藏南泽当卡多地区中生代放射虫动物群研究及其地质意义
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摘要
雅鲁藏布江蛇绿岩带一直以来被认为是新特提斯洋岩石圈的残留,其与雅鲁藏布江缝合带内相关的海相地层共同记录了新特提斯洋的演化过程以及印度—欧亚板块的碰撞过程。位于藏南泽当西南卡多附近的硅质岩剖面中发现有保存较好的中生代放射虫化石,鉴定出放射虫31属39种,识别出4个放射虫组合,并将之与邻区及西特提斯地区放射虫化石带进行对比确定其时代:Alievium longispineum-Transhsuum maxwelli组合,晚巴通期—早卡洛夫期; Hsuum maxwelli-Triactoma mexicana组合,晚卡洛夫期—牛津期; Holocryptocapsa hindei-Hiscocapsa grutterinki组合,晚巴雷姆期—早阿普特期; Hemicryptocapsa polyhedra-Obeliscoites giganteus组合,晚阿尔布期—赛诺曼期。卡多硅质岩中所含放射虫组合可为泽当蛇绿岩的形成时限及新特提斯洋的演化提供重要的微体古生物依据。
The Yarlung-Zangbo Ophiolite Zone has long been considered as the lithospheric residual of Neo-Tethys,jointly with the marine stratum within the Yarlung-Zangbo Suture Zone,recorded the evolution of the NeoTethys and the collision between India Plate and Eurasian Plate. Moderate preserved Mesozoic radiolarian fossils have been found from the Kaduo Chert,near the southwest of the Zedang of southern Tibet. And 39 radiolarian species belonging to 31 genera have been identified preliminary. Four radiolarian assemblages have been recognized as follows in ascending: Alievium longispineum-Transhsuum maxwelli assemblages( Late Bathonian-Early Callovian),Hsuum maxwelli-Triactoma mexicana assemblages( Late Callovian-Oxfordian),Holocryptocapsa hindei-Hiscocapsa grutterinki assemblages( Late Barremian-Early Aptian) and Hemicryptocapsa polyhedra-Obeliscoites giganteus assemblages( Late Albian-Cenomanian). The radiolarian assemblages in the Kaduo chert can provide an important micropaleontological evidence for the formation time constrain on the Zedang ophiolite and the evolution of the Neo-Tethys Ocean.
The Yarlung-Zangbo Ophiolite Zone has long been considered as the lithospheric residual of Neo-Tethys,jointly with the marine stratum within the Yarlung-Zangbo Suture Zone,recorded the evolution of the NeoTethys and the collision between India Plate and Eurasian Plate. Moderate preserved Mesozoic radiolarian fossils have been found from the Kaduo Chert,near the southwest of the Zedang of southern Tibet. And 39 radiolarian species belonging to 31 genera have been identified preliminary. Four radiolarian assemblages have been recognized as follows in ascending: Alievium longispineum-Transhsuum maxwelli assemblages( Late Bathonian-Early Callovian),Hsuum maxwelli-Triactoma mexicana assemblages( Late Callovian-Oxfordian),Holocryptocapsa hindei-Hiscocapsa grutterinki assemblages( Late Barremian-Early Aptian) and Hemicryptocapsa polyhedra-Obeliscoites giganteus assemblages( Late Albian-Cenomanian). The radiolarian assemblages in the Kaduo chert can provide an important micropaleontological evidence for the formation time constrain on the Zedang ophiolite and the evolution of the Neo-Tethys Ocean.
引文
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[22]熊发挥,杨经绥,梁凤华,等.西藏雅鲁藏布江缝合带西段东波蛇绿岩中锆石U-Pb定年及地质意义[J].岩石学报,2011,27(11):3223-3238.
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[24]YANG Q. Techniques in chemically extracting fossil radiolaria[J]. Palaeoworld,1991,1(2):18-24.
[25]O'DOGHERTY L. Biochronology and Paleontology of Mid-Cretaceous Radiolarians from Northern Apennines(Italy)and Betic Cordillera(Spain)[M]. Lausanne:Mémoires de Géologie(Lausanne),1994:1-413.
