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青海湖湖东全新世风成沉积物的粒度前处理试验表明:1)去除有机质、碳酸盐对风成砂影响不大,去除有机质、碳酸盐后古土壤粗颗粒含量减少、细颗粒含量增多。2)分散剂对现代流动沙丘砂基本没有影响;对古风成砂影响微弱;在分散剂的作用下,古土壤的分散效果较好,但在G法(去除碳酸盐后加分散剂)和H法(去除有机质和碳酸盐后加分散剂)中分散效果不明显,说明分散剂主要是降低碳酸盐对颗粒的胶结作用。3)超声震荡对风成砂几乎没有影响,浸泡但未进行任何化学处理(A法)的古土壤样品经过超声震荡粗颗粒含量减少,细颗粒含量增多,但是超声震荡对于经过化学处理(去除有机质或碳酸盐或加入分散剂)的古土壤样品影响较小。针对本区风成沉积物,适宜的前处理方法除采用传统的方法(H法)外,风成砂还可以采用A法(浸泡),古土壤还可以采用E法(去除有机质和碳酸盐)或G法。
The particle size pretreatment experiments of the Holocene plutonic sediments in Qinghai Lake show that: 1) removal of organic matter and carbonate have little effect on the aeolian sandstones, the content of coarse particles in the ancient soils decreases and the content of fine particles increases after removal of organic matter and carbonate . 2) The dispersant had no effect on the modern mobile dune sand; the impact on paleontology sand formation was weak; under the action of dispersant, the paleosol dispersion was better. However, in the G method (adding dispersant after carbonate removal) and H method (after removing organic matter and carbonate dispersant) dispersion effect is not obvious, indicating that the dispersant is mainly to reduce the binding of carbonates on the particles. 3) Sonic vibrations had almost no effect on aeolian sand. Paleosol samples immersed in but without any chemical treatment (Method A) were subjected to ultrasonic vibration to reduce the content of coarse particles and increase the content of fine particles. However, for ultrasonic treatment, after chemical treatment (removal of organic matter Or carbonate or dispersant) paleosol samples have less effect. For the aeolian sediments in this area, the suitable pretreatment methods include the traditional method (method H), the method A (soaking) for aeolian sand, the method E (organic matter and carbonate removal) ) Or G method.