PANGAEA_701230 (Table 1) Carbon, oxygen and strontium isotopic composition of the rhodochrosite nodules from DSDP Sites 503A and 503B Morad, S; Al-Aasm, Ihsan S (Table 1) Carbon, oxygen and strontium isotopic composition of the rhodochrosite nodules from DSDP Sites 503A and 503B 1997 PANGAEA Dataset 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, https://doi.org/10.1016/S0037-0738(97)00066-3 https://doi.pangaea.de/10.1594/PANGAEA.701230 Investigator S Morad Earth Science DEPTH, sediment/rock Sample code/label Sample type δ13C δ18O Strontium-87/Strontium-86 ratio Age, dated geoscientificInformation 68-503 Drilling/drill rig Leg68 DSDP/ODP/IODP sample designation Mass spectrometer VG SIRA 12 Mass spectrometer Finnigan MAT 261 Age, paleomagnetic Glomar Challenger 1979-09-06 1979-09-06 Complete 4.0507 4.0507 -95.6368 -95.6368 17.6 m (DEPTH, sediment/rock) 164.6 m (DEPTH, sediment/rock) DSDP Deep Sea Drilling Project unrestricted CC-BY-3.0: Creative Commons Attribution 3.0 Unported English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

Leobener Str.

Bremen Bremen 28359 Germany online 158 data points text/tab-separated-values

Calcic 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. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.701230"!

https://doi.org/10.1016/S0037-0738(97)00066-3 Conditions of rhodochrosite-nodule formation in Neogene-Pleistocene deep-sea sediments: evidence from O, C and Sr isotopes https://hdl.handle.net/10013/epic.27914.d001 DSDP/ODP/IODP sample designation https://www.deepseadrilling.org/ DSDP https://www-odp.tamu.edu:443/glomar.html Glomar Challenger DIF 9.4 2026-07-15