A simple and robust method for calculating temperatures of granitoid magmas

doi:10.1007/s00710-021-00769-5

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	A simple and robust method for calculating temperatures of granitoid magmas
	Duan, Meng 2,3; Niu, Yaoling 1,3,4; Sun, Pu 2,3; Chen, Shuo 2,3; Kong, Juanjuan 2; Li, Jiyong 2; Zhang, Yu 3; Hu, Yan 2; Shao, Fengli 2
刊名	MINERALOGY AND PETROLOGY
	2021-11-22
页码	11
关键词	Zircon saturation thermometry Magma temperature Granitoid magmatism SiO2 approximation for magma temperature
ISSN号	0930-0708
DOI	10.1007/s00710-021-00769-5
通讯作者	Duan, Meng(meng.duan@qdio.ac.cn) ; Niu, Yaoling(yaoling.niu@durham.ac.uk)
英文摘要	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.
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
语种	英语
出版者	SPRINGER WIEN
WOS记录号	WOS:000721475900001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/177242]
专题	海洋研究所_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.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, 7 Nanhai Rd, Qingdao 266071, Shandong, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, 1 Wenhai Rd, Qingdao 266061, Shandong, Peoples R China 4.China Univ Geosci, Sch Earth Sci & Resources, 29 Xueyuan Rd, Beijing 100083, Peoples R China
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.