重庆万州下侏罗统自流井组湖相遗迹化石新类型及其古环境意义
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摘要
描述在重庆万州区铁峰山下侏罗统自流井组大安寨段首次发现的遗迹化石,鉴定为新种Palaeophycus tiefengshanensis。该种以潜穴表面瘤状凸起特征与较大的潜穴尺寸区别于古藻迹其他遗迹种。遗迹组构分析表明该遗迹化石产出层位的层面生物扰动指数为最高级5,说明原始沉积环境的食物供给充足,氧含量高,造迹生物大量繁盛并活动频繁。根据沉积相变化特征,四川盆地东部地区自流井组沉积期经历了与四川盆地北部地区类似的古环境变迁即湖退过程。两者区别在于四川盆地东部自流井组局部层段可能更适宜底栖动物生存。
The Early Jurassic trace fossil is reported for the first time from the Da'nanzhai Member of the Lower Jurassic Ziliujing Formation in Tiefeng Mountain of Wanzhou,Chongqing.The newlyfound trace fossil is attributed to a new ichnospecies-Palaeophycus tiefengshanensis, which differs from other ichnospecies of Palaeophycus by its large size and nodular surface.Ichnofabric analysis shows that the bedding-plane bioturbation indice of the Palaeophycus ichnofabric is 5 representing the highest level of bioturtation,which suggests abundant food supply,high level of oxygen content and frequent animal activities.Based on the sedimentary facies changes of the Tiefengxiang section,the eastern region of Sichuan Basin experienced a similar environmental transformation of lake regression as the northern region of Sichuan Basin;the differences are the locally more habitable environment for ichnofauna in the studied area.
The Early Jurassic trace fossil is reported for the first time from the Da'nanzhai Member of the Lower Jurassic Ziliujing Formation in Tiefeng Mountain of Wanzhou,Chongqing.The newlyfound trace fossil is attributed to a new ichnospecies-Palaeophycus tiefengshanensis, which differs from other ichnospecies of Palaeophycus by its large size and nodular surface.Ichnofabric analysis shows that the bedding-plane bioturbation indice of the Palaeophycus ichnofabric is 5 representing the highest level of bioturtation,which suggests abundant food supply,high level of oxygen content and frequent animal activities.Based on the sedimentary facies changes of the Tiefengxiang section,the eastern region of Sichuan Basin experienced a similar environmental transformation of lake regression as the northern region of Sichuan Basin;the differences are the locally more habitable environment for ichnofauna in the studied area.
引文
Buatois L A,Mángano M G,Wu X T,Zhang G C,1996.Trace fossils from Jurassic lacustrine turbidites of the Anyao Formation(central China)and their environmental and evolutionary significance.Ichnos,4:287-303.
Chen Lu(陈璐),2014.Study on the Ichnofabrics of Upper Cretaceous Jiaguan Formation from Emei Area of Sichuan.Master's Thesis of Southwest Petroleum University.1-84.
Chrzastek A,2013.Trace fossils from the Lower Muschelkalk of Raciborowice Gorne(North Sudetic Synclinorium,SW Poland)and their palaeoenvironmental interpretation.Acta Geologica Polonica,63(3):315-353.
Fan Yu(范昱),2011.The Characteristics of Sequence Stratigraphy and Sedimentary Filling of Lower Jurassic Ziliujing Formation in the Northeast Area of Sichuan Basin.Master's Thesis of Chengdu University of Technology.1-84.
Hall J,1847.Palaeontology of New York,1.Albany:C.Van Benthuysen.1-338.
James J F,1885.The fucoids of the Cincinnati Group.Pt.2.Journal of the Cincinnati Society of Natural History,7:151-166.
Kan Ze-zhong(阚泽忠),Liang Bin(梁斌),Wang Quan-wei(王全伟),Zhu Bing(朱兵),2005.Trace fossils in the Suining and Penglaizhen formations as buried places of dinosaur fossils,in Anyue,Sichuan,and their environmental significance.Acta Geologica Sichuan(四川地质学报),25(2):68-71(in Chinese with English abstract).
Kim J Y,Keighley D G,Pickerill R K,Hwang W,Kim K S,2005.Trace fossils from marginal lacustrine deposits of the Cretaceous Jinju Formation,southern coast of Korea.Palaeogeography,Palaeoclimatology,Palaeoecology,218:105-124.
