绿洲沉积特征及沉积模式  

Characteristics of Oasis Sedimentation and Sendimentary Model

作　　者：穆桂金[1] 陈冬梅[1] 

机构地区：[1]中国科学院新疆生态与地理所,乌鲁木齐830011

出　　处：《干旱区地理》2005年第1期1-5,共5页Arid Land Geography

基　　金：中国科学院新疆生态与地理研究所创新领域前沿项目(KZCX-X501-02);国家重大基础研究发展规划项目(TG1999043502)成果

摘　　要：绿洲沉积是指在绿洲生物发育、演化的环境中无机和有机物在地表和近地表层的沉积或沉淀作用。绿洲沉积是绿洲物质循环过程的重要环节,其沉积物不仅记录了物源组成、介质性质、能量状态及动力特征等,还记录了绿洲环境变化的大量信息。沉积物的颜色、组构、组成等方面表明绿洲沉积是可识别的。通过研究绿洲沉积,可以揭示绿洲物质循环、认识绿洲环境演变、解析绿洲对全球变化的响应,为绿洲低耗、高效、可持续发展理论模式的构建和技术创新提供科学依据。Oasis sedimentation is a depositional process of organic and inorganic matters at the surface orsubsurface of oasis vegetation-covered lands. The substances produced by oasis sedimentation are oasis deposits,and the layer composed of oasis deposits is oasis deposit layer. Oasis sedimentation is an important process of thecirculation of oasis substances. Oasis deposits record not only the characteristics of composition, properties of themedia, state of medium energy and dynamics, but also a large quantity of information of oasis-environmentalchanges. Oasis stands for a true type of in situ environment, but simultaneously, it also very sensitively respondsto the regional or global environmental change. Therefore, oasis deposits are as significant as lacustrine depositsor aeolian deposits in post climatic and environmental changes. Oasis deposits are recognizable by their color, texture, structure and composition at a profile. Most popularly,oasis deposits settle at the fluvial sediments composed of sandy materials with beddings. The initial layers, whichare distributed in lower, commonly presents flooding trace, and then the upper layers are with more evidences ofbio-process. Organic-rich or peat layers are as result of typical natural oasis-biogenic sedimentation.Correspondingly, man-made oasis deposits are also a vital part of the oasis sediments that includeirrigation-genetic deposits, engineering deposits and dumping deposits. Horizontally, characteristics of naturaloasis deposits vary with the patch-patterns of oasis, and form micro-facies with more complex boundary, whichresult from sedimentary medium and its energy properties, supplying direction, properties and richness, and redoxenvironments. Furthermore, it is the multi-assembles of natural sediments and artificial ones to build variableoasis landscapes and to record rich signal of environment changes. Study on the oasis deposits will provide a newvaluable perspective to comprehend the oasis environmental change in the past, make the oasis substancecircul

关 键 词：绿洲 沉积特征 沉积模式 组构 物源 近地表 沉积物 技术创新 可持续发展理论 信息 

分 类 号：P512.2[天文地球—地质学]