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Hydrothermally altered rock

Mixture of clay, sericite, albite, and pyrophyllite. Locally pyrite-bearing. Majority of areas mapped as hydrothermally altered are intrusive rocks. Exposed in the umacao, Juncos, Barranquitas, Cayey, Naranjito, Aquas Buenas, Comerio, Caquas, Cailes, Rosario, San German, Gurabo, Patillas, Naguabo, Guayama, and Punta Tuna quadrangles
LabelTKha
Geologic ageTertiary ?-Cretaceous?
QuadranglesAguas Buenas, Barranquitas, Caguas, Cayey, Ciales, Comerío, Guayama, Gurabo, Humacao, Juncos, Naguabo, Naranjito, Orocovis, Patillas, Punta Tuna, Rosario, San Germán
MunicipiosAguas Buenas, Barranquitas, Bayamon, Caguas, Carolina, Cayey, Cidra, Comerio, Guayama, Guaynabo, Gurabo, Hormigueros, Humacao, Juncos, Lajas, Las Piedras, Mayaguez, Naguabo, Naranjito, Orocovis, Patillas, San German

Bibliographic references

Broedel, C.H., 1961, Preliminary geologic map showing iron and copper prospects in the Juncos quadrangle, Puerto Rico: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-326, scale 1:20,000.Curet, A.F., 1986, Geologic map of the Mayagüez and Rosario quadrangles, Puerto Rico: U.S. Geological Survey Miscellaneous Investigations Series Map I-1657, scale 1:20,000.
Glover, Lynn, III, 1982, Preliminary geologic map of the Patillas and Guayama quadrangles, Puerto Rico: U.S.Geologic Survey Open-File Map 82-1097, scale 1:20,000.
Pease, M.H., Jr., 1968b, Geologic map of the Naranjito quadrangle, Puerto Rico (with text): U.S. Geological Survey Miscellaneous Geologic Investigations Map I-508, scale 1:20,000.Rogers, C.L., 1979, Geologic map of the Caguas quadrangle, Puerto Rico: U.S. Geological Survey Miscellaneous Investigations Series Map I-1152, scale 1:20,000.Rogers, C.L., and others, 1979, Geologic map of the Yabucoa and Punta Tuna quadrangles, Puerto Rico: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-1086, scale 1:20,000.Rogers, C.L., Cram, C.M., Pease, M.H., and Tischler, M.S., 1979, Geologic map of the Yabucoa and Punta Tuna quadrangles, Puerto Rico: U.S. Geological Survey Miscellaneous Investigations Series Map I-1086, scale 1:20,000.Volckmann, R.P., 1984b, Geologic map of the Puerto Real quadrangle, southwest Puerto Rico: U.S. Geological Survey Miscellaneous Investigations Series Map I-1559, scale 1:20,000.
Seiders, 1971a
Berryhill and Glover, 1960
Briggs and Gelabert, 1962
Pease, 1968
M'Gonigle, 1978