Cerro de Pasco and other massive sulfide deposits of central Peru
Conference
·
· Geol. Soc. Am., Abstr. Programs; (United States)
OSTI ID:6874336
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-
- Conference Information:
- Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Journal Volume: 17
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
580300 -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
580400* -- Geochemistry-- (-1989)
CENOZOIC ERA
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMISTRY
CHERT
DEVELOPING COUNTRIES
GALENA
GEOCHEMISTRY
GEOLOGIC AGES
GEOLOGIC FORMATIONS
HYDROTHERMAL ALTERATION
IGNEOUS ROCKS
IRON COMPOUNDS
IRON SULFIDES
LATIN AMERICA
LEAD COMPOUNDS
LEAD ORES
LEAD SULFIDES
MINERALOGY
MINERALS
ORES
PERU
PETROGENESIS
PYRITE
ROCKS
SEDIMENTARY ROCKS
SILVER ORES
SOUTH AMERICA
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TECTONICS
TERTIARY PERIOD
TRANSITION ELEMENT COMPOUNDS
VOLCANIC ROCKS
ZINC ORES
580300 -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
580400* -- Geochemistry-- (-1989)
CENOZOIC ERA
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMISTRY
CHERT
DEVELOPING COUNTRIES
GALENA
GEOCHEMISTRY
GEOLOGIC AGES
GEOLOGIC FORMATIONS
HYDROTHERMAL ALTERATION
IGNEOUS ROCKS
IRON COMPOUNDS
IRON SULFIDES
LATIN AMERICA
LEAD COMPOUNDS
LEAD ORES
LEAD SULFIDES
MINERALOGY
MINERALS
ORES
PERU
PETROGENESIS
PYRITE
ROCKS
SEDIMENTARY ROCKS
SILVER ORES
SOUTH AMERICA
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TECTONICS
TERTIARY PERIOD
TRANSITION ELEMENT COMPOUNDS
VOLCANIC ROCKS
ZINC ORES