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首页> 外文期刊>Contributions to Mineralogy and Petrology >The last lavas erupted during the main phase of the Siberian flood volcanic province: results from experimental petrology
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The last lavas erupted during the main phase of the Siberian flood volcanic province: results from experimental petrology

机译：西伯利亚洪水火山省主要阶段爆发的最后熔岩：实验岩石学的结果

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The final lavas of the Siberian flood basalts are a ～1,000 m thick section of meimechites, high-alkali, high-titanium, hydrous lavas that contrast sharply with the tholeiites that precede them. This paper presents a phase equilibrium study indicating that a candidate primary meimechite magma with 1 wt% water originated at ～5.5 GPa and 1,700°C, both hotter and shallower than other estimates for melting beneath continental lithosphere. The experiments also suggest that a higher volatile content was involved in meimechite source genesis. Both the absence of orthopyroxene in any experiment and the close field association with carbonatites suggest that the meimechite source region may have been metasomatized with a CO2-rich fluid. A small additional quantity of CO2 and water would move magma origination to ～1,550–1,600°C.
机译：西伯利亚洪水玄武岩的最终熔岩是一块约1,000 m厚的meimechite，高碱，高钛，含水熔岩，与之前的tholeiite形成鲜明对比。本文提出了一项相平衡研究，表明含1 wt％水的候选初生白云岩岩浆起源于〜5.5 GPa和1,700°C，比大陆岩石圈下的其他熔融估计更热和更浅。实验还表明，更高的挥发物含量参与了memechite源的发生。无论在任何实验中都没有邻苯二甲醚，而且与碳酸盐岩的近场联系都表明，meimechite的源区可能已被富含CO2 的流体交代。少量的二氧化碳和水将使岩浆起源移至约1,550–1,600°C。

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