【摘 要】
：
利用粉晶X射线衍射(XRD)和等离子体直读光谱(ICP-AES)分析技术,对黄土高原洛川和西峰剖面黄土层位蜗牛壳体进行研究.结果表明现代蜗牛壳矿物成分为文石,而在一定层位中部分蜗
【机 构】
：
河海大学科学研究院同位素水文研究所,南京大学成矿作用国家重点实验室、地球科学系表生地球化学研究所,南京大学成矿作用国家重点实验室、地球科学系表生地球化学研究所,南京大学成矿作用国家重点实验室、地球科学
论文部分内容阅读
利用粉晶X射线衍射(XRD)和等离子体直读光谱(ICP-AES)分析技术,对黄土高原洛川和西峰剖面黄土层位蜗牛壳体进行研究.结果表明现代蜗牛壳矿物成分为文石,而在一定层位中部分蜗牛壳体文石转变为方解石.洛川剖面和西峰剖面的蜗牛壳体文石向方解石转变的地层界线出现在L5和L6间.地表条件下,温度只在很长时间尺度内对蜗牛壳文石相变起作用,压力不是造成蜗牛壳文石相变的因素,形成时间可能是相变的首要因素;在此基础上,相变的程度可能还受蜗牛壳中微量元素所控制,微量元素含量较高使蜗牛壳文石的稳定性提高,阻碍其向方解石转变,而微量元素较低的蜗牛壳相变程度较高.
The results show that the mineral composition of the modern snail shell is aragonite, and the mineral composition of the modern snail shell is aragonite , While some snail shell aragonite turns into calcite in a certain horizon.Luochuan section and Xifeng section snail shell aragonite to calcite transition strata boundary appear between L5 and L6.The surface conditions, the temperature is only very On a long time scale, the aragonite aragonite phase transformation function, pressure is not the cause of aragonite aragonite phase transformation, formation time may be the primary factor of phase transition; on this basis, the degree of phase change may also be affected by the snail shell Under the control of trace elements and trace elements, the stability of snail shell aragonite increased, hindering its transformation to calcite, and the lower trace element Snail shell phase transition higher.
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