西藏许如错地区古近纪盆地碎屑锆石U-Pb年代学充填记录分析
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摘要
西藏许如错地区在国内鲜有学者研究,仅在少有的区域地质报告中出现。研究区内发育一套古近系碎屑岩沉积——日贡拉组,该地层在研究区局部具有一套火山岩夹层。文章通过对许如错地区古近系日贡拉组碎屑锆石的LA-ICP-MS U-Pb测年分析,结合周边盆地年龄结构及研究区沉积现象,进而追寻盆地沉积物物源和盆地充填记录。研究表明,日贡拉组为一套由粗变细最终又变粗的碎屑岩沉积夹少量火山岩,根据沉积原生构造和宏观剖面判断其主要是扇三角洲-浅湖相-扇三角洲的沉积环境;岩浆成因的碎屑锆石年龄峰值集中在127～134 Ma年龄段内,结合周缘年龄推断日贡拉组物源来自北—北西中部拉萨地块的早白垩世花岗岩。通过对研究区日贡拉组岩石组合、岩石地层序列、物源分析、沉积演化过程以及年代证据等方面的研究,发现日贡拉组的发育处于青藏高原俯冲碰撞隆升阶段和汇聚挤压隆升阶段。
Aimed at exploration of provenance and basin filling records, the authors selected detrital zircons from Rigongla Formation of the Paleogene in the middle part of central Lhasa and conducted LA-ICP-MS detrital zircon U-Pb isotopeanalysis. The result reveals that Rigongla Formation is a kind of classic rocks which evolved from coarse to thin to coarse, with minor interbedded volcanic rocks. Judging from the sedimentary primary structure and the macroscopic section, its sedimentary environment was fan delta and shallow lake facies and fan delta. The peak age of magmatic origin of detrital zircon is concentrated in the 127-134 Ma age section. Combined with perimeter age, it is held that the provenance was from the early Cretaceous granite of NNW-trending central Lhasa block, and it was in the stage of subduction and collision uplift of the Tibetan Plateau and the stage of convergence and uplift.
Aimed at exploration of provenance and basin filling records, the authors selected detrital zircons from Rigongla Formation of the Paleogene in the middle part of central Lhasa and conducted LA-ICP-MS detrital zircon U-Pb isotopeanalysis. The result reveals that Rigongla Formation is a kind of classic rocks which evolved from coarse to thin to coarse, with minor interbedded volcanic rocks. Judging from the sedimentary primary structure and the macroscopic section, its sedimentary environment was fan delta and shallow lake facies and fan delta. The peak age of magmatic origin of detrital zircon is concentrated in the 127-134 Ma age section. Combined with perimeter age, it is held that the provenance was from the early Cretaceous granite of NNW-trending central Lhasa block, and it was in the stage of subduction and collision uplift of the Tibetan Plateau and the stage of convergence and uplift.
引文
Bureau of Geology and Mineral Resources of Tibet Autonomous Region.1993.Regional Geology of Tibet Autonomous Region[M].Beijing:Geological Publishing House(in Chinese with English abstract).
Chu M F,Chung S L,Song B.2006.Zircon U-Pb and Hf isotope constraints on the Mesozoic tectonics and crustal evolution of southern Tibet[J].Geology,34(9):745.
Guynn J H,Kapp P,Pullen A,Heizler M,Gehrels G,Ding L.2006.Tibetan basement rocks near Amdo reveal“missing”Mesozoic tectonism along the Bangong suture,central Tibet[J].Geology,34:505-508.
He Zhonghua,Yang Mingde,Zheng Changqing,Huang Yingcong.2005.Geochemistry of the Indosinian granitoids in the Mamba area,Gangdese belt,Tibet and its tectonic significance[J].Geological Bulletin of China.24(4):354-359(in Chinese with English abstract).
He yuan.2017.Oligocene Basin Record and its Response to the Early Uplift of the Tibetan Plateau in Xurucuo,Tibet[D].Chengdu University of Technology(in Chinese with English abstract).
Jiang Xin,Zhao Zhidan,Zhu Dicheng,Zhang Fengqin,Dong Guochen,Mo Xuanxue,Guo Tieying.2010.Zircon U-Pb geochronology and Hf isotopic geochemistry of Jiangba,Bangba and Xiongba granitoids in western Gangdese,Tibet[J].Acta Petrologica Sinica,26(7):2155-2164.(in Chinese with English abstract).
