中太平洋海盆碳酸钙溶解带及其特征

Calcium carbonate dissolution belt and its character in the mid Pacific Ocean Basin

本文通过对不同水深区沉积物中组分、生物面貌、矿物、ＣａＣＯ３含量和碳酸钙溶解率等特征的分析和对比，把本区碳酸钙溶解深度带划分为碳酸钙溶跃面（小于３７００ｍ）、弱溶带（３７００～４８００ｍ）、强溶带（４８００～５２００ｍ）和全溶带（大于５２００ｍ）。提出本海域碳酸钙补偿深度界面约在５２００ｍ。文中还阐述了不同碳酸钙溶解带及其沉积物特征，认为造成这种特征的主要原因是随着水深变化碳酸钙溶解程度不同以及与南极底层流等因素的影响有关。

The study of calcium carbonate dissolution and CCD bundary is of important signifioance in oceanography and sedimentalogy We made marine scientist surveies and researches in the mid Pacific Ocean from 1985 to 1986, and collected more than 30 surface sediments samples These samples had been analysed and studied Bain on the analytic datas of marine Organisms, grain size, mineral and CaCO 3 content etc, in the sediments, the calcium carbonate dissolution belts in this area can be divided into Lysocline (<3700m), weaking dissolution belt (3700￣4800m) and strong dissolution belt (4800￣5200m) Auther considered that the CCD bundary in the mid Pacific Ocean Basin is about 5200m, and pointed that main factors controlling variation of the calcium carbonates dissolution are water depth, biological productivity and Antarctica bottom current