[26]?PELA Gori?an. Jurassic and Cretaceous Radiolarian Biostratigraphy and Sedimentary Evolution of the Budva Zone(Dinarides,Montenegro)[M]. Lausanne:Mémoires de Géologie(Lausanne),1994:1-177.
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[28]ALEXANDRE N B,PETER O B,KENNET F,et al. Aalenian to Cenomanian radiolaria of the Bermeja complex(Puerto Rico)and Pacific origin of radiolarites on the Caribbean Plate[J].Swiss Journal of Geosciences,2011,104(3):367-408.
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[30]BAK M. Cretaceous radiolaria from Niedzica succession of the Pieniny Klippen Belt in Polish Carpathians[J]. Acta Palaeontologica Polonica,1996,41(1):91-110.
[31]YE G Y,PESSAGNO E A. Upper Bathonian(Middle Jurassic)radiolarians from Snowshoe Formation,east-central oregon,USA[J]. Collection and Research,2013,26:51-175.
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[36]WANG T Y,LI G B,LI X F,et al. Early Eocene radiolarian fauna from the Sangdanlin,southern Tibet:constraints on the timing of initial India-Asia collision[J]. Acta Geologica Sinica,2017,91(6):1964-1977.
[37]王天洋,李国彪,李新发,等.雅鲁藏布江缝合带南缘混杂岩放射虫组合及其地质意义[J].现代地质,2016,30(2):445-454.
[38]刘云龙,李国彪.西藏南部岗巴地区白垩纪化石碳酸盐岩微相与沉积环境研究[J].现代地质,2012,26(1):22-35.
[39]万晓樵,赵文金,李国彪.对西藏岗巴上白垩统的新认识[J].现代地质,2000,14(3):281-286.
[40]旺罗,万晓樵.西藏日喀则地区恰布林组地层及构造背景分析[J].现代地质,1999,13(3):281-286.
[41]MATSUOKA A. Jurassic and Lower Cretaceous radiolarian zonation in Japan and in the western Pacific[J]. Island Arc,1995,4(2):140-153.
[42]李红生,吴浩若.西藏南部白垩系冲堆组的一些放射虫化石[J].微体古生物学报,1985,2(1):61-76.
[43]韦栋梁,夏斌,周国庆,等.西藏泽当蛇绿岩的Sm-Nd等时线年龄及其意义[J].地球学报,2006,27(1):31-34.
[44]刘维亮,夏斌,刘鸿飞,等.西藏泽当蛇绿岩玄武岩SHRIMP锆石U-Pb年龄及其地质意义[J].地质通报,2013,32(9):1356-1361.
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[2]吴浩若.西藏南部下鲁硅质岩晚侏罗世罩笼虫(放射虫)新材料[J].现代地质,2000,14(3):301-307.
[3]朱杰,杜远生,刘早学,等.西藏雅鲁藏布江缝合带中段中生代放射虫硅质岩成因及其大地构造意义[J].中国科学(D辑),2005,35(12):1131-1139.
[4]许波,罗辉.西藏江孜制龙剖面晚侏罗世—早白垩世的放射虫新发现[M]//中国古生物学会第十次全国会员代表大会组委会.中国古生物学会第十次全国会员代表大会暨第25届学术年会——纪念中国古生物学会成立80周年论文摘要集.南京:中国科学院南京地质古生物研究所,2009:181.
[5]MATSUOKA A,YANG Q,KOBAYASHI K,et al. Jurassic-Cretaceous radiolarian biostratigraphy and sedimentary environments of the Ceno-Tethys:records from the Xialu Chert in the YarlungZangbo Suture Zone,southern Tibet[J]. Journal of Asian Earth Sciences,2002,20(3):277-287.
[6]ZIABREV S V,AITCHISON J C,ABRAJEVITCH A V,et al.Precise radiolarian age constraints on the timing of ophiolite generation and sedimentation in the Dazhuqu terrane,Yarlung-Tsangpo suture zone,Tibet[J]. Journal of the Geological Society of London,2003,160:591-599.
