Origin of Magmatic Harzburgite as a Result of Boninite Magma Evolution – An Illustration Using Layered Harzburgite-Dunite Cumulate From the Troodos Ophiolite Complex [PDF]
Lithos, 2020 Abstract Olivine (Ol) and orthopyroxene (Opx) are the primary liquidus phases of boninite in modern subduction settings and in many ophiolite complexes. It is thus straightforward to expect the formation of harzburgite cumulate resulting from boninite magma evolution. However, such magmatic harzburgite has been rarely studied.
Yaoling Niu, Meng Duan, Yanhong Chen
exaly +5 more sources
Genesis of Hawaiian lavas by crystallization of picritic magma in the deep mantle [PDF]
Nature Communications, 2023 Here the authors demonstrate that Hawaiian lavas are formed by partial melting of mantle peridotite with subsequent fractionation of clinopyroxene and garnet in the deep magma chamber (90 km) and reequilibration with harzburgite at a shallower depth (
Junlong Yang +3 more
doaj +2 more sources
Slab stagnation sustained by wet harzburgite and dry basaltic slab assemblages [PDF]
Nature CommunicationsSlab stagnation in the mantle transition zone is critical for the mantle dynamics and evolution of Earth’s interior but remains poorly understood. Here we present seismic images that show two key features near Eurasia’s northeastern margin: 1) a 700-km ...
Danian Shi +10 more
doaj +2 more sources
Frontiers in Earth Science, 2022 We report abundances of major trace and volatile elements in an orthopyroxenite vein cutting a sub-arc, mantle-derived, spinel harzburgite xenolith from Kamchatka.
A. Bénard +6 more
doaj +2 more sources
Natural hydrogen generation potential of the serpentinized ultramafic rocks of the Biga Peninsula (NW Anatolia-Türkiye): petrographic controls, reaction pathways, and initial quantitative estimates [PDF]
Scientific ReportsNatural hydrogen (H2), increasingly referred to as geologic or white hydrogen, has lately attracted considerable interest as a clean and potentially renewable energy resource produced through various subsurface geochemical processes.
İsmail Onur Tunç
doaj +2 more sources
Phase Transitions of Harzburgite and Buckled Slab Under Eastern China [PDF]
Geochemistry, Geophysics, Geosystems, 2013 AbstractPhase relations in harzburgite have been determined between 14 and 24 GPa and 1473 and 1673 K. At 1673 K, harzburgite transformed to wadsleyite + garnet + clinopyroxene below 19 GPa and decomposed into an assemblage of ringwoodite + garnet + stishovite above 20 GPa.
Yanbin Wang, Craig R. Bina, Zhenmin Jin
exaly +2 more sources
Diffusion-induced lithium isotopic heterogeneity in olivines from peridotites of an oceanized mantle lithosphere at the Yunzhug ophiolite (central Tibet) [PDF]
Scientific ReportsThis paper reports lithium concentrations and isotopic compositions of olivines in the oceanized subcontinental lithospheric mantle (SCLM) peridotites of the Tibetan Yunzhug ophiolite. The results show systematic Li isotope changes with distance from the
Ren-Deng Shi +6 more
doaj +2 more sources
Water exchange process and bulk composition regulate slab dynamics and deep earthquakes [PDF]
Nature CommunicationsWater strongly influences deep mantle processes, including geochemical cycles, slab dynamics, and deep-focus earthquakes. Yet the stability and interactions of hydrous minerals with nominally anhydrous minerals (NAMs) under the water-undersaturated ...
Jintao Zhu +3 more
doaj +2 more sources
Geophysical Monograph Series, Page 137-165., 2020 This book is Open Access. A digital copy can be downloaded for free from Wiley Online Library.
Explores the behavior of carbon in minerals, melts, and fluids under extreme conditions
Carbon trapped in diamonds and carbonate-bearing rocks in subduction zones are examples of the continuing exchange of substantial carbon ...
Konstantin Litasov +3 more
wiley +2 more sources
A novel mechanism of spheroidal weathering: a case study from the Monchepluton layered complex, Kola Peninsula, Russia [PDF]
Bulletin of the Geological Society of Finland, 2015 We describe an unusual pattern of spheroidally weathered surface developed in a mineralized harzburgite of Mount Kumuzhya, Monchepluton layered complex of Early Proterozoic age, Kola Peninsula, Russia.
A.Y. Barkov, A.A. Nikiforov, R.F. Martin
doaj +1 more source