江北砾岩沉积特征及形成环境研究  

Research of Sedimental Characteristics and Diagenetic Environment of Jiangbei Conglomerate

作　　者：何多兴[1] 谢世友[1] 邹晓红[1] 李俊云[1] 夏凯生[1] 

机构地区：[1]西南大学资源环境科学学院

出　　处：《西南师范大学学报（自然科学版）》2006年第1期142-146,共5页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(40231008);重庆市科委研究资助项目(20027534200482582005AB7006)

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.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 13^C analyse its cemented material on the basis of the research clone 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 Jiang-bei conglomerate, while under arid and cold climate during the relative late period, the evaporation action on the water super saturated or rich in Ca^2＋ to the cement process of Jiangbei conglomerate.

关 键 词：14^C U-Th ESR Δ^13C 沉积特征 成岩环境 江北砾岩 

分 类 号：P588.2[天文地球—岩石学]