Apatite stability under different oxygen fugacities relevant to planetary bodies
Apatite stability under different oxygen fugacities relevant to planetary bodies
复制标题
与行星体相关的不同氧逸度下磷灰石的稳定性
DOI：
10.1007/s00710-018-0602-y
复制
发表时间：
2018
影响因子：
1.8
通讯作者：
Wang, Yanling
中科院分区：
文献类型：
--
作者：
Trail, Dustin;Wang, Yanling
磷灰石广泛分布在地球和地外环境中，因此可能会在地球上相对氧化的环境中结晶，并在月球等较少的环境中结晶。我们介绍了一系列氧逸度缓冲磷灰石稳定性和磷灰石-流体溶解度实验，分别在1℃大气压和活塞柱中进行。第一种类型的实验包括将抛光的杜兰戈磷灰石平板用固态氧逸度缓冲器包裹在真空硅管中，然后加热到~1100℃，加热65或90小时。当氧逸度等于或低于Fe-FeO平衡时，晶体经常以卷曲的形式发生变化，这可能与磷灰石成分P2O5在还原条件下的稳定性有关。与在氧化条件下进行的类似实验相比，在还原条件下从加热到1350°C的单斜辉石优先蒸发P2O5也支持这一解释。在活塞筒装置中进行了15次溶解度实验，温度为900℃或925°C，压力为1 Gpa，在~3.4N氯化钠或2.5N氢氧化钠溶液中。氧逸度被缓冲在铁闪石磁铁矿石英平衡(FMQ-4)以下约4个对数单位到这个缓冲器(FMQ + 8)以上的8个对数单位。磷灰石的溶解度由晶体失重率决定。在H2O-NaOH流体中，对溶解度与氧逸度之间没有系统的敏感性。在最易氧化的实验条件下，磷灰石在H2O-NaC l流体中的溶解度降低了约2倍。与其他研究中探索的密集变量相比，这种溶解度的变化相对微妙，如温度、压力和液体中的XNaClin。总体而言，磷灰石的晶体结构在一系列不同的施加氧逸度下都具有弹性，这与另一种磷酸盐独居石的实验结果形成了鲜明对比。
Apatite is widely distributed in terrestrial and extraterrestrial environments and may therefore crystallize in relatively oxidized environments found here on Earth, and in reduced settings such as the Moon. We present a series of oxygen fugacity-buffered apatite stability and apatite-fluid solubility experiments conducted at 1 atm and in a piston cylinder, respectively. The first style of experiments involved enclosing polished slabs of Durango apatite in evacuated silica tubes with a solid-state oxygen fugacity buffer, followed by heating to ~1100 °C for 65 or 90 h. At oxygen fugacities equal to and lower than the Fe-FeO equilibrium, crystals revealed alteration often in the form of convoluted features, which may to be related to the stability of the apatite component P2O5under reducing conditions. Preferential evaporation of P2O5from a haplobasalt heated to 1350 °C under reducing conditions – compared to similar experiments conducted under oxidizing conditions – also supports this interpretation. Fifteen solubility experiments were conducted in a piston cylinder device at 900 or 925 °C and 1 GPa, in either ~3.4 N NaCl or 2 N NaOH fluids. The oxygen fugacity was buffered at about 4 log units below the fayalite magnetite quartz equilibrium (FMQ-4) to 8 log units above this buffer (FMQ + 8). Apatite solubilities were determined by crystal weight loss. There is no systematic sensitivity to solubility vs. oxygen fugacity in H2O-NaOH fluid. In the H2O-NaCl fluid, apatite is less soluble by about a factor of 2 under the most oxidizing experimental conditions. This change in solubility is relatively subtle when compared to intensive variables explored in other studies, such as temperature, pressure, and XNaClin the fluid. Overall, the apatite crystal structure is resilient across a range of different imposed oxygen fugacities, which contrasts with experimental results for another phosphate, monazite.
登录
查看更多内容
影响因子：
2.7
作者：
H. Förster;D. Harlov
通讯作者：
H. Förster;D. Harlov
影响因子：
3.1
作者：
Chao Zhang;J. Koepke;M. Albrecht;I. Horn;F. Holtz
通讯作者：
Chao Zhang;J. Koepke;M. Albrecht;I. Horn;F. Holtz
流体中独居石的氧化还原控制溶解及其对岩石圈相稳定性的影响
影响因子：
3.1
作者：
D. Trail
通讯作者：
D. Trail
800 °C 和 1.0 GPa 下磷灰石在 H 2 O、KCl-H 2 O、NaCl-H 2 O 中的溶解度：对高品位盐水中 REE 迁移率的影响
影响因子：
3.9
作者：
P. Mair;P. Tropper;D. Harlov;C. Manning
通讯作者：
C. Manning
岩浆磷灰石的挥发物清单（F、Cl、Br、S、C）：一种综合分析方法
影响因子：
3.9
作者：
Wenzel;Whitehouse;Worgard;Stosnach
通讯作者：
Stosnach