Infrared Spectroscopy, Portable XRF and Magnetic Susceptibility Analysis of Drill Core for Exploration of the Taihe Vanadium Titano-Magnetite Deposit in the Panxi Area, Sichuan Province
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摘要:
近年来，红外光谱技术因其可以绿色、快速、无损、精确探测矿物和提高勘查效率而备受关注。攀西超大型太和钒钛磁铁矿床位于镁铁质-超镁铁质层状岩体中，该矿床的典型矿物的红外光谱特征研究相对缺乏，制约了勘查效率的提高。本文应用便携式傅里叶变换红外光谱仪对四川太和钒钛磁铁矿床钻孔ZK1307岩心开展热红外光谱测试工作，并辅以便携式X射线荧光光谱（XRF）元素含量分析和磁化率值的综合分析，参考岩心编录情况，分析研究了钻孔岩性-矿物组合-元素含量-磁化率之间的对应关系。研究表明：热红外光谱可以实现快速、无损对辉石特征吸收峰的信息提取，识别含磁铁辉石岩体分布范围，快速界定含矿岩体；太合矿床Fe、Ti、V元素含量可以用磁化率值进行线性拟合，较高的Fe、Ti、V金属元素含量和磁化率值可作为判断地质体矿化的指示信息。
Abstract:BACKGROUND The Panxi super large-scale Taihe vanadium-titanium magnetite deposit is located in the mafic-ultramafic layered intrusions. Research on the characteristics of infrared spectroscopy of the typical minerals of this deposit is relatively lacking, restricting exploration efficiency. The Panxi area would benefit from the use of infrared spectroscopy technology, which in recent years has attracted much attention because of its green, fast, non-destructive and accurate detection of minerals, and improvement of exploration efficiency.
OBJECTIVES To analyze the characteristics of different minerals and to efficiently identify ore-bearing intrusions and mineralized regions in the Taihe vanadium titano-magnetite deposit in the Panxi area, Sichuan Province.
METHODS Minerals were identified using Handheld FTIR through thermal infrared (TIR). The contents of Fe, Ti, and V were analyzed by Vanta VMW portable XRF. The magnetic susceptibility was analyzed by KM-7 portable magnetic susceptibility tester. Based on the core catalog, the relationship between borehole lithology, mineral assemblage, element content, and magnetic susceptibility value was studied.
RESULTS TIR can be used to achieve rapid and non-destructive extraction of the characteristic absorption peaks of pyroxene, identify the distribution of magnetite-bearing pyroxenite, and quickly define ore-bearing rock masses. The contents of Fe, Ti, and V in the Taihe deposit can be linearly fitted by magnetic susceptibility values. Different kinds of rocks and ores have different contents of Fe, Ti, V and magnetic susceptibility value.
CONCLUSIONS TIR technology is useful for prospecting magnetite-bearing rocks or deposits in unknown areas. The higher contents of Fe, Ti, and V and magnetic susceptibility values can be used as indicative information for judging the mineralization of geological bodies.
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图 2 太和钒钛磁铁矿床钻孔ZK1307热红外矿物相对含量与岩性、金属Fe-Ti-V元素含量、磁化率、辉石特征吸收峰相对吸收深度信息对比图。其中，8360D、9610D、10050D、10700D分别表示辉石的特征吸收峰的波长在8360nm、9610nm、10050nm、10700nm波段的相对吸收深度
Figure 2.
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