Ti and Cr in High-Pressure Mica: Experimental Study and Application to the Mantle Assemblages

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
A. A. Bendeliani, A. V. Bobrov, L. Bindi, N. N. Eremin
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Abstract

Experiments aimed at the synthesis of Cr- and Ti-bearing phlogopite in the silicate-carbonate systems peridotite—K2CO3 + H2O and basalt—K2CO3 + H2O at 7 GPa and 900–1200°С were carried out. It is shown that the crystallization of titanium-bearing phlogopite requires subducted crustal material at mantle depths. However, the mantle peridotite should predominate over basalt for Ti-phlogopite crystallization; otherwise, dioctahedral mica (aluminoceladonite) with (Mg + Fe)/VIAl > 1 is formed via the scheme 2VIAl = VITi4+ + VI(Mg + Fe). The competitive behavior of Ti and Cr upon incorporation into phlogopite is considered. It is shown that the presence of >1.3 wt % TiO2 introduces a limitation on the high concentrations of Cr2O3 via the scheme VI(Mg2+) + IV(Si4+) = VI(Cr3+) + IV(Al3+). This can explain the compositional patterns of phlogopite from inclusions in natural diamonds, in which the Ti content is much higher than that of Cr. The results obtained support the original idea that the composition of phlogopite may be applied to distinguish the paragenetic associations of diamond.

Abstract Image

高压云母中Ti和Cr的实验研究及其在地幔组合中的应用
在7 GPa、900 ~ 1200°С温度条件下,在硅酸盐-碳酸盐体系中,橄榄岩- k2co3 + H2O和玄武岩- k2co3 + H2O中合成了含Cr和含ti的云母。结果表明,含钛云母的结晶需要地幔深处俯冲的地壳物质。而在钛辉云母结晶过程中,地幔橄榄岩占主导地位,玄武岩占主导地位;反之,二八面体云母(铝钙石)与(Mg + Fe)/VIAl >1由方案2VIAl = VITi4+ + VI(Mg + Fe)组成。考虑了钛和铬掺入银云母后的竞争行为。结果表明,当掺杂>1.3 wt % TiO2时,通过VI(Mg2+) + IV(Si4+) = VI(Cr3+) + IV(Al3+)的方案限制了Cr2O3的高浓度。这可以解释天然金刚石中钛含量远高于铬含量的包裹体中金云母的组成模式。所得结果支持了用金云母的组成来区分金刚石共生组合的最初想法。
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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
期刊介绍: Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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