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地质学报  2005 

念青唐古拉花岗岩的同位素年龄测定及其地质意义

, PP. 331-337

Keywords: K-Ar测年,Rb-Sr等时线测年,锆石SHRIMPU-Pb测年,念青唐古拉花岗岩,青藏高原

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Abstract:

念青唐古拉花岗岩体位于西藏当雄县境内,是拉萨地块中部出露的巨型侵入岩岩基,其面积超过1500km2,以大面积出露的黑云母二长花岗岩为主体。本文分别应用单矿物K-Ar法、全岩-单矿物Rb-Sr等时线法和高灵敏度高分辨率离子探针法(SHRIMP-)对念青唐古拉岩体不同位置上的代表性岩石样品进行同位素测年,得到中细粒黑云母二长花岗岩的K-Ar年龄为8.49±0.14Ma,Rb-Sr等时线年龄为8.07±0.35Ma和8.70±1.40Ma,SHRIMPU-Pb年龄为18.3±0.4Ma;中粗粒黑云母二长花岗岩的K-Ar年龄为9.80±0.35Ma,Rb-Sr等时线年龄为9.33±0.41Ma,SHRIMPU-Pb年龄为11.01±0.24Ma。不同方法测年结果均表明念青唐古拉花岗岩形成于中新世,属拉萨地块内部最年轻的巨型花岗岩岩基,其侵位结晶时代处于青藏高原地壳由南北向挤压增厚向东西向伸展的转变时期,岩浆来源于地壳局部熔融,属后碰撞构造-岩浆活动的产物。

