Experimental constraints on trace element partitioning between coesite and hydrous silicate melt at 5 GPa and 1500-1750℃

IOCAS-IR

	Experimental constraints on trace element partitioning between coesite and hydrous silicate melt at 5 GPa and 1500-1750℃
	Wei YAN ; Xi LIU ; Saijun SUN ; Weidong SUN; Dan WU
发表期刊	Science China(Earth Sciences)
ISSN	1674-7313
	2021-06-17
出版年	2021
卷号	v.64 期号:07 页码:161-173
文献类型	CNKI期刊论文
摘要	Trace element partitioning between coesite and hydrous silicate melt has been investigated at 5 GPa and 1500-1750℃.High-P experiments successfully produced large coesite crystals in equilibrium with large silicate melt pools(plus kyanite and corundum crystals in some cases). Scanning electron microscopy and micro-Raman spectroscopy were employed to characterize the phases and the textures. Wavelength-dispersive electron microprobe analyses were performed to quantify conventional major elements, and laser ablation-inductively coupled plasma-mass spectrometry analyses were successfully conducted to quantify trace elements. Eventually, high-P partition coefficients were obtained for 33 elements. In general coesite is a very pure phase.With a few possible exceptions like Sc, Ti, and V, nearly all other trace elements are incompatible in coesite. Moreover, the partitioning behaviors of nearly all trace elements except some 4+ cations cannot be readily described by the lattice strain model,presumably implying a minor role for the cation size in the trace-element partitioning. Combining our experimental results with the results in the literature, some T and P effects on the element partitioning behavior have been observed: T seemingly has different effects on different trace elements, but P might negatively correlate with the partition coefficients in all cases. Due to its large modal fraction in some subducted materials such as the continental crustal material, coesite might play an important role in the distributions of some trace elements, Ti for example.
关键词	Partition coefficients High-P experiments LA-ICP-MS Coesite Hydrous silicate melt Temperature and pressure dependence
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A011;
CNKI专题名称	地质学;
分类号	P57;P588.3
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	supported by the National Key Research and Development Program of China (Grant No. 2016YFC0600408) ; the Strategic Priority Research Program (B) of Chinese Academy of Sciences (Grant No. XDB42000000) ; the Program of the National Mineral Rock and Fossil Specimens Resource Center from MOST, China
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/187739
专题	中国科学院海洋研究所
作者单位	1.KeyLaboratoryofOrogenicBeltsandCrustalEvolution,MinistryofEducationofChina 2.SchoolofEarthandSpaceSciences,PekingUniversity 3.CenterofDeepSeaResearch,InstituteofOceanography,ChineseAcademyofSciences 4.KeyLaboratoryofMineralogyandMetallogeny,GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences
推荐引用方式 GB/T 7714	Wei YAN,Xi LIU,Saijun SUN,et al. Experimental constraints on trace element partitioning between coesite and hydrous silicate melt at 5 GPa and 1500-1750℃. 2021.