[The Significance of Analysis of Soil from the Surface of Hetao Plain, Inner Mongolia with Near Infrared Spectra].

The technology of near infrared spectrum, marked by its convenience and effectiveness, which has been applied extensively in lithological analysis, is suitable for component analysis of regional geology, due to its superiority in analyzing numerous samples in a relatively short time. Since different mineral molecule peaks will show different characters when being analyzed in the near infrared spectrum, we can acquire the information about the mineral composition, water content, mineral crystallinity and etc. In this passage, the soil from the surface of Hetao Plain has been analyzed, and in this case, we can obtain the information about the mineral composition, water content, mineral crystallinity and etc. Referring the features of local environment and climate, we could surmise the source of the minerals in soil and the environment where they formed. The result not only consummates the geological characterization of Hetao area, but also has great significance revealing mechanism of soil-formation in Hetao area. The result shows that the soil from surface of Hetao Plain is mainly composed by altered minerals, such as kaolinite, smectite, ledikite, muscovite etc, and is presumed to be from acidic rock mass of the Yinshan mountains. The passage also indicates that the Yinshan mountains have great impact on the formation of the soil on Hetao Plain in the aspect of climate, for example, though the climate of inner Mongolia is continental arid climate, enough rainfall and the substantial differences in mean annual precipitation ensure the relatively moist environment in this area, and make the sediments altered adequately, proposing new aspects about exploring the mechanism of the soil-formation in Hetao area.

[NIR and XRD analysis of drill-hole samples from Zhamuaobao iron-graphite deposit, Inner Mongolia].

The author analyzed the 4202 drill-hole samples from Zhamuaobao iron-graphite deposit by using near infrared spectroscopy(NIR) and X-ray diffraction(XRD) measuring and testing techniques, and then compared and summarized the results of two kinds of testing technology. The results indicate that some difference of the mineral composition exists among different layers, the lithology from upper to deeper is the clay gravel layer of tertiary and quaternary, mudstone, mica quartz schist, quartz actinolite scarn, skarnization marble, iron ore deposits, graphite deposits and mica quartz schist. The petrogenesis in different depth also shows difference, which may indicate the geological characteristic to some extent. The samples had mainly undergone such processes as oxidization, carbonation, chloritization and skarn alteration. The research results can not only improve the geological feature of the mining area, but also have great importance in ore exploration, mining, mineral processing and so on. What's more, as XRD can provide preliminary information about the mineral composition, NIR can make further judgement on the existence of the minerals. The research integrated the advantages of both NIR and XRD measuring and testing techniques, put forward a method with two kinds of modern testing technology combined with each other, which may improve the accuracy of the mineral composition identification. In the meantime, the NIR will be more wildly used in geography on the basis of mineral spectroscopy.