Shock-induced CO2 loss from CaCO3; implications for early planetary atmospheres
Shock-induced CO2 loss from CaCO3; implications for early planetary atmospheres
复制标题
冲击引起的 CaCO3 中的 CO2 损失；
DOI：
10.1016/0012-821x(86)90150-0
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发表时间：
1986
影响因子：
5.3
通讯作者：
T. Ahrens
中科院分区：
文献类型：
--
作者：
M. Lange;T. Ahrens
我们报道了单晶方解石冲击恢复实验的新结果。对样品进行热重分析。这产生了冲击后CO2的最大量、脱碳间隔ΔT和缔合（或蒸发）能ΔEV，用于去除冲击加载方解石中的剩余CO2。冲击后CO2与初始CO2的比较确定了冲击引起的CO2损失作为冲击压力的函数。初始到完全CO2损失发生在100 ~ 170 GPa的压力范围内。后一压力应被视为下限。与含水矿物的结果相似，Δ T和Δ EV随冲击压力的增加而系统地减小。这表明冲击载荷导致结构挥发物的去除和挥发性物质与晶格剩余部分之间的键合减弱。光学和扫描电子显微镜（SEM）揭示了与冲击载荷相关的结构变化。与以前的研究结果相比较，在冲击叶蛇纹石是黑暗的，弥漫性的地区，这可以解决作为高度泡状的地区，用扫描电子显微镜观察。这些地区被解释为代表淬火部分熔体，冲击释放的CO2已injected.The实验结果被用来放置债券模型的影响生产的CO2类地行星吸积过程中。
We report new results of shock recovery experiments on single crystal calcite. Recovered samples are subjected to thermogravimetric analysis. This yields the maximum amount of post-shock CO2, the decarbonization interval,ΔT, and the energy of association (or vaporization),ΔEV, for the removal of remaining CO2in shock-loaded calcite. Comparison of post-shock CO2with that initially present determines shock-induced CO2loss as a function of shock pressure. Incipient to complete CO2loss occurs over a pressure range of∼ 10to∼ 70GPa. The latter pressure should be considered a lower bound. Comparable to results on hydrous minerals,ΔTandΔEVdecrease systematically with increasing shock pressure. This indicates that shock loading leads to both the removal of structural volatiles and weakening of bonds between the volatile species and remainder of the crystal lattice.Optical and scanning electron microscopy (SEM) reveal structural changes, which are related to the shock-loading. Comparable to previous findings on shocked antigorite is the occurrence of dark, diffuse areas, which can be resolved as highly vesicular areas as observed with a scanning electron microscope. These areas are interpreted as representing quenched partial melts, into which shock-released CO2has been injected.The experimental results are used to place bonds on models of impact production of CO2during accretion of the terrestrial planets.