nature Communications, 2023 Geochronology indicates a rapid transition (tens of Myrs) from primary to secondary crust building on the Moon. The processes responsible for initiating secondary magmatism, however, remain in debate.
Tabb C. Prissel +3 more
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