References

[1]  Xiao Qinghui, Deng Jinfu, Ma Daquan, et al. 2002. The ways of investigation on granitoids. Beijing: Geological Publishing House,30~40 (in Chinese).
[2]  Xiao Xuchang, Wang Jun. 1998. A brief review of tectonic evolution and uplift of the Qinghai-Tibet Plateau, Geological Review, 44(4) :372~381 (in Chinese with English abstract).
[3]  Zhao Wenjin, Project INDEPTH Group. 2001. A Geophysics Study on Geological Deep-Structure of the Sutures of the Himalaya Mountain and the Yarlung Zangbo River. Beijing: Geological Publishing House, 327 ~ 349 (in Chinese).
[4]  高锐,李廷栋,吴功建.1998.青藏高原岩石圈演化与地球动力学过程.地质论评,44(4):389-395.
[5]  金成伟,HarrisN B W,许荣华,等.1990.拉萨至格尔木的深成岩,青藏高原地质演化,中英青藏高原综合地质考察.北京:科学出版社,141~172.
[6]  吕庆田,姜枚,马开义,等.1996.三维走时反演与青藏高原深部构造.地震学报,18(4):451-459.
[7]  西藏自治区地质矿产局.1993.西藏自治区区域地质志.北京:地质出版社,388~390.
[8]  肖序常,李廷栋.2000.青藏高原的构造演化与隆升机制.广州:广东科学技术出版社,1~313.
[9]  赵文津及INDEPTH项目组.2001.喜马拉雅山及雅鲁藏布江缝合带深部结构与构造研究.北京:地质出版社,327~349.
[10]  Bureau of Geology and Mineral Resources of Xizang Autonomous Region. 1993. Regional geology of Xizang (Tibet) autonomous region. Beijing: Geological Publishing House, 388 ~ 390 (in Chinese).
[11]  Chen Peirong, Zhou Xinmin, Zhang Wenlan, et al. 2004. The origin and significance of Early Yanshan syenite-granitoids in the Nanling region. Science in China, 34 (6): 493 ~ 503 (in Chinese).
[12]  Gao Rui, Li Tingdong, Wu Gongjian. 1998. Lithospheric evolution and geodynamic process of the Qinghai-Tibet Plateau:Aninspiration from the Yadong-Golmud-Ejin geoscience transect.Geological Review, 44(4):389~395 (in Chinese with English abstract).
[13]  Garzione C N, Dettman D L, Quade J, et al. 2000. Hight times on the Tibetan Plateau: Paleoelevation of the Thakkola graben,Nepal. Geolgy, 28: 339~342.
[14]  Harrison T M, Armstrong R L, Naeser C W. 1979. Geochronology and thermal history of the coast plutonic complex near Prince Rupert, British Columbia. Can. J. Earth Sci. , 16:400~410.
[15]  Harrison T M, Copeland P, Kidd W S F, et al. 1995. Activation of the Nyainqentanghla shear zone: implications for uplift of the southern Tibetan Plateau. Tectonics, 14(3): 658~676.
[16]  Harrison T M, Grove M, Lovera O M, et al. 1998. A model for the origin of Himalaya anatexis and inverted metamorphism. J.Geophys. Res. , 103:27017~27032.
[17]  Lee J K W, Williams I S, Ellis D J. 1997. Pb, U and Th diffusion in natural zircon. Nature, 390: 159~162.
[18]  Liegeois J P, Navez J, Hertogen J, et al. 1998. Contrasting origin of post-collisional high-K calc-alkaline and shoshonitic versus alkaline and peralkaline granitoids. The use of sliding normalization.Lithos. , 45:1~28.
[19]  Lü Qingtian, Jiang Mei, Ma Kaiyi, et al. 1996. Travel time tomography inversion and the deep structure of the southern Tibet. Acta Seismologica Sinica, 18 (4): 451 ~ 459 (in Chinese ).
[20]  Peter M B, Bradley R H, et al. 2001. Normal faulting in central Tibet since at least 13.5 Myr ago. Nature, 412: 628~632.
[21]  Sylvester P J. 1998. Post-collision strongly peraluminous granites.Lithos. , 45: 29 ~ 44.
[22]  Wagner G, Van Den Haute P. 1992. Fission track dating. Dordrecht:Kluwer Academic Publishers, 1 ~275.
[23]  Williams H, Turner S, Kelley S, et al. 2001. Age and composition of dikes in Southern Tibet: New constraints on the timing of eastwest extension and its relationship to postcollisional volcanism.Geologe, 29: 339~342.
[24]  Wu Gongjian, Xiao Xuchang, Li Tingdong. 1989. Yardong-Golmud geoscience transect in Qinghai-Xizang (Tibet) Plateau. Acta Geologica Sinica, 63 (4): 285 ~ 296 (in Chinese with English abstract).
[25]  陈培荣,周新民,张文兰,等.2004.南岭东段燕山早期正长岩-花岗岩杂岩的成因和意义.中国科学,34(6):493~503.
[26]  刘琦胜,吴珍汉,胡道功,等.2003.念青唐古拉花岗岩锆石离子探针U-Pb同位素测年.科学通报,48(20):2170~2175.
[27]  吴功建,肖序常,李廷栋.1989.青藏高原亚东-格尔木地学断面.地质学报,63(4):285~296.
[28]  肖庆辉,邓晋福,马大铨,等.2002.花岗岩研究思维与方法.北京:地质出版社,30~40.
[29]  肖序常,王军.1998.青藏高原构造演化及隆升的简要评述.地质论评,44(4):372~381.
[30]  Achache J, Courrillot V, Zhou Yaoxin. 1984. Paleogeographic and tectonic evolution of southern Tibet since Middle Cretaceous time:new paleomagnetic data and synthesis. J. Geophys. Res. , 89:10311~10399.
[31]  Besse J, Courtillou V, Possi J P, Westphal M, et al. 1984.Paleomagnetic estimates of crustal shortening in the Himalayan thrusts and Zangbo suture. Nature, 311: 621~626.
[32]  Edwards M A, Harrison T M. 1997. When did the roof collapse? Late Miocene north-south extension in the High Himalaya revealed by the Th-Pb monazite dating of the Khula Kangri granite. Geology,25:543~546.
[33]  Harris N, Massey J. 1994. Decompression and anatexis of Himalayan metapelites. Tectonics, 13:1537~ 1546.
[34]  Jaeger J J, Courtillot V, Tapponnier P. 1989. Paleontological view of the ages of the Deccan traps, the Cretaceous/Tertiary boundary and the India-Asia collision. Geology,17: 316~319.
[35]  Jin Chengwei, Harris N B W, Xu Ronghua, et al. 1990. Plutonic rocks of the 1985 Tibet Geotraverse, Lhasa to Golmud. The geology evolution of the Tibetan Pleteau. Beijing: Science Press,141~172 (in Chinese with English abstract).
[36]  Kidd W S F, Pan Y, Chang C, et al. 1988. Geological mapping of the 1985 Chinese-British Tibetan ( Xizang-Qinghai ) Plateau geotraverse route. Phil. Trans. Roy. Soc, London A, 327:287~305.
[37]  Liegeois J P. 1998. Some words on the post-collisional magmatism.Lithos. , 45: 15~17.
[38]  Liu Qisheng, Wu Zhenhan, Hu Daogong, et al. 2003. SHRIMP UPb zircon dating of the Nyainqentanglha Granite. Chinese Science Bulletin,48 (20): 2170~2175 (in Chinese).
[39]  Nam T N, Sano Y, Terada K, et al. 2001. First SHRIMP U-Pb zircon dating of granulites from the Kontum massif (Vietnam)and tectonothermal implications. Journal of Asian Earth Sciences,19:77~84.
[40]  Searle M P, Parrish R R, Hodges K V A, et al. 1997. Shisha Pangma leucogranite, south Tibetan Himalaya: field relations,geochemistry, age, origin and emplacement. Journal of Geology,105:295~317.
[41]  Tugner D L, Forbes R B. 1976. K-Ar studies in two deep basement drill holes: a new geological estimate of blocking for biobite.Eos. ,57: 353.
[42]  Willems H, Zhou Z, Zhang B, et al. 1996. Stratigraphy of the Upper Cretaceous and Lower Tertiary strata in the Tethyan Himalayas of Tibet (Tingri area, China). Geol. Rundsch, 85: 723~754.
[43]  Wu C, Nelson K D, Wortman G, et al. 1998. Yadong cross structure and south Tibetan detachment in the east central Himalaya.Tectonics, 17(1) :28~45.
[44]  Xiao Xuchang, Li Tingdong. 2000. Tectonic Evolution and Uplift of Qinghai-Xizang (Tibet) Plateau. Guangzhou: Guangdong Science and Technology Press, 1~313 (in chinese).
[45]  Xu R H, Scharer U, Allegre C J. 1985. Magmatism and metamorphism in the Lhasa block (Tibet): a geochronological study. Journal of Geology, 93 : 41 ~ 57.
[46]  Yin A, Harrison T M. 2000. Geologic evolution of the HimalayanTibetan orogen. Annu. Rev. Earth Planet. Sci. Lett., 28: 211~280.

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