(Table 1) Carbon, oxygen and strontium isotopic composition of the rhodochrosite nodules from DSDP Sites 503A and 503B

10.1594/PANGAEA.701230Morad, SSMorad0000-0002-8214-0896Al-Aasm, Ihsan SIhsan SAl-Aasm(Table 1) Carbon, oxygen and strontium isotopic composition of the rhodochrosite nodules from DSDP Sites 503A and 503BPANGAEA1997DEPTH, sediment/rockSample code/labelSample typeδ13Cδ18OStrontium-87/Strontium-86 ratioAge, datedDrilling/drill rigDSDP/ODP/IODP sample designationMass spectrometer VG SIRA 12Mass spectrometer Finnigan MAT 261Age, paleomagneticLeg68Glomar ChallengerDeep Sea Drilling Project (DSDP)1979-09-06T00:00:00Supplementary Dataset10.1016/S0037-0738(97)00066-3158 data pointstext/tab-separated-valuesCreative Commons Attribution 3.0 UnportedCalcic rhodochrosite occurs as nodules around burrows in late Neogene-early Pleistocene pelagic sediments of the Galapagos Ridge in the Guatemala Basin, eastern equatorial Pacific (DSDP Leg 68; Site 503). Growth was accomplished in the suboxic zone (d13C = -4.3 per mil to -1.3 per mil) at an estimated depth between ~30 and 70 cm beneath the seafloor. The rhodochrosites have 87Sr/86Sr ratios (0.708945–0.709073) that largely record the small-scale changes in seawater Sr-isotopic composition. The anomalous enrichment of the rhodochrosite in 18O isotopes (d18OPDB up to +6.4 per mil is attributed to the dissociation of gas hydrates.Supplement to: Morad, S; Al-Aasm, Ihsan S (1997): Conditions of rhodochrosite-nodule formation in Neogene-Pleistocene deep-sea sediments: evidence from O, C and Sr isotopes. Sedimentary Geology, 114(1-4), 295-304-95.63684.0507North Pacific/FLANK