%0 Journal Article
%T Quartz grain Surface Characteristics of Sediments from the Zanda Basin of Tibet and Their Environmental Significance<br>西藏札达盆地沉积物的石英砂表面特征及其环境意义
%A 韩建恩
%A 余佳
%A 孟庆伟
%A 吕荣平
%A 朱大岗
%A 孟宪刚
%A 邵兆刚
%A 杨朝斌
%J 地球学报
%D 2009
%I 
%X The quartz grain surface structural characteristics of the strata in Xiangzi, Guge and Tuolin Formations of Zanda basin were studied under scanning electron microscope. The quartz grains of the three formations are poorly rounded, and the quartz grains are mainly in sharp-edged and subangular forms. Taking into account regional geology, the authors hold that the sedimentary provenance of the basin was very close to the basin subsidence area, being the mountainous area surrounding the basin. The sand surface of Upper and Middle Xiangzi Formation shows clear glacial characteristics, suggesting that the sedimentary environment was a shallow water periglacial river-lacustrine area. The existence of corrosion pits and trenches in the grains suggests that the sedimentary environment of Lower Xiangzi Formation was a deeper water periglacial river-lacustrine area. The quartz grain particle surface of Guge Formation assumes low chemical energy of lacustrine facies. The surface of quartz grain in Tuolin Formation shows characteristics of fluvial sedimentary facies.
%K Zanda Basin
%K quartz grain
%K surface texture
%K sedimentary environment
%K Tibet<br>札达盆地
%K 石英砂
%K 表面结构
%K 沉积环境
%K 西藏
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=1DF69A47DE80569EC8F859DF61571180&aid=0708514DFA1127939333B1D392ED6830&yid=DE12191FBD62783C&vid=340AC2BF8E7AB4FD&iid=94C357A881DFC066&sid=7004BE6E41AAF52C&eid=4E8E6A5CE04FD382&journal_id=1006-3021&journal_name=地球学报&referenced_num=0&reference_num=30