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首页> 外文期刊>Clays and clay minerals >STOICHIOMETRIC REACTIONS DESCRIBING SERPENTINIZATION OF ANHYDROUS PRIMARY SILICATES: A CRITICAL APPRAISAL, WITH APPLICATION TO AQUEOUS ALTERATION OF CHONDRULE SILICATES IN CM CARBONACEOUS CHONDRITES
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STOICHIOMETRIC REACTIONS DESCRIBING SERPENTINIZATION OF ANHYDROUS PRIMARY SILICATES: A CRITICAL APPRAISAL, WITH APPLICATION TO AQUEOUS ALTERATION OF CHONDRULE SILICATES IN CM CARBONACEOUS CHONDRITES

机译：表征无水硅酸盐的硅化的化学计量反应：一种临界评价，其用于在碳共质碳酸盐软骨素中水化硅酸盐

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A number of chemical reactions (mass-action expressions) have been proposed to describe serpentinization of olivine in terrestrial serpentinites. Some have been applied to interpreting the formation of serpentine-group minerals in CM carbonaceous chondrites. The widely used olivine + pyroxene → serpentine (ol + px → srp) reaction is quantitatively inconsistent with observed ratios of olivine to pyroxene and olivine to serpentine in CM carbonaceous chondrites. The reaction of 5ol → 2srp is most consistent with constraints from textural observations at the scale of individual partial and complete pseudomorphs of serpentine after coarse olivine in CM chondrites, observed co-variations in modal abundances of reactant and product minerals in CM chondrites, and experimental geochemical kinetics. Furthermore, the 5ol → 2srp reaction provides insight into the mobility of solute species in the aqueous alteration environment of CM carbonaceous chondrites.
机译：已经提出了许多化学反应（质量作用表达式）来描述陆地蛇纹石中橄榄石的蛇纹石化。一些已被用于解释CM碳质球粒陨石中蛇纹石族矿物的形成。广泛使用的橄榄石+辉石→蛇纹石（ol + px→srp）反应在数量上与在CM碳质球粒陨石中观察到的橄榄石对辉石和橄榄石对蛇纹石的比率不一致。 5ol→2srp的反应与CM球粒石中粗橄榄石后蛇纹石的部分局部和完全假晶形的尺度上的组织学观察的约束，观察到的CM球粒体中反应物和产物矿物的模态丰度的共变以及实验的约束最一致地球化学动力学。此外，5ol→2srp反应提供了对CM碳质球粒陨石水蚀蚀变环境中溶质种类迁移率的见解。

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