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- W2078950709 abstract "Metal-oxide and sulphide deposits, chemically similar to the hydrothermal deposits of modern and ancient oceanic spreading axes, occur in two areas of the Argolis Peninsula of the Peloponnesus, Greece. In the first, in northeastern and central Argolis, manganese ores immediately overlie MORB-type extrusives of mid-Jurassic age. After Triassic rifting this oceanic crust formed during Jurassic time and was then tectonically emplaced over the adjacent continental margin in the Late Jurassic. The manganese ores (Palea Epidavros) were precipitated from low-temperature hydrothermal vent waters on the axis of a relatively unrifted ocean ridge, which was possibly slow-spreading. The deep-sea sediment cover comprises pelagic carbonate accumulated on the ridge flanks, then ribbon radiolarites deposited on the abyssal plain below the CCD, located close enough to a continental margin to allow deposition of shallow water-derived calciturbidites. In the second area, Ermioni, in the southern Argolis Peninsula (Adheres), massive sulphides and metalliferous oxide sediments occur with mafic extrusives and terrigenous turbidites. Although previously regarded as a single stratigraphical succession (“Shale-sandstone Formation”), the mafic lavas and metal deposits are interpreted here as ophiolitic slices that were incorporated into the turbidites by thrusting, possibly as a trench-accretionary complex. The massive sulphides were precipitated from high-temperature vents sited near the axis of a relatively unrifted spreading ridge which was possibly fast-spreading. Ferruginous (ochres) and ferromanganiferous (umbers) oxide sediments were dispersed around these vents, whereas strongly fractionated manganese ores precipitated from separate low-temperature hydrothermal sites. Alternative tectonic scenarios are discussed." @default.
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- W2078950709 date "1987-06-01" @default.
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- W2078950709 title "Ocean ridge origin and tectonic setting of mesozoic sulphide and oxide deposits of the Argolis Peninsula of the Peloponnesus, Greece" @default.
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- W2078950709 doi "https://doi.org/10.1016/s0037-0738(87)80002-7" @default.
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