Li Yandong.2002.New progress in the geoscience study of the Qinghai-Tibet Plateau[J].Geological Bulletin of China,21(7):370-376(in Chinese with English abstract).
Li Yinglie,Wu Xinhe,Wang Rui,Xia Xianghua.2018.New findings of oil and gas in central depression of Lunpola Basin,Tibet[J].Geology in China,45(4):853-854.
Li Yuntong.1984.Stratigraphy of China:Third Series in China[M].Beijing:Geological Publishing House,272-341(in Chinese with English abstract).
Leeder M R,Smith A B,Yin J X.1988.Sedimentology,palaeoecology and palaeo environmental evolution of the 1985 Lhasa to Golmud Geotraverse[J].Philosophical Transactions of the Royal Society London,327(1574):107-143.
Li Jijun,Fang Xiaomin,Pan Baotian,Zhao Zhijun,Song Yougui.2001.Late Cenozoic intensive uplift of Qinghai-Xizang Plateau and it impacts on environments in surrounding area[J].Quaternary Sciences,21(5):381-391(in Chinese with English abstract).
Miall A D.1985.Architectural element analysis:A new method of facies analysis applied to fluvial deposits[J].Earth-Science Review,22(4):261-308.
Miall A D.1996.The Geology of Fluvial Deposits[M].Springer Berlin Heidelberg,582.
Pan Guitang,Ding Jun.2004.Geological Map of Qinghai Tibet Plateau and its Adjacent Areas[M].Beijing:Geological Publishing House(in Chinese with English abstract).
Shi Yaeng,Li Jijun,Li Bingyuan,Yao Tandong,Wang Sumin,Li Shijie,Cui Zhiyou,Wang Fubao,Pan Baotian,Fang Xiaomin,Zhang Qingsong.1999.Uplift of the Tibetan Plateau and East Asia environmental change during late Cenozoic[J].Acta Geographica Sinica,54(1):10-21(in Chinese with English abstract).
Sun Zhuanrong,Dong Guochen,Zhao Zuoxin,Wang Weiqing,Liu Shengqiang.2017.Petrological,geochemical and geochronological features of Lailishan ganitoids in western Yunnan and their genesis of partial melting of crustal soure[J].Geology in China,44(6):1140-1158(in Chinese with English abstract).
Taylor P,Zhu D,Pan G,Chung S,Liao Z.2008.Shrimp zircon age and geochemical constraints on the origin of Lower Jurassic volcanic rocks from the yeba Formation,southern Gangdese,south Tibet shrimp zircon age and geochemical constraints[J].International Geology Review,50(5):442-471.
Wang Liyuan,Zheng Youye,Gao Shunbao,Huang Liangliang,Mao Rongwei.2014.Provenance anlysis and prospecting significane of Oligocene Rigongla Formation in Jiwa Area,Tibet[J].Journal of Jilin University:Earth Science Edition.44(4):1097-1107(in Chinese with English abstract).
Wu F Y,Ji W Q,Liu C Z,Chung S L.2010.Detrital zircon U-Pb and Hf isotopic data from the Xigaze fore-arc basin:Constraints on Transhimalayan magmatic evolution in southern Tibet[J].Chemical Geology,271(1/2):13-25.
Yang Jingsui,Xu Zhiqin,Li Tianfu,Li Huaqi,Li Zhaoli,Ren Yufeng,Xu Xiangzhen,Chen Songyong.2007.Oceanic subduction-type eclogite in the Lhasa block,Tibet,China:Remains of the PaleoTethys ocean basin?[J].Geological Bulletin of China,26(10):1277-1287(in Chinese with English abstract).
Zhai Qingguo,Li Cai,Li Huimin,Wang Tianwu.2005.U-Pb zircon age of leucogranite in the central Gangdese,Tibet and its geological significance[J].Geological Bulletin of China,24(4):349-353(in Chinese with English abstract).
Zhang Kexin,Wang Guocan,Ji Junliang,Luo Mansheng,Kou Xiaohu,Wang Yueming,Xu Yadong,Chen Fenning,Chen Ruiming,Song Bowen,Zhang Jianyu,Liang Yinping.2010.Stratigraphic division and sequence of Paleogene and Neogene in Tibetan Plateau and its response to uplift[J].Science China:Earth Science,40(12):1632-1654(in Chinese with English abstract).
Zhu Dicheng,Pan Guitang,Mo Xuanxue,Wang Liquan,Liao Zhongli,Zhao Zhidan,Dong Guochen,Zhou Changyong.2006.Late Jurassic-Early Cretaceous geodynamic setting in middle-northern Gangdese:New insights from volcanic rocks[J].Acta Petrologica Sinica,22(3):534-546.(in Chinese with English abstract).
