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 Conclusions CPO measurements and analysis presented herein show that gabbroic rocks in the Gabbro 1 and 2 intervals do not exhibit significant crystallographic fabrics; hence, there is no record in the crystallographic data to suggest significant magmatic flow in these gabbroic intrusions. Trela et al. (2015) reported “distinct and consistent” plagioclase SPO in samples Gabbros 1 and 2; however, this is not confirmed by the results presented here. Our results are consistent with textures observed (i.e., no preferred shape or crystallographic orientation) in ophiolites at the sheeted dike complex–fossilized melt lens transition zone (e.g., MacLeod and Yaouancq, 2000; France et al., 2009). However, this study cannot further constrain the structural context of Gabbros 1 and 2 within this transition zone. Top of page \| Previous \| Next

Conclusions