Technological applications for Neoproterozoic-Cambrian limestones from northwest Argentina

Abstract

Some rocks have been used as ornamental stones without knowledge of the natural material or its characteristics when included in agglomerates, or even those acquired during the benefit process. This study shows that prospection of ornamental stones should include studies of physical, chemical and mechanic properties that allow determination of its application to industrial merchant. The Neoproterozoic-Cambrian limestones fron Northwest Argentina extend along a wide area, with interesting sectors of low fracturation, being lack of oxidation and karst morphologies. High compresion and bending strength values of this micrites, good engraved qualities, polish surfaces and cut facilities generate an important industrial interest for exploration and quarry development evaluation at Sierra de Castillejo. Limestones abrasive and weather resistance, along with very fine-grain and porosity reduction due to cementation by the calcite veins framework, make them suitable for covers of high performance furniture and ornamentation in architectural designs. If fractured, they are suitable for paving tiles, sculptures, small ornamental stones, adornments, ordinary jewels, arids and lime formation. Reserves at Sierra de Castillejo are equivalent to 20-year production of the San Juan limestones and 11-year production of the Córdoba marbles.