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Showing 1 to 20 of 58 for “"GRANODIORITE"”.
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Petrogenesis of the Springfield Granodiorite, southeast Pennsylvania Piedmont
The Springfield pluton intrudes the Wissahickon schist in the southeast Pennsylvania Piedmont. The mineralogy of the pluton. in order of decreasing abundance is plagioclase, quartz, microcline, biotite, epidote (often with allanite cores) and trace amounts of hornblende. Accessory minerals include …
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Petrogenesis of the Spruce Pine pegmatites, North Carolina
… from differentiation of a magma. There are eight granodiorite plutons in the Spruce Pine area ranging in size from 1 to 20 square kilometers that contain and are surrounded by hundreds of pegmatites. The granodiorite and the pegmatites are mineralogically and chemically identical, indicating that …
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A contribution to the study of older granites in the Nigerian Precambrian with special reference to the Tegina granite
… The Main granite, a porphyritic biotite granite. Granodiorite and quartz-diorite in it represent local or marginal contamination. (2) Similar rocks are developed in the zone of banded foliation. In addition, there are remnant bands of granodiorite providing evidence that the 'granite' was formed …
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Petrography of xenolith zones in the Black Face-Ames plutons, western San Juan Mountains, Colorado
… The principal rock type within the plutons is granodiorite porphyry, although part of the Ames pluton consists of porphyritic rhyodacite.</p> <p>Two major zones of xenoliths of Precambrian rock occur within the Black Face-Ames plutons; scattered xenoliths are found at widely separated …
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Petrology and geochemistry of the granitoids of the Halfway House Dome
… i.e. greenstone belts, tonalite-trondhjemite-granodiorite (termed “TTG suite”) and gneisses and calc-alkaline K-rich granitoids. The latter is often referred to as granodioritic-granitic-monzogranitic (GGM). Archaean TTG associations are the main components of the Archaean continental crust …
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The evolution of the Baie Verte Lineament, Burlington Peninsula, Newfoundland
… and tonalite. A large, generally unfoliated, granodiorite (Burlington Granodiorite) borders the eastern side of the Lineament. Outside the map area, it is seen to be either a pre- or early syn-kinematic intrusion into Fleur de Lys schists. The Baie Verte Lineament consists, in the mapped area, …
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The Xenolithic suite of the Strontian Granite
… rocks. It is composed of an outer tonalitic granodiorite (dated at 435 Ma.) passing into a porphyritic granodioritic, both xenolithic, and intruded by a younger alkali granite (ca. 400 Ma.).
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Petrogenesis of the Moosehorn igneous complex, Maine
… from olivine norite through quartz diorite and granodiorite. Partially crystallized mafic magmas are often intruded by slightly peraluminous biotite ± hornblende granites as demonstrated by the occurrence of a wide range of enclave-host relationships. The igneous complexes are commonly cut by …
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The geochemistry of carbonate-hosted Pb-Zn-Ag mineralization in the Lavrion District, Attica, Greece: fluid inclusion, stable isotope, and rare earth element studies
… Greece, are spatially related to a 7 to 10 Ma granodiorite intrusion and various sills and dikes of mafic to acid composition. The Plaka granodiorite contains porphyry molybdenite mineralization and is spatially associated with a Cu-Fe skarn. Carbonate-replacement deposits occur predominantly …
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Geology of the Peaks of Otter area, Bedford and Botetourt counties, Virginia
… mainly metasedimentary. The Pedlar Hypersthene Granodiorite is considered the youngest tonnation and consists chiefly of hypersthene granodiorite of igneous origin but includes rock types near its contacts which are probably hybrid varieties. The formations crop out in parallel, …
