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表 1 温度估算结果表(温度由Al、Cr、Ca-橄榄石温度计估算)Table 1. Results of the temperature estimates (temperature is estimated by Al, Cr, Ca in olivine thermometer)
Thermometer Type Average Temperature /℃ TAl in ol 926 TCr in ol 946 TCa in ol 995 表 2 基于橄榄石化学成分，使用线性判别及机器学习模型对橄榄石产地判别的准确率统计Table 2. Accuracy statistics of identification of olivine origin using linear discrimination and machine learning model based on olive petrochemical compositionsModel Accuracy/% Sample quantity：296 Sample quantity：313 B-LDA 83.4 84.3 Extra tree 93.3 93.6 Random Forest 86.5 88.3 Xgboost 92.1 88.3 Logistic Regression 79.8 85.0 lightgbm 95.5 83.0 catboost 89.9 92.6 Naive Bayes 80.9 80.9 注：产地判别选取Mn，Zn，Na，Al，Sc，V，Cr，P，Ti及REE十种元素，不同模型的准确率基本都高于80%;第一次使用296颗宝石级橄榄石样品进行判别，第二次加入17颗非宝石级橄榄石进行判别，两次判别不同模型的准确率均有所变化，表明样品数量和橄榄石品质对模型准确率有不同程度的影响 ![]()
图 1 橄榄玄武岩样品照片及试验结果：(a)橄榄石晶体及其玄武岩围岩；(b)橄榄玄武岩的BSE图像中可见橄榄石、辉石、赤铁矿-钛铁矿、角闪石、磷灰石等矿物。橄榄石和辉石呈自形-半自形，赤铁矿-钛铁矿常呈规则的六边形，角闪石大多为短柱状，平行或近垂直排列，磷灰石成近六边形穿排列在橄榄石和辉石附近；(c)橄榄玄武岩中主要矿物的拉曼光谱；(d)玄武岩微量元素(原始地幔标准化)配分模式蛛网，玄武岩中稀土元素呈右倾形分布，轻重稀土分异明显Figure 1. Photographs of the olivine basalt samples and test results: (a) peridot crystals and basalt samples; (b) BSE images of olivine basalt showing the presence of olivine, diopside, enstatite, hematite-ilmenite, hornblende, apatite, etc. Olivine and diopside exhibit idiomorphic to hypautomorphic. Hematite-ilmenite typically forms regular hexagons. Hornblende is predominantly observed as short columnar shapes, arranged parallel or nearly perpendicular. Apatite forms near-hexagonal prisms arranged in clusters adjacent to olivine and pyroxene; (c) Raman spectra of the main minerals in the olive basalts; (d) spider diagrams of trace elements (normalized by primitive mantle) in basaltic matrix. The trace elements show a right-dipping distribution, with obvious differences between light and heavy rare earths.Di: Diopside; En: Enstatite; Hem-Ilm: Hematite-Ilmenite; Pl: Plagioclase; Ol: Olivine; Ap: Apatite; Hb: Hornblende
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