Carbonate concentrations of ODP Leg 115 samples, supplement to: Curry, William B; Cullen, James L; Backman, Jan (1990): Carbonate accumulation in the Indian Ocean during the Pliocene: evidence for a change in productivity and preservation at about 2.4 Ma. In: Duncan, RA; Backmann, J; Peterson, LC; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 115, 509-518

William B Curry, James L Cullen & Jan Backman
We measured carbonate concentrations in Pleistocene and Pliocene sediments deposited at Sites 709, 710, and 711. Carbonate concentrations exhibit low-amplitude, long-wave length (300-400 k.y. period) variations at the shallowest sites (709 and 710). Before 2.47 Ma, all three sites exhibit higher frequency (100 k.y. period) variations. The deepest site (711) exhibited low-amplitude variations and very low concentrations up to the Gauss/Matuyama magnetic reversal (2.47 Ma), then concentrations abruptly increased. After 2.47 Ma, carbonate concentrations at...
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