scholarly journals Melting and metasomatism in upper mantle peridotite xenoliths from Labait, North-central Tanzania, and contrasting metasomatic styles in the Tanzanian lithospheric mantle

2019 ◽  
Keyword(s):  
Upper Mantle ◽  
Lithospheric Mantle ◽  
Mantle Peridotite ◽  
North Central ◽  
Peridotite Xenoliths

Microscale effects of melt infiltration into the lithospheric mantle: Peridotite xenoliths from Xilong, South China

Lithos ◽  
2015 ◽  
Vol 232 ◽  
pp. 111-123 ◽  
Author(s):  
Jianggu Lu ◽  
Jianping Zheng ◽  
William L. Griffin ◽  
Suzanne Y. O'Reilly ◽  
Norman J. Pearson
Keyword(s):  
South China ◽  
Lithospheric Mantle ◽  
Mantle Peridotite ◽  
Peridotite Xenoliths ◽  
Melt Infiltration

Fluid Assisted Recrystallization in Upper Mantle Peridotite Xenoliths from Kimberlites

1989 ◽  
Vol 30 (1) ◽  
pp. 133-152 ◽  
Author(s):  
M. R. DRURY ◽  
H. L. M.V. ROERMUND
Keyword(s):  
Upper Mantle ◽  
Mantle Peridotite ◽  
Peridotite Xenoliths

scholarly journals Multiple Metasomatism beneath the Nógrád–Gömör Volcanic Field (Northern Pannonian Basin) Revealed by Upper Mantle Peridotite Xenoliths

2017 ◽  
Vol 58 (6) ◽  
pp. 1107-1144 ◽  
Author(s):  
Nóra Liptai ◽  
Levente Patkó ◽  
István J. Kovács ◽  
Károly Hidas ◽  
Zsanett Pintér ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Pannonian Basin ◽  
Mantle Peridotite ◽  
Volcanic Field ◽  
Peridotite Xenoliths

scholarly journals Origin of kimberlite from the base of the upper mantle

2021 ◽  
Author(s):  
Wei-Dong Sun ◽  
Lipeng Zhang ◽  
Rui Li ◽  
Guozhi Xie ◽  
Lu Liu ◽  
...  
Keyword(s):  
Partial Melting ◽  
Upper Mantle ◽  
Lithospheric Mantle ◽  
Lower Mantle ◽  
Explosive Eruption ◽  
Ferric Iron ◽  
Mantle Peridotite ◽  
Explosive Eruptions ◽  
Stable Phase ◽  
Excess Carbon

Abstract Kimberlite is characterized by explosive eruption powered by excess carbon dioxides (CO2)1 and water2. Given that diamond is the dominant stable phase of carbon in the upper mantle3, it is obscure where does the excess CO2 in kimberlite has come from. Here we show that ferric iron oxidizes diamond at 1900K, 20GPa and 2000K, 25GPa, forming CO2. The lower mantle is dominated by bridgmanite, which is rich in ferric iron4. Bridgmanite decomposes once it is brought to the upper mantle, releasing extra ferric iron. Therefore, the oxidation of diamond may have been popularly occurring at the base of the upper mantle, forming CO2-rich carbonated domains that are the main source of kimberlite. The rising kimberlitic magma reaches the lithosphere mantle of thick cratons before it crosses the solidus line of mantle peridotite, and thus keeps its volatile-rich nature that drives explosive eruptions. When the lithospheric mantle is thinner than ~140 km, kimberlite changes into much less explosive magmas due to partial melting of mantle peridotite, and, consequently, entrained diamond is mostly oxidized during the magma’s slower ascension.

scholarly journals Phlogopite-Forming Reactions as Indicators of Metasomatism in the Lithospheric Mantle

Minerals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 685 ◽  
Author(s):  
Oleg Safonov ◽  
Valentina Butvina ◽  
Evgenii Limanov
Keyword(s):  
Free Energy ◽  
Gibbs Free Energy ◽  
Upper Mantle ◽  
Energy Minimization ◽  
Lithospheric Mantle ◽  
Naturally Occurring ◽  
Peridotite Xenoliths ◽  
Mantle Peridotites ◽  
Mineral Assemblages ◽  
Gibbs Free Energy Minimization

Phlogopite is widely accepted as a major mineral indicator of the modal metasomatism in the upper mantle within a very wide P–T range. The paper reviews data on various phlogopite-forming reactions in upper-mantle peridotites. The review includes both descriptions of naturally occurring reactions and results of experiments that model some of these reactions. Relations of phlogopite with other potassic phases, such as K-richterite, sanidine and K-titanates, are discussed. These data are taken as a basis for thermodynamic modeling of the phlogopite-forming reactions for specific mantle rocks in terms of log(aH2O) − log(aK2O) diagrams (pseudosections) using the Gibbs free energy minimization. These diagrams allow estimation of potassium-water activity relations during metasomatic transformations of mantle rocks, prediction sequences of mineral assemblages with respect to these parameters and comparison of metasomatic processes in the rocks of different composition. This approach is illustrated by examples from peridotite xenoliths from kimberlites.

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