
doi: 10.1086/625995
Near east-dipping thrust faults in the Green Mountains and Berkshire Hills, New England, quartzites exhibit westward overturned folds with subhorizontal axes, and an axial-plane cleavage dips east. Close to a thrust fault the cleavage becomes so intense that it obscures the limbs of folds. Where the quartzite has been folded isoclinally, the cleavage is essentially parallel to the limbs but cuts across apices of folds. Intersections of gently folded beds and axial plane cleavage produce a b-lineation that coincides with the orientation of the fold axes. Close to thrust faults, however, an a-lineation becomes more prominent. On the eastward-dipping s-planes, the a-lineation agrees closely with the dip of the planes, although in places its bearing deviates slightly to the east-southeast. Folds with axes parallel to this a-lineation are rare and small. In mildly deformed quartzite, several hundred feet from thrust faults, quartz grains are slightly elongated parallel to the b-fabric axis, and the c-axes of t...
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