GRAIN-SIZE DISTRIBUTION PATTERN OF THE DEPOSITIONAL SEQUENCE IN CENTRAL BADAIN JARAN DESERT AND ITS GENETIC INTERPRETATION
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摘要: 对巴丹吉林沙漠腹地WEDP02孔310.45 m的岩心进行了高分辨率的激光粒度测量,运用Normal和Weibull函数对全孔的粒度分布进行了拟合和组分分离,在结合野外沉积相判断的基础上,将组分的粒径-频率、含量-频率变化作为组分成因分析的依据,系统分析了WEDP02孔沉积序列的粒度组分的成因。结果表明:WEDP02孔沉积物主要以风成砂、湖泊-风成砂混合沉积、冲洪积-风成砂混合沉积为主。风成沉积物中,超细粒成壤、高空远源粉尘、低空近源粉尘、风成砂与风成粗砂组分的粒径界线为2、12、105和270 μm,粉尘与风成砂组分的比例平均值为20%/80%,在粒度组分的粒径-含量投影图中占据右上角部分;湖相沉积物中超细粒化学、悬移及风成砂组分的粒径界线为4、45、150~230 μm,湖相悬移组分含量大于35%,同时可含有风成组分和湖相砂,在粒度组分的粒径-含量投影图中占据细粒下部分;冲洪积超细粒化学、悬移黏土、悬移粉砂、风成砂、冲洪积砂的粒径界线为2、12、80、150~200和300 μm。这些特征反映了巴丹吉林沙漠不同沉积物的沉积学特征,是沉积物成因分析的粒度依据。Abstract: Grain size of the samples taken from the drilling hole WEDP02 in the central Badain Jaran Desert are analyzed with the high-resolution laser grain size instrument of Mastersize 2000. Normal or Weibull function is adopted to fit the measured grain-size data, and simultaneously to extract numerical grain-size components. Upon the comparison made with the field observation of sedimentary facies, grain size-frequency and proportion-frequency plots for all the components are used as evidence for genetic analysis. Results suggested that the sequence of the Hole WEDP02 is dominated by aeolian sand, mixed aeolian and lacustrine sediment, and mixed aeolian and alluvial sediments. In the aeolian deposits, such components as the pedogenic product, long-term suspended dust, short-term suspended dust, aeolian sand and coarse aeolian sand are changing around the modal size of 2,12,105,270μm,and the dust and desert sand ratio changing around 2:8. They all lie on the top right corner of the size-proportion plot; In the mixed lacustrine depositional system, however, the boundaries among the chemically suspended fine clay, suspended coarse clay and aeolian sand are located at 4,12,45,150-230μm respectively, and the lacustrine suspension components may reach 35% of the total proportion, thus they occur on the bottom of the size-proportion plot. In alluvial sediments, boundaries of are 2,12,80,150-200,300μm are visible. This case indicates that grain size components could be used as a efficient tool for genetic analysis.
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Key words:
- grain-size /
- numerical parting /
- WDDP02 /
- Badain Jaran Desert
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