| 滇东地区奥陶系红石崖组的时代 |
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| 引用本文： | 张举,张元动,宋妍妍.滇东地区奥陶系红石崖组的时代[J].地层学杂志,2013(1):8-17. |
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| 作者姓名： | 张举 张元动 宋妍妍 |
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| 作者单位： | 中国科学院南京地质古生物研究所,现代古生物学和地层学国家重点实验室 |
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| 基金项目： | 国家科技重点专项任务(2011ZX05008-001-10);国家自然科学基金(No.41172034)联合资助 |
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| 摘 要： | 红石崖组是分布于滇东和川西南地区的一套红色的奥陶纪粗碎屑沉积地层,含笔石、几丁虫和疑源类等化石,过去通常认为其时代为阿仑尼格期(大致相当于当前国际划分的弗洛期和大坪期)。通过对云南禄劝桂花箐水库岸边、禄劝六江和昆明二村红石崖3条剖面的红石崖组进行了较为详细的化石采集,获得了大量笔石标本,鉴定出了2属15种。根据滇东地区红石崖组的笔石动物群,建立Corymbograptus varicosus笔石带,通过与国内外相关笔石动物群的对比分析,该带可与我国黔北地区的Acrograptus filiformis带、英国湖区的Corymbograptus varicosus带以及阿根廷西北部Acoite组的"Baltograptus deflexus带"进行较好对比,其时代应为早奥陶世弗洛期早中期。据此,红石崖组与其上的巧家组之间很可能缺失大坪期地层。
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| 关 键 词： | 生物地层 笔石 红石崖组 奥陶系 滇东 |
GRAPTOLITE FAUNA AND AGE OF THE HUNGSHIHYEN FORMATION ( ORDOVICIAN ) IN EASTERN YUNNAN,SOUTHWEST CHINA |
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| ZHANG Jü , ZHANG Yuan-dong and SONG Yan-yan.GRAPTOLITE FAUNA AND AGE OF THE HUNGSHIHYEN FORMATION ( ORDOVICIAN ) IN EASTERN YUNNAN,SOUTHWEST CHINA[J].Journal of Stratigraphy,2013(1):8-17. |
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| Authors: | ZHANG Jü ZHANG Yuan-dong and SONG Yan-yan |
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| Institution: | State Key Laboratory of Palaeobiology and Stratigraphy , Nanjing Institute of Geology and Palaeontology , Chinese Academy of Sciences , Nanjing210008 |
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| Abstract: | The Hungshihyen Formation is characterized by its reddish , coarse clastics deposits , and is distributed in eastern Yunnan and southwestern Sichuan.The formation contains graptolites , chitinozoans and acritarches and other fossils , based on which the formation has traditionally been regarded as of Arenig ( Floian and Dapingian ) age.Recently , we recollected many graptolites from three sections of the formation in eastern Yunnan , including the Guihuaqing Reservoir bank section and the Liujiang section in Luquan county , and the Hongshiya section near Ercun , Kunming.Some 600specimens have been obtained , which are identified to belong to 2genera and 15species.Based on this graptolite fauna , the Corymbograptus varicosus Zone is identified for the graptolite-bearing interval in the middle part of the formation.The biozone is well correlated with the equivalent Corymbograptus varicosus Zone of Lake District in Britain , the " Baltograptus deflexus Zone " in the Acoite Formation of northwestern Argentina , and the Acrograptus filiformis Zone in the northern Guizhou area of Upper Yangtze Region , and is thus of early-middle Floian age , rather than late Floian age as previously regarded.This suggests that the entire Hungshihyen Formation may span only the Floian Stage , representing a relatively short time interval.As the Hungshihyen Formation is overlain by the Qiaojia Formation , which is of Darriwilian age , it seems likely that Dapingian strata are largely absent in the region. |
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| Keywords: | biostratigraphy graptolite Hungshihyen Formation Ordovician Yunnan |
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