Veins of hypogene manganese oxide minerals in the southwestern United States
Economic Geology
By: D. F. Hewett
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Abstract
Characteristic minerals are psilomelane, hollandite, cryptomelane, and coronadite, more rarely ramsdellite and pyrolusite. Host rocks are Mn-deficient; 80 percent of examples are middle to late Tertiary layered volcanics. Though deposits are shallow, mostly mined to only 100-200 feet (maximum 500 feet), a hypogene origin is indicated by their persistent association with barite and fluorite, a peripheral position in the zonal pattern of some metal-mining districts, alteration of plagioclase to K-spar, and abundance of W, Pb, Cu, Mo, Ti, As, Sb. They represent the subzone of Mn-bearing epithermal vein deposits lying nearest the surface, succeeded in depth by four other subzones: barite, fluorite, gold-silver, and base metals.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Veins of hypogene manganese oxide minerals in the southwestern United States |
| Series title | Economic Geology |
| DOI | 10.2113/gsecongeo.59.8.1429 |
| Volume | 59 |
| Issue | 8 |
| Year Published | 1964 |
| Language | English |
| Publisher | Society of Economic Geologists |
| Description | 44 p. |
| First page | 1429 |
| Last page | 1472 |
| Country | United States |
| State | Arizona, California, Colorado, Nevada, New Mexico, Utah |
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