Assessment effect of structure and texture characteristics of rock unitsin Alvand pluton on the outcrop resistance against destruction andweathering

The Alvand plutonic mass is one of the largest plutonic bodies in the Sanandaj – Sirjanmetamorphic belt. This paper evaluates outcrop relative resistance of rock units againstdestruction and weathering based on intact rock texture and structure properties with using thenumerical value. For this purpose at first the some properties of texture and structure as thecriteria were chosen and indexed. Then relative resistance outcrop of rock unites based onnumerical value from 1 to 10 was assessed, and the zoning map was provided. AccordinglyPegmatitic granite has minimum resistence with 3.75 and Olivine gabbro has maximumreasistence with 5.75. Weighted average degree of Alvand pluton was specified 5.1 whichreflects the moderate resistance degree outcrops against destruction and weathering in terms ofstructure and texture characteristics between internal igneous rocks.