[7]ZIABREV S V,AITCHISON J C,ABRAJEVITCH A V,et al.Bainang terrane,Yarlung-Tsangpo suture,southern Tibet:a record of intra-Neotethyan subduction-accretion processes preserved on the roof of the world[J]. Journal of the Geological Society of London,2004,161(5):523-539.
[8]LI G B,WAN X Q,LIU W C,et al. Discovery of Paleogene marine stratum along the southern side of Yarlung Zangbo suture zone and its implications in tectonics[J]. Science in China(Series D):2005,48(5):647-661.
[9]LI G B,WAN X Q,LIU W C,et al. A new Cretaceous age for the Saiqu “mélange”,southern Tibet,evidence from radiolaria[J]. Cretaceous Research,2009,30(1):35-40.
[10]梁银平,何卫红,朱杰,等.西藏南部古近纪放射虫研究进展[J].地质科技情报,2011,30(3):18-24.
[11]钟瀚霆.雅鲁藏布缝合带中侏罗—早白垩世放射虫年代学研究及其对新特提斯洋演化的意义[D].北京:中国地质大学(北京),2016.
[12]王玉净,杨群,松冈笃,等.藏南泽当雅鲁藏布缝合带中的三叠纪放射虫[J].微体古生物学报,2002,19(3):215-227.
[13]陈迪舒,罗辉.藏南雅鲁藏布缝合带中新发现的三叠纪放射虫[M]//中国古生物学会第十一次全国会员代表大会组委会.中国古生物学会第十一次全国会员代表大会暨第27届学术年会论文摘要集.南京:中国科学院南京地质古生物研究所,2013:131.
[14]刘实佳,罗辉,陈迪舒,等.藏南泽当金鲁地区晚侏罗世—早白垩世放射虫[J].微体古生物学报,2016,33(3):211-228.
[15]AITCHISON J C,MCDERMID I R C,ALI J R,et al. Shoshonites in southern Tibet record Late Jurassic rifting of a Tethyan intraoceanic island arc[J]. Journal of Geology,2007,115(2):197-213.
[16]MCDERMID I R C,AITCHISON J C,DAVIS A M,et al. The Zedong terrane:a Late Jurassic intra-oceanic magmatic arc within the Yarlung-Tsangpo suture zone, southeastern Tibet[J].Chemical Geology,2002,187(3):267-277.
[17]AITCHISON J C,BADENGZHU,DAVIS A M,et al. Remnants of a Cretaceous intra-oceanic subduction system within the Yarlung-Zangbo suture(southern Tibet)[J]. Earth and Planetary Science Letters,2000,183(1):231-244.
[18]郝杰,柴育成,李继亮.雅鲁藏布江蛇绿岩的形成与日喀则弧前盆地沉积演化[J].地质科学,1999,34(1):4-12.
[19]DAI J,WANG C,POLAT A,et al. Rapid forearc spreading between 130 and 120 Ma:Evidence from geochronology and geochemistry of the Xigaze ophiolite,southern Tibet[J]. Lithos,2013,15(4):1-16.
[20]WANG C,LIU Z,HBERT R. The Yarlung-Zangbo paleo-ophiolite,southern Tibet:implications for the dynamic evolution of the Yarlung-Zangbo suture zone[J]. Journal of Asian Earth Sciences,2000,18(6):651-661.
[21]ZHOU M F,ROBINSON P T,MALPAS J,et al. REE and PGE geochemical constraints on the formation of dunites in the Luobusa ophiolite,southern Tibet[J]. Journal of Petrology,2005,46(3):615-639.
[22]熊发挥,杨经绥,梁凤华,等.西藏雅鲁藏布江缝合带西段东波蛇绿岩中锆石U-Pb定年及地质意义[J].岩石学报,2011,27(11):3223-3238.
[23]PESSAGNO E A,NEWPORT R L. A technique for extracting radiolaria from radiolarian chert[J]. Micropalaeontology,1972,18(2):231-234.
[24]YANG Q. Techniques in chemically extracting fossil radiolaria[J]. Palaeoworld,1991,1(2):18-24.
