Figure F55. A small fracture in gabbro with incipient cataclasis (Thin Section 33; Sample 345-U1415J-3R-1, 74–82 cm [Piece 10]; under crossed polars). Left lateral slip of ~100 µm has displaced plagioclase (Pl; white arrows). This displacement produced an extensional site in which prehnite (Pr; orange) and both randomly oriented and fibrous chlorite (Chl) have precipitated. Cal = calcite, Cpx = clinopyroxene.
Previous | Close | Next | Top of page