Stoichiometric Reactions Describing Serpentinization of Anhydrous Primary Silicates: A Critical Appraisal, with Application to Aqueous Alteration of Chondrule Silicates in CM Carbonaceous Chondrites
Stoichiometric Reactions Describing Serpentinization of Anhydrous Primary Silicates: A Critical Appraisal, with Application to Aqueous Alteration of Chondrule Silicates in CM Carbonaceous Chondrites
复制标题
描述无水初生硅酸盐蛇纹石化的化学计量反应：批判性评价，应用于 CM 碳质球粒陨石中球粒硅酸盐的水蚀变
作者：
M. Velbel
已经提出了一些化学反应(质量作用表达式)来描述陆地蛇纹岩中橄榄石的蛇纹岩化作用。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。在CM碳质球粒陨石中，广泛使用的橄榄石+辉石→蛇纹石(OL+Px→SRP)反应与观测到的橄榄石与辉石、橄榄石与蛇纹石的比值在定量上不一致。50ol→2srp的反应与在CM球粒陨石中粗橄榄石之后蛇纹石的个别部分和完全假象的织构观察、CM球粒陨石中反应物和产物矿物的模式丰度的协变以及实验的地球化学动力学的约束最为一致。此外，50ol→2srp反应提供了CM碳质球粒陨石水蚀变环境中溶质物种的流动性。
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.
CM2 碳质球粒陨石中水蚀变的扩展年表：来自亚历山德拉皇后山脉 93005 碳酸盐的证据
影响因子：
5
作者：
Lee M
通讯作者：
Lee M