Structural Context of Mid-Tertiary Mineralization in the Mammoth and San ManuelDistricts, Southern Arizona. Chapter C

摘要

The San Manuel and Mammoth mining districts are spatially overlapping centers ofmineralization of late Cretaceous to early Tertiary (henceforth Laramide) and mid-Tertiary age, respectively, on the flanks of the Black Hills, facing the San Pedro valley of southeastern Arizona. San Manuel is a large porphyry copper deposit, mined since 1946. The Mammoth district, is a vein set that has produced gold, silver, vanadium, molybdenum, lead, zinc, minor copper, and silica (for flux) at various times since first exploited in 1879. The study examines mid-Tertiary mineralization of the area in the context of both detachment and basin-range faulting. The surface geochemistry of a previously undescribed area of alteration is included.