terrace deposit 中文意思是什麼
terrace deposit
解釋
階地沉積-
O curve of dsdp607 v30 - 97 show that loess began to deposit on the terrace of the yellow river about 1. 20 ma b p, and passed thirteen climatic changes from drier and cooler to warmer and wetter later. the turn of sedimentation from alluvium to loess, an event of transformation from accumulation to down - cut of the yellow river, indicates a sharp tectonic uplift occurred around 1. 2 ma b p. key words : loess - paleosol ; susceptibility ; climatic changes ; tectonic movement ; yellow river ; yangfan section
通過對楊范剖面黃土地層巖性特徵沉積結構質量磁化率和頻率磁化率的分析及與深海氧同位素曲線的對比，劃分了剖面地層，初步確定了黃土沉積始於1 . 20 ma b p ，黃土沉積以來該區發生了13次大的乾冷暖濕氣候變化沉積轉型指示河流強烈加積轉變為河流侵蝕，代表約在1 . 20 ma b p發生過一次強烈的構造抬升事件。
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