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西藏南部有出露良好的海相侏罗—白垩纪地层,对采集自藏南江孜甲不拉沟口剖面甲不拉组的样品进行了高倍显微观察和照相,首次发现了具有地层标志意义的钙质超微化石。通过对化石的进一步鉴定,发现了保存较为完好的早白垩世贝利阿斯期和凡兰吟期的标准分子,还鉴定出了一些具有区域性对比意义的全球性分子和洲际分子。化石整体呈现早白垩世钙质超微生物的组合特征。研究区中生代海相地层钙质超微化石的发现,为藏南海相侏罗—白垩纪界线的厘定提供了新的古生物学证据。
Abstract：The marine strata around the Jurassic—Cretaceous boundary crop out well in southern Tibet.The samples collected from the Jiabula Formation in the Jiabula-Gokou section of Gyangze area were analyzed by the authors under high-resolution microscope.The calcareous zonal nannofossils of Berriasian-Valanginian stages of early Cretaceous were found for the first time in the section.Some global or intercontinental species with regional significance for correlation were also discovered.In general,the nannofossils discovered have the same features of the Early Cretaceous assemblage.The discovery provides new paleontological evidence for delineation of the Jurassic—Cretaceous boundary in southern Tibet.
[1]郝诒纯,茅绍智.微体古生物学教程(第二版)[M].武汉:中国地质大学出版社,1993:85-114.
[2]同济大学海洋微体古生物室.钙质超微化石[M].北京:海洋出版社,1982.
[3]ThiersteinR.Mesozoic calcareous nannoplankton bios-tratigraphy of marine sedi ments[J].Marine Micropaleon-tology,1976(1):325-362.
[4]Mutterlose J,Brumsack H,Fl gel S,et al.The Greenl and Norwegian Seaway:A key area for understanding Late Ju-rassic to Early Cretaceous paleoenvironments[J].Paleo-ceanography,2003,18(10):1 029-1 041.
[5]Tremolada F,Bornemann A,Bralower T J,et al.Paleo-ceanographic changes across the Jurassic/Cretaceous bound-ary:The calcareous phytoplankton response[J].Earth andPlanetary Science Frontiers,2006,241(3-4):361-371.
[6]BarbuV,Melinte M.Latest Jurassic to earliest Cretaceous pa-leoenvironmental changes in the Southern Carpathians,Roma-nia:regional record of the late Valanginian nutrification event[J].Cretaceous Research,2008,29(5-6):790-802.
[7]万晓樵,高莲凤,李国彪,等.西藏江孜—浪卡子一带的侏罗—白垩纪界线地层[J].现代地质,2005,19(4):479-487.
[8]徐钰林,茅绍智.西藏南部白垩纪—早第三纪钙质超微化石及其沉积环境[J].微体古生物学报,1992,9(4):331-345.
[9]钟石兰,周志澄,Willems H,等.西藏南部岗巴地区白垩纪中期钙质超微化石带和Cenomanian—Turonian界线[J].古生物学报,2000,39(3):313-325.
[10]毛国政,王保弟,曾庆高.西藏羊卓雍地区沙堆组超微化石新资料[J].地质通报,2003,22(9):733-735.
[11]杨遵仪,吴顺宝.西藏南部晚侏罗世及早白垩世的若干箭石[J].古生物学报,1964,12(2):180-207.
[12]王义刚,孙东立,何国雄.喜马拉雅地区(我国境内)地层研究的新认识[J].地层学杂志,1980,4(1):55-59.
[13]王乃文.中国白垩纪特提斯地层学问题[C]//地质矿产部青藏高原地质文集编委会.青藏高原地质文集(3).北京:地质出版社,1983:148-180.
[14]刘桂芳,王思恩.西藏喜马拉雅区上侏罗统和下白垩统研究的新进展[C]//中国地质科学院地层古生物论文集编委会.地层古生物论文集(17).北京:地质出版社,1987:143-166.
[15]西藏自治区地质矿产局.西藏自治区区域地质志[M].北京:地质出版社,1993.
[16]Hay W W.Calcareous nannofossils[C]//Ramsay.Oceanic micropaleontology,Volume 1 and 2.Acad.Press,Lon-don,United Kingdom,1977:1 055-1 200.
[17]Cobianchi M,Luciani V,Menegatti A.The Selli Level ofthe Gargano Promontory,Apulia,southern Italy:forami-niferal and calcareous nannofossil data[J].Cretaceous Re-search,1999,20(3):255-269.
[18]Hardenbol J,Thierry J,Farley B,et al.Mesozoic and Cenozoic sequence chronostratigraphic framework of Euro-peau basins[C]//Graciansky D,Hardenbol J,Jacquin T.Mesozoic and Cenozoic sequence stratigraphy of Europeanbasins.SEPMSpec.Publ.1998,60:3-13.
[19]刘桂芳.西藏聂拉木古错地区晚侏罗世至早白垩世菊石群[C]//中国地质科学院.喜马拉雅岩石圈构造演化——西藏古生物论文集.北京:地质出版社,1988:1-65.
[20]Yin J,Enay R.Tithonian ammonoid biostratigraphy ineastern Hi malayan Tibet[J].Geobios,2004,37:667-686.
基本信息:
DOI：10.16028/j.1009-2722.2011.01.006
中图分类号:Q913.2
引用信息:
[1]高莲凤,孙娟,万晓樵,等.西藏南部中生代海相地层钙质超微化石的发现及意义[J].海洋地质前沿,2011,27(01):33-37.DOI:10.16028/j.1009-2722.2011.01.006.
基金信息:
国家自然科学基金(40272007);; 河北省高等学校科学技术研究青年基金(2010248);; 中国地质大学生物地质与环境地质教育部重点实验室开放课题(BGEGF200802);; 现代古生物学和地层学国家重点实验室(中国科学院南京地质古生物研究所)(113108)
2011-01-28
2011-01-28