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- W2068604029 abstract "Abstract Laramide and younger mineral deposits in the Central America-Caribbean area exhibit a regional compositional zonation in which Pb-Zn deposits (low in Ag) are confined to northernmost Central America and Au and/or Cu deposits are found throughout the rest of the area. A zone of Ag-rich deposits separates these two regions and marks the boundary between the Paleozoic-Precambrian(?) cratonic environment of the Pb-Zn deposits and the Tertiary island arc environment of the Au and Cu deposits. Intrusive igneous rocks (quartz diorite to quartz monzonite) in the area reflect this zonation in that they are Pb-rich (about 10–25 ppm) in the Pb-Zn deposit zone and Cu-rich (about 80–200 ppm) in the Cu-Au zone. Pb isotope data for galenas from 15 deposits in the Central America-Caribbean area form a linear array with slope 0.065 in which the two least radiogenic samples are from the Au-Cu zone and the two most radiogenic samples are from the Pb-Zn zone. A simple two-stage model with the end of the second stage in the Tertiary suggests an initial source of age about 750 m.y. implying a late Precambrian to early Paleozoic component in the lead if the regression is not a mixing phenomenon. These data suggest that the Pb isotope composition of Central American and Caribbean mineral deposits is affected by the type and composition of crustal material underlying each zone." @default.
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- W2068604029 date "1976-07-01" @default.
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- W2068604029 title "Source of lead in Central American and Caribbean mineralization" @default.
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- W2068604029 doi "https://doi.org/10.1016/0012-821x(76)90218-1" @default.
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