Results 161 to 170 of about 2,647 (217)

Decoupling of high-pressure H2 production from serpentinization and magnetite in subduction zones

Siron G, Blanchard M, Aufort J, Williams S, Vitale-Brovarone A.   +4 more
europepmc   +1 more source

Olivine and Fe-isotopes in kimberlites indicate an iron-rich substrate for CLIPPIR and other sub-lithospheric diamonds. [PDF]

Nat Commun
Howarth GH, Giuliani A, Tau MM, Cai R, Liu J.   +4 more
europepmc   +1 more source

Diamonds reveal subducted slab harzburgite in the lower mantle [PDF]

Geology, 2023
AbstractCharacterizing compositional heterogeneity in Earth’s lower mantle is critical to understanding its dynamics. Three low-nitrogen diamonds from Koffiefontein (South Africa), containing inclusion assemblages of ferropericlase ± orthopyroxene ± magnesite, constrain diamond formation in an Mg-rich lower-mantle environment. Ferropericlase inclusions
Nicole A. Meyer, Thomas Stachel, D. Graham Pearson, Richard A. Stern, Jeffrey W. Harris, Michael J. Walter   +5 more
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Heterogeneity in upper-mantle lherzolites and harzburgites

Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1980
Abstract Harzburgite nodules from kimberlites can be subdivided into two groups on the basis of the CaO (0.24 compared with 0.96% by mass) and A12O3 (0.96 compared with 2.98% by mass) in their orthopyroxenes. Theoretically, the CaO and Al2O3 from the high-Al orthopyroxenes can be quantitatively represented as garnet and clinopyroxene ...
J. B. Dawson, J. V. Smith, R. L Hervig
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Multiple fluid pulses in a Samoan harzburgite

Chemical Geology, 1998
Noble gases trapped in fluid inclusions in residual mantle xenoliths from Samoa have a wide range in 4He/40Ar which anti-correlates with enrichments in non-atmospheric Ar, Ne and Xe isotopes and with the concentration of 40Ar trapped in the mineral. These correlations cannot be due to post-eruption loss of He from the inclusions, but are likely due to ...
Burnard, P. G., Farley, K. A., Turner, G.   +2 more
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Exsolution and hydration of pyroxenes from partially serpentinized harzburgites

Mineralogical Magazine, 2005
AbstractOrtho- and clinopyroxenes within partially-hydrated harzburgites from Elba and Val di Cecina (Italy) show lamellar exsolution textures and variable replacement by biopyriboles, talc-chlorite-serpentine mixed layers and serpentine. Chemical and geothermometric data suggest that the pyroxenes crystallized at 1240–1051°C, followed by subsolidus ...
VITI, C., MELLINI, M., RUMORI, C.
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Harzburgite and lherzolite subtypes in ophiolitic and oceanic environments

Earth and Planetary Science Letters, 1985
Abstract In most ophiolites the ultramafic section is harzburgitic. It is rarely composed of residual lherzolites, except for the local occurrence of impregnation lherzolites within harzburgitic massifs. Several characters (environmental formations, thickness and composition of the crust, geometry of the asthenospheric flow, serpentinization ...
F. Boudier, A. Nicolas
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Serpentinization of Alpine-type harzburgites

International Geology Review, 1979
(1979). Serpentinization of Alpine-type harzburgites. International Geology Review: Vol. 21, No. 3, pp. 299-306.
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Diogenites as polymict breccias composed of orthopyroxenite and harzburgite

Meteoritics & Planetary Science, 2010
Abstract– A few relatively unbrecciated olivine‐rich diogenites consist of an equilibrium assemblage of olivine and magnesian orthopyroxene (harzburgite). More common diogenites with smaller amounts of olivine are breccias containing two distinct orthopyroxenes—one magnesian and one ferroan. These diogenites are mixtures of a harzburgite lithology that
Andrew W. BECK, Harry Y. McSWEEN Jr.
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