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地质通报  2008 

华南东段早古生代造山带研究

Keywords: 早古生代造山带,沉积环境,构造运动学,年代学,构造属性,华南东段

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Abstract:

对华南东段早古生代沉积环境、火山岩、超镁铁岩―镁铁岩年代、韧性变形运动学、早古生代造山带特色等方面进行了研究。研究结果表明,震旦纪―奥陶纪期间(680~440Ma)的沉积岩以泥砂质碎屑岩为主体,岩层中浅海相沉积构造发育;缺乏鲍玛层序,不含火山熔岩和爆发火山碎屑岩;原定早古生代玄武岩实为杂砂岩。结合沉积岩地球化学成果,认为本区早古生代为被动大陆边缘浅海―半深海沉积环境。对区内部分镁铁岩和火山岩作SHRIMP岩浆锆石U-Pb定年,年龄集中在860~800Ma之间。韧性变形运动学研究表明,武夷山南东麓从北西向南东逆冲推覆,北麓从南向北逆冲推覆,剖面上呈花状构造样式。稍后发生了韧性走滑剪切作用。对糜棱岩的云母矿物作40Ar-39Ar定年,年龄集中在430~390Ma之间。与国内外典型加里东期造山带相比,华南早古生代造山带具有鲜明的地域特色,造山机制大致可与西欧比利牛斯造山带相比。

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