论文部分内容阅读
本文通过对黄河中游地区马兰黄土的大面积野外实地考察，系统采样和室内分析测试，并采用质量加权平均的计算方法，给出了较为准确的中国黄土平均化学成分数据．中国黄土相对于下地壳和全地壳较富大离子半径的亲石元素而贫亲铁元素；与上部大陆地壳相比，中国黄土除相对较富Ｃａ．Ｂ而贫Ｎａ、Ｎｂ外，其余绝大多数化学元素的丰度均非常接近甚至几乎相等。由此表明。中国黄土确属典型的上部大陆地壳物质，它不仅为暴露的上部大陆地壳提供了一种理想的天然平均样品，而且中国黄土的平均化学成分完全可以作为上部大陆地壳化学成分的代表而加以应用。
In this paper, the field investigation, systematic sampling and laboratory analysis of Malan loess in the middle reaches of the Yellow River are carried out, and the calculation method of mass weighted average is used to obtain the more accurate average data of Chinese loess chemical composition. Chinese loess is relative to the lithophile elements that are richer in the lower crust and the richer ion radius of the whole earth crust and are depleted in iron elements. Compared with the upper continental crust, the Chinese loess is relatively richer in Ca than that in the upper continental crust. B and poor Na, Nb, most of the other chemical abundances are very close to or almost equal. This shows. The Chinese loess is indeed a typical upper continental crust material. It not only provides an ideal natural average sample for the exposed upper continental crust, but also the average chemical composition of Chinese loess can be used as a representative of the chemical composition of the upper continental crust.