Figure F9. Diagram of core reference frame for VCD and X-ray computed tomography (CT) and the xyz coordinate system used in orientation data calculations, Expedition 343. Orientations of planar features identified in X-ray CT scans can be calculated from the trend and plunge (α and β) of the lineation formed by the intersection of the plane with the slice and coronal CT images. α1 is the angle between 000° and the intersection of the plane with the slice CT image (plane perpendicular to the core axis), and β1 = 0°. β2 is the plunge of the intersection of the planar feature with the coronal CT image, and α2 = 90° or 270°.
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