Proc. IODP, 335, Data report: crystallographic-preferred orientations determined by electron backscattered diffraction in isotropic gabbroic rocks from the sheeted dike/gabbro transition zone in superfast spread crust, ODP Hole 1256D

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Chapter contents Abstract Introduction Methods Results Conclusions Acknowledgments References Figures F1. Lithostratigraphy overview. F2. EBSD maps, Sample 215R-2, 77–79 cm. F3. EBSD maps, Sample 223R-2, 120–122 cm. F4. EBSD maps, Sample 232R-2, 38–40 cm. F5. Misorientation distribution. F6. Grid data poles. F7. Grain data poles. F8. J-index and SPO. Table T1. EBSD data. PDF file			Previous \| Next doi:10.2204/iodp.proc.335.204.2016 Data report: crystallographic-preferred orientations determined by electron backscattered diffraction in isotropic gabbroic rocks from the sheeted dike/gabbro transition zone in superfast spread crust, ODP Hole 1256D¹ Jeremy Deans ² and Benoît Ildefonse³ Abstract Ocean Drilling Program (ODP) Hole 1256D is the first in situ penetration into the sheeted dike/gabbro transition zone and was drilled over the course of several expeditions. The hole was initiated during ODP Leg 206 and lengthened during Integrated Ocean Drilling Program Expeditions 309, 312, and 335. Nine samples were analyzed from two gabbroic sections (Gabbros 1 and 2) recovered from Expedition 312 for crystallographic-preferred orientation of plagioclase, clinopyroxene, olivine, and orthopyroxene. Plagioclase and clinopyroxene are the focus of this study because these two phases are the most modally abundant minerals. Our results are compared with shape-preferred orientations from the same samples. The results demonstrate the absence of crystallographic-preferred orientation in any phases analyzed. Even though the nature of the sheeted dike/gabbro transition zone is still poorly constrained, our results are similar to those reported in rocks that have been interpreted to represent the crystallized axial melt lens in the Oman ophiolite. ¹ Deans, J., and Ildefonse, B., 2016. Data report: crystallographic-preferred orientations determined by electron backscattered diffraction in isotropic gabbroic rocks from the sheeted dike/gabbro transition zone in superfast spread crust, ODP Hole 1256D. In Teagle, D.A.H., Ildefonse, B., Blum, P., and the Expedition 335 Scientists, Proceedings of the Integrated Ocean Drilling Program, 335: Tokyo (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.335.204.2016 ² Department of Geosciences, Texas Tech University, Lubbock TX 79409, USA. jeremy.deans@ttu.edu ³ Géosciences Montpellier, Université de Montpellier, 34095 Montpellier Cedex 5, France. Initial receipt: 7 September 2015 Acceptance: 5 July 2016 Publication: 6 September 2016 MS 335-204 Top of page \| Previous \| Next