Kim J Y,Pickerill R K,Wilson R A,2001.Palaeophycus bolbitermilus isp.nov.from the Early Silurian Upsalquitch Formation of eastern Canada.Atlantic Geology,36:131-137.
Lin Wen-qiu(林文球),Yu Guang-ming(余光明),Wang Cheng-shan(王成善),1982.Jurassic trace fossils and ichnofacies from the Mount Qomolangma region.Journal of Mineralogy and Petrology(矿物岩石),3:20-33.
Miller M F,Smail S E,1997.A semiquantitative field method for evaluating bioturbation on bedding planes.PALAIOS,12:391-396.
Osgood R G,1970.Trace fossils of the Cincinnati area.Palaeontographica Americana,6:277-444.
Pemberton S G,Frey R W,1982.Trace fossils nomenclature and the planolites-Palaeophycus dilemma.Journal of Paleontology,56(4):843-881.
Qiherige(其和日格),1995.Trace fossils from Middle Jurassic Ershierzhan Formation in Mohe area of Heilongjiang.Regional Geology of China(中国区域地质),3:243-244.
Raghavendra P T,Chinmoy R,Paul L L,Jehova M,Victor Z R,Satish J,2011.Trace fossils from Bhuban Formation,Surma Group(Lower to Middle Miocene)of Mizoram India and their palaeoenvironmental significance.Journal of Earth System Science,120(6):1127-1143.
Taylor A,Goldring R,Gowland S,2003.Analysis and application of ichnofabrics.Earth-Science Reviews,60:227-259.
Weber B,Hu S X,Steiner M,Zhao F C,2012.A diverse ichnofauna from the Cambrian Stage 4 Wulongqing Formation near Kunming(Yunnan Province,South China).Bulletin of Geosciences,87(1):71-92.
Yang Shi-pu(杨式溥),1999.Palaeoenvironment and palaeogeographic significance of trace fossils.Journal of Palaeogeography(古地理学报),1(1):7-19.
Yang Shi-pu(杨式溥),Song Zhi-min(宋志敏),Liang Ding-yi(梁定益),1982.Middle Jurassic to Early Cretaceous flysch trace fossils from Ngari region,Tibet.Acta Geologica Sinica(地质学报),4:302-316.
Yang Shi-pu(杨式溥),Zhang Jian-ping(张建平),Yang Mei-fang(杨美芳),2004.Trace Fossils of China.Beijing:Science Press.1-263.
Yao Pei-yi(姚培毅),1984.A new trace fossil genus from Jurassic Longzhaogou in eastern Heilongjiang,China.Regional Geology of China(中国区域地质),10:17-21.
Yong Yun-qiao(雍云乔),2013.Research on Sedimentary Facies of the Lower Jurassic Ziliujing Group in the Yuanba Area of the Northeast Sichuan.Master's Thesis of Chengdu University of Technology.1-65.
Zhang Jian-ping(张建平),Xue Shu-hao(薛叔浩),Yang Shi-pu(杨式溥),Wu Yin-ye(吴因业),2000.Discovery of Jurassic lacustrine trace fossils and their paleoenvironmental significance from Turpan-Hami basin,Xinjiang.Geoscience(现代地质),14(3):373-380.
Zhang Li-jun(张立军),Gong Yi-ming(龚一鸣),Ma Hui-zhen(马会珍),2011.The Devonian trace fossils and ichnofacies from South China.Journal of Palaeogeography(古地理学报),13(4):397-418.
Chen Lu(陈璐),2014.Study on the Ichnofabrics of Upper Cretaceous Jiaguan Formation from Emei Area of Sichuan.Master's Thesis of Southwest Petroleum University.1-84.
Chrzastek A,2013.Trace fossils from the Lower Muschelkalk of Raciborowice Gorne(North Sudetic Synclinorium,SW Poland)and their palaeoenvironmental interpretation.Acta Geologica Polonica,63(3):315-353.
Fan Yu(范昱),2011.The Characteristics of Sequence Stratigraphy and Sedimentary Filling of Lower Jurassic Ziliujing Formation in the Northeast Area of Sichuan Basin.Master's Thesis of Chengdu University of Technology.1-84.
Hall J,1847.Palaeontology of New York,1.Albany:C.Van Benthuysen.1-338.
