THE FORMATION AGES OF THE DUCTILE DEFORMATION BELTS IN THE BASEMENT OF THE CENTRAL TANLU FAULT ZONE IN CENTRAL SHANDONG
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摘要: 郯庐断裂中段鲁中基底的韧性变形带可分为两类：（１）北东向韧性变形带，以发育中深层次的构造片麻岩为特征，形成于早中元古代花岗质岩体（２４８８Ｍａ）侵位之前；（２）北北东向韧性变形带，以中浅层次糜棱岩为特征，形成于晋宁期（９４１Ｍａ）。文中对以上两类韧性变形带的形成机制和时代进行了初步讨论。Abstract: The ductile deformation belts in the basement of the central Tanlu fault zone in central Shandong can be divided into two types: （1） NE trending ductile deformation belts, which were formed before the emplacement of the Early and Middle Proterozoic granitic intrusives （2 488 Ma） and are characterized by the development of the middle and deep level tectonic gneisses; and （2） NNE trending ductile deformation belts, which were formed in the Jinningian movement （941 Ma） accompanied by the development of middle and shallow level mylonites. A preliminary discussion is made on the formation mechanism and ages of the above mentioned two types of ductile deformation belts.
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Key words:
- Tanlu fault /
- ductile deformation zone /
- gneiss /
- mylonite /
- Proterozoic /
- Jinningian
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