Quaternary history of calcium carbonate fluctuations in the western equatorial Indian Ocean (Somali Basin)

• A study of the Quaternary history of calcium carbonate fluctuations in the equatorial Indian Ocean, based on the Swedish Deep-Sea Expedition Core 154 demonstrates that the Calcite Compensation Depth (CCD) was shallower during interglacial periods than during glacials. Higher percentages of calcium carbonate, lower percentages of dissolution-resistant planktonic foraminifera and lower values of the Berger dissolution index, suggesting better calcium carbonate preservation, are recorded during glacial periods and/or at glacial/interglacial transitions. In contrast, interglacial periods are marked by stronger calcium carbonate dissolution. The data indicate that dissolution is the main controlling factor of calcium carbonate in the western equatorial Indian Ocean. Higher dissolution during interglacial periods and enriched δ13C are due to higher noncarbonate productivity and enhanced Antarctic Bottom Water (AABW) ventilation in the equatorial Indian Ocean.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Geology (hsv//eng)

Nyckelord

ANTARCTIC BOTTOM-WATER; ARABIAN SEA; PRESERVATION PATTERNS; LAST GLACIATION; ATLANTIC; SEDIMENTS; PALEOCLIMATOLOGY; DISSOLUTION; CIRCULATION; RECORD

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