一种非板块深俯冲快折返的柯石英形成新机制——评析“石英—柯石英相变研究中若干问题讨论”一文
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摘要
本文分析评论了嵇少丞等(2010)发表的"石英—柯石英相变研究中若干问题讨论"一文。指出他们对柯石英非俯冲折返新机制的一些误解,对某些热力学、物理学概念,及其在地学问题中的解释理解的不同。分析了机械球磨的作用机制;论证了机械球磨作用本质与构造挤压剪切作用本质的同一性。分析了岩石糜棱岩化过程的两个阶段;讨论了地震波形成柯石英机制的可能性。围绕比较标准问题,论证了高能机械球磨(预处理)能大大降低α-石英转变成柯石英的压力、温度和合成时间,促进柯石英的形成。用小尺度不均匀局域高压微区模型解释了人工合成柯石英的规律性、南极洲天然矿物的行为,柯石英的寄生矿物、岩石——锆石、榴辉岩包裹体、非包裹体的形成。列举事例澄清了"球磨引进的Fe杂质提高柯石英形成压力迟缓合成"的说法;讨论了第二相存在对石英—柯石英转变的影响和"应变禁区"边界区的应力梯度相变驱动力可以形成柯石英问题。指出了机械球磨石英原料预处理和静高压合成柯石英后处理两步法,是一种实验室研究柯石英形成规律的有效物理方法;小尺度不均匀局域高压微区模型和无需板块深俯冲快折返的柯石英形成机制,是一种有希望的柯石英形成新机制。
In this paper, the article of "Discussion on some problems of quartz—coesite phase transition" written by Profs Ji Shaocheng et al.(2010) has been commented,and some misreading of the new mechansm of non-plate deep subduction fast exhumation,as well as some differences in understanding of the thermodynamics, physics concepts and their interpretation in the Earth science studying have been discussed. Analyzed the mechanical milling mechanism of action, and demonstrated the identity in nature between the role of mechanical milling in laboratory and the extrusion-shearing role in the Earth's structure. Discussed the two-stage process of the rocks mylonitization ; Analyzed the mechanism of seismic waves to form coesite possibility. Surrounding the issues of standard for comparison, demonstrated that the pressure, temperature and reaction time of making α-quartz into coesite are greatly reduced and the formation of coesite is promoted due to the α-quartz pre-treatment of high-energy mechanical milling. The uneven local small-scale model of high-pressure micro-zone was used to explain the regularity of synthesized coesite in laboratory,the behavior of natural minerals in Antarctica, and the formation of the parasitic rocks and minerals of coesite, zircon, eclogite inclusions, and non-inclusion. Cited examples to clarify the misreading of " Fe impurities introduced by ball milling to increase the formation pressure of coesite and delay its synthesis"; discussed the effect of existence of second phase matter on quartz—coesite transition,and the problem that the stress gradient driving force at border zone (not center zone) of strain forbidden zone can promote the coesite to form. Showed the two-step systhesis method of the mechanical milling pre-treatment of raw materials quartz combining the static high-pressure coesite synthesized post-processing is an effective physical method of laboratory study the formation regularity of coesite in the Earth's structure; and the model of uneven local high-pressure micro-zone and the mechansm of non-plate deep subduction fast exhumation would be a promising new mechanism for the formation of coesite in the Earth's crust.
引文
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