10.1594/PANGAEA.772140Capo, RCRCCapoDePaolo, Donald JDonald JDePaoloPANGAEA1990Event labelSample code/labelSample commentDEPTH, sediment/rockNannofossil zoneAGEPotassiumStrontiumRubidium-87/Strontium-86 ratioStrontium-87/Strontium-86 ratioStrontium-87/Strontium-86 ratio, errorDrilling/drill rigCorer, submersiblePiston corerDSDP/ODP/IODP sample designationLeg90V28Glomar ChallengerVemaDeep Sea Drilling Project (DSDP)Smirnov, AlexanderAlexanderSmirnov0000-0002-8208-13041971-05-08T00:00:00/1982-12-15T00:00:00Supplementary Dataset10.1126/science.249.4964.51337 data pointstext/tab-separated-valuesCreative Commons Attribution 3.0 UnportedMeasurements of marine carbonate samples indicate that during the past 2.5 million years the 87Sr/86Sr ratio of seawater has increased by 14 * 10**-5. The high average rate of increase of 87Sr/86Sr indicates that continental weathering rates were exceptionally high. Nonuniformity in the rate of increase suggests that weathering rates fluctuated by as much as ±30 percent of present-day values. Some of the observed shifts in weathering rates are contemporaneous with climatic changes inferred from records of oxygen isotopes and carbonate preservation in deep sea sediments.Supplement to: Capo, RC; DePaolo, Donald J (1990): Seawater Strontium isotopic variations from 2.5 million years ago to the present. Science, 249(4964), 51-55156.1-156.1-31.16720.33South Pacific/Tasman Sea/CONT RISEPacific/off Hawaii