2026-09-20T00:28:22Zhttps://dspace.mit.edu/server/oai/request

oai:dspace.mit.edu:1721.1/551682022-01-13T07:54:24Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023

Oliver Jagoutz. Stanley, Jessica R Massachusetts Institute of Technology. Dept. of Earth, Atmospheric, and Planetary Sciences. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences f-mr--- 2010-05-25T20:56:55Z 2010-05-25T20:56:55Z 2009 2009 http://hdl.handle.net/1721.1/55168 608065433 Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2009. Cataloged from PDF version of thesis. Includes bibliographical references (p. 93-101). The roll of melt in deformation of the mantle is important for understanding mantle processes and evolution. The Beni Bousera Ultramafic Massif, northern Morocco, shows petrologic evidence that melt was an important part of its history. The massif, dominantly composed of spinel lherzolite with harzburgitic sections, has 10 to 100 meter scale zones which contain abundant pyroxenite dykes, dunite, harzburgite, and secondary lherzolite. These zones are interpreted as areas of focused melt percolation. Lattice preferred orientation (LPO) of olivine crystals from a sample transect across one of these zones was analyzed in comparison with LPO from the surrounding host lherzolite and harzburgite. The LPO from peridotites within the zone was slightly different from those outside the zone, and the LPO from the dunite analyzed was significantly different from the peridotites. Within the melt percolation zone, orientation of the olivine a-axis with respect to the mineral foliation indicates that strain increases towards the center of the zone and that shear sense changes across the zone. This suggests that focused melt flow can induce deformation in its host peridotite. by Jessica R. Stanley. S.M. 105 p. eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Earth, Atmospheric, and Planetary Sciences. The lattice preferred orientation of olivine in Beni Bousera Ultramafic Massif, Morocco Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="cc68189b-a54b-45ab-b333-8dbb3b502902"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>The lattice preferred orientation of olivine in Beni Bousera Ultramafic Massif, Morocco</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2009</PublicationDate> <Authors> <Author> <DisplayName>Stanley, Jessica R</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Earth, Atmospheric, and Planetary Sciences.</Keyword> <Abstract>The roll of melt in deformation of the mantle is important for understanding mantle processes and evolution. The Beni Bousera Ultramafic Massif, northern Morocco, shows petrologic evidence that melt was an important part of its history. The massif, dominantly composed of spinel lherzolite with harzburgitic sections, has 10 to 100 meter scale zones which contain abundant pyroxenite dykes, dunite, harzburgite, and secondary lherzolite. These zones are interpreted as areas of focused melt percolation. Lattice preferred orientation (LPO) of olivine crystals from a sample transect across one of these zones was analyzed in comparison with LPO from the surrounding host lherzolite and harzburgite. The LPO from peridotites within the zone was slightly different from those outside the zone, and the LPO from the dunite analyzed was significantly different from the peridotites. Within the melt percolation zone, orientation of the olivine a-axis with respect to the mineral foliation indicates that strain increases towards the center of the zone and that shear sense changes across the zone. This suggests that focused melt flow can induce deformation in its host peridotite.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>