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Showing 1 to 20 of 123 for “"partial melting"”.
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Partial melting relationships of three granitic rocks,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1969.
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Partial Melting on FeO-Rich Asteroids: Insights to the First Stage of Planetary Differentiation
The melting of planetesimals was a widespread geologic phenomenon taking place in the early inner solar system. Petrologic and geochemical evidence shows that this melting frequently resulted in full differentiation of planetary bodies into a core, mantle, and crust. The extent of this early …
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Evaluation of partial melting models of the origin of some Australian basalts : trace element evidence.
Thesis. 1975. M.S.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.
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Experimentally generated partition coefficients for the first-row transition elements during eclogite partial melting at three gigapascals
… in their generation. My simple forward melting modeling shows that partial melts of peridotite match OIB FRTE signatures just as well as melts from mixed peridotite plus eclogite sources, but there are some signatures that are not well matched by either.
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Granulite-facies metamorphism, fluid buffering and partial melting in the Buffels River area of the Namaqualand metamorphic complex, South Africa
… Particular emphasis is placed on the role of partial melting and the infiltration and buffering of metamorphic fluid is examined.
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Geologic and petrologic evidence for granulite facies partial melting in the Garies-Platbakkies supracrustal gneiss belt, Namaqualand metamorphic complex, South Africa
… for generating significant quantities of partial melt. The rocks of the study area contain an early Dl fabric. This is refolded in tight, E-plunging D2 crenulation folds. D2 mineral fabrics pre-date the metamorphic peak. D3 open, asymmetric folds are N-vergent and fold the crystalline …
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ΜΕΛΕΤΗ ΤΗΣ ΟΡΥΚΤΟΛΟΓΙΑΣ, ΠΕΤΡΟΛΟΓΙΑΣ, ΓΕΩΧΗΜΕΙΑΣ ΚΑΙ ΤΩΝ ΦΑΙΝΟΜΕΝΩΝ ΜΕΤΑΜΟΡΦΩΣΕΩΣ ΒΑΣΙΚΩΝ ΚΑΙ ΥΠΕΡΒΑΣΙΚΩΝ ΠΕΤΡΩΜΑΤΩΝ ΤΗΣ ΠΕΡΙΡΟΔΟΠΙΚΗΣ ΖΩΝΗΣ ΣΤΗΝ ΠΕΡΙΟΧΗ ΤΗΣ ΘΡΑΚΗΣ
… FORMED IN TWO STAGES OF DIFFERENT DEGREES OF PARTIAL MELTING OF THE HETEROGENESIS MANTLE WEDGE. THE MAGMA OF 15-20% PARTIAL MELTING, AFTER FRACTIONAL CRYSTALIZATION, DEVELOPED GABBROIC ANDVOLCANIC ROCKS, WHICH AFTER REGIONAL METAMORPHISM OF GREENSCHISTS FACIES FORMED METAGABBROS AND …
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Kinetics of chemical exchange during melting of planetary interiors
… on the kinetics of chemical exchange during partial melting within the mantles of the terrestrial planets. Chapter 1 presents experiments on the diffusion rates of La, Ce, Nd, Dy and Yb in diopside at pressures of 0 to 2.5 GPa and temperatures of 1050 to 1450 'C. The results demonstrate a …
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Impact of accessory minerals on the distribution of trace elements in the continental crust: an integrated petrologic and phase equilibria modeling study of migmatites, The
Partial melting of the lower continental crust and subsequent melt emplacement at higher structural levels is an important crustal differential process that is predicted to produce an enriched granitic upper crust and depleted, more mafic lower crust. However, the common occurrence of accessory …
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Petrology and geochemistry of the diamondiferous K-richteriteand leucite-bearing Kareevlei Kaapvaal lamproite
… a consequence of derivation by lower degrees of partial melting. In contrast, the leucite-richterite lamproites with their low La/Yb, Gd/Yb, and La/Sm ratios are indicative of derivation by greater degrees of partial melting. It is concluded that the Kareevlei lamproite varieties are generated by …
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Dynamics of Melt-mediated Crystallization of Amorphous Silicon Films
… were made regarding the pulsed-laser-induced melting-and-solidification behavior of a-Si films. In particular, it focuses on investigating the melt-mediated crystallization details that are associated with the a-Si films, which presumably do not contain preexisting microcrystal clusters (as …
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Evolution of an Archean greenstone belt in the Stormy Lake - Kawashegamuk Lake area (stratigraphy, structure and geochemistry) - Western Wabigoon Subprovince, Northwest Ontario /
… represented by mafic rocks, was derived from partial melting of upper mantle material depleted in Ti, K and the light REE ; b) a calc-alkalic suite which evolved from partial melting of amphibolite in the lower crust. The more differentiated magma types have been produced by a multistage …
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The Fraser Lakes Zone B U-Th-REE deposit and its host rocks : implications for pegmatite- and leucogranite-hosted U-Th-REE deposits in northern Saskatchewan, Canada
… pegmatites are postulated to have resulted from partial melting and incorporation of more restitic and peritectic material. Field relationships and chemical age dating of the pegmatites suggests that they formed between 1.85 to 1.80 Ga, during peak thermal metamorphism and ensuing decompression …
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The geochemistry and origin of xenoliths from the Roberts Victor Mine
… content during crystallisation, disequilibrium partial melting of garnet lherzolite and to the preservation of a diffusion gradient between two bodies of different composition. The diverse peridotite suite at Roberts Victor includes dunite, wehrlite, harzburgite, garnet harzburgite, lherzolite …
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Differentiation in impact melt sheets as a mechanism to produce evolved magmas on Mars
<p>Asteroid bombardment contributed to extensive melting and resurfacing of ancient (> 3 Ga) Mars, thereby influencing the early evolution of the Martian crust. However, information about how impact melting has altered Mars’ crustal petrology is limited. Evidence from some of the largest impact …
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Geochemistry of the Sabie River Basalt Formation in the central Lebombo, Karoo Igneous Province
… tapped and fractionated magma chambers and partial melting are examined. Granitic crustal contamination appears to have been significant only in some samples of the N group where assimilation of granitic material has proceeded in a bulk fashion described by an AFC model. RTF models are …
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Geochemistry and petrology of the Lake Vermilion Formation, Ely Greenstone Belt, northeastern Minnesota
… "Andean" type of Pearce and Norry ( 1979). Partial melting of mantle peridotite could produce the Ti-Zr-Y covariations observed in the basalts. Partial melting of amphibolite or eclogite with biotite in the residuum could produce the Ti-Zr-Y trend observed in the dacites. </p><p> The …
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Geochemical properties of the Beni Bousera (N. Morocco) peridotites : a field and laboratory approach to understanding melt infiltration and extraction in an orogenic peridotite massif
… 2 system and trace element patterns suggest partial melting of the peridotite played a significant role in the evolution of the massif, as has been previously suggested for other orogenic peridotites. Heterogeneous zones - regions throughout the massif with diverse groups of peridotites and …
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LITHIUM ENRICHMENT IN ANATECTIC PEGMATITES: NEW INSIGHTS FROM THE THERMOMETAMORPHIC AUREOLE OF THE ADAMELLO BATHOLITH
… hornfels facies conditions locally undergoing partial melting, forming Crd-bearing and Crd-absent migmatities. This small-scale migmatitic field is spatially associated with barren and Lithium-Cesium-Tanatalum (LCT) pegmatitic dykes of granitic composition, suggesting a direct link between …
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