Impact-induced water loss from serpentine, nontronite and kernite
Impact-induced water loss from serpentine, nontronite and kernite
复制标题
蛇纹石、绿脱石和核岩由撞击引起的失水
DOI：
10.1016/j.icarus.2014.11.008
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发表时间：
1980
期刊：
影响因子：
3.2
通讯作者：
T. Ahrens
中科院分区：
文献类型：
--
作者：
M. Boslough;R. Weldon;T. Ahrens
对矿物中挥发分的冲击释放进行了初步实验研究。利用红外吸收和X-射线粉末衍射仪技术，观察到了含水矿物在冲击作用下结合水的损失。采用一维冲击混响技术，对蛇纹石(Mg_3Si_2O_5(OH)_4)和非硬沸石(0.5Ca(0.7)Fe4/(Si(7.3)Al(0.7))O_20/(OH)_4·nH_2O)进行了冲击，并在高达38 Gpa的压力下恢复。核石(Na2B4O7.4H2O)被一颗速度为4.89公里/秒的球状焦煤弹丸撞击，产生了约33 Gpa的峰值压力。红外吸收光谱表明，这三种矿物的部分结合水是由于冲击压缩和随后的稀化而释放出来的。这一证据得到了从冲击到23.5 Gpa的蛇纹岩和冲击到18 Gpa的非硬质岩中回收少量水蒸气的支持。回收的水蒸气被推断为来自受冲击矿物的水。X-射线衍射谱表明，两种硅酸盐的晶胞尺寸没有大的变化，只是非硬沸石的c方向的晶格常数减小了，这与层间水的损失一致。
Preliminary experiments have been conducted to study shock-release of volatiles from minerals. Impact-induced loss of bound water from hydrous minerals has been observed, using infrared absorption and X-ray powder diffractometer techniques. Serpentine (Mg3Si2O5(OH)4) and nontronite (.5Ca(0.7)Fe4/(Si(7.3)Al(0.7))O20/(OH)4.nH2O) were shocked and recovered from pressures of up to 38 GPa, using one-dimensional shock reverberation techniques. Kernite (Na2B4O7.4H2O) was impacted by a spherical pyrex projectile traveling at 4.89 km/sec, which produced a peak pressure of approximately 33 GPa. The infrared absorption spectra indicate that some of the bound water from these three minerals was released as a result of shock compression and subsequent rarefaction. This evidence is supported by the recovery of small amounts of vapor from the serpentine shocked to 23.5 GPa and the nontronite shocked to 18 GPa. The recovered vapor is inferred to be water from the shocked minerals. X-ray diffraction spectra indicate no major changes in the unit cell dimensions of the two silicates, except for a decrease in the lattice constant in the c-direction of the nontronite, consistent with the loss of interlayer water.