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Showing 1 to 20 of 20 for “"Petrology and geochemistry"”.
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Petrology and geochemistry of the Killdeer carbonates
… sequence of tuffaceous, calcareous, dolomitized and silicified flat lying sedimentary rocks of Tertiary age. It is the purpose of this report to describe and integrate the petrology and geochemistry of these sediments.</p> <p>Fieldwork was conducted during the summer of 1972. Forty-three …
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Petrology and geochemistry of high degree mantle melts
Experimental phase equilibria, whole rock major and trace element concentrations, and mineral major and trace element concentrations are used to constrain the petrogenesis of high degree, hydrous melts of the mantle, with particular focus on komatiites from the Barberton Mountainland, South Africa. …
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Petrology and geochemistry of granitic rocks : Cape Ann, Massachusetts,
… Institute of Technology, Dept. of Earth and Planetary Science, 1972.
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Petrology and geochemistry of the granitoids of the Halfway House Dome
… between present-day plate tectonic processes and geotectonic processes active during Archaean times has led to re-evaluations of important Archaean terrains world-wide in the light of growing support for the notion that plate tectonic processes were active in the Archaean. Archaean cratons are …
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Petrology and geochemistry of syenite intrusions in the Eastern Province of Zambia
… by both oversaturated quartz bearing types and undersaturated nepholine-sodalite varieties.The ,Sinda syenite intrusions are oversaturated potassics which form a petrogenetically related N-S trending string of intrusions at the eastern margin of the Sinda batholith.The northernmost Lusandwa …
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Petrology and geochemistry of pyroxenites in the Lanzo ultramafic massif, Northwestern Italy
Combined field, microtextural, and geochemical observations are presented for pyroxenites in the Lanzo ultramafic massif in order to place chemical and petrological constraints both locally on the geologic history of the massif and more generally on the role of magmatic rifting and the …
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Petrology and geochemistry of intra-back arc basalts from the Argentine Andes
… of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
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Geology, petrology and geochemistry of Traveler Rhyolite and Katahdin Pluton (northcentral Maine)
… Institute of Technology, Dept. of Earth and Planetary Sciences, 1976.
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The petrology and geochemistry of Precaldera Magmas, Long Valley Caldera, Eastern California
… M.a. produced a basalt -trachybasalt -trachyandesite -quartz latite suite peripheral to the present Long Valley caldera from a heterogeneous, interactive, deep crustal magmatic -system. The suite consists of ( 1) widespread, predominately porphyritic olivine-augite basalt / trachybasalt / …
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Petrology and geochemistry of the diamondiferous K-richteriteand leucite-bearing Kareevlei Kaapvaal lamproite
… be non-diamondiferous or at least sub-economic and as a result, their petrogenesis has remained poorly constrained as the exploration programs focused mainly on the unevolved subvarieties of Kaapvaal lamproites, such as at the Finsch mine. To further assist with the petrogenesis of these …
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Petrology and geochemistry of precious and base metal mineralization, North Amethyst vein system Mineral County, Colorado
Gold, silver and base metal-rich minerals of the North Amethyst vein occupy fractures in 26 Ma volcanic rocks near the southern margin of the San Luis caldera, at the northern edge of the Creede district, San Juan Mountains, Colorado. The veins contain two associations of mineral assemblages that …
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The petrology and geochemistry of the minor intrusions in the central metasedimentary belt, Grenville Province, southern Ontario, Canada.
… Belt. A supracrustal sequence of carbonates and clastic metasediments, interdigitating with metavolcanics occur in this area, intruded by a series of dykes. The majority of minor intrusions are mafic in composition; a minor number of felsic samples have been identified. The dykes have been …
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Petrology and geochemistry of the recent eruption history at Rabaul Caldera, Papua New Guinea : implications for magmatic processes and recurring volcanic activity
… Caldera occurred with synchronous vulcanian and vulcanian-plinian eruptions from Tavurvur and Vulcan, respectively, on opposing sides of the caldera. A second phase of activity (Phase 2), beginning on 28 November 1995 and continuing until the present (2003), is characterised by intermittent …
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Petrology and geochemistry of the recent eruption history at Rabaul Caldera, Papua New Guinea : implications for magmatic processes and recurring volcanic activity
… Caldera occurred with synchronous vulcanian and vulcanian-plinian eruptions from Tavurvur and Vulcan, respectively, on opposing sides of the caldera. A second phase of activity (Phase 2), beginning on 28 November 1995 and continuing until the present (2003), is characterised by intermittent …
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THE PETROLOGY AND GEOCHEMISTRY OF HIGH CASCADE VOLCANICS IN SOUTHERN WASHINGTON: MOUNT ST. HELENS VOLCANO AND THE INDIAN HEAVEN BASALT FIELD (TRACE ELEMENT, ISOTOPES, MINERALOGY)
… spectrum of rock types including basaltic to andesitic lavas, andesitic to dacitic pyroclastic flows and tephra, and dacite domes. The major and trace element compositions of some andesites and dacites are broadly consistent with their derivation from a basaltic andesite parental magma by …
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An Outcrop Based Study of the Weches Formation in Sabine County, Texas: Investigating Its Unconventional Resource Potential through the Study of Stratigraphy, Sedimentology, Petrology, and Geochemistry
… in Sabine County, Texas, were sampled, measured, and logged with gamma-ray spectrometry (GRS). Sedimentology and petrology characteristics of Weches samples were analyzed through thin section, scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction, and GRS Th/K ratios …
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Petrology and geochemistry of Sangeang Api and recent volcanism in the Sumbawa-Flores sector of the Sunda Arc: the response of along-arc geochemistry to subduction processes.
… data from an active volcano (Sangeang Api) and previously unstudied, extinct volcanoes (Wai Sano and Doro Kota and Doro Kuta) from adjacent sectors of the eastern Sunda Arc, Indonesia. Sangeang Api erupts co-magmatic suites of lavas and cumulate xenoliths. Lavas are ne-normative, …
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Petrological and geochemical studies of an abyssal periodotite from the Atlantis II fracture zone
This thesis investigates the petrology and geochemistry of an abyssal peridotite dredged from the Atlantis II Fracture Zone in the southwestern Indian Ocean Ridge. Texturally, this sample is a serpentinized peridotite with a crosscutting coarse-grained clinopyroxenite vein. One of the alteration …