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Showing 1 to 20 of 103 for “"pluton"”.
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Petrology of the Gracefield pluton.
The Gracefield pluton is composed of two distinct syenite intrusions; both of which appear to have been intruded late in the Grenville tectonic and metamorphic history. They both exhibit a well developed concentric mineralogical zoning. They have shonkinitic cores which grade laterally into alkali …
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Deformation in the striped rock pluton, southwest Virginia
The Striped Rock pluton of the late-Proterozoic Crossnore Plutonic-Volcanic suite is located beneath the Fries Thrust zone in the Blue Ridge province of southwest Virginia. The multiphase granite pluton has been affected by episodes of brittle and crystal plastic deformation at both the microscopic …
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Petrology of the Tunk Lake Granite Pluton, Southeastern Maine
Made available in DSpace on 2014-12-04T19:14:23Z (GMT). No. of bitstreams: 1 6305107.pdf: 5196353 bytes, checksum: 74c93a828545363530e113623bb1603f (MD5) Previous issue date: 1963
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Contact metamorphism of the Lucerne pluton, Hancock Co., Maine
The Lucerne pluton intrudes rocks of the Penobscot formation Ordovician-Silurian (?)), a quartz-rich sulfidic pelite that contains muscovite, biotite, cordierite, andalusite, plagioclase, pyrrhotite and graphite outside the thermal aureole; and the Bucksport formation (=Vassalboro, Silvian-Devonian …
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Petrogenesis of the reversely zoned Turtle pluton, Southeastern California
Few plutons with a reversed geometry of a felsic rim and mafic core have been described in the geologic literature. The Turtle pluton of S.E. California is an intrusion composed of a granitic rim and granodioritic core and common microgranitoid enclaves. Field observations, mineral textures, and …
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Trend-Surface Analysis of the Trunk Lake Granitic Pluton, Maine
… modal analysis of the Tunk Lake granitic pluton was performed using a program for the IBM 30/40 computer (Appendix 1) by Heiner and Geller (MIRL Report No. 9) and data from Karner (1968). The quartz, total mafics, oligoclase, perthite, and albite in perthite percentages were analyzed. …
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The origin of the Wilson Ridge pluton and its enclaves, northwestern Arizona: Implications for the generation of a calc-alkaline intermediate pluton in an extensional environment
The Wilson Ridge pluton is an epizonal calc-alkaline pluton that formed about 13.5 Ma during a period of mid-Miocene extension. The pluton was passively emplaced into a 1.7 to 1.8 Ga Precambrian crystalline terrain. High-angle normal faulting resulted in a series of horsts and grabens that provide …
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The Geology And Geochemistry Of The Archean Flavrian Pluton, Noranda, Quebec
The composite Flavrian pluton is the west part of an intrusive complex which is emplaced in and is partially coeval with Blake River Group volcanic rocks in Noranda. The pluton's intrusive sequence is summarized as follows: an extensive diorite sill, volumetrically minor porphyritic rhyolite, the …
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Sodium metasomatism and magnesio-riebeckite mineralization in the Wilson Ridge pluton
The Wilson Ridge pluton contains a rare occurrence of hydrothermal sodic amphibole. hydrothermal amphibole occurs as fracture coatings, veinlets, dense stockwork-type networks, and diffusive alteration fronts. Electron microprobe analyses of the hydrothermal amphibole reveal a range of Na-rich …
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Structure and Petrology of the North Sullivan Pluton, Hancock County, Maine
Made available in DSpace on 2014-12-11T18:09:57Z (GMT). No. of bitstreams: 1 7212062.pdf: 3773754 bytes, checksum: 5f66ef7c66ddce8a453dd2fe97dccaba (MD5) Previous issue date: 1971
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Phase relations in the contact aureole of the Onawa Pluton, Maine
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1960.
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Geology, petrology and geochemistry of Traveler Rhyolite and Katahdin Pluton (northcentral Maine)
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1976.
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Petrology of the Rapakivi Granite of the Great Wass Pluton, Washington County, Maine
Made available in DSpace on 2014-12-11T18:09:59Z (GMT). No. of bitstreams: 1 7219952.pdf: 16361862 bytes, checksum: e544fdc808abd4ab24979a0d7234d17b (MD5) Previous issue date: 1972
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Garnetites of the Cardigan Pluton - Evidence for Restite and Implications for Source Rock Compositions.
The Cardigan pluton, located in the southern half of New Hampshire, is a strongly peraluminous, S-type granite which is granodioritic in composition. It is inferred to have been emplaced rapidly, thrust up along west-verging nappes during the Acadian orogeny. Distinctive pods, consisting of 50 to …
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Investigation of iron isotope variability in the bimodal Aztec Wash Pluton, Eldorado Mountains, Nevada
… of the past decade, our understanding of silicic plutons has undergone a fundamental shift, from envisioning pluton emplacement as one large magmatic intrusion to the concept of incremental emplacement, in which plutons form from multiple smaller injections of magma over hundreds of thousands to …
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Strain path partitioning during forceful emplacement of the Papoose Flat pluton, Inyo Mountains, CA
… be traced into the aureole of the Papoose Flat pluton where, due to intense crystal-plastic deformation, they are thinned to less than 10% of their original stratigraphic thickness. This deformation is constrained by textural relationships to have occurred during contact metamorphism. The strain …
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Age and petrogenesis of the Striped Rock granite pluton: Blue Ridge province, southwestern Virginia
The Striped Rock granite pluton is an epizonal A-type intrusion emplaced into Grenville age gneisses at 748 Ma. Isotopic, petrographic, and textural evidence indicate that the facies comprising this pluton are differentiates of a homogeneous magrna and not the result of multiple intrusions. …
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Investigation of Aztec Wash pluton using 87sr/86sr as a tool to understand mushzone differentiation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Argon diffusion gradients in micas and implications for the thermal history of the Sandia pluton
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
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