湘西北地区早奥陶世沉积特征及岩相古地理
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摘要
湘西北地区是指位于湖南省内的桃源、沅陵、怀化一线以北及以西的区域。根据2010年以来在区内开展1︰5万区域地质调查项目所取得的剖面资料及填图资料,应用优势相成图法编制了早奥陶世特马豆克期、弗洛早期的岩相古地理图。基于岩相古地理研究表明:沿张家界—古丈—吉首—凤凰一线有古隆起的存在,大致以古隆起为界,两侧沉积分异明显;西北侧属镶边碳酸盐岩台地,沉积地层为桐梓组和红花园组,主要发育局限台地、开阔台地、台地边缘浅滩、台地边缘生物礁、台地斜坡和浅海陆棚6种沉积相和若干亚相、微相;东南侧属浅海陆棚,沉积地层为白水溪组\盘家咀组、桥亭子组,主要有混积陆棚和碎屑陆棚。沉积特征的分析和系列岩相古地理图件的编制,提高了区内下奥陶统的研究程度,同时对金属地质找矿具有一定的指导意义。
Xiangxibei area refers to the northwestern Hunan Province mainly,Taoyuan,Yuanling,Huaihua cities. Lithofacies have been investigated,on the basis of the key Lower Ordovician sections collected during the field mapping projects. The lithofacies palaeogeography maps of the Tremadocian and Floian ages are presented here. The lithofacies palaeogeographic analyses suggest that there was a palaeouplift in areas of Zhangjiajie-Guzhang-Jishou,which shows the significant difference in lithofacies between both sides of the palaeo-uplift. The Tongzi and Honghuayuan Formations were formed on carbonate platform facies in the northwestern of palaeo-uplift,including six types of subfacies,including restricted-platform,open-platform,platform edge, marginal reef of platform, platform slope and shollow sea shelf. The Baishuixi/Panjiazui and Qiaotingzi sormations were formed on the shelf in the southeastern of palaeo-uplift,including two types of facies(i.e.,mixed shelf and clastic shelf). Results from this work improve the un-derstanding of the Early Ordovician,and provide important information for evaluation of geological prospecting in the area.
Xiangxibei area refers to the northwestern Hunan Province mainly,Taoyuan,Yuanling,Huaihua cities. Lithofacies have been investigated,on the basis of the key Lower Ordovician sections collected during the field mapping projects. The lithofacies palaeogeography maps of the Tremadocian and Floian ages are presented here. The lithofacies palaeogeographic analyses suggest that there was a palaeouplift in areas of Zhangjiajie-Guzhang-Jishou,which shows the significant difference in lithofacies between both sides of the palaeo-uplift. The Tongzi and Honghuayuan Formations were formed on carbonate platform facies in the northwestern of palaeo-uplift,including six types of subfacies,including restricted-platform,open-platform,platform edge, marginal reef of platform, platform slope and shollow sea shelf. The Baishuixi/Panjiazui and Qiaotingzi sormations were formed on the shelf in the southeastern of palaeo-uplift,including two types of facies(i.e.,mixed shelf and clastic shelf). Results from this work improve the un-derstanding of the Early Ordovician,and provide important information for evaluation of geological prospecting in the area.
引文
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牟传龙,许效松.2010.华南地区早古生代沉积演化与油气地质条件.沉积与特提斯地质,30(3):24-29.[Mou C L,Xun X S.2010.Sedimentary evolution and petroleum geology in South China during the Early Paleozoic.Sedimentary Geology and Tethyan Geology,30(3):24-29]
牟传龙,葛祥英,许效松,周恳恳,梁薇,王秀平.2014.中上扬子地区晚奥陶世岩相古地理及其油气地质意义.古地理学报,16(4):427-440.[Mou C L,Ge X Y,Xu X S,Zhou K K,Liang W,Wang X P.2014.Lithofacies palaeogeography of the Late Ordovician and its petroleum geological significance in Middle-Upper Yangtze Region.Journal of Palaeogeography(Chinese Edition),16(4):427-440]
彭善池.1991.湖南泸溪特马豆克期三叶虫.古生物学报,30(2):141-166.[Peng S C.1991.Tremadocian trilobites from guotang formation,Luxi,Western Hunan.Acta Palaeontologica Sinica,30(2):141-166]
彭善池.2009.华南斜坡相寒武纪三叶虫动物群研究回顾并论中国南、北方寒武系的对比.古生物学报,48(3):437-452.[Peng SC.2009.Review on the studies of Cambrian trilobite faunas from Jiangnan slope belt,South China,with notes on Cambrian correlation between South and North China.Acta Palaeontologica Sinica,48(3):437-452]
彭善池.2009.华南新的寒武纪生物地层序列和年代地层系统.科学通报,54(18):2691-2698.[Peng S C.2009.The newly-developed Cambrian biostratigraphic succession and chronostratigraphic scheme for South China.Chinese Sci Bull,54(18):2691-2698]
任纪舜.1990.论中国南部的大地构造.地质学报,(4):275-280.[Ren J S.1990.On the geotectonics of Southern China.Acta Geologica Sinica,(4):275-280]
戎嘉余,詹仁斌.1999.华南奥陶-志留纪腕足动物群的更替:兼论奥陶纪末冰川活动的影响.现代地质,13(4):390-394.[Rong J Y,Zhan R B.1999.Ordovician-Silurian brachiopod fauna turnover in South China.Geoscience,13(4):390-394]
舒良树.2012.华南构造演化的基本特征.地质通报,31(7):1035-1053.[Shu L S.2012.An analysis of principal features of tectonic evolution in South China Block.Geological Bulletin of China,31(7):1035-1053]
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