鄂尔多斯东北缘早白垩世冰川泥石流沉积的发现及其成因证据  

DISCOVERY AND ITS GENETIC EVIDENCES OF EARLY CRETACEOUS GLACIAL DEBRIS FLOW IN THE NORTHEAST MARGIN OF ORDOS

作　　者：程守田[1] 李志德[1] 黄焱球[1] 葛利刚 刘星[1] 

机构地区：[1]中国地质大学资源学院,湖北武汉430074

出　　处：《地质科技情报》2002年第2期36-40,共5页Geological Science and Technology Information

基　　金：国家自然科学基金资助项目 (4 9772 118)

摘　　要：冰川泥石流是由冰碛物与冰雪融水混合形成的一种碎屑重力流沉积。综合泥石流的砾石成分、冰川擦痕、冰冻痕、巨型漂砾等及其某些沉积特征和源区地质背景 ,认为鄂尔多斯东北缘早白垩世泥石流沉积为冰川泥石流成因 ,这一发现暗示了晋北隆起在早白垩世曾有山谷冰川存在 。Glacial debris flow is a kind of debris gravitational flow deposits that result from the mix of moraines and ice snow melt water.Based on the synthetic analysis of gravel composition in the debris flow,glacial striation,frost scar,great drift boulders,some other depositional characteristics and geological background of source areas of the debris flow,the authors suggest that the Early Cretaceous debris flow in the northeastern margin of Ordos should be a glacial debris flow.This discovery proposes that there was valley glacial in the Jinbei(north Shanxi Province) uplift during Early Cretaceous time.This is of great significance for the researches on the Cretaceous continental mountain paleo galcial and paleo climate in China.

关 键 词：鄂尔多斯 早白垩世 冰川泥石流 成因证据 晋北隆起 古气候 冰碛物 

分 类 号：P642.23[天文地球—工程地质学] P343.6[天文地球—地质矿产勘探]