A sediment core (ABP24/05), collected at a water depth of 3520 ​m from the southeastern Bay of Bengal was studied to determine the change in chemical weathering during the last glacial to deglacial periods and the factors of sedimentary environment which controlled earliest diagenetic changes in the sediment after its deposition. High ratios of K/Rb, Ti/Al and Zr/Rb during ~45 to ~18 ​cal ​kyr B.P. in the core sediments may be attributed to the stronger physical erosion and turbidity currents activity during this period. This might have brought a higher quantity of unaltered minerals to the study area. Low ratios of K/Rb, Zr/Rb, and Ti/Al and increase of SiO₂/TiO₂, Rb/Al and Cs/Al from ~18 ​cal ​kyr B.P. to present may be indicating an increase in the rate of chemical weathering during this period. The time of increased chemical weathering in the study area is consistent with deglaciation warming in the tropical Indian Ocean and strengthening of river runoff into the Andaman Sea. Climate change during the interglacial period by increased solar insolation thereby strengthened the summer monsoon which might have led to intensified chemical weathering in the source region since ~18 ​cal ​kyr B.P. The low organic carbon (OC), high Mn/Al, Fe/Al and the Mn-oxides minerals precipitation indicate prevailing of oxic conditions during ~11 ​cal ​kyr B.P. in the core sediments, which is contradictory to suboxic conditions developed in the deep ocean sediments in the western Bay of Bengal and the equatorial Indian Ocean. The low terrigenous influx and export of less OC to the bottom sediments might have created a favorable condition for the formation of Mn-oxides in the study area during Holocene.

研究了从孟加拉东南湾3520 m的水深处收集的沉积物核（ABP24 / 05），以确定在最后一个冰期至冰期期间化学风化的变化以及控制最早成岩作用的沉积环境因素。在沉积物中沉积之后。在核心沉积物中约45至约18 cal.kyr BP期间，K / Rb，Ti / Al和Zr / Rb的高比率可能归因于此期间较强的物理侵蚀和浊流活动。这可能为研究区域带来了更多的未改变矿物。K / Rb，Zr / Rb和Ti / Al的比率低且SiO ₂ / TiO _2增加，从〜18 cal kyr BP到现在的Rb / Al和Cs / Al可能表明在此期间化学风化速率增加。研究区域化学风化增加的时间与热带印度洋的冰河变暖以及安达曼海的径流增加有关。冰川间期期间由于日照强度增加而引起的气候变化，从而增强了夏季风，这可能导致源区的化学风化加剧。自约18千卡BP以来低有机碳（OC），高Mn / Al，Fe / Al和锰氧化物矿物质的沉淀表明核心沉积物中约11 cal Kyr BP期间普遍存在有氧条件，这与在孟加拉湾西部和赤道印度洋的深海沉积物中形成的亚氧化条件相矛盾。