The Manantial Espejo Epithermal Low-Sulfidation Silver (-Gold) Deposit, Deseado Massif, Argentina

摘要

The Manantial Espejo district (Argentina) hosts a low-sulfidation epithermal Ag (-Au) deposit with a proven and probable reserve of 38 MozAg and 0.55 MozAu. The district lies along the southern rim of the Deseado Massif in the Middle to Late Jurassic Chon Aike Province, a large bimodal igneous province dominated by silicic volcanic rocks that were formed during the initial extension leading to the opening of the South Atlantic Ocean. The district stratigraphy consists of 162 to 161 Ma old rhyodacitic to rhyolitic volcaniclastic rocks of the Chon Aike and La Matilde Formations, followed by 160 to 157 Ma old andesites and dacites of the informally called intermediate formation.