天水、秦安新近系红土、湖相沉积物的碳酸钙含量均随岩性变化而变化,红色层的CaCO3平均含量维持在6%～7%之间,钙质层的CaCO3平均含量多在20%～40%之间,高值可达60%以上。对比分析表明,黄土的碳酸钙含量高值仅在20%左右,两者相差悬殊。因此,红土与黄土应是不同气候环境下的产物。在此基础上,作者结合周围地区红土的部分沉积学证据对中国北方新近系红土的风成成因提出质疑并明确今后可能的解决途径。 The contents of CaCO3 in lateritic and lacustrine sediments in Tianshui and Qin’an all changed with the changes of lithology. The average content of CaCO3 in red layer was between 6% and 7%, and the average content of CaCO3 in calcareous layer was more than 20% ~ 40%, high value up to 60%. The comparative analysis shows that the high content of calcium carbonate in loess is only about 20%, the difference between the two is huge. Therefore, laterite and loess should be the products of different climatic environments. On this basis, the author combined the evidence of partial sedimentology of the lateritic clay in the surrounding areas to question the origin of the lateritic laterites in northern China and clarify the possible solutions in the future.