Stress distribution in the Winters Pass thrust plate

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dc.contributor.advisorBurchfiel, B. C.en_US
dc.creatorLambert, William R.en_US
dc.date.accessioned2018-12-18T21:16:24Zen_US
dc.date.available2018-12-18T21:16:24Zen_US
dc.date.issued1978en_US
dc.description.abstractThe Winters Pass thrust plate carries a section of Precambrian basement and its sedimentary cover rocks over Precambrian and lower Paleozoic sedimentary rocks. The thrust plate has undergone two periods of movement: the first to the southeast, and the second to the northeast. The basal 3 to 4 meters of this thrust plate consists of basement rocks that are cataclastically deformed, locally blastomylonitic and contain a well-developed cataclastic foliation and mineral lineation due to feldspar and quartz streaking. In the higher parts of the thrust plate, the cataclastic rocks present in the basement are mylonitic gneisses and mylonites. Relatively undeformed gneisses are present above the mylonites and throughout the thrust plate interspersed with cataclastic rocks. Closely spaced shear fractures are present throughout the gneiss. However, they are not well-developed in the blastomylonites in the lower parts of the thrust or in the upper part where they become progressively less well developed. The shear fractures are also absent in areas of massive quartzo-feldspathic rocks. Microshear fractures, however, are found in all thin sections studied throughout the plate. Stress distribution was determined by using conjugate shear fractures present both in the field and in thin-section. The earliest stress field had with a NWSE subhorizontal orientation and varying in orientation between northeast plunging 55 degrees and southwest plunging 4 degrees. The second stress field had a subhorizontal NE-SW orientation for o oriented in a southeastern direction with plunges varying between 4 and 9 degrees. These two different stress distributions indicate two separate thrusting events. Overturned folds in the area agree with this interpretation and also give direction of movement. These folds indicate the first movement of the Winters Pass thrust plate was to the southeast and the second movement was to the northeast.en_US
dc.format.digitalOriginreformatted digitalen_US
dc.format.extent103 ppen_US
dc.identifier.callnoThesis Geol. 1978 Lamberten_US
dc.identifier.citationLambert, William R.. "Stress distribution in the Winters Pass thrust plate." (1978) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/104027">https://hdl.handle.net/1911/104027</a>.en_US
dc.identifier.digitalRICE1653en_US
dc.identifier.urihttps://hdl.handle.net/1911/104027en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.titleStress distribution in the Winters Pass thrust plateen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentEarth Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Artsen_US
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