新疆柯坪地区奥陶纪印干组珊瑚化石的发现及意义  

Discovery and Geological Significance of the Coral Fossils of Yingan Formation in Keping,Xinjiang

作　　者：韩小梦 张新勇[1] 杨宝忠[2] 孙军刚[1] 周发侨 赵鹏飞[1] 王庆同[1,3,4] 

机构地区：[1]中国人民武装警察部队黄金第七支队,山东烟台264004 [2]中国地质大学(武汉),武汉430074 [3]兰州大学地质科学与矿产资源学院 [4]兰州大学甘肃省西部矿产资源重点实验室,兰州730000

出　　处：《地质科技情报》2017年第2期13-19,共7页Geological Science and Technology Information

基　　金：中国地质调查局西北沿边及特殊地区地质矿产调查二级项目(DD20160079)

摘　　要：新疆柯坪地区印干组笔石及三叶虫化石丰富,已做过较多的工作,但珊瑚化石未见报道。柯坪地区南部柯坪塔格山一带出露完整的印干组,该组顶部首次发现富含珊瑚化石的厚层生物碎屑灰岩,珊瑚经鉴定计有9属14种(含未定种)。该珊瑚动物群中,Agetolites,Heliolites和Streptelasma最为丰富。根据珊瑚动物群特征、垂向变化规律及与邻区的对比,建立了Agetolites-Heliolites-Streptelasma生物组合。就生物组合特征而言,该组合可与浙赣地区三巨山组、准噶尔北部布龙果尔组对应,时代属晚奥陶世钱塘江早期,对应国际凯迪期晚期。就生物古地理特征而言,该动物群分子大部分见于华南地区,属中国南方的阿盖特珊瑚区,表明该区当时与华南相连。There have been many research about the graptolites and trilobites in the Yingan Formation in Keping area, Xinjiang. But corals have been not reported for the moment. A large of coral fossils were found in the thick bioclastic limestone at the top of the Yingan Formation in Kolpingtug Hill of the south- ern Kolping County. There were 9 genera with 14 species （including unspecified species） in total, of which Agetolites, Heliolites and Streptelasrna were the most typical. Base on the characters of the corals, the law of change and the contrast of near region, Agetolites-Heliolites-Streptelasrna assemblage can be estab- lished. The biological combination feature can be compared with the Sanjushan Formation in Zhejiang-Jian gxi area and the Bulonggol Formation in the northern Junggar. Their age belongs the early Qiantang River age, Ordovician, corresponding to the late Kaidi age international. As far as the characteristic of paleobio- geography, they belong to the Arctic coral area of southern China. It indicate the region were joined the southern China at that time.

关 键 词：新疆 柯坪 印干组 珊瑚 意义 

分 类 号：Q911.2[天文地球—古生物学与地层学]