MATCHING MODE OF NORTH CHINA AND YANGTZE PLATES AND STRAIN CHARACTERISTICS OF THE PALEOZOIC BASIN IN THE NORTH EDGE OF THE YANGTZE PLATE
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摘要: 洋板块的消减及其后两侧陆块的拼合,是板块构造作用的两个不同阶段.分隔扬子与华北两板块的古秦岭洋,于晚志留世向北单边俯冲关闭.根据秦岭造山带内发育的大型推覆体构造组合及其配置关系,推覆体岩片内的变质相倒置、推覆岩片内应变标志物的显微构造特征和应变参数的测量及南秦岭大型泥盆纪—石炭纪前陆盆地的厘定,均一致确证了华北板块与扬子板块于420～380Ma至340～320Ma之间以仰冲兼右行剪切的方式碰撞拼贴.对扬子北缘古生代盆地应变标志物有限应变测量研究表明,扬子北缘古生代盆地从南向北可划分为4个应变量不同的应变区:无应变或弱应变区、强应变区、中等强度应变区和强应变区.应变区划分的构造学意义:a)扬子克拉通北缘是寻找古生代油气藏的有利地区;b)南秦岭造山带是晚加里东和海西-印支运动形成的复合山链.通过对扬子北缘古生代盆地构造变形特征,包括褶皱特征、逆冲-推覆构造特征、应变标志物的应变特征分析,估算南秦岭造山带的构造缩短量为918.8km.Abstract: With history and construction analysis,Prof.Huang Jiqing and other geologists founded "multicycle tectonic movement theory",after long-term research on Chinese earth structure.This theory summarized the basic characteristics of Chinese earth structure,developed the multicycle theory,enriched the theory and research method of Chinese earth structure,and made great contribution in directing national oil and gas prospection.On the occasion of Prof.Huang Jiqing's 100th birthday,the author reviews the oil and gas achievements acquired under the multicycle theory and the further analysis on oil-gas geologic condition of the basin,generation and distribution of oil-gas,and the oil-gas exploration decision during the 50 years' oil-gas exploration in the Ordos Basin,expressing honor and cherish memory for the older generation of geologists.
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Key words:
- amalgamation mode /
- strain characteristics /
- North China plate /
- Yangtze plate
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