江苏宜兴东岭逆冲断层带的构造地球化学特征研究

TECTO-GEOCHEMISTRY OF THE THRUST ZONE AT DONGLING,YIXING, JIANGSU

宜兴东岭逆冲断层带是一条脆性剪切带，断层带内不同变形程度的断层岩在构造地球化学特征上有明显的集散规律，随着岩石变形程度的增加，SiO2的含量相对降低，除FeO以外的其它主元素和除Li以外的微量元素则相对富集，即在断层岩变形过程中，SiO2自变形相对强烈的断层带中心向两侧的硅化带迁移，除FeO和Li之外的其它主元素和微量元素则自断层带两侧向中心迁移。这种迁移趋势是受各元素本身构造地球化学特性所制约。

The Dongling thrust zone is a britte shear zone. Obvious tecto geochemical rules are noticedfor the concentration and dispersion of fault rocks subjected to varying degrees of deformation inthis thrust zone. With increasing deformation level, the SiO2 content tends to decrease,and theother major elements and most trace elements tend to be concentrated with the exception of FeOand Li. Remove of SiO2 from the centre to the margins and of the other major elements and mosttrace elements from the margins to the centre with the exception of FeO and Li in the profile sec-tion of the fault zone is a tendency controlled by tecto-geochemical properties of the elementsthemselves.