藻鲕变形及定向性的研究

多数人在研究碳酸盐沉积物(岩)的压实作用时往往注重重荷压实作用,对于侧向挤压的压实作用,则注意不够。本文通过对广西田林县浪平甘硐子中上泥盆统藻鲕颗粒灰岩中藻鲕变形及定向性的研究,确认藻鲕的变形及定向并非重荷压实作用的结果,而是三叠纪中期以前的印支—燕山运动的产物。控制藻鲕变形及定向的因素是构造压实作用、早期胶结作用、颗粒成分、重荷压实作用及溶蚀—充填作用等,其中构造压实作用、早期胶结作用及颗粒成分是主要的因素。

STUDY OF ORIENTATION OF ALGAL OOLITES

Most people usually pay more attention to the gravitative compaction when they study the compaction of carbonatesediments than to the compaction from side pressure. By studying algal oolites in algal oolitic grainstone of Middle-Upper Devonian, Gan Dong Zi, Tian Lin, Guang Xi, this article thinks that the changes in shape and direction of algal oolites are caused not by the gravitative compaction but by Yin Zhi (Yan Shan )movement after Middle Triassic The factors controlling the changes in shape and direction of algal oolites are tectonic compaction, early cementation, composition of grains, gravitative compaction, and dissolution-filling etc., of which the tectonic compaction, early cementation and composition of grains are main factors.