大地构造相的定义、划分、特征及其鉴别标志

    Definition, classification, characteristics and diagnostic indications of tectonic facies

    • 摘要: 大地构造相是反映陆块区和造山系(带)形成演变过程中,在特定演化阶段、特定构造部位的大地构造环境中,形成的一套岩石-构造组合,是表达大陆岩石圈板块经过离散、聚合碰撞、旋扭等动力学过程而形成的地质构造作用的综合产物,具有恢复与揭示陆块区和造山系(带)的组成、结构、演化与成矿地质背景的功能。根据板块构造理论的基本原理和长期研究中国大陆构造的实践经验,在前人大地构造研究的基础上提出了一个比较系统和详细的大地构造相划分方案。总结了这些大地构造相的基本特征及其鉴别标志,不仅丰富了大陆板块构造研究的内容,而且为区域成矿地质背景和资源预测的研究提供了新的思维和工作方法。大地构造相的鉴别也是厘定大地构造单元属性、划分大地构造演化阶段的重要标志。

       

      Abstract: Tectonic facies is a rock-tectonic association formed in a tectonic setting of a specific tectonic site in a specific evolutionary stage during the formation and evolution of a continental block and a orogenic system (belt) as well as an integrated product of dynamic processes of divergence, convergence, collision and rotation-shear of continental lithosphere plates. It has the function of restoring and revealing the composition, structure, evolution and metallogenic geological setting of continental block regions and orogenic systems (belts). According to the basic principle of the plate tectonic theory and practical experience got in the long-term study of the tectonics of continental China, a relatively systematic and detailed scheme of tectonic facies classification was presented on the basis of the previous tectonic study. The paper summarizes the basic characteristics and diagnostic indications of these tectonic facies. The study not only enriches the content of continental plate tectonic research but also provides a new idea and a new work method for the prediction and study of the regional metallogenic geological setting and resources. Tectonic facies is also an important indication of defining the attributes of tectonic units and determining the phases of tectonic evolution.

       

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