【摘要】 采用14C、U系法、ESR等定年技术、基质碳同位素分析等多种手段对江北砾岩沉积特征和成因进行了研究,发现:晚更新世晚期全球总的干冷气候下的相对暖湿期是江北砾岩沉积的的主要时期,而胶结成岩则为相对较晚时期的干冷气候条件下,由于蒸发作用钙过饱和或外来富钙水的加入胶结成岩.更多还原

【Abstract】 Jiangbei conglomerate is a kind of allothigenic supergene cemented rock that widely spreads in lower terrace of Quaternary sediment along the river in Sichuan basin and it’s adjacent area,and consists of conglomerate and sandstone.Jiangbei conglomerate has its own characteristic different from other river sediment,namely it cemented to solid rock on earth’s surface and only spread on the lower terrace.But there are different opinions about its diagenetic reasons.This paper studes its diagenetic environment reasons by carbon 14,ESR,U-Th dating method and δ(¹³C) analyse its cemented material on the basis of the research done before.The authors draw a conclusion that in the general arid and cold climate of earth during the last stage of late Pleistocene the relative warm and wet period is the major sediment stage of Jiangbei conglomerate,while under arid and cold climate during the relative late period,the evaporation action on the water super-saturated or rich in Ca²⁺ led to the cement process of Jiangbei conglomerate.更多还原