. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. SECT. 3] PELAGIC SEDIMENTS 691 Recent deep-sea sediments have been observed in several instances, both in the Pacific (Bramlette, unpublished) and in the Atlantic (Correns, 1937; Radczew- ski, 1937). Extensive dolomitization is observed to occur at the interface of basaltic intrusions, such as the one encountered in the experimental Mohole off Guadalupe Island. CaCO, 4000. 00% 5000 6000 m Fig. 20. Average carbonate content as a function of water depth in the Atlantic and Pacific, demonstrating the effect of total rate of d
. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. SECT. 3] PELAGIC SEDIMENTS 691 Recent deep-sea sediments have been observed in several instances, both in the Pacific (Bramlette, unpublished) and in the Atlantic (Correns, 1937; Radczew- ski, 1937). Extensive dolomitization is observed to occur at the interface of basaltic intrusions, such as the one encountered in the experimental Mohole off Guadalupe Island. CaCO, 4000. 00% 5000 6000 m Fig. 20. Average carbonate content as a function of water depth in the Atlantic and Pacific, demonstrating the effect of total rate of deposition on the rate of solution of calcium carbonate at the ocean floor. Under similar depth conditions the ultimate carbonate content of the sediment is, on the average, higher in the Atlantic than in the Pacific. This is due to more rapid burial of the sediment in the Atlantic Ocean, which, per surface area, receives considerably more solid and dissolved material from the continents than does the Pacific. (From Revelle, 1944.) Much detrital carbonate appears to be carried by wind into the pelagic environment. Calcite and dolomite are often the dominant components of eolian dust, which occasionally also contains small amounts of breunnerite (Radczewski, 1937). In Mediterranean sediments, calcite is the dominant eolian material (Norin, 1958). In deep pelagic sediments most of the fine-grained eolian calcite is dissolved, but in areas with a heavy eolian fallout and a high preservation of accumulating carbonates, eolian calcite and dolomite might be quantitatively Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hill, M. N. (Maurice Neville), 1919-. New York : Interscience Pub.
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