Supplementary materials for thesis "Provenance studies of British prehistoric greenstone implements using non-destructive analytical methods" - part 1

Geochemical data obtained using field-portable non-destructive X-ray fluorescence instrumentation (PXRF), supported by magnetic susceptibility (MS) measurements, is able to narrow the provenance of IPC Group I prehistoric greenstone axes to two locations in West Cornwall: St Ives and Mullion Island. It also supports the provenance of IPC Group III axes to a greenstone quarry near Perranuthnoe, Cornwall and supports the Cornish origin of seven Irish gabbroic and doleritic axes. Provenancing methodology involved the examination of 149 axe and 73 greenstone thin sections, followed by comparison of 272 axe and over 100 exposure geochemical and magnetic analyses using Simple Component Analysis (SCA), element discrimination diagrams, Discriminant Analysis (DA) and comparative statistics (MANOVA, West). Accuracy, precision and detection limits of the PXRF are determined using international reference samples, greenstone samples and greenstone axes. PXRF instrumentation is generally linearly calibrated with zero offset, and with a compensatable bias for K, Ca, Ti, Mn, Fe, Rb, Sr, Y, Zr, Nb, Ba, Ce and Pb. Precision in measuring greenstone rock composition is 5.3% relative standard deviation of the mean based on two PXRF measurements and from elements with concentrations tentimes the PXRF detection limit (generally less than 900ppm. for major elements and less than 30ppm for trace elements). Empirical studies using newly manufactured greenstone axes show that no adjustments to PXRF measurements are required when measuring polished curved axe surfaces, and that Ti, Y, Zr and Nb PXRF measurements made on weathered surfaces are statistically indistinguishable from those measured on fresh, flat surfaces of the same composition. KT5 magnetic susceptibility meter precision is 1.5% relative when measuring typical greenstone rock with MS of 0.6 x 10^-3 SI. A robust correction procedure based on estimates of axe curvature, surface relief and dimensions is shown to correct the measured MS to that of the true rock value.This is number 1 of 5 parts. The PCD images have been converted to JPG to enable accessibility. For details of how to open the original PCD files please refer to the README file. For more information, please refer to the thesis.

本数据集采用便携式现场无损X射线荧光光谱仪（PXRF）获取地球化学数据，并辅以磁化率（MS）测量，可将IPC第一组史前绿石斧的物源范围限定在西康沃尔的两处地点：圣艾夫斯与马利恩岛。该研究同时证实，IPC第三组斧的物源来自康沃尔佩拉努特诺附近的绿石采石场，并支持7件爱尔兰辉长岩质与粒玄岩质斧具的康沃尔起源。
物源分析流程包括对149件斧样品与73件绿石薄片的镜下鉴定，随后通过简单成分分析（SCA）、元素判别图、判别分析（DA）及比较统计分析（MANOVA，West），对272件斧样品及100余处露头的地球化学与磁学分析数据开展对比。
研究通过国际标准样品、绿石样品及绿石斧样品测定了PXRF的准确度、精密度与检出限。PXRF仪器通常采用零偏移线性校准，且对钾（K）、钙（Ca）、钛（Ti）、锰（Mn）、铁（Fe）、铷（Rb）、锶（Sr）、钇（Y）、锆（Zr）、铌（Nb）、钡（Ba）、铈（Ce）及铅（Pb）具有可补偿的系统偏差。基于两次PXRF测试且浓度为PXRF检出限十倍的元素（常量元素通常低于900ppm，微量元素通常低于30ppm），绿石岩石成分测量的精密度为平均值的5.3%相对标准偏差。
采用新制作的绿石斧开展的实证研究表明：测试抛光弯曲斧面时，无需对PXRF测试结果进行校正；且在风化表面测得的钛、钇、锆、铌的PXRF测试结果，与相同成分的新鲜平整表面的测试结果在统计学上无显著差异。当测试磁化率为0.6×10⁻³ SI的典型绿石岩石时，KT5磁化率仪的相对测量精密度为1.5%。本研究提出了基于斧体曲率、表面起伏及尺寸估算的稳健校正流程，可将实测磁化率校正为真实岩石的磁化率数值。
本内容为5个分册中的第1部分。为提升可访问性，所有PCD图像已转换为JPG格式。如需了解原始PCD文件的打开方法，请参阅README文件。如需获取更多相关信息，请参阅相关学位论文。