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引言苏北平原自第三纪以来长期处于构造下沉,接受了一套巨厚的新生代沉积。在晚第四纪时期又受到海侵海退影响,接受了海相或海陆过渡相沉积。本文所研究的样品,取自平原东部的一个钻孔岩心。取样深度为262米,样品主要由灰黄色、灰黑色和棕褐色粘土、粉砂质粘土、粘土质粉砂和砂砾石组成,常含有钙质、铁锰质结核及动植物残体,上部还含泥炭层,底部为片麻岩。通过重矿物分析看出剖面中有三条明显的重矿物含量变化界线,即大约相当于孔深80米
Introduction The northern Jiangsu Plain has been tectonic subsidence for a long time since the Tertiary and accepted a set of huge Cenozoic sediments. In the late Quaternary period, it was affected by the transgressions of the transgressions and transgressions, and accepted the deposition of marine facies or transitional facies of land and sea. The sample studied in this paper is taken from a borehole core in the eastern part of the plain. Sampling depth of 262 meters, the sample is mainly composed of gray-yellow, gray-black and tan clay, silty clay, clayey silt and gravel, often containing calcium, ferromanganese nodules and animal and plant debris, the upper part also Peat layer, bottom gneiss. Through the analysis of heavy minerals, there are three clear boundaries of heavy mineral content in the section, which is about 80 meters