碳酸鹽補償深度(英語:carbonate compensation depth)是指海洋中碳酸鈣輸入海底的補給速率與溶解速率相等的深度面,也是海底含碳酸鹽的沉積和非碳酸鹽沉積之間的岩相界面[1][2]。海水錶層碳酸鈣是飽和的,隨着水深的增大,水壓增高,水溫降低,海水中的二氧化碳含量增高,碳酸鈣溶解度增大,在碳酸鹽補償深度溶解量與補給量相抵平衡[3][4]

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