Nd, Sr, and Pb isotope data of IODP Site 353-U1443 measured on the detrital clay fraction@en

We produced orbital-scale resolution geochemical records for International Ocean Discovery Program Site U1443 cored with the RV JOIDES Resolution during IODP Expedition 353 in December 2014 in the southern Bay of Bengal. The Sr, Nd, and Pb isotope compositions of the detrital clay fractions were measured using MC-ICP-MS and span across five key climatic intervals of the middle to late Miocene (15.8 – 9.5 Million years ago). Our new radiogenic isotope time series of clays transported to the Ninetyeast Ridge allow us to distinguish tectonic and climatic forcing of monsoon intensity, weathering regime and erosion intensity of the watersheds feeding into the Bay of Bengal.本研究针对2014年12月在孟加拉湾南部开展的国际大洋发现计划（International Ocean Discovery Program, IODP）第353次航次中，由“乔迪斯·决心号”（RV JOIDES Resolution）钻探获取的U1443站位岩心，构建了轨道尺度分辨率的地球化学记录。研究通过多接收电感耦合等离子体质谱（MC-ICP-MS）测定了该站位碎屑黏土组分的锶（Sr）、钕（Nd）与铅（Pb）同位素组成，其时间跨度覆盖中新世中晚期（1580万至950万年前）的5个关键气候时段。本研究针对输送至九十度海岭（Ninetyeast Ridge）的黏土所建立的全新放射同位素时间序列，得以区分调控孟加拉湾流域季风强度、风化模式与侵蚀强度的构造与气候驱动因素。