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Organic carbon and total nitrogen stable isotopes are reported for sediments drilled during Integrated Ocean Drilling Program Expedition 308. Brazos-Trinity Basin IV sediments exhibited a broad range in organic carbon δ 13 C ranging between –27‰ and –20‰ (δ 13 C average = –24.1‰) compared to Ursa Basin sediments that are generally more depleted in 13 C (δ 13 C average = –25.7‰). Bulk δ 15 N values across all basins ranged from –2.7‰ to 8.2‰ (δ 15 N average = 3.7‰) and showed no obvious trend. The relative contribution of marine and terrestrial detrital material deposited within these sediments was inferred by comparing isotopic compositions to C/N values. The significant contribution of inorganic nitrogen (Nbound average ≈ 75%), as estimated from total organic carbon/total nitrogen plots, likely lowered the observed C/N values.

proceedings of the integrated ocean drilling program. expedition reports/proceedings of the integrated ocean drilling program

Data report: isotope compositions of sedimentary organic carbon and total nitrogen from Brazos-Trinity Basin IV (Sites U1319 and U1320) and Ursa Basin (Sites U1322 and U1324), deepwater Gulf of Mexico