Magnetism of drilling coral reef and coral clast from yongshu atoll of nansha islands , southern south china sea 南沙群岛永暑礁钻井珊瑚礁和珊瑚碎屑的磁学分析
2.
The formation of a tight syncline in the tuchengzi formation is depicted accurately . 3 . there are three main clast types in the conglomerate : andesite , limestone , and dolomite 4 、确定了土城子组砾岩中的三种主要砾石成分(安山岩、灰岩和白云岩砾石)的来源。
3.
By the application of the method in eighteen wells in the western depression of sichuan basin , it achieves good effect in the recognition of low permeability and low porosity tight clast of the western depression of sichuan basin 通过对川西坳陷十八口井的实际应用，此方法在低孔低渗的致密碎屑岩岩性划分中取得了良好的效果。
4.
The tuchengzi formation mainly consists of carbonate ( limestone and dolomite ) clast conglomerate characterized by poorly sorted and poorly rounded clasts , which shows that the deposition of the tuchengzi formation is closely associated with late jurassic tectonism 砾岩的成分和结构成熟度都表明它的形成与剧烈的构造活动紧密相关，是研究区内晚侏罗世时期强烈构造变动的沉积记录。
5.
The mineral rock - silica rock mostly composes of three kinds of silica qualities , and the first structure jasper silica rock , the second icrocrystal quartzite , the third the quartz grain clast . cement is carbonate , contain a little amount carbonate loach . silica rock , commonly assume edge angle or hypo - edge angle 区内的含矿岩石?硅质岩主要由三种硅质成分构成，第一种为显脱玻?霏细结构的碧玉质硅质岩，第二种为微晶石英岩，第三种为石英颗粒内碎屑。
