| 赣西北地区中元古界双桥山群沉积学特征 |
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| 引用本文： | 黄修保,余忠珍,邹国庆.赣西北地区中元古界双桥山群沉积学特征[J].地质通报,2003,22(1):43-49. |
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| 作者姓名： | 黄修保 余忠珍 邹国庆 |
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| 作者单位： | 中国地质调查局天津地质矿产研究所,天津,300170 |
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| 基金项目： | 地质矿产部人才基金项目(9820)，中国地质调查局攻关项目(950200803) |
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| 摘 要： | 滩间山群是指出露于青藏高原北部柴达木盆地北缘的一套早古生代的浅变质火山岩-沉积岩地层。变质火山岩主要由玄武岩、玄武安山岩组成,夹少量变质英安岩。变质沉积岩主要由绢云片岩、含炭绢云片岩、大理岩以及砂岩、砾岩组成。前人认为这套地层的时代为晚奥陶世。野外地质研究发现,这套地层遭受多期强烈构造变形和低绿片岩相变质作用的改造。同位素年代测试显示,其中变质英安岩的单颗粒锆石U-Pb测年的上交点年龄为(953±27)Ma,下交点年龄为(486±13)Ma,结合锆石形态特征以及区域地质资料分析,认为滩间山群的时代应为早奥陶世。
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| 关 键 词： | 同位素年代学 锆石U－Pb年龄 大陆裂谷 滩间山群 青藏高原 早奥陶世 变质沉积岩 |
| 文章编号： | 1671-2552(2003)01-0028-04 |
| 修稿时间： | 2001年11月10 |
Redefining of the Hanmushan Group in Longshoushan, central-western Gansu Province |
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| XIAO Pei-xi,YOU Wei-feng,CAO Xuan-duo,HU Yun-xu,XIE Cong-rui.Redefining of the Hanmushan Group in Longshoushan, central-western Gansu Province[J].Geologcal Bulletin OF China,2003,22(1):43-49. |
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| Authors: | XIAO Pei-xi YOU Wei-feng CAO Xuan-duo HU Yun-xu XIE Cong-rui |
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| Abstract: | Based on the information of sedimentary structure, fossils and metamorphic-deformation, the authors hold that the Shaohuotonggou Formation in the lower part of Hanmushan Group, which has high-grade metamorphic conglomerate, fine-grained clastic rock and carbonate assemblages, was formed in Sinian. Whereas the Caodaban Formation in the upper Hanmushan Group, which is characterized by clastic rock and carbonate assemblage of relatively low-grade metamorphism, was formed in Cambrian. The Caodaban Formation is comparable with the Lower and Middle Cambrian strata in the western margin of Ordos basin. |
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| Keywords: | zircon U-Pb age continental r ift Tanjianshan Group Qinghai-Tibet Plateau |
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