中文摘要：

斯里兰卡国普塔勒姆地区滨海沉积物中发育钙质结核，其与我国黄海和东海钙质结核在成分、结构、构造和古生物化石等方面均存在差异。该地区钙质结核含有大量的海相生物化石及其碎屑，CaO的含量＞44.14％,SiO2的含量＜12.75％，与同地区的碳酸盐软泥相比，结核相对富铁贫硅和富锶贫钡，说明生物对结核的影响大于对碳酸盐软泥的影响。结核的碳、氧同位素值负偏明显，δ^13C＜-4.54‰，，δ^18O＜-6.37‰，具有轻碳轻氧的特征。结核的矿物成分、古生物化石、主微量元素和碳、氧同位素资料说明其形成于海相环境，后期因海平面下降，受到大气淡水和地下水的影响，元素含量发生变化，形成颇具特色的钙质结核。

英文摘要：

Calcareous concretions which were found in coastal sediments in Puttalam of Sri Lanka were different from those calcareous concretions of Yellow Sea and the East China Sea in the composition,structure,texture and fossils etc. Calcareous concretions of this area contain abundant marine fossils and their fragments. The CaO content in the calcareous concretions is more than 44.14% and SiO2 is less than 12.75%. Compared with carbonate ooze,the calcareous concretions have a higher Fe and Sr content and a lower Si and Ba content, which indicated that in the forming process of calcareous concretions, biological effects in calcareous concretions were more important than that in carbonate ooze. The carbon and oxygen isotopes of calcareous concretions both display a negative excursion obviously（δ^13CV-PDB〈-4.54‰,δ^18OV-PDB〈-6.37‰）. The minerals,fossils,elements,carbon and oxygen isotope data indicated that calcareous concretions were formed in the marine environment. When sea-level fall later, the calcareous concretions were dissolved under influence of meteoric fresh water,groundwater and the elements exchange between calcareous concretions and fresh water. Finally,a large number of distinctive holes were formed in the calcareous concretions.