Content and carbon and oxygen isotope composition of total carbon, total non-carbonate carbon, and total inorganic carbon of basement rocks from the southern wall of the Atlantis Massif, IODP Expedition 357

The carbon geochemistry of serpentinized peridotites, gabbroic rocks, and sediments recovered during IODP Expedition 357 (October to December 2015) on the Atlantis Massif, Mid-Atlantic Ridge was examined to characterize carbon sources and the fate of dissolved organic (DOC) and inorganic carbon (DIC) in seawater during long-lived hydrothermal circulation and serpentinization. The measurements were performed at the ETH Zurich, Geological Institute from 2017 to 2020 using a FlashEA 1112 Elemental Analyzer (EA) interfaced via a Conflo IV to a Delta V Plus Isotope Ratio Mass Spectrometer for total carbon (TC) and total non-carbonate carbon (NCC) content and isotope composition, a CM 5012 CO2 coulometer interfaced with a CM 5130 Acidification Module for the total inorganic carbon (TIC) content, and a GasBench II connected to a Delta V Mass Spectrometer for the total inorganic carbon isotope composition. The Results are reported as replicates.本研究针对大西洋中脊（Mid-Atlantic Ridge）亚特兰蒂斯地块（Atlantis Massif）上的国际大洋发现计划（IODP）357航次于2015年10月至12月间采集的蛇纹岩化橄榄岩、辉长岩及沉积物开展碳地球化学分析，旨在阐明碳源特征以及海水内溶解有机碳（DOC）与溶解无机碳（DIC）在长期热液循环与蛇纹岩化过程中的归趋。测试工作于2017年至2020年在苏黎世联邦理工学院（ETH Zurich）地质研究所完成，所用分析设备包括：通过Conflo IV接口与Delta V Plus同位素比率质谱仪相连的FlashEA 1112元素分析仪（EA），用于测定总碳（TC）与总非碳酸盐碳（NCC）的含量及同位素组成；搭载CM 5130酸化模块的CM 5012 CO₂库仑计，用于测定总无机碳（TIC）含量；以及与Delta V质谱仪相连的GasBench II装置，用于测定总无机碳同位素组成。所有测试结果均以平行重复样形式给出。