Zhu D C,Zhao Z D,Pan G T,Lee H Y,Kang Z Q,Liao Z L.2009.Early cretaceous subduction-related adakite-like rocks of the gangdese belt,southern tibet:products of slab melting and subsequent melt-peridotite interaction?[J].Journal of Asian Earth Sciences,34(3):298-309.
Zhu D C,Zhao Z D,Niu Y L,Mo X X.2011.The Lhasa Terrane:Record of a microcontinent and its histories of drift and growth[J].Earth&Planetary Science Letters,301(1/2):241-255.
和钟铧,杨德明,郑常青,黄映聪.2005.西藏冈底斯带门巴地区印支期花岗岩地球化学特征及其构造意义[J].地质通报,24(4):354-359.
和源.2017.西藏许如错地区古近纪盆地记录及其对高原早期隆升的响应[D].成都理工大学.
姜昕,赵志丹,朱弟成,张凤琴,董国臣,莫宣学,郭铁鹰.2010.西藏冈底斯西部江巴、邦巴和雄巴岩体的锆石U-Pb年代学与Hf同位素地球化学[J].岩石学报,26(7):2155-2164.
李廷栋.2002.青藏高原地质科学研究的新进展[J].地质通报,21(7):370-376.
李英烈,伍新和,汪锐,夏响华.2018.西藏伦坡拉盆地中央凹陷带探获油气[J].中国地质,45(4):853-854.
李云通.1984.中国地层-中国的第三系[M].北京:地质出版社,272-341.
李吉均,方小敏,潘保田,赵志军,宋友桂.2001.新生代晚期青藏高原强烈隆起及其对周边环境的影响[J].第四纪研究,21(5):381-391.
潘桂堂,丁俊.2004.青藏高原及邻区地质图说明书[M].北京:地质出版社.
施雅风,李吉均,李炳元,姚檀栋,王苏民,李世杰,崔之久,王富保,潘保田,方小敏,张青松.1999.晚新生代青藏高原的隆升与东亚环境变化[J].地理学报,54(1):10-21.
孙转荣,董国臣,赵作新,王伟清,刘圣强.2017.滇西来利山花岗岩年代学、地球化学特征及其壳源部分熔融成因[J].中国地质,44(6):1140-1158.
王力圆,郑有业,高顺宝,黄亮亮,毛荣威.2014.西藏吉瓦地区渐新统日贡拉组物源分析及找矿意义[J].吉林大学学报(地球科学版),44(4):1097-1107.
西藏自治区地质矿产局.1993.西藏自治区区域地质志[M].北京:地质出版社.
杨经绥,许志琴,李天福,李化启,李兆丽,任玉峰,徐向珍,陈松永.2007.青藏高原拉萨地块中的大洋俯冲型榴辉岩:古特提斯洋盆的残留?[J].地质通报,26(10):1277-1287.
翟庆国,李才,李惠民,王天武.2005.西藏冈底斯中部淡色花岗岩锆石U-Pb年龄及其地质意义[J].地质通报,24(4):349-353.
张克信,王国灿,季军良,骆满生,寇晓虎,王岳明,徐亚东,陈奋宁,陈锐明,宋博文,张楗钰,梁银平.2010.青藏高原古近纪-新近纪地层分区与序列及其对隆升的响应[J].中国科学:地球科学,40(12):1632-1654.
朱弟成,潘桂棠,莫宣学,王立全,廖忠礼,赵志丹,董国臣,周长勇.2006.冈底斯中北部晚侏罗世-早白垩世地球动力学环境:火山岩约束[J].岩石学报,22(3):534-546.
Chu M F,Chung S L,Song B.2006.Zircon U-Pb and Hf isotope constraints on the Mesozoic tectonics and crustal evolution of southern Tibet[J].Geology,34(9):745.
Guynn J H,Kapp P,Pullen A,Heizler M,Gehrels G,Ding L.2006.Tibetan basement rocks near Amdo reveal“missing”Mesozoic tectonism along the Bangong suture,central Tibet[J].Geology,34:505-508.
He Zhonghua,Yang Mingde,Zheng Changqing,Huang Yingcong.2005.Geochemistry of the Indosinian granitoids in the Mamba area,Gangdese belt,Tibet and its tectonic significance[J].Geological Bulletin of China.24(4):354-359(in Chinese with English abstract).
