中文摘要：

目前对于海洋沉积物中碳酸盐粒度分布的测试方法还较少，而传统的光学鉴定与统计的方法较费时、费力。根据激光粒度仪测量原理，使用Malvern 2000型激光粒度仪对采自硫球海沟的柱状沉积物中的碳酸盐含量和粒度分布进行了测定。结果表明，对于碳酸盐含量较高的（〉15％）海洋沉积物样品，通过对去碳酸盐前后沉积物样品的测定，能较好地获得沉积物碳酸盐含量和粒度分布的相关资料和数据，与传统的测量方法相比，其可信度较高。研究证明，此种测试方法我们提供了一种快速、有效地测试深海沉积物碳酸盐含量和粒度分布的手段。

英文摘要：

The methods on determining the carbonate grain-size distribution have not been well developed up to date, although it is a useful parameter for paleographyic study. In the light of the principle of laser grain-size analyzing （ LGA ） method, we used the Malvern 2000 type LGA to measure and calculate the carbonate content and grain-size distribution in A37 core sediments taken from theRyukyu Trench. The results showed that the carbonate content and grain-size distribution data could be achieved successfully through analyzing the original and decarbonated deep sea sediment samples. The carbonate content of the sediments is suggested to be more than 15 % because of the limitation of the LGA itself. Compared to the ordinary optical method, the present method,supplies us a rapid, effective way to measure the carbonate contents and grain-size distribution for deep-sea sediments.