(Table 1) I, Br, B, d11B and Mn concentrations in ODP Site 131-808

This study of the interstitial water concentration-depth distributions of iodide, bromide, boron, d11B, and dissolved organic carbon, as represented by absorbance at 325 nm (yellow substance: YS) and laser-induced fluorescence (LIF), is a follow-up of the extensive shipboard program of interstitial water analysis during ODP Leg 131. Most of the components studied are associated with processes involving the diagenesis of organic matter in these sediments.
Three zones of the sediment column are discussed separately because of the different processes involved in causing concentration changes:
1. The upper few hundreds of meters: In this zone, characterized by very high sedimentation rates (>1200 m/m.y.), interstitial waters show very sharp increases in alkalinity, ammonia, iodide, bromide, YS, and LIF, mainly as a result of the diagenesis of organic carbon;
2. Whereas below 200 mbsf concentration gradients all show a decreasing trend, the zone at ~ 365 mbsf is characterized by concentration reversals, mainly due to the recent emplacement of deeper sediments above this depth as a result of thrust-faulting;
3. The décollement zone (945-964 mbsf) is characterized by concentration anomalies in various constituents (bromide, boron, d11B, manganese, LIF). These data are interpreted as resulting from an advective input of fluids along the zone of décollement as recent as ~ 200 ka. Possibly periodic inputs of anomalous fluids still seem to occur along this décollement zone.

本研究聚焦于碘化物、溴化物、硼、d11B以及溶解性有机碳的孔隙水浓度-深度分布特征，其中溶解性有机碳以325 nm处吸光度（黄色物质：Yellow Substance, YS）和激光诱导荧光（laser-induced fluorescence, LIF）进行表征。本研究是对大洋钻探计划（Ocean Drilling Program, ODP）第131航次期间开展的大规模船基孔隙水分析项目的后续研究。本次研究所涉及的多数组分，均与该类沉积物中有机质的成岩作用过程密切相关。
由于引发浓度变化的地质过程存在差异，本文将沉积物柱的三个区域分别进行讨论：
1. 上部数百米区间：该区域沉积速率极高（>1200米/百万年，million years, m.y.），孔隙水的碱度、氨、碘化物、溴化物、YS以及LIF浓度均出现急剧升高，这一现象主要由有机碳的成岩作用所导致；
2. 在海底以下200米（meters below seafloor, mbsf）以深区域，浓度梯度整体呈下降趋势，而约365 mbsf处的区域则表现为浓度反转特征，这主要是因为逆冲断层作用使得深部沉积物在该深度之上发生了近期就位；
3. 滑脱带（décollement zone，945-964 mbsf）的特征是多种组分（溴化物、硼、d11B、锰、LIF）出现浓度异常。上述数据被解释为流体沿滑脱带发生平流输入的结果，该平流输入事件的发生时间距今仅约20万年（kiloannum, ka）。目前仍推测异常流体可能仍会沿该滑脱带周期性输入。