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Plastic flow of sphene in high pressure mylonite

机译：高压镍铁矿中细晶的塑性流动

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摘要

Sphene is a common accessory mineral in igneous and metamorphic rocks, It is usually not deformed because it is more competent than the major rock-forming minerals, such as quartz, feldspars and mica. Little is known about the plastic property of sphene. In 1970, Borg reported two sets of mechanical twins in sphene in deformed granite from Harkat and Piledriver nuclear explosions. Sphenes in undeformed granite do not have twinning. Twins are found first at impact pressure of 0.5—0.8 Gpa and differential pressure of 0.1 Gpa, Toward the explosion center, twin frequency increases. Borg determined by using universal stage that the twin planes were K_1={221}, K_2={131}, N_1=<110>, N_2= irrational plane. Borg was able to reproduce mechanical twins in sphene in laboratory at pressure of 0.8 Gpa and a temperature of 25— 500°C, and strain rate of 10~(-6) centre dot s~(-1). No other report has been found in the literature. This note reports the pkstic flow of sphene in naturally deformed mylonite and discusses its deformation condition and geological significance.
机译：Sphene是火成岩和变质岩中常见的辅助矿物，它通常不会变形，因为它比主要的成岩矿物（例如石英，长石和云母）更能胜任。对蝶泳的可塑性知之甚少。 1970年，博格（Borg）报道了哈卡特（Harkat）和打桩机（Piledriver）核爆炸产生的变形花岗岩中的两副机械双胞胎。未变形的花岗岩中的细晶没有孪晶。首先发现双子在0.5-0.8 Gpa的冲击压力和0.1 Gpa的压差下，朝着爆炸中心，双子频率增加。博格通过通用阶段确定孪生平面为K_1 = {221}，K_2 = {131}，N_1 = <110>，N_2 =无理平面。博格在实验室中以0.8 Gpa的压力和25- 500°C的温度以及10〜（-6）中心点s〜（-1）的应变速率能够在镜中复制机械双胎。文献中未发现其他报告。本说明报告了自然变形的硅铁矿中的蝶泳的流动，并讨论了其变形条件和地质意义。

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