[25]O'DOGHERTY L. Biochronology and Paleontology of Mid-Cretaceous Radiolarians from Northern Apennines(Italy)and Betic Cordillera(Spain)[M]. Lausanne:Mémoires de Géologie(Lausanne),1994:1-413.
[26]?PELA Gori?an. Jurassic and Cretaceous Radiolarian Biostratigraphy and Sedimentary Evolution of the Budva Zone(Dinarides,Montenegro)[M]. Lausanne:Mémoires de Géologie(Lausanne),1994:1-177.
[27]O'DOGHERTY L,CARTER E S,DUMITRICA P,et al. Catalogue of Mesozoic radiolarian genera,Part 2:Jurassic-Cretaceous[J]. Geodiversitas,2009,31(2):271-356.
[28]ALEXANDRE N B,PETER O B,KENNET F,et al. Aalenian to Cenomanian radiolaria of the Bermeja complex(Puerto Rico)and Pacific origin of radiolarites on the Caribbean Plate[J].Swiss Journal of Geosciences,2011,104(3):367-408.
[29]TEKIN U K,G?NCüOGLU M C,UZUNCIMEN S. Radiolarian assemblages of Middle and Late Jurassic to early Late Cretaceous(Cenomanian)ages from an olistolith record pelagic deposition within the Bornova Flysch Zone in western Turkey[J]. Bulletin de la Societe Geologique de France,2012,183(4):307-318.
[30]BAK M. Cretaceous radiolaria from Niedzica succession of the Pieniny Klippen Belt in Polish Carpathians[J]. Acta Palaeontologica Polonica,1996,41(1):91-110.
[31]YE G Y,PESSAGNO E A. Upper Bathonian(Middle Jurassic)radiolarians from Snowshoe Formation,east-central oregon,USA[J]. Collection and Research,2013,26:51-175.
[32]VISHNEVSKAYA V S,DJERIC N,ZAKARIADZE G S. New data on Mesozoic radiolaria of Serbia and Bosnia,and implications for the age and evolution of oceanic volcanic rocks in the central and northern Balkans[J]. Lithosphere,2009,108:72-105.
[33]LI G B,LUBA J,WAN X Q,et al. Discovery of radiolaria from Upper Cretaceous oceanic red beds in Daba,Kangmar and its paleogeographic implication[J]. Palaeogeography,Palaeoclimatology,Palaeoecology,2011,312(1/2):127-137.
[34]LI G B,XIE D,WAN X Q,et al. Discovery of radiolaria from the Zongzhuo Formation in Tianba,Kangmar,Tibet and its age implication[J]. Acta Geologica Sinica,2009,83(5):853-859.
[35]李国彪,万晓樵,刘文灿,等.藏南萨迦县赛区“混杂岩”放射虫的发现及其意义[J].地质通报,2003,22(1):949-955.
[36]WANG T Y,LI G B,LI X F,et al. Early Eocene radiolarian fauna from the Sangdanlin,southern Tibet:constraints on the timing of initial India-Asia collision[J]. Acta Geologica Sinica,2017,91(6):1964-1977.
[37]王天洋,李国彪,李新发,等.雅鲁藏布江缝合带南缘混杂岩放射虫组合及其地质意义[J].现代地质,2016,30(2):445-454.
[38]刘云龙,李国彪.西藏南部岗巴地区白垩纪化石碳酸盐岩微相与沉积环境研究[J].现代地质,2012,26(1):22-35.
[39]万晓樵,赵文金,李国彪.对西藏岗巴上白垩统的新认识[J].现代地质,2000,14(3):281-286.
[40]旺罗,万晓樵.西藏日喀则地区恰布林组地层及构造背景分析[J].现代地质,1999,13(3):281-286.
[41]MATSUOKA A. Jurassic and Lower Cretaceous radiolarian zonation in Japan and in the western Pacific[J]. Island Arc,1995,4(2):140-153.
[42]李红生,吴浩若.西藏南部白垩系冲堆组的一些放射虫化石[J].微体古生物学报,1985,2(1):61-76.
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