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Showing 1 to 20 of 273 for “"Mafic"”.
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Livadi Mafic-Ultramafic Complex and its metamorphic basement, N.E. Greece
… the present tectonic juxtaposition of the Livadi Mafic - Ultramafic Complex and the metamorphic lithologies of the Pelagonian basement, results from an involved history of deformation and metamorphism. The Pelagonian basement comprises a sequence of psammitic and pelitic clastics, frequently of …
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Deformation Mechanisms and Strain Localization in the Mafic Continental Lower Crust
… weakening and strain localization occurs in the mafic continental lower crust. Mafic granulites are analysed from two unrelated continental lower crustal shear zones which share comparable mineralogical assemblages and high-grade deformation conditions (T > 700 °C and P > 6 Kbar): the Seiland …
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Geochemistry of peridotites and associated mafic rocks, Ronda ultramafic complex, Spain.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Science.
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Towards using seismic anisotropy to interpret ductile deformation in mafic lower crust
… seismic profiles, indicates the importance of mafic lithologies. The Laxfordian-age high-grade shear zone at Upper Badcall, NW Scotland, exhibits a strain gradient in a deformed doleritic Scourie dyke (Lewisian complex) that intersects the zone at a high angle. From an analysis of field data …
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Petrogenesis of the McClure Mountain mafic-ultramafic and alkalic complex, Fremont County Colorado
Call number: LD2668 .T4 1978 K53
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Petrogenetic study of the Porcupine Lake mafic intrusive complex, Trinity terrane, northern California
The Early Devonian (404 +/- 3 Ma) Porcupine Lake mafic intrusive complex of the Trinity terrane consists primarily of ultramafic-mafic plutonic and dike lithologies. The plutonic rock forms steep intrusive contacts with adjacent Ordovician peridotite, and consists of basal layered peridotite, …
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Mafic volcanism in the Colorado Plateau/Basin-and-Range Transition Zone, Hurricane, Utah
… is a small-volume (0.48 km{dollar}\sp3{dollar}) mafic volcanic field in the Colorado Plateau/Basin & Range Transition Zone located in the eastern part of the St. George basin in southwestern Utah. Strombolian-Hawaiian style eruptions produced thin (10 m) a'a lava flows and cinder (scoria) cones …
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Mafic magmatism in the Eastern Cordillera and Putumayo Basin, Colombia : causes and consequences
… restricted occurrences of dykes and sills of mafic composition presumably emplaced in the Cretaceous and of volcanic rocks of Neogene age. This work is focused on the study of the Cretaceous magmatism with the intention to understand the processes causing the genesis of these rocks and their …
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Petrology and contact relationships, SW portion PC Mullen Creek mafic complex, Medicine Bow Mts., Wy.
… to the southwestern portion of the Mullen Creek mafic complex reveals the presence of a roof zone of a Precambrian layered basic intrusion that invaded a metavolcanic sequence (predominantly hornblende gneiss). This portion of the mafic complex consists of variably metamorphosed interlayered …
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UNDERSTANDING ERUPTIVE DYNAMICS, PLUME DISPERSAL AND PARTICLE TRANSPORT FOR RISK ASSESSMENT IN PAROXYSMAL MAFIC ERUPTIONS
Paroxysmal activity at open vent volcanoes is a significant source of hazard as it occurs with limited and short-term precursory activity and has a severe impact both on proximal and distal regions because of tephra fallout and ash dispersion. Characterization of eruptive dynamics is therefore …
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Petrologic and Thermodynamic Investigation of the Aqueous Transport of Platinum-Group Elements During Alteration of Mafic Instrusive Rocks
… aqueous solutions and alteration of mafic intrusive rocks. Investigation of two drillcores (FHL-1 and FHL-2) from the basal zone of the southern Duluth Complex indicates multiple overprintings of hydrothermal alteration within these rocks. Primary mafic igneous silicates are replaced …
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A metamorphic and geochemical study of mafic rocks across the Pencksökket-Jutulstraumen Discontinuity, western Dronning Maud Land, East Antarctica
A petrological and metamorphic comparison of Mesoproterozoic metabasic rocks on the easern margin of the Archaean Grunehogna Craton and the adjacent Maud Belt in western Dronning Maud Land, East Antarctica, revealed a difference in peak metamorphic conditions from T = ~275° to 730°C and P=2 to 10.7 …
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Geochemistry of mafic dikes from the Coastal New England magmatic province in southeast Maine, USA and Nova Scotia, Canada
Mid-Late Triassic-age alkali-basalt dikes were emplaced along the coast of New England between 240-200 Ma. Known as the Coastal New England (CNE) magmatic province, this dike swarm is the immediate magmatic predecessor to the formation of the Central Atlantic Magmatic Province large igneous …
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Geology, Petrology, and Tectonic Setting of the Mafic Rocks of the 1480 MA Old Granite-Rhyolite Terrane of Missouri, USA
Igneous and metamorphic mafic rocks form a volumetrically subordinate component of the 1480 Ma old granite-rhyolite terrane of Missouri. The igneous rocks are present in the St. Francois Mountains and a drillcore from Shannon county and can be subdivided into two groups. The Silver Mines Mafic …
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The origin and tectonic significance of the mafic-ultramafic association in the central Virginia Blue Ridge post-Grenville cover sequence
The question of whether the mafic and ultramafic rocks of the central Virginia Blue Ridge are part of a Late Proterozoic to Ordovician ophiolite-bearing sequence or part of an intrusive-extrusive sequence related to the Late Proterozoic Iapetan rifting has major implications for Appalachian …
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