基于机器学习的锆石成因分类研究

doi:10.13745/j.esf.sf.2022.2.75

地学前缘 ›› 2022, Vol. 29 ›› Issue (5): 464-475.DOI: 10.13745/j.esf.sf.2022.2.75

基于机器学习的锆石成因分类研究

朱紫怡¹(), 周飞¹, 王瑀¹, 周统¹, 侯照亮², 邱昆峰¹^,³^,^*()

1.中国地质大学(北京) 地球科学与资源学院, 北京 100083
2.奥地利维也纳大学地质系, 维也纳 1090
3.中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083

收稿日期:2021-12-16 修回日期:2022-03-18 出版日期:2022-09-25 发布日期:2022-08-24
通讯作者: 邱昆峰
作者简介:朱紫怡(2000—),女,本科生,地质学专业。E-mail: ziyizhuuu@qq.com
基金资助:
国家自然科学基金项目(91962106);国家自然科学基金项目(42111530124);国家自然科学基金项目(42072087);国家重点研发计划项目(2019YFA0708603);中国高校产学研创新基金资助课题(2021ALA01006);111计划2.0(BP0719021);中国地质大学(北京)创新创业训练计划项目(S202111415004)

Machine learning-based approach for zircon classification and genesis determination

ZHU Ziyi¹(), ZHOU Fei¹, WANG Yu¹, ZHOU Tong¹, HOU Zhaoliang², QIU Kunfeng¹^,³^,^*()

1. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
2. Department of Geology, University of Vienna, Vienna 1090, Austria
3. State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences (Beijing), Beijing 100083, China

Received:2021-12-16 Revised:2022-03-18 Online:2022-09-25 Published:2022-08-24
Contact: QIU Kunfeng

摘要/Abstract

摘要：

锆石是在自然界中多种温压条件下能够稳定保存,并记录原岩年龄信息的副矿物。锆石微量元素能完整记录地质演化过程信息。通过微量元素分析锆石成因的研究已久,通常利用Th-U图解和La_N-(Sm/La)_N图解等二元图解对锆石进行分类研究。然而,随着锆石研究的深入,以及二元图解无法呈现数据高维度信息的局限性,传统图解已经不能满足对锆石类型进行准确判别,且对已知类型的锆石出现判定偏差。因此,本文将地质大数据与机器学习相结合,训练出高维度锆石成因分类器。文中收集了3 498条不同成因类型的锆石微量元素数据,并通过测试和运用随机森林、支持向量机、人工神经网络和k近邻等4种机器学习算法,最终得出准确率为86.8%的线性支持向量机锆石成因分类器,用于锆石类型的判定与预测。这项工作为锆石分类研究提供了更高维度的判别手段,极大提高了微量元素分析成因结果的精度。将锆石微量元素数据与机器学习方法相结合,是大数据分析与机器学习技术在地球化学研究中的积极探索。

关键词: 锆石, 微量元素, 成因, 大数据分析, 机器学习

Abstract:

Zircon, a stable paragenetic mineral in various geological environments, has been recognized as a great tool in the chronological study of primary rocks. Trace elements in zircons may reveal geological evolutionary processes, and have long been used in zircon classification and zircon formation studies by binary diagram method, such as Th-U and La_N-(Sm/La)_N diagrams. However, with the massive increase of zircon research, the traditional binary diagrams are no longer adequate for a precise determination of zircon types because binary plots cannot display higher dimensional information and therefore can lead to erroneous interpretation of zircon data. To address this issue, we take a machine learning approach to analyzing 3 498 zircon trace element data for different zircon genetic types to obtain high-dimensional zircon classification diagrams. We tested four machine learning algorithms (random forest, support vector machine, artificial neural network, and k-nearest neighbor) and consider support vector machine, with an 86.8% accuracy in predicting zircon type and origin, can best contribute to zircon classification. In addition to the development of a high-dimensional zircon classification diagram, this work also greatly improves the accuracy of zircon genesis determination using trace elements, and demonstrates the applicability of modern data science technique in geochemical research.

