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Showing 1 to 20 of 20 for “"MAGMATIC EVOLUTION"”.
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Magmatic evolution of the southern Centinela district, northern Chile: insights from PGE geochemistry and zircon fertility tools
… deposits share a similar source and that the magmatic activity continued for ca. 5-6 Myr., shifting into more oxidizing conditions as it evolved. Platinum group elements geochemistry show contrasting results between the two deposits: Penacho Blanco deposit shows a steady decrease in Pd and Pt, …
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Magmatic evolution of the southern Centinela district, northern Chile: insights from PGE geochemistry and zircon fertility tools
… deposits share a similar source and that the magmatic activity continued for ca. 5-6 Myr., shifting into more oxidizing conditions as it evolved. Platinum group elements geochemistry show contrasting results between the two deposits: Penacho Blanco deposit shows a steady decrease in Pd and Pt, …
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Documenting Magnatic Processes at Filicudi Island, Aeolian Arc, Italy: Integrating Quantitative Modeling and Plagioclase Textural and in situ Compositional Data
… and relative chronology that RAFC played in the magmatic evolution and elucidates aspects of the magma plumbing system structure.</p> <p>Results indicate a polybaric magma plumbing system with deeper (3.5-4 kilobars) and shallower (0.5-1.2 kilobars) storage regions. Within the deeper system, FC …
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Geochemical Constraints of Porphyry Cu Deposits-Forming Magmas in Sonora, Mexico
… 2010). PCD formation is intimately linked to the magmatic and tectonic evolution of convergent margins (Sillitoe, 2010). While the metallogenic characteristics of PCDs have been well-studied, the petrological and geochemical processes that govern magma fertility, essential prerequisites for PCD …
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Seismic constraints on the processes and consequences of secondary igneous evolution of Pacific oceanic lithosphere
… to better understand the processes of secondary magmatic evolution of the lithosphere, which can have global-scale implications for oceanic and atmospheric chemistry. In the western Pacific, widespread Cretaceous magmatism has modified oceanic lithosphere over hundreds of millions of square …
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Seismic constraints on the processes and consequences of secondary igneous evolution of Pacific oceanic lithosphere
… to better understand the processes of secondary magmatic evolution of the lithosphere, which can have global-scale implications for oceanic and atmospheric chemistry. In the western Pacific, widespread Cretaceous magmatism has modified oceanic lithosphere over hundreds of millions of square …
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Origin and evolution of parental magmas associated with Pliocene-Quaternary low-silica volcanism within the Altiplano-Puna Volcanic Complex of northern Chile
… these magmas therefore assist in assessing the evolution of the APMB through space and time. Additionally, individual volcanoes demonstrate that contamination of parental melts was caused by different differentiation processes (e.g. magma mixing, fractional crystallization, crustal assimilation) …
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Auswirkungen der hydrothermalen Alteration und der Metamiktisierung auf die U-Th-Pb-Verteilung und die U-Pb-Isotopensystematik in Pyrochlor des Sokli Karbonatit-Komplex, N-Finnland
… range observerd for other complexes in KAP. The magmatic core was build up in three phases, two magmatic phases separated by a hydrothermal phase.Pyrochlore crystals of the Sokli carbonatite complex show a large chemical variation over the evolution of the magmatic stages, as well as in small …
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The controls of radioelement distribution in the Etive and Cairngorm granites: Implications for heat production
… Scotland. These studies throw light on the magmatic history of the intrusions and. more particularly. on their radioelement geochemistry and heat production which is interpreted in a geothermal context. <br></br><br></br>The Etive Complex is a multiphase intrusion, ranging from diorite to …
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Petrology of the Sutherland Commonage melilitite intrusives
… exhibit complex zonation patterns. They record magmatic conditions ranging from the intrusive stage to a final phase of magmatic evolution during which a vapour phase evolved after the majority of the groundmass minerals had crystallised. The chemistry of olivine phenocrysts suggests that the …
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Cenozoic potassic magmatism and uplift of the Western United States
The geochemistry and temporal evolution of small volume potassium-rich mafic volcanics within the non-extensional, uplifted central Colorado Plateau and Sierra Nevada have been studied in detail and a general model is proposed for non-extensional, uplift-related, magmatism within the Western …
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An experimental and petrologic investigation of the source regions of lunar magmatism in the context of the primordial differentiation of the Moon
… at very different points in the thermal and magmatic evolution of the Moon.
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Deciphering the Signature of Magma Mixing: Examples from the Castle Creek Eruptive Period, Mount St. Helens, Washington
… were also executed to model major element evolution during the Castle Creek eruptive period.</p> <p>MELTS simulations reveal primitive Cave basalt can be related to most Precave basalts, andesite and dacite compositions of Castle Creek age through isobaric fractional crystallization. …
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Volcanostratigraphy using geophysical methods on La Fossa di Vulcano (S-Italy)
… show clearly that a higher degree of magma evolution correlates with lower susceptibility and higher gamma-ray values. Variations of the values can be observed not only by the change of the degree of magmatic evolution but also by the inhomogeneous deposition conditions. Particularly the …
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The architecture, growth and tectono-stratigraphic significance of rift-oblique lineaments on the NE Atlantic Margin
… and impact directly upon the stratigraphic and magmatic evolution of a basin. The NE Atlantic Margin is a volcanic passive margin which has undergone a series of rift events culminating with continental breakup in the Early Cenozoic. From potential field, seismic reflection, seismic refraction …
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Geophysical investigations in the English Lake District
… image processing, in order to study the form and evolution of the Lake District granite batholith and structures within the Skiddaw and Borrowdale Volcanic groups. <br></br><br></br>The modelling studies indicate that Lake District batholith may comprise up to nine separate deep-seated components, …
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The Structural Evolution of the Faroe Islands, NE Atlantic Margin
… this study, the Palaeogene and later structural evolution of the NE Atlantic margin is investigated using abundant field data collected on the Faroe Islands, and systematic observations that characterise the related deformation structures developed in the Faroe Islands Basalt Group (FIBG). …
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Magmatic volatiles at rifts and arcs: Sources and fractionation effects
… focus on volatiles and the origin of carbon-rich magmatic emissions in the East African Rift, which is perhaps the least understood tectonic system on Earth in terms of mantle degassing. East Africa hosts a diverse array of enigmatic magma compositions, best exemplified by Oldoinyo Lengai volcano …
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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 …