内蒙古扎木敖包铁、石墨矿床钻孔样品的NIR和XRD分析

NIR and XRD Analysis of Drill-Hole Samples From Zhamuaobao Iron-Graphite Deposit,Inner Mongolia

近年来,科学技术的发展让越来越多的测试技术得以适用于地质领域。相比于采用一种测试技术来解释某些地质问题,地质工作者们开始尝试采用多种测试技术优优结合的方法来提高研究的准确度。综合近红外光谱分析(NIR)和X射线衍射分析(XRD)两种现代测试技术,对扎木敖包矿床4202钻孔线不同层位采取的9个岩心样品进行测试分析,并对两种测试技术的测试结果进行比对和总结。结果表明,不同层位上的矿物成分存在着一定的差异,从上至下不同层位的岩性分别为:第四系、第三系粘土砂砾层-泥岩-云母石英片岩-石英阳起石矽卡岩-矽卡岩化大理岩-铁矿矿层-石墨矿层-云母石英片岩。不同深度的岩石成因上亦有所不同,主要发生了风化、碳酸盐化、绿泥石化及矽卡岩化的作用。研究结果一方面可以完善该矿区的地质特征,另一方面对于该区的勘矿、找矿及采矿亦有重要意义。此外,由于XRD可以初步提供矿物成分信息,NIR则可以在XRD测试数据基础上进一步判断矿物存在与否,综合NIR和XRD的优点,采用两种现代测试技术相互结合的方法,较好地识别出样品中的矿物组成,提高了矿物成分鉴定的准确度。同时也表明在矿物光谱学的基础上,NIR将会更加广泛地应用于地学领域。

The author analyzed the 4202 drill-hole samples from Zhamuaobao iron-graphite deposit by using near infrared spec-troscopy（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 lay-ers ,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 ge-ological 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＆amp;nbsp;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 .