Cerro de Pasco and other massive sulfide deposits of central Peru

Conference · Tue Jan 01 00:00:00 EST 1985 · Geol. Soc. Am., Abstr. Programs; (United States)

OSTI ID:6874336

Cheney, E S

The famous Cerro de Pasco Pb-Zn-Ag deposit historically has been considered to be hydrothermally derived from an adjacent Tertiary volcanic vent. However, texturally massive pyrite-chert and pyrite-sphalerite-galena in the deposit have the same strike and cross folds as the adjacent pre-Tertiary strata. Both the deposit and the strata are cut by one of the large Longitudinal Faults. Both dikes and pyrite-enargite veins associated with the vent cut the massive sulfides; fragments of massive pyrite occur in the vent. A few examples of laminated pyrite and chert, banded pyrite and chert, banded pyrite and sphalerite, and banded pyrite, sphalerite, and galena are preserved in the massive sulfide portion of the deposit. The deposit has the composition and zoning patterns typical of shale-hosted massive sulfides. Cerro de Pasco probably in part of the pelitic Devonian Excelsior formation. The Colquijirca deposit 8 km to the south and the San Cristobal district 110 km to the south likewise have been considered to be Tertiary volcanic hydrothermal deposits. Colquijirca consists of stratigraphically controlled mantos of layered pyrite, chert and tuff in the Tertiary Calera formation. The mantos of the San Cristobal district are along the upper contact of the pyritic, Permian, Catalina felsic volcanic rocks; some ore consists of laminated pyrite and sphalerite. Tertiary plutons are conspicuously absent at San Cristobal, and the ores are brecciated by Tertiary folding.

• Research Organization: Univ. of Washington, Seattle (USA)
• OSTI ID: 6874336
• Report Number(s): CONF-8510489-
• Journal Information: Geol. Soc. Am., Abstr. Programs; (United States), Vol. 17; Conference: 98. annual meeting of the Geological Society of America, Orlando, FL, USA, 28 Oct 1985
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
LEAD ORES
GEOCHEMISTRY
MINERALOGY
PETROGENESIS
PERU
SILVER ORES
ZINC ORES
CHEMICAL COMPOSITION
CHERT
GALENA
GEOLOGIC FORMATIONS
HYDROTHERMAL ALTERATION
PYRITE
TECTONICS
TERTIARY PERIOD
VOLCANIC ROCKS
CENOZOIC ERA
CHALCOGENIDES
CHEMISTRY
DEVELOPING COUNTRIES
GEOLOGIC AGES
IGNEOUS ROCKS
IRON COMPOUNDS
IRON SULFIDES
LATIN AMERICA
LEAD COMPOUNDS
LEAD SULFIDES
MINERALS
ORES
ROCKS
SEDIMENTARY ROCKS
SOUTH AMERICA
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
580400* - Geochemistry- (-1989)
580300 - Mineralogy
Petrology
& Rock Mechanics- (-1989)