Composition, Origin and Weathering Process of Surface Sediment in <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:City w:st="on">Kumtagh Desert</st1:City>, <st1:State w:st="on">Gansu</st1:State> Province, <st1:place w:st="on">Northwest China</st1:place><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

Composition, Origin and Weathering Process of Surface Sediment in Kumtagh Desert, Gansu Province, Northwest China

详细信息

责任者：Xu Zhiwei (School of Geographic and Oceanographic Sciences ; Nanjing University ; Nanjing 210093 ; China) ; Lu Huayu
刊名：Acta Geographica Sinica
出版年：2010
卷期：65(1)
关键词：沙漠 ; deserts ; 甘肃 ; Gansu Province
页码：p.53-64
图表：illus., 4 tables, 51 refs.
分类号：1400
issnNo：ISSN0375-5444
isbnNo：CN11-1856/P

摘要

33 representative surface sediment samples were collected from Kumtagh Desert and analyzed in the laboratory to obtain composition of heavy mineral and content of geochemical elements. Results show that there are various kinds of heavy minerals in these samples, with large content of epidote and hornblende. All elements except Si and Ca are depleted to a certain degree. Mineral composition of the samples of the Kumtagh Desert has a similarity with that of rocks of Altyn Tagh, surface sediments of the alluvial/fluvial fans of the Aityn Tagh and that of the Taklamakan Desert, indicating that one major source of the Kumtagh Desert sediments is located in Altyn Tagh. A-CN-K ternary diagram shows that a weak chemical weathering by loss of Na and K occurred in these sediments, while other geochemical elements was in a less weathering or leaching process.

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