构造岩体积应变与质量迁移分析在地质学研究中的意义——以怒江断裂高黎贡山为例

Volume strain and mass transport of tectonite: Implications for geology,with an example from the Gaoligongshan ductile shear zone

摘要: 本文以特提斯构造系怒江断裂高黎贡山韧性剪切带糜棱岩为实例。测试分析表明,在韧性剪切带岩石变形变质前后,SiO₂、TiO₂、全Fe、H₂O等显著贫化,CaO、MgO、Na₂O、K₂O等显著富集;韧性剪切带的发育使原来的片麻岩转变为糜棱岩,原岩质量和体积的变化分别为-29.48%和-26.86%。构造岩的体积应变和质量迁移分析是构造时限年代学和流体/岩石比值研究的中间环节,它还在估算挤压构造带缩短量以及求算碳酸盐岩脱排CO₂资源量等方面具有广泛的应用前景。

Abstract: The mylonite from the Gaoligongshan ductile shear zone within the Nujiang fault, western Yunnan is markedly depleted in SiO₂, TiO₂, total Fe and H₂O, and enriched in CaO, MgO, Na₂O and K₂O. The development of the ductile shear zone has led to the alteration of the pre-existing gneiss into mylonite, with the mass and volume change of the original rocks of -29.48% and -26.86%, respectively. The analysis of volume strain and mass transport of tectonite is an intermediate link of the examination of structural chronology and fluid/rock ratios, and will be widely used in the estimation of shortening volumes of compressional structural zones and the resources.