Strike-Slip tectonics along the Tan-Lu fault system, East Asia

东亚郯庐断裂系走滑构造

• 批准号: 07045014
• 负责人: MIYATA Takao
• 金额: $ 2.69万
• 依托单位: KOBE UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07045014/
• 关键词: Tan-Lu fault system; sinistral movement; strike-slip tectonics; pull-apart basin; red sandstone; Paleomagnetic analysis; Late Cretaceous; East China; タンル-断層; 白亜紀堆積盆; 断層岩; 古地磁気; 中国山東省; 華南ブロック; 中国福建・広東省

The Tancheng-Lujiang (Tan-Lu) fault system is the biggest strike-slip fault in East Asia. We have been investigating it from Shandong to Guangdong since 1995. The following results were obtained : (1) The resultant VGPs suggest that the central Zhejian along the Tan-Lu fault system has a counterclockwise rotation against the other regions in the Huanan block, based on paleomagnetic analysis of the Lower to Upper Cretaceous strata (red sandstones and siltstones). The mean VGP position of the Early Cretaceous is more variable than that of the Late Cretaceous. (2) There is evidence for a predominant left-lateral strike-slip movement along the Tan-Lu fault zone ; i.e., left-hand en echelon folds, asymmetrical minor structures and almost-horizontal striations. (3) The fault rock of the Tan-Lu fault zone in Shandong Province is composed mainly of fault breccia and cataclasite, but not mylonite. The Tertiary basalt covers with the fault rock, but is not cut by the main fault F_3 of the Tan-Lu fault zone. And (4) The depocenter of the Early Cretaceous (82Ma FT zircon age) Mazhan basin migrates parallel to the strike of the main fault. Judging from the above-noted features, it is concluded that the Tan-Lu fault system moved horizontally during the Late Cretaceous, and the pull-apart basin was formed at the releasing bend along its main fault due to the strike-slip movement.

郯庐断裂系是东亚最大的走滑断裂。自1995年以来，我们一直在从山东到广东进行调查。研究结果表明：（1）对下白垩统和上白垩统红砂岩和粉砂岩的古地磁分析表明，浙中地区沿着郯庐断裂系相对于华南地块其他地区有逆时针旋转运动。早白垩世的平均VGP位置比晚白垩世的变化更大。(2)有证据表明，沿郯庐断裂带沿着有一个主要的左旋走滑运动;即，左旋雁列褶皱、不对称的小构造和几乎水平的条痕。(3)山东省郯庐断裂带断层岩主要由断层角砾岩和碎裂岩组成，不含糜棱岩。第三纪玄武岩覆盖在断层岩上，但不被郯庐断裂带的F_3主断层切割。马站盆地早白垩世（82 Ma）锆石FT年龄的沉积中心沿主断裂走向迁移。综合上述特征，认为晚白垩世期间郯庐断裂系统发生水平运动，走滑运动在其主断裂的释放弯曲沿着部位形成拉分盆地。

项目成果

Miyata,T.,Morinaga,H.,Inokuchi,H.and Liu,Y.: "Cretaceous strike-slip event in east China. In “The Cretaceous System in Aast and South Asia"" Kyushu Univ.(発表予定),

Miyata, T., Morinaga, H., Inokuchi, H. 和 Liu, Y.：“中国东部的白垩纪走滑事件”，《阿斯特和南亚的白垩纪系统》（待发表） ,

洪 景鵬 他2名: "Formation of the Mazhan Basin and its relationship to the Tan-Lu Fault Zone, east China (in Chinese)" 地質力学学報. no.2(印刷中). (1998)

洪景鹏等2：“中国东部马站盆地的形成及其与郯庐断裂带的关系”，地质力学通报第2期（正在出版）。

林 愛明 他2名: "Tectonic characteristics of the Tancheng-Lujiang fault zone in the central segment,Shangdong Province,eastern China" Tectonophysics. (印刷中). (1998)

林爱梅等2：“中国东部山东郯庐断裂带中段构造特征”（正在出版）。

洪 景鵬 他2名: "Formation of the Mazhan Basin and its relationship to the Tan-Lu Fault Zone,east China (in Chinese)" 地質力学学報. no.2(印刷中). (1998)

洪景鹏等2：“中国东部马站盆地的形成及其与郯庐断裂带的关系”，地质力学通报第2期（待出版）。

Miyata,T.and Hong,J.: "Evidence for Cretaceous strike-slip basin along the Tanlu Fault Zone.east China" Geology. (原稿準備中).

Miyata, T. 和 Hong, J.：“中国东部郯庐断裂带白垩纪走滑盆地的证据”地质学（手稿准备中）。