Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"HORNFELS"”.
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The terminal pleistocene of Klipfonteinrand rock shelter in the Cederberg
… distant archaeological sites. Results display a hornfels-dominant lithic assemblage, with a distinctive silcrete-rich Robberg-like industry during the period 22.3 - 16.3 cal kyr BP, categorised by micro-bladelets and bipolar cores. Ostrich eggshell fragments undergo variation in thickness in …
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Metamorfismo varisico dell’Unità tettonica del Monte Grighini,Sardegna centrale
… without compositional zoning was observed in hornfels closed to the intrusive complex. Pseudosections of garnet and staurolite micaschists, garnet and sillimanite hornfels of Toccori Formation and leucogranite were calculated. P-T path of micaschists were done through garnet zoning yielding P …
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The influence of various South African aggregates on the creep of concrete
… Eastern Province Quartzitic Reef Quartzite, Hornfels, Granite and Dolerite.
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Buffalo Canyon: An Oligocene Greisen-Like Intrusion-Related Gold Deposit in the Union Mining District, Nye County, Nevada
… intrusions, are metamorphosed to biotite hornfels. Biotite hornfels is overprinted by sodic-calcic alteration that is likely related to Jurassic intrusive activity, and consists primarily of actinolite + albite in veins and disseminated patchworks. Mesothermal quartz veins have a …
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Paragenetic Evolution of the Robertson Deposit: Eocene Intrusion Related Gold Deposit in the Northern Shoshone Range, Nevada
… near the contacts of intrusions and hosted by hornfels in the overlying lithologies. Ongoing exploration has discovered significant free visible gold both within the stock and in distal settings within metasedimentary host rocks. Here, gold mineralization is spatially and temporally related to …
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A STRUCTURAL HISTORY OF THE GARNET STOCK AND ITS RELATIONSHIP TO DEFORMATION ALONG THE LEWIS AND CLARK LINE, WESTERN MONTANA
… modeling of andalusite-sillimanite bearing hornfels. Magmatic stoping led to downward shear being applied to rock of the contact aureole, creating a down-dip stretching lineation and layer-parallel boudins. Stratigraphic units thin to ~1/2 of their normal thickness within the aureole due to …
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A STRUCTURAL HISTORY OF THE GARNET STOCK AND ITS RELATIONSHIP TO DEFORMATION ALONG THE LEWIS AND CLARK LINE, WESTERN MONTANA
… modeling of andalusite-sillimanite bearing hornfels. Magmatic stoping led to downward shear being applied to rock of the contact aureole, creating a down-dip stretching lineation and layer-parallel boudins. Stratigraphic units thin to ~1/2 of their normal thickness within the aureole due to …
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Geology and petrogenesis of the Tuscarora Intrusion of the Duluth Complex, Gillis Lake 7.5’ quadrangle, northeastern Minnesota
… it contains abundant, large (>100m) basaltic hornfels inclusions. The upper zone is composed of homogenous, foliated troctolite to leucotroctolite, which grades upward from melatroctolite at the base of the zone. Inclusions in the upper zone are mostly large, often elongate blocks of …
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The use of Lethabo field 2 PFA in pavement quality concrete
… were Cape Flats Dune sand and Malmesbury shale (hornfels). The dune sand typically has very little fines content, causing severe bleeding problems in normal concrete mixes. The crushed coarse aggregate was 13 mm and flaky in shape. Ordinary Portland cement (OPC) was obtained from the De Hoek …
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Salobo Sequence, Carajas, Brazil: Geology, Geochemistry And Metamorphism
… progressive metamorphism close to pyroxene hornfels facies, followed by two episodes of hydrothermal alteration, at amphibolite and greenschist facies. The first metamorphic episode took place at low pressure (2-3 kbar) with a temperature of 750{dollar}spcirc{dollar}C (garnet-hornblende …
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Geochemistry, stable isotopes and fluid inclusion studies of the Otjikoto gold deposit, Central Namibia
… towards the foliation of the albitites and hornfels of the Oberwasser Member. The vein types include both quartz and carbonate hosted vein types. The vein mineralogy includes magnetite, pyrite and pyrrhotite which are associated with amphibole, quartz, almandine garnets, and free gold. A …
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The geology of the Tantalite Valley maficultramafic complex and the Kumkum metamorphicigneous massif near Warmbad, South West Africa, Namibia
… melts and cordierite anthophyllite/pelitic hornfels restites. Temperatures in the aureole were from 575 - 8200 c, pressure was constant at about 5,5 kb (Ptot> PH2O) and fo2 low. The proto-mottled metagabbro and proto-metagabbro then underwent thorough hydration metamorphism to metagabbros. …
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LITHIUM ENRICHMENT IN ANATECTIC PEGMATITES: NEW INSIGHTS FROM THE THERMOMETAMORPHIC AUREOLE OF THE ADAMELLO BATHOLITH
… Adamello pluton (Italy), pelites reached 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 …
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Ο ΠΛΟΥΤΩΝΙΤΗΣ ΤΗΣ ΜΑΡΩΝΕΙΑΣ ΚΑΙ Η ΜΕΤΑΜΟΡΦΙΚΗ ΤΟΥ ΕΠΙΔΡΑΣΗ ΣΤΑ ΠΕΡΙΒΑΛΛΟΝΤΑ ΠΕΤΡΩΜΑΤΑ ΤΗΣ ΦΥΛΛΙΤΙΚΗΣ ΣΕΙΡΑΣ
THE MARONIA PLUTON HAS A COMPOSITION RANGING FROM MONZODIORITE TO MONZO-GABBRO.THE MONZO-GABBRO COMPOSITION IS DOMINANT. THE PLUTON BELONGS TO THE CALC-ALCALINE ROCK SERIES AND FROM A PETROGENETIC ASPECT IT IS CHARACTERIZED AS AN IGNEOUS ROCK BELONGING TO THE I-TYPE OR MAGNETITE SERIES (M ORIGIN). …