He yuan.2017.Oligocene Basin Record and its Response to the Early Uplift of the Tibetan Plateau in Xurucuo,Tibet[D].Chengdu University of Technology(in Chinese with English abstract).
Jiang Xin,Zhao Zhidan,Zhu Dicheng,Zhang Fengqin,Dong Guochen,Mo Xuanxue,Guo Tieying.2010.Zircon U-Pb geochronology and Hf isotopic geochemistry of Jiangba,Bangba and Xiongba granitoids in western Gangdese,Tibet[J].Acta Petrologica Sinica,26(7):2155-2164.(in Chinese with English abstract).
Li Yandong.2002.New progress in the geoscience study of the Qinghai-Tibet Plateau[J].Geological Bulletin of China,21(7):370-376(in Chinese with English abstract).
Li Yinglie,Wu Xinhe,Wang Rui,Xia Xianghua.2018.New findings of oil and gas in central depression of Lunpola Basin,Tibet[J].Geology in China,45(4):853-854.
Li Yuntong.1984.Stratigraphy of China:Third Series in China[M].Beijing:Geological Publishing House,272-341(in Chinese with English abstract).
Leeder M R,Smith A B,Yin J X.1988.Sedimentology,palaeoecology and palaeo environmental evolution of the 1985 Lhasa to Golmud Geotraverse[J].Philosophical Transactions of the Royal Society London,327(1574):107-143.
Li Jijun,Fang Xiaomin,Pan Baotian,Zhao Zhijun,Song Yougui.2001.Late Cenozoic intensive uplift of Qinghai-Xizang Plateau and it impacts on environments in surrounding area[J].Quaternary Sciences,21(5):381-391(in Chinese with English abstract).
Miall A D.1985.Architectural element analysis:A new method of facies analysis applied to fluvial deposits[J].Earth-Science Review,22(4):261-308.
Miall A D.1996.The Geology of Fluvial Deposits[M].Springer Berlin Heidelberg,582.
Pan Guitang,Ding Jun.2004.Geological Map of Qinghai Tibet Plateau and its Adjacent Areas[M].Beijing:Geological Publishing House(in Chinese with English abstract).
Shi Yaeng,Li Jijun,Li Bingyuan,Yao Tandong,Wang Sumin,Li Shijie,Cui Zhiyou,Wang Fubao,Pan Baotian,Fang Xiaomin,Zhang Qingsong.1999.Uplift of the Tibetan Plateau and East Asia environmental change during late Cenozoic[J].Acta Geographica Sinica,54(1):10-21(in Chinese with English abstract).
Sun Zhuanrong,Dong Guochen,Zhao Zuoxin,Wang Weiqing,Liu Shengqiang.2017.Petrological,geochemical and geochronological features of Lailishan ganitoids in western Yunnan and their genesis of partial melting of crustal soure[J].Geology in China,44(6):1140-1158(in Chinese with English abstract).
Taylor P,Zhu D,Pan G,Chung S,Liao Z.2008.Shrimp zircon age and geochemical constraints on the origin of Lower Jurassic volcanic rocks from the yeba Formation,southern Gangdese,south Tibet shrimp zircon age and geochemical constraints[J].International Geology Review,50(5):442-471.
Wang Liyuan,Zheng Youye,Gao Shunbao,Huang Liangliang,Mao Rongwei.2014.Provenance anlysis and prospecting significane of Oligocene Rigongla Formation in Jiwa Area,Tibet[J].Journal of Jilin University:Earth Science Edition.44(4):1097-1107(in Chinese with English abstract).
Wu F Y,Ji W Q,Liu C Z,Chung S L.2010.Detrital zircon U-Pb and Hf isotopic data from the Xigaze fore-arc basin:Constraints on Transhimalayan magmatic evolution in southern Tibet[J].Chemical Geology,271(1/2):13-25.
Yang Jingsui,Xu Zhiqin,Li Tianfu,Li Huaqi,Li Zhaoli,Ren Yufeng,Xu Xiangzhen,Chen Songyong.2007.Oceanic subduction-type eclogite in the Lhasa block,Tibet,China:Remains of the PaleoTethys ocean basin?[J].Geological Bulletin of China,26(10):1277-1287(in Chinese with English abstract).
Zhai Qingguo,Li Cai,Li Huimin,Wang Tianwu.2005.U-Pb zircon age of leucogranite in the central Gangdese,Tibet and its geological significance[J].Geological Bulletin of China,24(4):349-353(in Chinese with English abstract).
