scholarly journals Early carbonatite magmatism at Oldoinyo Lengai volcano (Tanzania): carbonatite–silicate melt immiscibility in Lengai I melt inclusions

2021 ◽  
Vol 353 (S2) ◽  
pp. 1-16
Author(s):  
Lydéric France ◽  
Florian Brouillet ◽  
Sarah Lang
Keyword(s):  
Melt Inclusions ◽  
Silicate Melt ◽  
Oldoinyo Lengai

scholarly journals New method for initial composition determination of crystallized silicate melt inclusions

2018 ◽  
Vol 483 ◽  
pp. 162-173 ◽  
Author(s):  
Laura Créon ◽  
Gilles Levresse ◽  
Laurent Remusat ◽  
Hélène Bureau ◽  
Gerardo Carrasco-Núñez
Keyword(s):  
Melt Inclusions ◽  
New Method ◽  
Silicate Melt ◽  
Initial Composition ◽  
Composition Determination

scholarly journals Fluid-Rock Interaction in the Lower Crust Based on Silicate Melt Inclusions in Garnet Granulite Xenoliths

2020 ◽  
Author(s):  
Bianca Németh ◽  
Kálmán Török ◽  
Eniko Bali ◽  
Zoltan Zajacz ◽  
Csaba Szabó
Keyword(s):  
Lower Crust ◽  
Melt Inclusions ◽  
Silicate Melt ◽  
Rock Interaction ◽  
Garnet Granulite ◽  
Granulite Xenoliths

scholarly journals Origin of alkali-rich volcanic and alkali-poor intrusive carbonatites from a common parental magma

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ivan F. Chayka ◽  
Vadim S. Kamenetsky ◽  
Nikolay V. Vladykin ◽  
Alkiviadis Kontonikas-Charos ◽  
Ilya R. Prokopyev ◽  
...  
Keyword(s):  
Empirical Evidence ◽  
Fractional Crystallization ◽  
Melt Inclusions ◽  
Parental Magma ◽  
Progressive Increase ◽  
Topical Problem ◽  
Oldoinyo Lengai ◽  
Southern Siberia ◽  
Magmatic Stage ◽  
Common Parent

AbstractThe discrepancy between Na-rich compositions of modern carbonatitic lavas (Oldoinyo Lengai volcano) and alkali-poor ancient carbonatites remains a topical problem in petrology. Although both are supposedly considered to originate via fractional crystallization of a “common parent” alkali-bearing Ca-carbonatitic magma, there is a significant compositional gap between the Oldoinyo Lengai carbonatites and all other natural compositions reported (including melt inclusions in carbonatitic minerals). In an attempt to resolve this, we investigate the petrogenesis of Ca-carbonatites from two occurrences (Guli, Northern Siberia and Tagna, Southern Siberia), focusing on mineral textures and alkali-rich multiphase primary inclusions hosted within apatite and magnetite. Apatite-hosted inclusions are interpreted as trapped melts at an early magmatic stage, whereas inclusions in magnetite represent proxies for the intercumulus environment. Melts obtained by heating and quenching the inclusions, show a progressive increase in alkali concentrations transitioning from moderately alkaline Ca-carbonatites through to the “calcite CaCO3 + melt = nyerereite (Na,K)2Ca2(CO3)3” peritectic, and finally towards Oldoinyo Lengai lava compositions. These results give novel empirical evidence supporting the view that Na-carbonatitic melts, similar to those of the Oldoinyo Lengai, may form via fractionation of a moderately alkaline Ca-carbonatitic melt, and therefore provide the “missing piece” in the puzzle of the Na-carbonatite’s origin. In addition, we conclude that the compositions of the Guli and Tagna carbonatites had alkali-rich primary magmatic compositions, but were subsequently altered by replacement of alkaline assemblages by calcite and dolomite.

Rhönite in alkali basalts: silicate melt inclusions in olivine phenocrysts

2011 ◽  
Vol 52 (11) ◽  
pp. 1334-1352 ◽  
Author(s):  
V.V. Sharygin ◽  
K. Kóthay ◽  
Cs. Szabó ◽  
T.Ju. Timina ◽  
K. Török ◽  
...  
Keyword(s):  
Melt Inclusions ◽  
Silicate Melt ◽  
Alkali Basalts

scholarly journals Silicate Melt Inclusions in Diamonds of Eclogite Paragenesis from Placers on the Northeastern Siberian Craton

Minerals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 412 ◽  
Author(s):  
Vladislav Shatsky ◽  
Dmitry Zedgenizov ◽  
Alexey Ragozin ◽  
Viktoriya Kalinina
Keyword(s):  
Melt Inclusions ◽  
Silicate Melt ◽  
Aggregation State ◽  
Cooling Stage ◽  
Spectroscopic Analyses ◽  
New Findings ◽  
High Degree ◽  
Raman Spectral ◽  
Raman Spectral Analysis ◽  
Primary Melt

New findings of silicate-melt inclusions in two alluvial diamonds (from the Kholomolokh placer, northeastern Siberian Platform) are reported. Both diamonds exhibit a high degree of N aggregation state (60–70% B) suggesting their long residence in the mantle. Raman spectral analysis revealed that the composite inclusions consist of clinopyroxene and silicate glass. Hopper crystals of clinopyroxene were observed using scanning electron microscopy and energy-dispersive spectroscopic analyses; these are different in composition from the omphacite inclusions that co-exist in the same diamonds. The glasses in these inclusions contain relatively high SiO2, Al2O3, Na2O and, K2O. These composite inclusions are primary melt that partially crystallised at the cooling stage. Hopper crystals of clinopyroxene imply rapid cooling rates, likely related to the uplift of crystals in the kimberlite melt. The reconstructed composition of such primary melts suggests that they were formed as the product of metasomatised mantle. One of the most likely source of melts/fluids metasomatising the mantle could be a subducted slab.

Coexisting silicate melt inclusions and H2O-bearing, CO2-rich fluid inclusions in mantle peridotite xenoliths from the Carpathian–Pannonian region (central Hungary)

2010 ◽  
Vol 274 (1-2) ◽  
pp. 1-18 ◽  
Author(s):  
Károly Hidas ◽  
Tibor Guzmics ◽  
Csaba Szabó ◽  
István Kovács ◽  
Robert J. Bodnar ◽  
...  
Keyword(s):  
Fluid Inclusions ◽  
Melt Inclusions ◽  
Mantle Peridotite ◽  
Silicate Melt ◽  
Peridotite Xenoliths

Melt-wall rock interaction in the mantle shown by silicate melt inclusions in peridotite xenoliths from the central Pannonian Basin (western Hungary)

Island Arc ◽  
2009 ◽  
Vol 18 (2) ◽  
pp. 375-400 ◽  
Author(s):  
Csaba Szabó ◽  
Károly Hidas ◽  
Enikő Bali ◽  
Zoltán Zajacz ◽  
István Kovács ◽  
...  
Keyword(s):  
Melt Inclusions ◽  
Pannonian Basin ◽  
Wall Rock ◽  
Silicate Melt ◽  
Rock Interaction ◽  
Peridotite Xenoliths
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