Staurolite in Metabasites: P–T–X Parameters and the Ratios of Major Components as Criteria of Staurolite Stability

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
E. B. Borisova, Sh. K. Baltybaev, J. A. D. Connolly
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引用次数: 0

Abstract

Fe–Mg staurolite is a typical and widespread mineral of medium-temperature high-alumina metapelites, whereas magnesian staurolite is only relatively rarely found in metamorphosed mafic rocks (metabasites). The most significant factors controlling staurolite stability in metabasites were identified by thermodynamic modeling and analysis of the common features of the mineral-forming processes. In contrast to staurolite in low- and medium-pressure metapelites, staurolite in metabasites is stable at medium- and high-pressure metamorphism. An increase in the proportion of carbon dioxide in the water–carbon dioxide fluid shifts the staurolite-forming mineral reactions to lower temperatures and higher pressures. Al, Fe, Mg, and Ca are the major components of rocks that are critically important for the formation of magnesian staurolite in these rocks, and the contents and ratios of these components are of crucial importance for the stability of staurolite in metabasites. To understand the processes forming the mineral in metabasites, it is instrumental to subdivide metabasites into subgroups of predominantly magnesian, ferruginous–magnesian, and ferruginous protoliths. With regard to this subdivision, three petrochemical modules are proposed in the form of ratios of major components: MgO/CaO, CaO/FM, and Al2O3/FM, based on which it is possible to predict the stability of staurolite in mafic rocks at appropriate P–T parameters of metamorphism.

Abstract Image

变质岩中的小晶石:P-T-X参数和主要成分比值作为小晶石稳定性的判据
铁镁双晶石是中温高铝偏长岩中常见的典型矿物,镁质双晶石仅在变质基性岩(变质岩)中相对较少发现。通过热力学模拟和矿物形成过程的共同特征分析,确定了控制变质岩中橄榄石稳定性的最重要因素。相对于中、低压变质岩中的橄榄石,变质岩中的橄榄石在中、高压变质作用下是稳定的。水-二氧化碳流体中二氧化碳比例的增加使形成星黄岩的矿物反应转向更低的温度和更高的压力。Al、Fe、Mg和Ca是岩石的主要成分,它们对镁质小沸石的形成起着至关重要的作用,其含量和比例对变质岩中小沸石的稳定性起着至关重要的作用。为了了解变质岩中矿物的形成过程,将变质岩细分为主要为镁质原岩、含铁-镁质原岩和含铁原岩的亚群是很有帮助的。在此基础上,提出了MgO/CaO、CaO/FM和Al2O3/FM三个主要组分比值的石化模块,并以此为基础,在适当的变质P-T参数下,预测基性岩中橄榄石的稳定性。
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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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