Unraveling the link between worldwide adakite-like rocks and porphyry Cu deposits
文献类型：期刊论文
| 作者 | Wu, Chao2,3; Chen, Guoxiong1; Chen, Huayong2,3,4
|
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2025-02-05 |
| 卷号 | 673页码:17 |
| 关键词 | Adakite-like rock Porphyry copper deposit Major and trace elements Mature crust Juvenile crust Machine leaning |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2024.122521 |
| 英文摘要 | Adakite-like rocks, as an important recorder of magmatic evolution in mantle and crust, are closely associated with major porphyry Cu deposits. However, the underlying mechanism connecting these associations remains insufficiently elucidated. This study compiles ca. 7000 whole-rock geochemical data from Phanerozoic adakitelike rock samples and from ore-forming porphyries in porphyry Cu deposits. Machine learning investigations are performed to characterize the geochemical variations of adakite-like rocks from various orogenic or cratonic systems and investigate any geochemical similarities with rocks associated with porphyry ore systems. Principal component analysis (PCA), along with t-distributed Stochastic Neighbor Embedding (t-SNE), highlights elemental distinctions between adakite-like rocks formed in mature and juvenile crust and the similarities of rocks from porphyry Cu-Mo deposits with the former and rocks from porphyry Cu-Au deposits with the latter. Extreme Gradient Boosting (XGBoost) and Support Vector Machine (SVM) analyses are applied to the original dataset and the PCA data derived from the dataset to discriminate adakite-like rocks from various geodynamic settings from each other and from rocks associated with porphyry ore deposits. Our models show that XGBoost and SVM can identify the tectonic regions of adakite-like rocks and rocks from porphyry copper systems with high efficiency and confidence e.g., accuracy = 0.88-0.94 and area under curve (AUC) = 0.69-0.86. The application of SHapley Additive exPlanations (SHAP) values is employed to elucidate the parameters that discriminate the different environments, providing insight into the underlying petrogenetic processes, including diverse levels of formation depth and extent of mantle interaction. Additionally, when examining ore-forming porphyries and adakite-like rocks, the incorporation of heatmaps into taxonomic classification (HTC) provides significant distinguishing factors with substantial geological implications. These findings suggest potential geological processes (e.g., remelting of Cu-sulfide-bearing cumulates or flotation of Cu-sulfide phases attached to vapor bubbles) that may enrich the source magma of ore-forming porphyries beyond the conventional geological processes responsible for adakite-like rock formation, which could serve as an exploration indicator. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001377361800001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/81908]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Chen, Huayong |
| 作者单位 | 1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 2.Chinese Acad Sci, Key Lab Mineral & Metallogeny, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 3.Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, Chao,Chen, Guoxiong,Chen, Huayong. Unraveling the link between worldwide adakite-like rocks and porphyry Cu deposits[J]. CHEMICAL GEOLOGY,2025,673:17. |
| APA | Wu, Chao,Chen, Guoxiong,&Chen, Huayong.(2025).Unraveling the link between worldwide adakite-like rocks and porphyry Cu deposits.CHEMICAL GEOLOGY,673,17. |
| MLA | Wu, Chao,et al."Unraveling the link between worldwide adakite-like rocks and porphyry Cu deposits".CHEMICAL GEOLOGY 673(2025):17. |
入库方式： OAI收割
来源：广州地球化学研究所
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