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oai:mountainscholar.org:10217/883452025-12-30T03:43:23Zcom_10217_100532com_10217_100000com_10217_100434com_10217_100303col_10217_100536col_10217_100446

Edwards, Jeffrey Scott, author McCallum, M. E. (Malcolm E.), 1934-, advisor Burns, L. K., committee member Warren, C. Gerry, committee member Medicine Bow Mountains (Colo. and Wyo.) Colorado Wyoming 2007-01-03T05:56:13Z 2007-01-03T05:56:13Z 1983 1983_spring_Edwards_GEOS.pdf 1983_spring_Edwards_GEOS_suppl.pdf ETDF1983100001GEOS http://hdl.handle.net/10217/88345 https://doi.org/10.25675/3.024717 Zip file contains supplementary plates 1 and 2. Geologic mapping and thin section petrography of rock units in and adjacent to the southwestern portion of the Mullen Creek mafic complex reveals the presence of a roof zone of a Precambrian layered basic intrusion that invaded a metavolcanic sequence (predominantly hornblende gneiss). This portion of the mafic complex consists of variably metamorphosed interlayered rocks that originally ranged from pyroxenite to anorthosite but were dominantly gabbro and leucogabbro. Most of these rocks underwent regional medium-grade metamorphism to form amphibolite facies assemblages in which hornblende has replaced pyroxene, labradorite has remained stable and relict igneous textures are preserved. A later episode of retrogressive low-grade metamorphism has produced locally abundant fractures, veinlets and minerals typical of the greenschist facies such as chlorite, epidote, talc, serpentine and saussurite. masters theses ZIP PDF English eng Colorado State University. Libraries Catalog record number (MMS ID): 991004697369703361 QE445.W8.E38 1983 1980-1999 Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. southern Wyoming Medicine Bow Mountains Prospect Mountain granite Big Creek shear zone layered mafic intrusion Mullen Creek-Nash Fork shear zone Mullen Creek mafic complex northern Colorado hornblende gneiss Petrology -- Medicine Bow Mountains (Colo. and Wyo.) Petrology and contact relationships, SW portion PC Mullen Creek mafic complex, Medicine Bow Mts., Wy. Text Master of Science (M.S.) Masters Earth Resources Colorado State University This Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). open.access