Penetrative Deformation of Dolostones during Contact Metamorphism and the Forceful Emplacement of the Tungstonia Granite, Kern Mountains, Nevada
| dc.contributor | Kronenberg, Andreas | |
| dc.creator | Goodson, Kyle | |
| dc.date.accessioned | 2015-02-05T20:59:12Z | |
| dc.date.accessioned | 2017-04-07T20:12:19Z | |
| dc.date.available | 2015-02-05T20:59:12Z | |
| dc.date.available | 2017-04-07T20:12:19Z | |
| dc.date.created | 2014-08 | |
| dc.date.issued | 2014-08-05 | |
| dc.description.abstract | Foliated dolostones surrounding the Tungstonia granite of eastern Nevada were investigated with the purpose of testing for models of forceful emplacement. Intragranular strains and lattice-preferred orientations (LPOs) define a zone of penetrative deformation that is narrow (<400 m) relative to the size of the Tungstonia granite (radius ~5 km) and coincident with its metamorphic contact aureole. Principle intragranular strains show shortening perpendicular to the granite-dolostone contact with maximum elongations that vary with position but are commonly parallel to the contact-parallel lineation. States of strain range from nearly pure flattening to plane strain. LPOs within ~50 m of the granite-dolostone contact exhibit c-axis maxima that are inclined to the foliation normal, indicating a sense of shear consistent with the ascent of the granite body relative to the surrounding carbonates. Penetrative deformation of dolostones is restricted to the contact metamorphic aureole with temperatures of ~300 to 710?C given by calc-silicate phase relations, calcite-dolomite geothermometry, and granite melting relations. Metamorphic constraints on peak temperatures and simple heat flow modeling suggest surprisingly short times of ~100 to 2,200 years for conductive heat exchange and pluton emplacement. Combined with constraints of temperature, pressure, strain, and grain size, strain rates near the granite-dolostone contact compare favorably with strain rates predicted by flow laws for dolomite evaluated at high strain rates in experimental studies. Penetrative deformation of dolostones closest to the granite-carbonate contact may involve a mixture of both dislocation and diffusion creep, while deformation further from the contact appears to be dominated by intracrystalline dislocation creep. | |
| dc.identifier.uri | http://hdl.handle.net/1969.1/153589 | |
| dc.language.iso | en | |
| dc.subject | natural dolomite deformation | |
| dc.subject | pluton emplacement | |
| dc.subject | magmatic diapirism | |
| dc.title | Penetrative Deformation of Dolostones during Contact Metamorphism and the Forceful Emplacement of the Tungstonia Granite, Kern Mountains, Nevada | |
| dc.type | Thesis |