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A Preliminary Discussion On the Source of Loessic Material in China——A Study of the Surface Textures of Silt Quartz Grains by Transmission Electron Microscope

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【作者】 卢演俦文启忠黄伯钧闵育顺邓华兴

【Author】 Lu YANCHOU;WEN QIZHONG;HUANG BAIJUN;Mm YUSHUN;DENG HUAXING Institute of Geochemistry,Academia Sinica

【机构】 Institute of Geochemistry Academia SinicaInstitute of GeochemistryAcademia Sinica

【摘要】 <正> Loess of China,regardless of its age,exhibits similarity in the surface texture of siltquartz grains,all of them having conchoidal fractures,flat cleavage planes(or plates),andmechanical cracks,and having been re-worked by silica precipitation and chemical dissolution.Silica precipitation,different-degree chemical etching and dissolution are commonly found onthese grains,indicating that they would be separated from source rocks,such as granites,gneisses,etc.;or they may have been subjected to relatively long weathering in-situ beforetransported to loess-accumulating areas,or they probably underwent diagenesis when broughtinto the sedimentation system,followed by weathering and erosion and then transported toloess-accumulating areas.It is evident from the relationship between loess of China,desertsand Gobis,and loessic composition and its regional distribution that Mesozoic-Cenozoic landdetrital sediments widely spread in the Ordos and Alashan regions are the principal sourceof loessie material in China.

【Abstract】 Loess of China,regardless of its age,exhibits similarity in the surface texture of silt quartz grains,all of them having conchoidal fractures,flat cleavage planes(or plates),and mechanical cracks,and having been re-worked by silica precipitation and chemical dissolution. Silica precipitation,different-degree chemical etching and dissolution are commonly found on these grains,indicating that they would be separated from source rocks,such as granites, gneisses,etc.;or they may have been subjected to relatively long weathering in-situ before transported to loess-accumulating areas,or they probably underwent diagenesis when brought into the sedimentation system,followed by weathering and erosion and then transported to loess-accumulating areas.It is evident from the relationship between loess of China,deserts and Gobis,and loessic composition and its regional distribution that Mesozoic-Cenozoic land detrital sediments widely spread in the Ordos and Alashan regions are the principal source of loessie material in China.

【关键词】 dissolutionloessquartzaccumulatingsedimentationCenozoicMesozoicweatheringQuartzgrains
  • 【文献出处】 Geochemistry(English Language Edition) ,地球化学(英文版) , 编辑部邮箱 ,1982年03期
  • 【被引频次】1
  • 【下载频次】35
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