Key words: zircon, trace elements, formation, big data analysis, machine learning

中图分类号:

P581

朱紫怡, 周飞, 王瑀, 周统, 侯照亮, 邱昆峰. 基于机器学习的锆石成因分类研究[J]. 地学前缘, 2022, 29(5): 464-475.

ZHU Ziyi, ZHOU Fei, WANG Yu, ZHOU Tong, HOU Zhaoliang, QIU Kunfeng. Machine learning-based approach for zircon classification and genesis determination[J]. Earth Science Frontiers, 2022, 29(5): 464-475.

图/表 12

图1 不同类型的锆石微量元素散点图(底图区域据文献[9])

Fig.1 Scatter plot of the published zircon-associated trace elements from various rock types. Background region based on [9].

表1 已发表的锆石成因类型判别图解准确率

Table 1 The accuracy of the published diagram to classify different zircon provenance

判别图解	准确率/%
判别图解	岩浆锆石	热液锆石	变质锆石	平均
Th/U	81.65	-	23.5	73.1
La_N-(Sm/La)_N	42.4	20.9	-	38.5

表2 不同母岩类型锆石微量元素数据量

Table 2 Published data of zircon trace elements from different provenance

序号	母岩类型	数据量	参考文献
1	岩浆锆石	2466	[9,25⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓-46]
2	热液锆石	508	[9,30,35,37-38,41-42,47⇓⇓⇓⇓⇓⇓⇓-55]
3	变质锆石	524	[33-34,49,56⇓⇓⇓⇓⇓-62]

图2 本文所收集数据在全球分布情况

Fig.2 Global distribution of the collected zircon data

图3 锆石微量元素数据含量箱形图

Fig.3 Trace element concentrations of the various zircons

表3 不同母岩类型锆石微量元素数据量缺失情况

Table 3 Missing data of zircon trace elements from different provenance

元素	元素数据缺失率			元素	元素数据缺失率
元素	热液锆石	岩浆锆石	变质锆石	元素	热液锆石	岩浆锆石	变质锆石
La	0%	7%	23%	Tm	4%	1%	17%
Ce	0%	0%	0%	Yb	0%	0%	0%
Pr	0%	1%	4%	Lu	0%	0%	12%
Nd	0%	0%	2%	Y	20%	7%	38%
Sm	0%	0%	1%	Hf	27%	8%	41%
Eu	1%	0%	1%	Nb	38%	23%	58%
Gd	0%	0%	0%	Ta	36%	67%	65%
Tb	5%	1%	20%	Ti	40%	23%	47%
Dy	0%	0%	0%	Pb	42%	79%	78%
Ho	5%	0%	14%	Th	13%	2%	15%
Er	0%	0%	2%	U	13%	2%	15%

图4 该数据集中锆石穷举投图排名前9的二维图解

Fig.4 Top 9 biplots from the dataset of zircon by using exhaustive method

表4 4种模型的最优超参数和在测试集的准确率

Table 4 Hyper-parameters of the 4 models and the accuracy on the test set

模型	准确率	最优超参数
SVM(linear)	0.868	C = 16
SVM(RBF)	0.802	C=16,gamma = 0.5
KNN	0.860	weights = distance, n neighbors = 1
ANN	0.899	alpha = 0.001, activation = tanh, hidden layer sizes = (20,1)
Random Forest	0.878	n estimators = 100, max depth = 30, max features = 16

图5 混淆矩阵基于线性内核支持向量机的分类器的验证结果

Fig.5 Confusion matrix showing results of linear SVM classifier

表5 测试集在支持向量机模型中的精确率、召回率、F1分数

Table 5 Accuracy, recall, and F1 score of the test set in the SVM

锆石类型	精确率	召回率	F1分数	数量
热液锆石	0.855	0.855	0.855	76
岩浆锆石	0.857	0.868	0.863	76
变质锆石	0.893	0.882	0.887	76
宏平均(macro)			0.868	228

图6 不同算法对于特征构建和过采样的反应

Fig.6 Responses of different algorithms to feature construction and oversampling

图7 混淆矩阵基于4种分类器的验证结果

Fig.7 Confusion matrix showing results of the four classifiers

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基于机器学习的锆石成因分类研究

Machine learning-based approach for zircon classification and genesis determination

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