©2026 Biological and Chemical Oceanography Data Management Office.This dataset provides geochemical data (major ions) for porewaters from sediment pushcores collected by DSV Alvin from the R/V Atlantis in July 2023 (AT50-12) at methane seeps in the Southern California Borderlands, California, USA. Cores were sectioned into 1-3 centimeter (cm) horizons, and porewater was extracted shipboard using an argon-pressurized squeezer. Porewater samples were frozen at sea and thawed just before analysis. We report concentrations of fluoride, acetate, formate, chloride, ...
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Sediment pushcores were collected by deep-submergence vehicle (DSV) Alvin from the R/V Atlantis in July 2023 (cruise ID AT50-12) at La Jolla Reef (32.8135, -117.4081), Del Mar Seep (32.9043, -117.7824), Santa Monica Seep Mound 800 (33.7993, -118.6465), Santa Monica Seep Mound 863 (33.7891, -118.6683), Qupé Seep (Redondo Knoll) (33.6505, -118.5522), and Palos Verdes Seep (33.6993, -118.3766). Pushcores were manually sectioned into 1 or 3 centimeter (cm) horizons using plastic rings, and porewaters were extracted using a KC Denmark squeezer. Samples for ion chromatography were frozen shipboard and thawed immediately prior to analysis. Measurements were made using a Thermo Dual Dionex Integrion HPIC ion chromatography system with either a 250 millimeter (mm) Dionex IonPac AS19-4 micrometer (um) column (anions) with 50 mm guard column or a 250 mm Dionex IonPac CS16-4um column (cations) with a 50 mm guard column, in the Resnick Water and Environment Laboratory at the California Institute of Technology (Caltech).
Magyar, J. S., Orphan, V. J., Goffredi, S. (2026). Porewater geochemical data from sediment pushcores collected from Southern California Seeps in July 2023 on R/V Atlantis cruise AT50-12. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2025-11-24 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.986669.1 [access date]
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