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华南东段早古生代造山带研究
引用本文:舒良树,于津海,贾东,王博,沈渭洲,张岳桥.华南东段早古生代造山带研究[J].地质通报,2008,27(10).
作者姓名:舒良树  于津海  贾东  王博  沈渭洲  张岳桥
作者单位:南京大学地球科学与工程学院,江苏,南京,210093
基金项目:国家自然科学基金项目(编号:.40634022,40572118)、教育部博士点基金项目(编号:20060284008)资助
摘    要: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。

关 键 词: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

Early Paleozoic orogenic belt in the eastern segment of South China
SHU Liang-shu,YU Jin-hai,JIA Dong,WANG Bo,SHEN Wei-zhou,ZHANG Yue-qiao.Early Paleozoic orogenic belt in the eastern segment of South China[J].Geologcal Bulletin OF China,2008,27(10).
Authors:SHU Liang-shu  YU Jin-hai  JIA Dong  WANG Bo  SHEN Wei-zhou  ZHANG Yue-qiao
Institution:School of Earth Sciences and Engineering, Nanjing University
Abstract:The authors performed a systematic study of the Early Paleozoic belt in the eastern segment of South China, including its sedimentary environment, volcanic rocks, ages of mafic-ultramafic rocks, kinematic analysis of ductile deformation and orogenic mechanism. Results suggest that the Sinian-Ordovician sequence (680-440 Ma) consists chiefly of sandstone and mudstones. In the strata neritic sedimentary structure is well developed, without the Bouma sequence, volcanic lavas or explosive pyroclastic rocks. Some originally defined Early Paleozoic basalt is actually graywacke. Based on the aforesaid study, combined with the geochemical features of graywacke, the study area was a neritic-bathyal environment on the passive continental margins during the Early Paleozoic. SHRIMP U-Pb zircon dating of some mafic rocks and volcanic rocks show that their ages cluster at 860-800 Ma. The kinematic pattern of ductile deformation indicates that the southeastern foot of the Wuyi Mountains was overthrust from northwest to southeast, while the northern foot was thrust from south to north, displaying a flower-shaped structural style is displayed in section. Slightly later, strike-slip shearing occurred. The 40Ar-39Ar dating of muscovite and biotite from mylonitic yielded ages in the range from 430 to 390 Ma. By comparing with the typical Caledonian orogens in the world, the Early Paleozoic South China orogenic belt shows distinct local features and the orogenic mechanism is similar to that of the Pyrenean orogenic belt of Western Europe.
Keywords:Early Paleozoic orogenic belt  sedimentary environment  structural kinematics  geochronology  tectonic attribute  eastern South China
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