远喷口型SEDEX铅锌矿床最新研究进展及发展趋势

孙华山, 杨辉

Advance and Trend of the Vent-Distal SEDEX Lead-Zinc Deposits

Huashan SUN, Hui YANG

图2 海底硫酸盐—甲烷过渡带（a）及甲烷厌氧氧化作用（b）示意图［29］ （a）上部硫酸盐还原带，下部甲烷带，二者之间为硫酸盐—甲烷过渡带；（b）粗黑色箭头代表上部SO42-向下渗透，下部CH4向上渗透，二者渗透过程中出现甲烷厌氧氧化作用（AOM）及主要化学反应。此外，深部有机质分解形成的甲烷越向上δ13C越亏损，相反，硫酸盐还原形成的硫化物越向上δ34S越富集

Fig. 2 Schematic figures for submarine sulphate-methane transition zone （a） and anaerobic oxidation of methane （b）［29］ （a）Sulphate reduced zone in the upper level， methane forming zone in the lower level， sulphate methane transition zone between them； （b）Thicked black arrows denote that SO42- infiltrates downward， whereas CH4 transfers upward， and anaerobic oxidation of methane occurs in the sulphate methane transition zone. In addition， in the upward stratigraphic sequences， it is the characteristics of depletion in δ13C while enrichment in δ34S