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Trace element partitioning between amphibole and hydrous silicate glasses at 0.6-2.6 GPa
Bo Zhang;  Xianxu Hu;  Peng Li;  Qizhe Tang;  Wenge Zhou
2019
Source PublicationActa Geochimica
Volume38Issue:3Pages:414-429
Abstract

Partitioning behavior between amphibole and silicate glass of thirty-three minor and trace elements (Sc, Ti, V, Cr, Co, Rb, Sr, P, Y, Zr, Nb, Cs, Ba, K, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, Pb, Th, and U) have been determined experimentally. Products of crystallization of hydrous basalt melts from 0.6 GPa/860 °C up to 2.6 GPa/970 °C were obtained in a multi-anvil apparatus. Major and trace element compositions of amphibole and glass were determined with a combination of electron microprobe and laser ablation inductively coupled plasma mass spectrometry. The main mineral phase is calcic amphibole, and the coexisting glass compositions are tonalite, granodiorite, and granite. The compatibility of rare earth elements increase at 915 °C and then decrease at 970 °C, but the compatibility of most of these elements shows a continued, significant increase with increasing pressure. For high-field strength elements, large ion lithophile elements, actinide compatibility decrease with increasing temperature or pressure, but transition metals show a continued increase in compatibility within the temperature–pressure conditions. From mathematical and graphical fitting, we determined best-fit values for the ideal ionic radius (r0, 1.01–1.04 Å), the strain-free partition coefficient (D0, 1.18–1.58), and apparent Young’s modulus (E, 142–370 GPa) for the M4 site in amphibole according to the lattice strain model. The DM40D0M4 for rare earth elements rises at 915 °C and then drops at 970 °C at 0.6 GPa. However, the DM40D0M4 values are positively proportional to the pressure for rare earth elements in the amphibole-glass pairs at 0.6–2.6 GPa and 970 °C. Furthermore, the derived best-fit values for rM40r0M4 and EM4EM4 are almost constant and trend to increase with rising temperature and pressure, respectively. The partition coefficient is distinctly different for different melt compositions. The rare earth elements become more enriched in amphibole if the quenched glass is granodiorite or granite compared to the tonalitic glasses.

KeywordAmphibole Silicate Glass Trace Elements Partition Coefficients Lattice Strain Model
Indexed ByEI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10355
Collection地球内部物质高温高压实验室
Affiliation1.Key Laboratory for High Temperature and High Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.Guizhou University of Finance and Economics, Guiyang 550025, China
Recommended Citation
GB/T 7714
Bo Zhang;Xianxu Hu;Peng Li;Qizhe Tang;Wenge Zhou. Trace element partitioning between amphibole and hydrous silicate glasses at 0.6-2.6 GPa[J]. Acta Geochimica,2019,38(3):414-429.
APA Bo Zhang;Xianxu Hu;Peng Li;Qizhe Tang;Wenge Zhou.(2019).Trace element partitioning between amphibole and hydrous silicate glasses at 0.6-2.6 GPa.Acta Geochimica,38(3),414-429.
MLA Bo Zhang;Xianxu Hu;Peng Li;Qizhe Tang;Wenge Zhou."Trace element partitioning between amphibole and hydrous silicate glasses at 0.6-2.6 GPa".Acta Geochimica 38.3(2019):414-429.
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