Visual estimates of carbonate particles and coccolith abundance at DSDP Hole 75-530A

The upper Albian to Coniacian section (Cores 105 to 89) at Site 530 contains rare and poorly preserved coccoliths at a few levels and fine-fraction carbonate ("micarb") at all the levels studied. Dissolution ranking of the most resistant coccolith species is possible. Changes in the dissolution intensity resulting from variations in the organic carbon and carbonate input seem a likely explanation for changes in the relative abundance of fine-fraction carbonates types.

530站位105号至89号岩心所涵盖的阿尔布阶上部至科尼亚克阶地层，在少量研究层位中可见稀少且保存状态欠佳的颗石（coccolith），所有被分析的研究层位均发育细粒级碳酸盐（"micarb"）。可对抗溶蚀能力最强的颗石物种进行溶蚀分级。由有机碳与碳酸盐输入量变化所引发的溶蚀强度差异，似乎能够解释细粒级碳酸盐类型相对丰度的变化。