Proc. IODP, 304/305, Data report: an electron backscatter diffraction study of a gabbroic shear zone, IODP Expedition 304/305

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Chapter contents Abstract Introduction Methods and materials Samples Sample preparation Data acquisition Results Microstructural characteristics Orientation data Misorientation data Acknowledgments References Figures F1. Hand specimen. F2. Samples. F3. Sample maps. F4. Plagioclase CPO. F5. Misorientation angle distributions of plagioclase. Table T1. Grain-size statistics. PDF file			Previous \| Next doi:10.2204/iodp.proc.304305.201.2009 Data report: an electron backscatter diffraction study of a gabbroic shear zone, IODP Expedition 304/305¹ Angela Halfpenny^2, 3 and David Prior² Abstract Integrated Ocean Drilling Program Expedition 304/305 was designed to investigate the formation and evolution of oceanic core complexes by drilling through the Atlantis Massif oceanic core complex. Characterization of shear zone microstructures from the Atlantis Massif provides information about the area’s deformation history and insight into the formation of oceanic core complexes. Plastic deformation was recognized in only 3% of the recovered core volume. The majority of the shear zones are located in gabbroic lithologies. Using orientation contrast imaging and electron backscatter diffraction, petrofabrics and microstructures were compared between the center and the edge of a gabbroic shear zone collected from IODP Hole U1309D. Analysis of the crystallographic preferred orientation, internal deformation, and grain size variations of feldspar was also performed. ¹Halfpenny, A., and Prior, D., 2009. Data report: an electron backscatter diffraction study of a gabbroic shear zone, IODP Expedition 304/305. In Blackman, D.K., Ildefonse, B., John, B.E., Ohara, Y., Miller, D.J., MacLeod, C.J., and the Expedition 304/305 Scientists, Proc. IODP, 304/305: College Station, TX (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.304305.201.2009 ²Department of Earth and Ocean Sciences, University of Liverpool, Merseyside L69 3GP, United Kingdom. ³Present address: Research School of Earth Sciences, Australian National University, Mills Road, ACT 0200, Australia. Correspondence author: Angela.halfpenny@anu.edu.au Initial receipt: 3 February 2008 Acceptance: 25 July 2008 Publication: 30 January 2009 MS 304305-201 Top of page \| Previous \| Next