毛乌素沙地中部风成沙的组成与微形态特征
陈国祥;  董治宝;  崔徐甲;  肖巍强;  李露露;  杨军怀;  石唯康
2018-06-14
其他题名Composition and Micro-morphological Characteristics of Aeolian Sand in the Middle of the Mu Us Sandy Land
卷号38期号:3页码:473
摘要分析了毛乌素沙地中部流动沙丘与固定-半固定沙丘沉积物粒度、元素和微形态特征。结果表明:流动沙丘沙和固定-半固定沙丘沙均以细沙和中沙为主,流动沙丘沙的分选性较好,而固定-半固定沙丘沙的分选性较差,沙丘在频繁强烈的风沙活动环境下跃移搬运,且搬运方式一定,搬运动力稳定。与上部陆壳平均化学组成(UCC)相比,常量元素SiO2和Na2O富集,其余均亏损,而微量元素中,Co富集明显。沙丘沙物质CIA值与上部陆壳平均值接近,表明沙丘经历了低等的化学风化。流动沙丘和固定-半固定沙丘颗粒磨圆度普遍较差,大多呈现棱角状或次棱角状外形,真正圆状外形较少。风成环境的典型标志碟形撞击坑占比很大,推断毛乌素沙地中部气候相对干燥,机械作用占主导地位,化学风化作用甚微。
其他摘要In this paper;the grain size;element and micro-morphological characteristics of mobile dune and fixed/semi-fixed dune in the middle of the Mu Us Sandy Land are analyzed. The results show that both the mobile dune and the fixed/semi-fixed dune are composed of fine sand and medium sand;while the sorting of mobile dune is better;and the sorting of fixed/semi-fixed dune is poor. The transport style of dunes is saltation in a frequent and strong wind activity environment;and the way of transportation is fixed and the power of transportation is stable. Compared with UCC;SiO2 and Na2O are rich in major elements;others are loss;and Co is enriched obviously for trace element. Values of CIA of dunes are close to the average of the upper continental crust;indicating that the dune has experienced a low degree of chemical weathering. The roundness of mobile dune and fixed/semi-fixed dune is poor;and most of them are angular shape or sub-angular shape;and the real round shape is less; The typical mark of the windy environment is dish-shaped pits accounted for a large proportion;and it is inferred that the climate of the Mu Us Sandy Land is relatively dry;the mechanical action occupies a dominant position while the chemical weathering plays a small role.
关键词微形态 沉积物 粒度 地球化学元素 毛乌素沙地
DOI10.7522/j.issn.1000-694X.2017.00066
语种中文
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条目标识符http://119.78.100.147:8080/handle/2SELTVKS/53256
专题骨干期刊_中国沙漠
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陈国祥;董治宝;崔徐甲;肖巍强;李露露;杨军怀;石唯康. 毛乌素沙地中部风成沙的组成与微形态特征[J],2018,38(3):473.
APA 陈国祥;董治宝;崔徐甲;肖巍强;李露露;杨军怀;石唯康.(2018).毛乌素沙地中部风成沙的组成与微形态特征.,38(3),473.
MLA 陈国祥;董治宝;崔徐甲;肖巍强;李露露;杨军怀;石唯康."毛乌素沙地中部风成沙的组成与微形态特征".38.3(2018):473.
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