MIR spectral library

Reflectance spectra collected of rocks and soils in the mid infrared wavelength range (2500 to 6000 nm; MIR) of the electromagnetic spectrum contain fingerprints of a wide range of rock forming and alteration minerals. The MIR is complementary to the visible-near infrared (VNIR; 380 to 1300 nm), shortwave infrared (SWIR; 1300 to 2500 nm), and thermal infrared (TIR; 6000 to 15000 nm) wavelength ranges. However, due to technological challenges with regards to proximal and remote hyperspectral sensing instruments, the MIR has been underutilised with regards to applications in mineral exploration and mining. \nWith the advent of readily commercially available, hyperspectral handheld and drill core sensing instruments, such as portable Fourier transform infrared (pFTIR) spectrometers and the newly developed HyLogger4TM (Corescan Pty Ltd.), reflectance spectra of this relatively unexplored wavelength range become accessible to the mineral resources sector. \nNumerous methods exist for inferring mineralogy from hyperspectral reflectance spectra collected from, for example, drill core or field samples, ranging from automated or semi-automated unmixing algorithms that compare the collected reflectance spectra with a spectral reference library (e.g. https://mineralspectrallibraries.csiro.au/) to scripts targeting specific mineral groups and Gaussian deconvolution. \nThis collection of MIR reflectance spectra aims to help improve the understanding of MIR spectral signatures of rock forming and vector minerals that will underpin the development and testing of methods for inferring, for example, relative mineral abundance, mineral composition, crystallinity, water content and grain size from the MIR wavelength range. The presented MIR reflectance spectra feature associated quantitative and semi-quantitative X-ray diffractometry, measured from various types of samples that were collected from a wide range of geological environments. \n

在电磁波谱中红外（mid infrared, MIR）波段（2500~6000 nm）范围内采集的岩石与土壤反射光谱，蕴含了各类造岩矿物及蚀变矿物的特征指纹信息。该中红外波段与可见光近红外（visible-near infrared, VNIR；380~1300 nm）、短波红外（shortwave infrared, SWIR；1300~2500 nm）以及热红外（thermal infrared, TIR；6000~15000 nm）波段形成互补。然而，受限于近地与遥感高光谱传感仪器的技术瓶颈，中红外波段在矿产勘探与采矿领域的应用长期未得到充分开发。
随着便携式傅里叶变换红外（portable Fourier transform infrared, pFTIR）光谱仪、新近研发的HyLogger4™（Corescan Pty Ltd.）等商用化高光谱手持岩芯传感仪器的问世，这一长期未被充分探索的波段的反射光谱，现已可为矿产资源行业所获取。
目前已有多种方法可基于岩芯或野外样品采集的高光谱反射光谱反演矿物组成，例如将实测反射光谱与光谱参考库（如https://mineralspectrallibraries.csiro.au/）进行比对的全自动/半自动光谱解混算法，以及针对特定矿物类别的脚本处理方法与高斯去卷积法。
本数据集收录的中红外反射光谱，旨在加深学界对造岩矿物与找矿指示矿物的中红外光谱特征的认知，这将为开发、验证基于中红外波段反演相对矿物丰度、矿物组成、结晶度、含水量与晶粒尺寸等参数的方法提供支撑。本次展示的中红外反射光谱，均配套有针对不同地质环境采集的各类样品所测得的定量与半定量X射线衍射（X-ray diffractometry, XRD）分析结果。

搜集汇总

背景与挑战

背景概述

MIR spectral library是一个由澳大利亚联邦科学与工业研究组织于2021年发布的数据集，包含中红外波长范围（2500至6000纳米）的岩石和土壤反射光谱，用于识别矿物特征。该数据集支持矿物勘探和采矿应用，提供光谱数据及相关X射线衍射测量，旨在促进矿物丰度、成分等推断方法的开发。