地质温度计在桂东南那卜韧性剪切带花岗质糜棱岩中的适用性
辛良伟 , 李赛赛 , 冯佐海 , 刘兴源 , 吴江波 , 王秋宇
地球科学 ›› 2024, Vol. 49 ›› Issue (06) : 1946 -1965.
地质温度计在桂东南那卜韧性剪切带花岗质糜棱岩中的适用性
Applicability of Geothermometer to Granitic Mylonites in Nabu Ductile Shear Zone, Southeast Guangxi
,
糜棱岩的变质变形温度测定对其变形演化过程和热年代学同位素定年结果解释具有重要的意义.本文仅讨论各地质温度计在那卜韧性剪切带中的适用性.利用糜棱岩中的矿物组合、矿物动态重结晶特征以及EBSD(electron back-scattered diffraction)石英<c>轴组构等塑性变形特征,估算出那卜韧性剪切带的变质变形温度范围为400~550 ℃.在电子探针分析技术基础上,利用绿泥石成分地质温度计、白云母-绿泥石地质温度计以及白云母/黑云母Ti温度计对那卜韧性剪切带中的花岗质糜棱岩样品进行变质变形温度计算,获得相应的温度分别为305~325 ℃、390~500 ℃、395~492 °C和473~565 ℃、431~574 °C.通过对比分析发现,利用绿泥石成分地质温度计获得的结果明显低于利用塑性变形特征估算出的温度范围和其他温度计的计算结果,结合前人研究结果表明其仅适用于低温变质变形作用的温度计算;而另外3种温度计获得的结果在误差范围内均位于利用塑性变形特征估算出的温度范围内,表明其均适用于该剪切带的变质变形温度计算.其中白云母-绿泥石地质温度计适用于低温糜棱岩,白云母/黑云母Ti温度计适用于相对高温的糜棱岩.
糜棱岩 / 韧性剪切带 / 地质温度计 / 变质变形温度 / 那卜镇 / 构造地质.
mylonitization / ductile shear zone / geothermometer / metamorphic deformation temperature / Nabu Town / tectonics
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