Results 41 to 50 of about 17,487 (279)
Geochemistry, Geophysics, Geosystems, 2014 The Samoan islands of Ta'u and Ofu/Olosega (Ofol hereafter) are single shield volcanoes that have erupted alkali basalt for the past 70 and 440 kyr, respectively.
Stanley R. Hart, Matthew G. Jackson
doaj +1 more source
Геодинамика и тектонофизика, 2021 We propose a model of decompression melting, separation, migration and freezing of the melt in the upper mantle during the convective instability process.
B. V. Lunev, V. V. Lapkovsky
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
Melt channelization in ascending mantle [PDF]
Journal of Geophysical Research: Solid Earth, 2009 We study a model for channels of magma flow within mantle undergoing decompression melting. Cylindrical conduits in a viscous, porous, compacting matrix are considered, and it is found that the dynamics of the conduit walls are governed by the competition between melting (caused by decompression) and viscous closure (caused by the reduced pressure in ...
Hewitt, I, Fowler, A
openaire +2 more sources
The Meaning of Pressure for Primary Magmas: New Insights From PRIMELT3‐P
Geochemistry, Geophysics, Geosystems, 2023 This paper reports new software, PRIMELT3‐P, for computing the pressure and temperature range over which a primary basaltic magma was formed by adiabatic decompression and fractional melting of fertile mantle peridotite.
Claude T. Herzberg +2 more
doaj +1 more source
Chemistry – A European Journal, EarlyView.The synthesis of 2‐methyl propellane and its conversion to various 1,2‐ and 1,2,3‐di‐ and trisubstituted bicyclopentanes is reported. Abstract Bicyclo[1.1.1]pentanes (BCPs) have emerged as isosteric replacements for mono‐ and para‐substituted benzene rings in medicinal and materials applications, involving substitution at the BCP bridgehead (1,3 ...
Sean R. Verschaeve +4 more
wiley +1 more source
Sr-Nd-Pb-Hf isotope results from ODP Leg 187: Evidence for mantle dynamics of the Australian-Antarctic Discordance and origin of the Indian MORB source [PDF]
, 2002 New high precision PIMMS Hf and Pb isotope data for 14–28 Ma basalts recovered during ODP Leg 187 are compared with zero-age dredge samples from the Australian-Antarctic Discordance (AAD).
Barry, Tiffany Louise +17 more
core +1 more source