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通过测定南海213个表层沉积物样品中的碳酸钙含量,综合分析整个南海海域碳酸钙含量分布特征及其控制因素.结果表明,不同的区域海洋环境,控制表层沉积物中碳酸钙含量变化的因素也不尽相同:大陆架区,碳酸钙含量主要受陆源非碳酸盐物质的稀释作用而较低;大陆坡区,碳酸钙因丰富的物源量、低的陆源物质输入量和弱的碳酸钙溶解作用等因素而呈较高含量;深海盆区,碳酸钙含量因强烈的溶解作用而较低.根据碳酸钙含量在南海整个表层沉积物中的分布趋势,推测南海纬度14°N以北的海域碳酸钙补偿深度(CCD)为3700m左右,纬度14°N以南的海域CCD为4000m左右.Pearson相关分析表明,南海表层沉积物中钙质超微化石对碳酸钙的含量分布具有较高的贡献率.
Through the determination of calcium carbonate content in 213 surface sediment samples in the South China Sea, the distribution characteristics of calcium carbonate and its controlling factors in the whole South China Sea were comprehensively analyzed.The results showed that the factors controlling the change of calcium carbonate content in the surface sediments were different in different regions of the marine environment Are not the same: the continental shelf area, the content of calcium carbonate is mainly due to the dilution of terrestrial non-carbonate substances and lower; Continental slope, calcium carbonate due to rich source, low import of terrestrial material and weak calcium carbonate Dissolution and other factors in the South China Sea. In the deep-sea basin, the content of CaCO3 is lower due to the strong dissolving effect. According to the distribution trend of CaCO3 in the whole surface sediments in the South China Sea, In the sea area, the compensation depth of calcium carbonate (CCD) is about 3700 m and the CCD of sea area south of latitude 14 ° N is about 4000 m. The Pearson correlation analysis shows that the calcareous nanofossils in the surface sediments of the South China Sea have a higher content of calcium carbonate Contribution rate.