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Showing 1 to 9 of 9 for “"MAGMATIC ORIGIN"”.
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A study of millerite from Cu-Ni-PGE footwall veins, Sudbury, ON: crystal-chemistry, morphology, & geological implications
… (-NiS) is a common accessory mineral in magmatic Cu-Ni-PGE deposits, such as those occurring in Sudbury, Ontario, Canada. In such localities, millerite develops as platy crystals, often forming large, cleavable masses. This is in stark contrast to the more widespread occurrence of …
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Petrology of the Numabin Bay intrusions, Reindeer Lake, Saskatchewan
A magmatic origin of a differentiated Precambrian granitic pluton, consisting of quartz diorite, granodiorite, and quartz monzonite, is consistent with the results of petrographic and structural studies. Petrographic modal analyses and accurate plagioclase determinations by the Rittman Zone Method …
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Pyrite geochemistry across the Betze-Post deposit, northern Carlin Trend, Nevada
… of -0.8 to 4.2‰, and are consistent with a magmatic origin; however, the values also overlap with a sedimentary source. The late-ore stage pyrite delta34S signatures extend to higher values of 5.9 to 15.5‰, which suggests that the magmatic or sedimentary ore sulfur source had been …
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The Role of Fluids in Geological Processes
… role and behavior of fluids in hydrothermal and magmatic environments have been studied. Experimental studies have been carried out to determine fluid properties, in natural environments and in both synthetic and natural fluid and melt inclusions. One of these studies dealt with the effect of …
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Petrofabric investigation of the sulfide-rich basal zone of the Duluth Complex
… to magnetic lineations, confirming the magmatic origin of the magnetic fabric. X-ray computed tomography (XCT) reveals that, where silicate minerals are well-aligned, sulfides form interconnected, net-textured networks along grain boundaries, whereas in rocks with disordered textures, …
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Platinum-group element mineralisation in the Shetland ophiolite complex
… Aspects of this mineralisation suggest both magmatic and hydrothermal concentration processes, although neither individually explain the observed paragenesis. This study examines the distribution of PGE within a representative fresh vertical section of the ophiolite stratigraphy, to assess …
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Estimating the thickness of an ultrahigh-pressure (UHP) terrane: insights from phase equilibria modelling and Zr-in-rutile thermometry, Dulan area, North Qaidam terrane, China
… indicate that the eclogite´s protolith had a magmatic origin. Zr-in-rutile thermometry reveals that Dulan eclogites record peak temperatures of 647-711°C. Spatially distributed peak temperatures show an east-west temperature gradient of ~1 °C km-1 and a slow temperature increase of ~1 °C …
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Die Genese der Goldlagerstätte Hira Buddini, Südindien
… oxidizing hydrothermal fluid, which might be of magmatic origin. An increase in sulphur fugacity towards the inner proximal alteration zone is indicated by the replacement of ilmenite by pyrite and the absence of magnetite. Wall rock sulphidation is identified as the most likely cause for gold …
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ΟΡΥΚΤΟΛΟΓΙΑ, ΠΕΤΡΟΛΟΓΙΑ ΚΑΙ ΓΕΩΧΗΜΕΙΑ ΤΟΥ ΠΛΟΥΤΩΝΙΤΗ ΤΟΥ ΑΝΑΤ. ΒΑΡΝΟΥΝΤΑ (ΒΔ. ΜΑΚΕΔΟΝΙΑ)
ΜΕΛΕΤΑΤΑΙ Ο ΠΛΟΥΤΩΝΙΤΗΣ ΤΟΥ ΑΝΑΤ.ΒΑΡΝΟΥΝΤΑ (ΒΔ. ΜΑΚΕΔΟΝΙΑ) ΑΠΟ ΟΡΥΚΤΟΛΟΓΙΚΗ, ΠΕΤΡΟΛΟΓΙΚΗ ΚΑΙ ΓΕΩΧΗΜΙΚΗ ΑΠΟΨΗ. ΠΡΟΣΔΙΟΡΙΖΟΝΤΑΙ ΟΙ ΠΕΤΡΟΓΡΑΦΙΚΟΙ ΤΥΠΟΙ ΠΟΥ ΣΥΝΙΣΤΟΥΝ ΤΟΝ ΠΛΟΥΤΩΝΙΤΗ, ΟΙ ΜΕΤΑΞΥ ΤΟΥΣ ΣΧΕΣΕΙΣ ΚΑΙ ΟΙ ΣΧΕΣΕΙΣ ΜΕ ΤΑ ΠΕΡΙΒΑΛΛΟΝΤΑ ΠΕΤΡΩΜΑΤΑ. ΠΑΡΑΛΛΗΛΑ ΠΕΡΙΓΡΑΦΟΝΤΑΙ ΤΑ ΟΡΥΚΤΑ ΣΥΣΤΑΤΙΚΑ ΤΩΝ …