2026-10-15T08:29:02Z https://oai.datacite.org/oai

doi:10.1594/pangaea.762048 2024-07-20T14:09:19Z PANGAEA PANGAEA.REPOSITORY

Pore-water chemistry of ODP Sites 124-767 and 124-768 von Breymann, Marta T Swart, Peter K Brass, Garrett W Berner, Ulrich PANGAEA 1991 Issued: 1991 doi:10.2973/odp.proc.sr.124.154.1991 Drilling/drill rig Leg124 Joides Resolution Ocean Drilling Program (ODP) The combination of multiple sediment sources and varying rates of sediment accumulation in the Celebes and Sulu seas have had significant impact on the processes of diagenesis, mineralization, and pore-fluid flow. Isotopic and mass-balance calculations help elucidate the various reactions taking place in these western Pacific basins, where ash alteration and basalt-seawater interactions are superimposed on the effects of sulfate oxidation of organic carbon and biogenic methane and of dolomitization of biogenic carbonates. Based on the shape of the calcium and magnesium depth profiles, two major reactive zones have been identified. The first is located near the zone of sulfate depletion and is characterized by carbonate recrystallization, dolomitization and ash alteration reactions at both Ocean Drilling Program Sites 767 and 768. The second reactive zone corresponds to the bottom of the sedimentary sequence and is characterized by alteration reactions in the basement (Site 767) and in the pyroclastic deposits beneath the sediment column (Site 768). Supplement to: von Breymann, Marta T; Swart, Peter K; Brass, Garrett W; Berner, Ulrich (1991): Pore-water chemistry of the Sulu and Celebes Seas: extensive diagenetic reactions at Sites 767 and 768. In: Silver, EA; Rangin, C; von Breymann, MT; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 124, 203-215 en Collection Supplementary Publication Series of Datasets application/zip Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode