使用机器学习约束重新考察太古宙地面地壳的成分演化

IF 3.6 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Junteng Lyu, Ziyi Guo, Ming Tang
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引用次数: 0

摘要

太古宙陆地地壳的组成,无论是基性的还是长质的,由于构造的不确定性和代理的限制,仍然存在争议。本文采用基于随机森林回归算法的机器学习模型,对陆源细粒沉积岩的多元素地球化学数据进行分析,重建陆源地壳中MgO含量。利用太古宙克拉通火成岩和后太古宙火成岩模拟混合样品的主要氧化物(TiO2和Al2O3)和微量元素(Sc、Cr、Co、Ni、Cu、Zn、Y、Zr、Nb和ree)对模型进行训练。利用各种现代样品预测现代陆地地壳中MgO含量,证明了该模型的有效性,其中MgO含量已得到很好的约束。我们还证明了预测的准确性对构造背景不敏感。然后,我们使用该模型重建了地球历史上陆地地壳的化学演化,并比较了我们的模型与反映陆地地壳组成的其他代理之间的差异。我们的模型结果表明,在新太古代时期,陆上地壳的MgO含量系统下降(7-10 wt%至3-4 wt%),并从基性(70 - 100%科马铁矿-玄武岩)向长英质(70 - 90% TTG)转变,之后的陆上地壳达到了与现代陆上地壳相似的成分。我们的方法的结果与Ni/Co和Cr/Zn代理的结果相似,但与Zr/TiO2和Al2O3/TiO2代理的结果不同。我们认为,许多以前使用的成分指标对构造环境敏感,将这些指标应用于陆源沉积物可能导致对太古宙陆地地壳成分的错误结果。此外,我们警告不要使用与MgO或SiO2含量相关性高度非线性的代理,这可能导致预测的烃源岩MgO或SiO2含量有很大的不确定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Compositional evolution of the Archean subaerial crust revisited using machine learning constraints
The composition of the Archean subaerial crust, whether mafic or felsic, remains debated due to tectonic uncertainties and proxy limitations. Here, we employ Random Forest Regression algorithm-based machine learning model to analyze multi-element geochemical data from terrigenous fine-grained sedimentary rocks to reconstruct the MgO content in the subaerial crust. The model is trained using major oxides (TiO2 and Al2O3) and trace elements (Sc, Cr, Co, Ni, Cu, Zn, Y, Zr, Nb and REEs) of simulated mixture samples from Archean craton igneous rocks and post-Archean igneous rocks. The validity of this model is demonstrated by using various modern samples to predict MgO content in the modern subaerial crust, whose MgO content has been well constrained. We also demonstrate that the accuracy of the predictions is not sensitive to tectonic settings. We then use this model to reconstruct the chemical evolution of the subaerial crust over Earth's history and compare the differences between our model and other proxies reflecting the composition of the subaerial crust. Our model results suggest that a systematic decline of MgO content in the subaerial crust (7–10 wt% to 3–4 wt%) and a shift from mafic (70–100 % komatiite-basalt) to felsic dominance (∼70–90 % TTG) of the subaerial crust in the Neoarchean period, after which the subaerial crust attained a similar composition to that of the modern subaerial crust. The results from our approach are similar to those from Ni/Co and Cr/Zn proxies, but differ from the results of Zr/TiO2 and Al2O3/TiO2 proxies. We suggest that many previously used composition proxies are sensitive to tectonic settings and applying these proxies to terrigenous sediments can lead to erroneous results on the subaerial crust composition in the Archean. In addition, we caution against the use of proxies whose correlations with MgO or SiO2 content are highly nonlinear, which may result in large uncertainties in the projected MgO or SiO2 content for the source rocks.
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来源期刊
Chemical Geology
Chemical Geology 地学-地球化学与地球物理
CiteScore
7.20
自引率
10.30%
发文量
374
审稿时长
3.6 months
期刊介绍: Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.
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