PLANAR MICROSTRUCTURES (LAMELLAR SUBGRAINS) IN FELDSPAR …
microstructures (such as PDFs) from those formed prior to impact such as exsolution lamellae, veins, cleavages, and twin planes [e.g. 2]. We investigated the microstructures of Or-rich alkali feldspar phenocrysts from granitoid rocks recovered from the peak ring of the Chicxulub impact structure during the recent IODP-ICDP Expedition 364 [3].