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Basal sediments cored above alkali basalt at Site 183 beneath the Aleutian Abyssal Plain include iron-rich clays, a geothitebearing calcareous ironstone (23.8% Fe and 4.16% Mn, CaCθ3free), and a pyrite-bearing unfossiliferous aragonitic limestone with 1.95 per cent Sr. The diversity of facies is similar to that of Red Sea sediments cored in deeps filled with hot metallogenic brines. The comparison is strengthened by the limestone since the Red Sea is the only other locale where deep marine indurated aragonitic limestones have been reported, apparently associated with the hot metal-rich brines. Experimental evidence verifies that aragonite is the only CaCθ3 polymorph precipitated from carbonate-saturated seawater above 30°C. In the deep sea, aragonite formed in surface waters usually dissolves before reaching bottom, or, once there, inverts to calcite. The Sr concentration in the Site 183 limestone is about twice as high as that in aragonite produced experimentally from seawater or as found in typical shallow-marine occurrences. These relations imply that the Site 183 limestone precipitated from a nearbottom, Srand metal-rich brine, possibly well above bottom

Basal Ferromanganoan Sediments at DSDP Site 183, Aleutian Abyssal Plain, and Site 192, Meiji Guyot, Northwest Pacific, Leg 19