| A simple and robust method for calculating temperatures of granitoid magmas | |
Duan, Meng1,2; Niu, Yaoling2,3,4; Sun, Pu1,2 ; Chen, Shuo1,2; Kong, Juanjuan1; Li, Jiyong1; Zhang, Yu2; Hu, Yan1; Shao, Fengli1
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| 2021-11-22 | |
| 发表期刊 | MINERALOGY AND PETROLOGY
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| ISSN | 0930-0708 |
| 页码 | 11 |
| 通讯作者 | Duan, Meng([email protected]) ; Niu, Yaoling([email protected]) |
| 摘要 | Calculating the temperatures of magmas from which granitoid rocks solidify is a key task of studying their petrogenesis, but few geothermometers are satisfactory. Zircon saturation thermometry has been the most widely used because it is conceptually simple and practically convenient, and because it is based on experimental calibrations with significant correlation of the calculated zircon saturation temperature (T-Zr) with zirconium (Zr) content in the granitic melt (i.e., T-Zr proportional to Zr-MELT). However, application of this thermometry to natural rocks can be misleading, resulting in the calculated T-Zr having no geological significance. This thermometry requires Zr content and a compound bulk compositional parameter M of the melt as input variables. As the Zr and M information of the melt is not available, petrologists simply use bulk-rock Zr content (ZrBULK-ROCK) and M to calculate T-Zr. In the experimental calibration, T-Zr shows no correlation with M, thus the calculated T-Zr is only a function of Zr-MELT. Because granitoid rocks represent cumulates or mixtures of melt with crystals before magma solidification and because significant amount Zr in the bulk-rock sample reside in zircon crystals of varying origin (liquidus, captured or inherited crystals) with unknown modal abundance, ZrBULK-ROCK cannot be equated with Zr-MELT that is unknown. Hence, the calculated magma temperatures T-Zr using ZrBULK-ROCK have no significance in both theory and practice. As an alternative, we propose to use the empirical equation T-SiO2 (degrees C)= -14.16 x SiO2 + 1723 for granitoid studies, not to rely on exact values for individual samples but focus on the similarities and differences between samples and sample suites for comparison. This simple and robust thermometry is based on experimentally determined phase equilibria with T proportional to 1/SiO2. |
| 关键词 | Zircon saturation thermometry Magma temperature Granitoid magmatism SiO2 approximation for magma temperature |
| DOI | 10.1007/s00710-021-00769-5 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Natural Science Foundation of China (NSFC)[41130314]; National Natural Science Foundation of China (NSFC)[91014003]; Chinese Academy of Sciences[Y422171011L]; 111 Project[B18048] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| WOS类目 | Geochemistry & Geophysics ; Mineralogy |
| WOS记录号 | WOS:000721475900001 |
| 出版者 | SPRINGER WIEN |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/177243 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Duan, Meng; Niu, Yaoling |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, 7 Nanhai Rd, Qingdao 266071, Shandong, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, 1 Wenhai Rd, Qingdao 266061, Shandong, Peoples R China 3.China Univ Geosci, Sch Earth Sci & Resources, 29 Xueyuan Rd, Beijing 100083, Peoples R China 4.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England |
| 第一作者单位 | 中国科学院海洋研究所 |
| 通讯作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Duan, Meng,Niu, Yaoling,Sun, Pu,et al. A simple and robust method for calculating temperatures of granitoid magmas[J]. MINERALOGY AND PETROLOGY,2021:11. |
| APA | Duan, Meng.,Niu, Yaoling.,Sun, Pu.,Chen, Shuo.,Kong, Juanjuan.,...&Shao, Fengli.(2021).A simple and robust method for calculating temperatures of granitoid magmas.MINERALOGY AND PETROLOGY,11. |
| MLA | Duan, Meng,et al."A simple and robust method for calculating temperatures of granitoid magmas".MINERALOGY AND PETROLOGY (2021):11. |
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