为了定量研究碳酸盐岩压实量,通过对大巴山断褶带下三叠统野外露头鲕粒灰岩样品,以及其中的鲕粒形态的观察与研究,认为样品中鲕粒的碟状形态是压实(压应力)作用所形成的,而且鲕粒的这种碟状形态是确认鲕粒灰岩压实作用最直观、最可靠的依据.探讨了不同成因的异形鲕粒的鉴别方法,提出了用压实变形的鲕粒来定量评价压实量的方法.考虑到鲕粒在开始变形以前还会存在一定的压实,样品中的鲕粒灰岩的最小压实量可达41.7,.

We select the oolitic outcrops of the Lower Triassic Feixianguan Formation in Dabashan fault zone to explore the compaction calculation of carbonate rock. Through the observation of oolitic morphology in the sample, it is considered that the discoid shape of the oolitic is formed by compaction(compressive stress), that is, the discoid form of the ooid can be used as the most intuitive and reliable basis for compaction. Based on the identification of heterogeneous ooid of different genesis, the method of calculating the compaction quantity by using the crushed ooid is put forward, and the compaction amount is obtained by measuring the amount of oolitic deformation. Considering that the compaction before the start of the oolitic deformation is difficult to estimate, this calculation is actually the minimum compaction of oolitic limestone in the sample, up to 41.7,. This method provides a useful idea.