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

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。

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

The mylonite from the Gaoligongshan ductile shear zone within the Nujiang fault,western Yunnan is markedly depleted in SiO_2,TiO_2,total Fe and H_2O,and enriched in CaO,MgO,Na_2O and K_2O.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.