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Melt Pockets in Garnet Megacrysts from Cenozoic Alkali Basalts of the Shavaryn Tsaram Vicinity, Mongolia
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2021-06-25 , DOI: 10.1111/1755-6724.14768 Anna ASEEVA 1, 2 , Oleg AVCHENKO 1 , Alexander KARABTSOV 1 , Alexander CHASHCHIN 1 , Sergey VYSOTSKIY 1 , Victoria YAKOVENKO 1 , Natalia ZARUBINA 1 , Natalia KHARITONOVA 1, 3
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2021-06-25 , DOI: 10.1111/1755-6724.14768 Anna ASEEVA 1, 2 , Oleg AVCHENKO 1 , Alexander KARABTSOV 1 , Alexander CHASHCHIN 1 , Sergey VYSOTSKIY 1 , Victoria YAKOVENKO 1 , Natalia ZARUBINA 1 , Natalia KHARITONOVA 1, 3
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Garnet megacryst with a multiphase inclusion from intraplate alkali basalts of the Shavaryn Tsaram (Tariat, Mongolia) was the object of the study. This unusual aggregate consists of porous glass, Ti-rich biotite, orthopyroxene, spinel, clinopyroxene, olivine, and ilmenite. WinTWQ 2.32 thermodynamic simulation of this system revealed a few intervals of equilibrium. Pressure and temperature adjustment reflected in the paragenetic minerals of the melt pocket. The capture of already crystallised garnet megacryst was at P = 0.8–1 GPa and T = 1120–1160°C. Mineral crystallisation inside the melt pocket, accompanied by external inputs, occurred at P = 0.75–0.95 GPa; T = 790–1120°C. Symplectite assemblage formed in the garnet megacryst due to decomposition at (P = 0.55–0.7 GPa; T = 850–930°C). The study of the oxygen isotope content in primary garnet and biotite of the melt pocket showed that the δ18OVSMOW values are the same and correspond to that of typical mantle xenoliths. However, the chemical and microcomponent composition of the melt pocket minerals reveals a material that differs from basalts and peridotites. Thus, it has been revealed that the multiphase inclusion in the garnet megacryst formed not only on account of the garnet's substance, but also due to the entrapped material of the Earth's interior.
中文翻译：
蒙古Shavaryn Tsaram 附近新生代碱性玄武岩石榴石巨晶中的熔体袋
来自Shavaryn Tsaram（Tariat，蒙古）的板内碱性玄武岩中含有多相包裹体的石榴石巨晶是研究的对象。这种不寻常的骨料由多孔玻璃、富钛黑云母、斜方辉石、尖晶石、单斜辉石、橄榄石和钛铁矿组成。该系统的 WinTWQ 2.32 热力学模拟揭示了几个平衡区间。压力和温度的调节反映在熔袋的共生矿物上。在P = 0.8–1 GPa 和T = 1120–1160°C 时捕获已经结晶的石榴石巨晶。在P = 0.75-0.95 GPa时，熔袋内的矿物结晶伴随着外部输入发生；吨= 790–1120°C。由于在 ( P = 0.55–0.7 GPa; T = 850–930°C) 下分解，在石榴石巨晶中形成了合辉石组合。对原生石榴石和熔体黑云母中氧同位素含量的研究表明，δ 18 O VS M OW值相同，与典型的地幔包体相当。然而，熔袋矿物的化学和微组分组成揭示了一种不同于玄武岩和橄榄岩的材料。因此，已揭示石榴石巨晶中的多相包裹体不仅是由于石榴石的物质，而且是由于地球内部的截留物质。
更新日期：2021-06-25
中文翻译：
蒙古Shavaryn Tsaram 附近新生代碱性玄武岩石榴石巨晶中的熔体袋
来自Shavaryn Tsaram（Tariat，蒙古）的板内碱性玄武岩中含有多相包裹体的石榴石巨晶是研究的对象。这种不寻常的骨料由多孔玻璃、富钛黑云母、斜方辉石、尖晶石、单斜辉石、橄榄石和钛铁矿组成。该系统的 WinTWQ 2.32 热力学模拟揭示了几个平衡区间。压力和温度的调节反映在熔袋的共生矿物上。在P = 0.8–1 GPa 和T = 1120–1160°C 时捕获已经结晶的石榴石巨晶。在P = 0.75-0.95 GPa时，熔袋内的矿物结晶伴随着外部输入发生；吨= 790–1120°C。由于在 ( P = 0.55–0.7 GPa; T = 850–930°C) 下分解，在石榴石巨晶中形成了合辉石组合。对原生石榴石和熔体黑云母中氧同位素含量的研究表明，δ 18 O VS M OW值相同，与典型的地幔包体相当。然而，熔袋矿物的化学和微组分组成揭示了一种不同于玄武岩和橄榄岩的材料。因此，已揭示石榴石巨晶中的多相包裹体不仅是由于石榴石的物质，而且是由于地球内部的截留物质。
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