James J F,1885.The fucoids of the Cincinnati Group.Pt.2.Journal of the Cincinnati Society of Natural History,7:151-166.
Kan Ze-zhong(阚泽忠),Liang Bin(梁斌),Wang Quan-wei(王全伟),Zhu Bing(朱兵),2005.Trace fossils in the Suining and Penglaizhen formations as buried places of dinosaur fossils,in Anyue,Sichuan,and their environmental significance.Acta Geologica Sichuan(四川地质学报),25(2):68-71(in Chinese with English abstract).
Kim J Y,Keighley D G,Pickerill R K,Hwang W,Kim K S,2005.Trace fossils from marginal lacustrine deposits of the Cretaceous Jinju Formation,southern coast of Korea.Palaeogeography,Palaeoclimatology,Palaeoecology,218:105-124.
Kim J Y,Pickerill R K,Wilson R A,2001.Palaeophycus bolbitermilus isp.nov.from the Early Silurian Upsalquitch Formation of eastern Canada.Atlantic Geology,36:131-137.
Lin Wen-qiu(林文球),Yu Guang-ming(余光明),Wang Cheng-shan(王成善),1982.Jurassic trace fossils and ichnofacies from the Mount Qomolangma region.Journal of Mineralogy and Petrology(矿物岩石),3:20-33.
Miller M F,Smail S E,1997.A semiquantitative field method for evaluating bioturbation on bedding planes.PALAIOS,12:391-396.
Osgood R G,1970.Trace fossils of the Cincinnati area.Palaeontographica Americana,6:277-444.
Pemberton S G,Frey R W,1982.Trace fossils nomenclature and the planolites-Palaeophycus dilemma.Journal of Paleontology,56(4):843-881.
Qiherige(其和日格),1995.Trace fossils from Middle Jurassic Ershierzhan Formation in Mohe area of Heilongjiang.Regional Geology of China(中国区域地质),3:243-244.
Raghavendra P T,Chinmoy R,Paul L L,Jehova M,Victor Z R,Satish J,2011.Trace fossils from Bhuban Formation,Surma Group(Lower to Middle Miocene)of Mizoram India and their palaeoenvironmental significance.Journal of Earth System Science,120(6):1127-1143.
Taylor A,Goldring R,Gowland S,2003.Analysis and application of ichnofabrics.Earth-Science Reviews,60:227-259.
Weber B,Hu S X,Steiner M,Zhao F C,2012.A diverse ichnofauna from the Cambrian Stage 4 Wulongqing Formation near Kunming(Yunnan Province,South China).Bulletin of Geosciences,87(1):71-92.
Yang Shi-pu(杨式溥),1999.Palaeoenvironment and palaeogeographic significance of trace fossils.Journal of Palaeogeography(古地理学报),1(1):7-19.
Yang Shi-pu(杨式溥),Song Zhi-min(宋志敏),Liang Ding-yi(梁定益),1982.Middle Jurassic to Early Cretaceous flysch trace fossils from Ngari region,Tibet.Acta Geologica Sinica(地质学报),4:302-316.
Yang Shi-pu(杨式溥),Zhang Jian-ping(张建平),Yang Mei-fang(杨美芳),2004.Trace Fossils of China.Beijing:Science Press.1-263.
Yao Pei-yi(姚培毅),1984.A new trace fossil genus from Jurassic Longzhaogou in eastern Heilongjiang,China.Regional Geology of China(中国区域地质),10:17-21.
Yong Yun-qiao(雍云乔),2013.Research on Sedimentary Facies of the Lower Jurassic Ziliujing Group in the Yuanba Area of the Northeast Sichuan.Master's Thesis of Chengdu University of Technology.1-65.
Zhang Jian-ping(张建平),Xue Shu-hao(薛叔浩),Yang Shi-pu(杨式溥),Wu Yin-ye(吴因业),2000.Discovery of Jurassic lacustrine trace fossils and their paleoenvironmental significance from Turpan-Hami basin,Xinjiang.Geoscience(现代地质),14(3):373-380.
Zhang Li-jun(张立军),Gong Yi-ming(龚一鸣),Ma Hui-zhen(马会珍),2011.The Devonian trace fossils and ichnofacies from South China.Journal of Palaeogeography(古地理学报),13(4):397-418.