安徽淮北平原钙质结核土分布及成因年代研究  

Distribution,age and genesis of cohesive soil containing calcareous nodules in Huaibei Plain of Anhui Province

作　　者：吴道祥[1,2] 曹亚娟[1] 钟轩民 施国军[1] 徐东生[1] 刘秋燕[1] 王国强[1] 

机构地区：[1]合肥工业大学,合肥230009 [2]同济大学地下建筑与工程系,上海200092

出　　处：《岩土力学》2009年第S2期434-439,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.40872190)资助

摘　　要：提出了钙质结核土的概念,并详细研究了安徽淮北平原钙质结核土的分布规律、成因年代以及钙质结核的类型。通过地质调查、试验和勘探,并参阅工程勘察报告和文献资料,分析了安徽淮北平原钙质结核土的埋藏和分布规律,绘制了淮北平原钙质结核土平面分布图及典型地层剖面图。钙质结核土分布在淮北平原河间地块、洼地及黄泛平地上,结核层的埋藏标高与地面标高变化基本一致。在剖面上,从上到下,钙质结核一般为雏形钙质结核、完形钙质结核和钙质硬磐层,其粒径和含量随深度增大而增大,在常年地下水位附近常形成钙质硬磐层;根据14C测定的年龄分析,在剖面上,雏形钙质结核、完形钙质结核和钙质硬磐层三种形态的钙质结核年龄逐渐增大。After proposing the concept of 'cohesive soil containing calcareous nodules',the distribution law,genesis,age and types of calcareous nodules of cohesive soil containing calcareous nodules in Huaibei Plain of Anhui Province are studied in detail.Based on field geology studies,tests,exploration and extensive reference to engineering geological exploration reports and professional literature data,the burial and distribution law of cohesive soil containing calcareous nodules are analyzed;and the plane distribution map and typical strata section maps of cohesive soil containing calcareous nodules are drawn.Cohesive soil containing calcareous nodules mainly distributes in the block between rivers,depression and the Yellow River Flood Plain in Huaibei Plain.The change law of the elevation of the roof of cohesive soil containing calcareous nodules and the ground elevation is basically identical.Calcareous concretions can generally be divided into three forms:embryonic calcareous concretions,mature calcareous concretions and calcareous hard pan.It is pointed out that there are embryonic calcareous,mature calcareous and calcareous hard pan from up to down on profile,the particle size and number of calcareous concretions increase gradually with depth and calcareous hard pan comes to being around the perennial groundwater level.In addition,the radiocarbon ages of embryonic calcareous,mature calcareous and calcareous hard pan gradually increase on profile.

关 键 词：钙质结核土 成因 分布规律 淮北平原 

分 类 号：P597.3[天文地球—地球化学]