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三、古海洋学的主要成就2.海洋化学环境的变化洋底沉积物的地球化学研究,可以有助于阐明海洋的化学环境,表层生物生产力(肥力)以及表层和底层环流的变化,在海洋地球科学上具有十分重要的意义.(甲)方解石补偿深度(CCD)及CaCO_3含量的变化 CCD指进入海底的CaCO_3供给量被溶解量所平衡的水深,它是洋底钙质沉积物与非钙质沉积物间的岩相界线.CCD的水深是CaCO_3供给率与溶解率的函数,受多种因素的影响,如上层海水的肥力、深层海水的碱度、CO_2含量,以及海水与沉积物界面上的水流流速等,是一个复杂的问
III. MAJOR ACHIEVEMENTS OF PALEOCEANOGRAPHY 2. CHANGE IN THE OCEAN CHEMICAL ENVIRONMENT Geochemical studies of ocean floor sediments can help elucidate the chemical environment of the oceans, the surface bio-productivity (fertility), and the changes in surface and bottom circulation, Earth science has very important meanings. (A) Calcite compensation depth (CCD) and CaCO 3 content change CCD refers to the amount of CaCO 3 supply into the sea floor is the amount of dissolved water balance, it is the oceanic calcareous sediments and non-calcium Sedimentary facies lithofacies boundaries.CCD water depth is a function of CaCO_3 supply rate and dissolution rate, influenced by many factors, such as the upper sea water fertility, deep sea alkalinity, CO_2 content, as well as seawater and sediment interface On the flow of water, etc., is a complicated question