Observation of incongruent melting in Cu10Hf7

2006 ◽  
Vol 27 (5) ◽  
pp. 477-481 ◽  
Author(s):  
R. H. Woodman ◽  
B. R. Klotz ◽  
L. J. Kecskes
Keyword(s):  
Incongruent Melting

Ultramafic-alkaline-carbonatite complexes as a result of two-stage melting of mantle plume: evidence from the mid-paleoproterozoic Tiksheozero intrusion, Northern Karelia, Russia

2019 ◽  
Vol 486 (4) ◽  
pp. 460-465
Author(s):  
E. V. Sharkov ◽  
A. V. Chistyakov ◽  
M. M. Bogina ◽  
O. A. Bogatikov ◽  
V. V. Shchiptsov ◽  
...  
Keyword(s):  
Fractional Crystallization ◽  
Mantle Plume ◽  
Large Igneous Province ◽  
Intrusive Complex ◽  
Incongruent Melting ◽  
Isotopic Data ◽  
Two Stage ◽  
Similar Composition ◽  
Igneous Province ◽  
Alkaline Magmas

Tiksheozero ultramafic-alkaline-carbonatite intrusive complex, like numerous carbonatite-bearing complexes of similar composition, is a part of large igneous province, related to the ascent of thermochemical mantle plume. Our geochemical and isotopic data evidence that ultramafites and alkaline rocks are joined by fractional crystallization, whereas carbonatitic magmas has independent origin. We suggest that origin of parental magmas of the Tiksheozero complex, as well as other ultramafic-alkaline-carbonatite complexes, was provided by two-stage melting of the mantle-plume head: 1) adiabatic melting of its inner part, which produced moderately-alkaline picrites, which fractional crystallization led to appearance of alkaline magmas, and 2) incongruent melting of the upper cooled margin of the plume head under the influence of CO2-rich fluids  that arrived from underlying zone of adiabatic melting gave rise to carbonatite magmas.

Shock‐induced incongruent melting of olivine in Kamargaon L6 chondrite

2021 ◽  
Author(s):  
Kishan Tiwari ◽  
Sujoy Ghosh ◽  
Masaaki Miyahara ◽  
Dwijesh Ray
Keyword(s):  
Incongruent Melting

scholarly journals Exsolution Lamellae in Orthopyroxene of Lherzolite from the Pauza Ultramafic Rocks, Ne Iraq: Evidence of Deep Mantle Signature in the Zagros Suture Zone

2013 ◽  
Vol 2 (9) ◽  
pp. 102-115
Author(s):  
Yousif Osman Mohammad ◽  
Nabaz Rashid Hama Aziz
Keyword(s):  
High Pressure ◽  
Upper Cretaceous ◽  
Suture Zone ◽  
Ultramafic Rocks ◽  
Chromian Spinel ◽  
Spinel Peridotite ◽  
Incongruent Melting ◽  
Fine Grained ◽  
Ultra High Pressure ◽  
Deep Mantle

The Pauza ultramafic body is part of Upper Cretaceous Ophiolitic massifs of the Zagros Suture Zone, NE Iraq. The present study reveals evidence of Ultra-high pressure (UHP), and deep mantle signature of these peridotites in the Zagros Suture Zone throughout the observation of backscattered images and micro analyses which have been performed on orthopyroxen crystals in lherzolite of Pauza ultramafic rocks.Theorthopyroxen shows abundant exsolution lamellae of coarse unevenly distributed clinopyroxene coupled with the submicron uniformly distributed needles of Cr-spinel. The observed clusters of Opx–Cpx–Spl represent the decompression products of pyrope-rich garnet produced as a result of the transition from ultra-high pressure garnet peridotite to low-pressure spinel peridotite (LP). Neoblastic olivine (Fo92 – 93) with abundant multi-form Cr- spinel inclusions occurs as a fine-grained aggregate around orthopyroxene, whereas coarse olivine (Fo90-91) free from chromian-spinel is found in matrix. The similarity of the Cr-spinel lamellae orientations in both olivine and orthopyroxene, moreover, the enrichments of both Cr and Fe3+ in the Cr-spinel inclusions in neoblastic olivine relative to Cr-spinel lamellae in orthopyroxene, suggest that spinel inclusions in olivine have been derived from former Cr-spinel lamellae in orthopyroxene. Neoblastic olivine is formed by reaction of silica-poor ascending melt and orthopyroxene. It is inferred that the olivines with multi-form spinel inclusions has been formed by incongruent melting of pre-existing spinel lamellae-rich orthopyroxene.

Incongruent Melting LaxYySc4-x-y(BO3)4: LYSB Nonlinear Optical Crystal Grown by the Czochralski Method

2019 ◽  
Vol 11 (23) ◽  
pp. 20987-20994 ◽  
Author(s):  
Lucian Gheorghe ◽  
Madalin Greculeasa ◽  
Alin Broasca ◽  
Flavius Voicu ◽  
George Stanciu ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Czochralski Method ◽  
Nonlinear Optical Crystal ◽  
Incongruent Melting ◽  
Optical Crystal

Investigation of the Particle Size Effect on the Peritectic Melting of FeSn2 Particles in FeSn2-FeSn Nanocomposites

2006 ◽  
Vol 118 ◽  
pp. 651-654
Author(s):  
Young Soon Kwon ◽  
Pyuck Pa Choi ◽  
Ji Soon Kim ◽  
Dae Hwan Kwon ◽  
K.B. Gerasimov
Keyword(s):  
Particle Size ◽  
Size Effect ◽  
Melting Temperature ◽  
Local Heating ◽  
Particle Size Effect ◽  
X Ray Diffraction ◽  
Incongruent Melting ◽  
Large Particle Size ◽  
Scanning Calorimetry ◽  
Peritectic Melting

The particle size effect on the peritectic melting of FeSn2 particles in FeSn-FeSn2 nanocomposites was studied using differential scanning calorimetry and X-ray diffraction. FeSn-10 wt.% FeSn2 compounds, mechanically milled for 30 min and slowly heated in a differential scanning calorimeter, showed incongruent melting at 680 K. Although FeSn2 grains grew from 10 to 40 nm upon heating before peritectic melting set in, the melting temperature was more than 100 K lower than the equilibrium value. A small latent heat during peritectic melting and a large amount of interfacial energy of FeSn-FeSn2 nanocomposites are held responsible for this large particle size effect. Grain growth is hardly possible in the case of rapid local heating during mechanical milling. Therefore, a decrease in the peritectic melting temperature is even expected to be substantially larger.

Diagramme de phase du système Rb–Rb2O: le sous-oxyde de rubidium Rb3O

1969 ◽  
Vol 47 (14) ◽  
pp. 2639-2643 ◽  
Author(s):  
Ph. Touzain
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Liquid Mixture ◽  
Direct Synthesis ◽  
Incongruent Melting ◽  
Gaseous Oxygen

The Rb–Rb2O diagram system has been obtained by the technique of differential thermal analysis. The samples of different compositions were prepared by direct synthesis from doubly distilled rubidium and gaseous oxygen. This system shows a golden eutectic which melts at −10 °C for a composition close to RbO0.2, and a compound which exhibits incongruent melting (at 48 °C). The latter can be isolated as copper colored crystals by centrifugation of the liquid mixture; it is a sub-oxide with the formula Rb3O. Dismutation of Rb2O in Rb2O2 and Rb is observed at 410 °C.

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