Evaluation of the effective bulk composition (EBC) during growth of garnet

Evaluation of the effective bulk composition (EBC) during growth of garnet
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石榴石生长过程中有效整体成分(EBC)的评估

DOI:
10.1016/j.chemgeo.2018.05.019
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发表时间:
2018
期刊:
影响因子:
3.9
通讯作者:
Wolfe, Oliver M.
Wolfe, Oliver M.
中科院分区:
地球科学2区
文献类型:
--
作者:
Spear, Frank S.;Wolfe, Oliver M.

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对佛蒙特州中部的8个石榴石样品计算了石榴石初始生长的有效体积成分(EBC),该石榴石只有在石榴石-In平衡反应大大超出后才成核。所发展的方法假定石榴石的组成由假定成核条件下的最大驱动力(吉布斯自由能的最大变化)决定。用等值线相交的方法求出等值线交点符合成核P-T条件的EBC,所有样品(4个不含绿帘石和4个含绿帘石)的EBC所含的MnO和FeO(或FeO/MgO)均低于整个岩块的组成。在所有不含绿帘石的样品和四个含绿帘石的样品中,EBC中的CaO含量都低于全岩整体成分。EBC组分与全岩组分的差异是由反应物溶解动力学的迟缓引起的,而不是营养物质向石榴石的扩散输送造成的。
The effective bulk composition (EBC) for the initial growth of garnet that has nucleated only after considerable overstepping of the equilibrium garnet-in reaction has been calculated for eight samples from central Vermont. The method developed assumes that the composition of garnet is determined by the maximum driving force (maximum change in Gibbs free energy) at the assumed conditions of nucleation. The method of intersecting isopleths is used to find the EBC where the isopleth intersection matches the P–T conditions of nucleation.The calculated EBC for all samples (four epidote-free and four epidote-bearing) contains less MnO and FeO (or lower FeO/MgO) than the whole rock bulk composition. The CaO content of the EBC is lower than the whole rock bulk composition in all epidote-free samples and in two of the four epidote-bearing samples. It is proposed that the differences between the EBC and whole rock bulk composition are caused by the sluggish kinetics of dissolution of reactants rather than diffusive transport of nutrients to the garnet.
DOI: 10.1016/j.chemgeo.2017.06.038
发表时间: 2017-09
期刊: Chemical Geology
影响因子: 3.9
作者:
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发表时间: 2011-11-01
影响因子: 3.5
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影响因子: 2.6
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