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地球学报  2009 

西藏札达盆地沉积物的石英砂表面特征及其环境意义

DOI: 10.3975/cagsb.2009.05.11

Keywords: 札达盆地,石英砂,表面结构,沉积环境,西藏

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Abstract:

在扫描电镜下对札达盆地香孜组、古格组和托林组地层中的石英砂表面结构特征进行观察,三个组中石英颗粒外形磨圆度均不好,以棱角和次棱角状为主,结合区域地质认为,盆地的沉积物源距离盆地沉降区很近,为盆地周围的山地。其中香孜组的上部和中部冰川砂粒表面特征明显,认为是水体较浅冰缘区河湖相沉积环境;香孜组下部为湖泊水体较深的冰缘区河湖相沉积环境。古格组石英砂颗粒表面具有溶蚀坑和沟,属于低化学能的湖相沉积。托林组则表现出河流相沉积的特点。

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