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为探讨角闪石变化与低速层的关系,在围压3千巴、温度700℃、应变率为4.4×10~(-5)/秒的条件下,对角闪石进行了三轴压缩实验。 选用角闪石新鲜且量达95—98％的角闪岩,制成直径10毫米、长20毫米的圆柱。在固体介质三轴实验装置中进行实验。实验前先对角闪石进行光学性质测定,该矿物呈暗绿色,具多色性,二轴晶负光性,光轴角78°,折光率N_m=1.666(照1)。根据以上特征确定为普通角闪石,其分子式为(Ca,Na,K_(2-3)Mg,Fe~(2+),Fe~(3+),Al)_5[Si_6(Si,Al)_2O+(22)](OH)_2。
In order to investigate the relationship between amphibole and low velocity layer, triaxial compression experiments were carried out on the amphibole under conditions of confining pressure of 3 kpa, temperature of 700 ℃ and strain rate of 4.4 × 10 -5 / s . The amphibole, fresh and up to 95-98% of amphibole, was selected to make a cylinder 10 mm in diameter and 20 mm in length. Experiments were carried out in a solid media triaxial experimental setup. Before the experiment, the optical properties of amphibole were determined. The mineral was dark green with polychromaticity and negative axiocrystal. The optical axis angle was 78 ° and the refractive index was Nm = 1.666 (illumination 1). According to the above characteristics, it is determined to be a common amphibole with the formula of (Ca, Na, K_ (2-3) Mg, Fe_2 +, Fe_3 +, Al_5 Si_6, _2O + (22)] (OH) _2.