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地质论评  2001 

辽河群区域变质特征及其大陆动力学意义

Keywords: 辽河群PTT轨迹大陆动力学区域变质作用造山带底侵-拆沉模型岩浆作用

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Abstract:

辽河群是胶辽吉古元古代造山带的主要组成部分。近年来对其区域变质作用的PTt轨迹研究发现:同一造山带内PTt轨迹具有多样性。进一步研究认为,这一碰撞造山带南、北空间上PTt轨迹的逆向性起因于造山带南、北部的结构构造、变形过程和同变形变质花岗岩空间分布上的差异。就南辽河群和盖县岩组而言,早期、中期变质阶段,因中深部地壳大面积“辽吉花岗岩”的底垫式侵位及其诱发的沉积盖层顺层滑脱减薄作用,变质作用表现为近等压和小幅度增压而温度快速上升的过程;峰期变质阶段,又因收缩挤压增厚,表现为等温升压过程(盖县岩组)或升温升压过程(南辽河群);最后晚期变质阶段,差异剥蚀引起降温降压(盖县岩组)或近等压降温过程(南辽河群)。对北辽群而言,早期、中期变质阶段,因盖层南辽河群及盖县岩组的大规模向北滑覆增厚作用而及花岗岩浆不发育,仅有正常传导热及放射热,因而△P>△T;峰期变质阶段温、压同时达峰值,之后等温快速降压过程,与构造剥蚀有关;至晚期变质阶段,同盖县岩组一样,经历降温降压过程。通过对比上述北、南辽河群及盖县岩组的大陆动力学过程,表明早期大陆动力学过程正好是一个互为消长的过程,从而也决定了它们的PTt轨迹的逆反性。最后,本文提出了辽河群变质的底侵+拆沉模型。

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