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San Vincente |
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Peru |
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Zn Pb
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Super Porphyry Cu and Au
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The San Vincente carbonate hosted zinc-lead deposit is located some 300 km east of Lima in Peru, in the sub-Andean highland/Cordillera Oriental between the Andean High Cordillera and the Amazon forests (#Location: 11° 14' 0"S, 75° 23' 6"W).
It is hosted by a 1400 m thick Upper Triassic to Lower Jurassic carbonate platform unit on the western margin of the Brazilian Shield. Three ore bearing horizons are found within this unit. Just to the west a highly tectonised whitish biotite-hornblende granodiorite has been overthrust onto the carbonates above a 20 to 40°W dipping reverse fault. A few kilometres to the east the Permo-Triassic Ramon granite is exposed, separated from the host carbonates by a red bed clastic unit which regionally also contains Permo-Triassic alkaline and per-alkaline lavas. The red beds unconformably overlie the granites, but pass conformably up into the host carbonates. The immediate host dolomite is overlain by a bituminous silty limestone within the carbonate sequence.
Sphalerite and galena are the only ore minerals, with minor pyrite, and occur as lens shaped bodies which are generally parallel to bedding, but with no great lateral continuity. These lenses are confined to dolomitised tidal flat and lagoonal facies with cryptalgal lamination and evaporite moulds, as well as adjacent oolithic grainstones of barrier facies.
Individual ore lenses rarely exceed 300 m in lateral extent and range from a few tens of centimetres to a few metres in thickness with sharp vertical contacts with the enclosing limestones. The ore lenses exhibit a regular internal banding referred to as "zebra ore", which does not reflect any inherited texture, but is a product of diagentic crystallisation. The ore leses are composed of several generations of recrystallised dolomite with associated sphalerite and galena, locally containing up to 40% Zn.
Production + reserves in 1990 were - 11.1 Mt @ 12.6% Zn, 0.8% Pb.
For detail see the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 1989.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
San Vincente
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Selected References:
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Fontbote L, Gorzawski H 1990 - Genesis of the Mississippi Valley-type Zn-Pb deposit of San Vicente, central Peru: geologic and isotopic (Sr, O, C, S, Pb) evidence: in Econ. Geol. v85 pp 1402-1437
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Spangenberg J E, Fontbote L, Macko S A 1999 - An evaluation of the inorganic and organic geochemistry of the San Vicente Mississippi Valley-type Zinc-Lead district, central Peru: implications for ore fluid composition, mixing processes, and Sulfate reduction: in Econ. Geol. v94 pp 1067-1092
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Torro, L., Millan-Nunez, A.J., Benites, D., Gonzalez-Jimenez, J.M., Laurent, O., Tavazzani, L., Vallance, J., Chelle-Michou, C., Proenza, J.A., Flores, C., Melgarejo, J.C., Rosas, S. and Fontbote, L., 2023 - Germanium- and gallium-rich sphalerite in Mississippi Valley-type deposits: the San Vicente district and the Shalipayco deposit, Peru: in Mineralium Deposita v.58, pp. 853-880.
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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