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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Cation partitioning of garnets from Sittampundi granulite: Their petrogenetic implications
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Cation partitioning of garnets from Sittampundi granulite: Their petrogenetic implications

机译：Sittampundi花岗石石榴石的阳离子分配：其成因意义

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摘要

Garnets from high P-T granulite fields of Sittampundi (South India) were investigated by 57 Fe Mossbauer spectroscopy and electron microprobe analysis. The room-temperature three-band spectra which have been split into two doublets, revealed Fe 2, ions to be exclusively located at the dodecahedral site (isomer shift = 1.303-1.389 mm/s; Tiadrupole splitting (QS) = 3.4233.822 mm/s) and Fe3+ ions at tetrahedral site (isomer shift = 0.006-0.163 nun/s; QS = 0.520-0.663 nun/s). The octahedral site was completely free from both these ions. Fe3+/Sigma Fe varying between 0.073 and 0.150, and the presence of octahedral Si indicate that the studied garnet formation lies in hi, h P-T field. The high values of QS for tetrahedral Fe3+ suggest that the occupied site is regular with little distortion. The fairly broad linewidth, 0.455-0.596 mm/s of Fe3+ doublet may arise from a substitution of some tetrahedral Si by the (OH)(-1) group. The strong partition and ordering of Fe2+ and Fe3+ in dodecahedral and tetrahedral sites, leaving the octahedral site totally free from iron suggest slow cooling and recrystallization of garnet at high temperature.
机译：通过57 Fe Mossbauer光谱和电子微探针分析研究了Sittampundi（印度南部）高P-T花岗岩田中的石榴石。室温三波段光谱已分成两个双峰，表明Fe 2离子仅位于十二面体位点（异构体位移= 1.303-1.389 mm / s;四极分裂（QS）= 3.4233.822 mm / s）和四面体位点的Fe3 +离子（异构体位移= 0.006-0.163 nun / s; QS = 0.520-0.663 nun / s）。八面体位点完全不含这两个离子。 Fe3 + / Sigma Fe在0.073至0.150之间变化，并且八面体Si的存在表明所研究的石榴石形成位于hi，h P-T场中。四面体Fe3 +的QS值较高，表明所占据的位置是规则的，几乎没有变形。 Fe3 +双峰相当宽的线宽0.455-0.596 mm / s可能是由（OH）（-1）基团取代了某些四面体Si所致。 Fe12 +和Fe3 +在十二面体和四面体位点中的强分隔和有序排列，使八面体位点完全不含铁，这表明石榴石在高温下缓慢冷却和重结晶。

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