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The Construction of a Plutonic Complex in a Continental Arc Setting: The Skookum Butte Stock, Western Montana
… and is dominated by biotite-muscovite granite/granodiorite and biotite-hornblende granite/granodiorite, to subordinate quartz monzodiorite, and monzogabbro. Both field evidence and geochemical data indicate that SBS magmas were generated from at least two distinct sources: a primitive source of …
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The Construction of a Plutonic Complex in a Continental Arc Setting: The Skookum Butte Stock, Western Montana
… and is dominated by biotite-muscovite granite/granodiorite and biotite-hornblende granite/granodiorite, to subordinate quartz monzodiorite, and monzogabbro. Both field evidence and geochemical data indicate that SBS magmas were generated from at least two distinct sources: a primitive source of …
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A study of the Pine Portage Gold Prespect, Kenora district, Ontario
… types present in the study area: amphibolite, granodiorite, and vein material. The amphibolite is composed of amphibole, plagioclase, chlorite, and clinozoisite. The granodiorite is composed of plagioclase, alkali feldspar, quartz, biotite, and epidote. The vein material is predominantly …
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ΠΕΤΡΟΛΟΓΙΑ ΚΑΙ ΓΕΩΧΗΜΕΙΑ ΤΟΥ ΠΛΟΥΤΩΝΙΤΗ ΤΗΣ ΕΛΑΤΙΑΣ (ΚΕΝΤΡΙΚΗ ΡΟΔΟΠΗ)
… IT CONSISTS MAINLY OF MEDIUM TO CARSE GRAINED GRANODIORITE WHICH IN THE CENTRAL-WEST PART BECOMES PORPHYRITIC WITHLARGE MEGACRYSTS OF K-FELDSPAR. LESS ABUNDANT IS THE GRANITE WHICH IN THE FORMOF SMALL FINE TO MEDIUM GRAINED INTRUSIONS CUTS THE GRANODIORITE. THE MAIN ROCK-FORMING CONSTITUENTS …
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Geology of the Piney River-Roseland titanium area, Nelson and Amherst counties, Virginia
… granitic gneiss, feldspathic gneiss, hypersthene granodiorite, pegmatitic anorthosite, and nelsonite. The pegmatitic anorthosite occurs as sills and dike-like bodies. It originally consisted of coarse-grained, antiperthitic plagioclase (An₃₀). Most of the primary textures in this rock have been …
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Temperature-dependent thermal transport properties of major Archean rock types and implications for the thermal evolution of Archean terranes
… of high heat-producing tonalite-trondhjemite-granodiorite (TTG), and the burial of TTG rocks below GG rocks is believed to have triggered dome-and-keel formation. The thermal transport properties of these rocks, thermal diffusivity (D), and thermal conductivity (k), are not well constrained, …
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Mineralization and Wall Rock Alteration Flin Flon area, Saskatchewan
… high temperatures and is related in age to the granodiorite or the Kaminis granite. The type of wall rock alteration accompanying the mineralisation depends on the nature of the hydrothermal solutions and on physical conditions, such as temperature and pressure.
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The geological evolution of the eastern Richtersveld
… distinguished. The oldest phase, a fine-grained granodiorite, is only tentatively assigned to the Vioolsdrif Intrusive Suite and probably constitutes a subvolcanic member of intermediate metavolcanics of the Kookrivier Formation. It was followed by syntectonic even-grained granodiorite and by …
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Pre-Grenville ages of basement rocks in central Virginia: a model for the interpretation of zircon ages
… occurred at least 913 m.y. ago. The Rockfish granodiorite, in Nelson County, Virginia, intruded these older basement rocks 820 ± 20 m.y. ago and appears to be coeval with the extensive Catoctin and Mt. Rodgers volcanic rocks. Because of the complex geologic history of this area, two models are …
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The geology of the area east of Pofadder with emphasis on shearing associated with the Pofadder lineament, North West Cape
… Syn to post-tectonic intrusive rocks include a granodiorite-tonalite suite, diorite, pegmatite and vein quartz. Dolerite is post-tectonic, most likely of Karoo age and occurs as sills and remnant hillocks. Non-diamondiferous kirnberlite pipes occur in the west and their emplacement appears to …
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