Zhang Kexin,Wang Guocan,Ji Junliang,Luo Mansheng,Kou Xiaohu,Wang Yueming,Xu Yadong,Chen Fenning,Chen Ruiming,Song Bowen,Zhang Jianyu,Liang Yinping.2010.Stratigraphic division and sequence of Paleogene and Neogene in Tibetan Plateau and its response to uplift[J].Science China:Earth Science,40(12):1632-1654(in Chinese with English abstract).
Zhu Dicheng,Pan Guitang,Mo Xuanxue,Wang Liquan,Liao Zhongli,Zhao Zhidan,Dong Guochen,Zhou Changyong.2006.Late Jurassic-Early Cretaceous geodynamic setting in middle-northern Gangdese:New insights from volcanic rocks[J].Acta Petrologica Sinica,22(3):534-546.(in Chinese with English abstract).
Zhu D C,Zhao Z D,Pan G T,Lee H Y,Kang Z Q,Liao Z L.2009.Early cretaceous subduction-related adakite-like rocks of the gangdese belt,southern tibet:products of slab melting and subsequent melt-peridotite interaction?[J].Journal of Asian Earth Sciences,34(3):298-309.
Zhu D C,Zhao Z D,Niu Y L,Mo X X.2011.The Lhasa Terrane:Record of a microcontinent and its histories of drift and growth[J].Earth&Planetary Science Letters,301(1/2):241-255.
和钟铧,杨德明,郑常青,黄映聪.2005.西藏冈底斯带门巴地区印支期花岗岩地球化学特征及其构造意义[J].地质通报,24(4):354-359.
和源.2017.西藏许如错地区古近纪盆地记录及其对高原早期隆升的响应[D].成都理工大学.
姜昕,赵志丹,朱弟成,张凤琴,董国臣,莫宣学,郭铁鹰.2010.西藏冈底斯西部江巴、邦巴和雄巴岩体的锆石U-Pb年代学与Hf同位素地球化学[J].岩石学报,26(7):2155-2164.
李廷栋.2002.青藏高原地质科学研究的新进展[J].地质通报,21(7):370-376.
李英烈,伍新和,汪锐,夏响华.2018.西藏伦坡拉盆地中央凹陷带探获油气[J].中国地质,45(4):853-854.
李云通.1984.中国地层-中国的第三系[M].北京:地质出版社,272-341.
李吉均,方小敏,潘保田,赵志军,宋友桂.2001.新生代晚期青藏高原强烈隆起及其对周边环境的影响[J].第四纪研究,21(5):381-391.
潘桂堂,丁俊.2004.青藏高原及邻区地质图说明书[M].北京:地质出版社.
施雅风,李吉均,李炳元,姚檀栋,王苏民,李世杰,崔之久,王富保,潘保田,方小敏,张青松.1999.晚新生代青藏高原的隆升与东亚环境变化[J].地理学报,54(1):10-21.
孙转荣,董国臣,赵作新,王伟清,刘圣强.2017.滇西来利山花岗岩年代学、地球化学特征及其壳源部分熔融成因[J].中国地质,44(6):1140-1158.
王力圆,郑有业,高顺宝,黄亮亮,毛荣威.2014.西藏吉瓦地区渐新统日贡拉组物源分析及找矿意义[J].吉林大学学报(地球科学版),44(4):1097-1107.
西藏自治区地质矿产局.1993.西藏自治区区域地质志[M].北京:地质出版社.
杨经绥,许志琴,李天福,李化启,李兆丽,任玉峰,徐向珍,陈松永.2007.青藏高原拉萨地块中的大洋俯冲型榴辉岩:古特提斯洋盆的残留?[J].地质通报,26(10):1277-1287.
翟庆国,李才,李惠民,王天武.2005.西藏冈底斯中部淡色花岗岩锆石U-Pb年龄及其地质意义[J].地质通报,24(4):349-353.
张克信,王国灿,季军良,骆满生,寇晓虎,王岳明,徐亚东,陈奋宁,陈锐明,宋博文,张楗钰,梁银平.2010.青藏高原古近纪-新近纪地层分区与序列及其对隆升的响应[J].中国科学:地球科学,40(12):1632-1654.
朱弟成,潘桂棠,莫宣学,王立全,廖忠礼,赵志丹,董国臣,周长勇.2006.冈底斯中北部晚侏罗世-早白垩世地球动力学环境:火山岩约束[J].岩石学报,22(3):534-546.