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Showing 1 to 12 of 12 for “"white mica"”.
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White mica: spectrometer design, district-scale mapping, and integration of imaging spectrometer and lidar data
… fields, providing information regarding the chemical composition of materials measured. This information has allowed researchers to measure subtle differences in materials using ground-based, airborne, and orbital sensors. Combining imaging spectroscopy data with 3-D point cloud data produces a …
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Metamorfismo varisico dell’Unità tettonica del Monte Grighini,Sardegna centrale
… and Toccori Formation formed by quartzites, micaschists, paragneiss, phyllites, graphitic phyllites and marbles. Monte Grighini Unit has been interested by four deformation phases. The phase D1 is characterized by the blastesis of biotite and potassic white mica; this phase is almost …
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Applications of Elastic Modeling, Thermobarometry, and Thermal History Modeling to (Ultra)high-Pressure Metamorphic Rocks
… dictate many global scale tectonic and geochemical processes (i.e. orogenesis, volatile flux into the mantle, etc.), it is important to understand the depth-temperature conditions of mineral reactions during the subduction-exhumation metamorphic cycle. (Ultra)high-pressure ((U)HP) metamorphic …
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Tectonic and climatic controls on orogenic processes : the Northwest Himalaya, India
… Along the southern Himalayan front new 40Ar/39Ar white mica and apatite fission track (AFT) thermochronologic data provide the opportunity to determine the history of rock-uplift and exhumation paths along an approximately 120-km-wide NE-SW transect spanning the greater Sutlej region of the …
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Caratterizzazione geo-petrografica, petrologica e geochimica di rocce anatettiche del nord Sardegna
… for petrographic, micro-structural minero-chemical and geochemical analyses. In the Porto Ottiolu area three main deformation phases have been identified; D1, characterized by tight folds with sub-horizontal axes, rarely preserved in paragneisses; D2, that produce a pervasive foliation …
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The sedimentology, geochemistry and diagenesis of West Rand Group sediments in the Heidelberg area, Transvaal
… and metamorphism was investigated by using two white mica techniques. The chemistry of the shales was related to its mineralogy and a detailed study of the geochemical profile below the West Rand/Central Rand unconformity was undertaken. The West Rand Group east of Heidelberg is made up of a …
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Tectonic-erosion interactions : insights from the paleo-drainage of the Brahmaputra River
… eroded from the syntaxis, new rutile U-Pb, white-mica 40Ar/39Ar and zircon fission-track data, together with published data are incorporated in a thermokinematic model which suggests an older onset (>10 Ma) of rapid exhumation, and at high but not extreme rates (<5 mm/yr).
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The structural, metamorphic and thermal history of the Sonnblick Dome, southeast Tauern Window, Austria
… of the primary mineralogy and the development of mica-schists. Although this alteration is associated with syn-deformational fluid infiltration, a spatial relationship between reaction site and deformation suggests that the energy associated with deformation contributed to reactions during shear …
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Zircon Geochronology of Ash Beds in the Marcellus Shale of the Appalachian Basin
… laminated tuffaceous shale with graded beds of white mica and pyrite, ranging in thickness between 0.5 -- 14 cm. Zircon grains were extracted from 16 of the ash horizons and analyzed using the Sensitive High Resolution Ion Micro Probe Reverse Geometry (SHRIMP-RG) method.;The zircon grains …
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Sedimentpetrographische, mineralchemische und geochronologische Untersuchungen am Detritus neoproterozoischer und devonischer Siliziklastika im westlichen Südural
… rocks contrasts strongly with those of detrital white mica in the Riphean rocks. The composition of tourmalines derived from a metapsammopelitic source indicates a mainly Al-poor metasediment provenance, whereas Riphean tormalines were derived from mainly Al-rich metapsammopelites. Zircon …
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Recognising cryptic alteration surrounding the Mount Isa Copper Deposits: Implications for controls on fluid flow, and mineral exploration
… copper mineralisation at Mount Isa. Bulk geochemical techniques, such as carbon and oxygen stable isotope analysis and four-acid digest ICP-AES/MS analysis of assay pulps represent methods that can be readily applied during exploration to gain representative information about the mineralising …
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Closure of the Neotethys Ocean in Anatolia : structural, petrologic and geochronologic insights from low-grade high-pressure metasediments, Afyon Zone
… that are consistent with textural and chemical observations. Carpholite-bearing assemblages in the Afyon Zone account for a temperature increase from 280 to 380°C between 0.9 and 1.1 GPa (equivalent to a depth of 30-35 km). In order to further constrain regional geodynamics, first …