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地球学报  2006 

松潘-甘孜地区三叠系碎屑沉积岩地球化学特征及其锆石年龄研究

DOI: 10.3975/cagsb.2006.04.01

Keywords: 碎屑沉积岩,松潘—甘孜地块,锆石U-Pb定年,物质来源

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Abstract:

松潘—甘孜地块地处中国西南部,是中国大陆构造中重要的基本构造单元,三叠系碎屑沉积岩广泛分布,本文对松潘—甘孜地块的三叠系碎屑沉积岩4个样品的稀土元素及锆石U_Pb地球化学特征进行了系统研究。4个样品的稀土元素分布型式特征非常接近,这表明松潘—甘孜地区的三叠系碎屑沉积岩具有相同的来源。明显的轻、重元素分馏和铕异常则表明碎屑岩源区地壳内有较的深熔作用。锆石Th/U比和阴极发光表明它们基本上来自岩浆岩物源区。SHRIMP结果显示206Pb/238U年龄集中在200~1000Ma和1600~2400Ma,其中1600~2400Ma的锆石年龄记录了扬子克拉通基底的形成事件;200~1000Ma的锆石年龄反映了青白口纪及东吴运动期间扬子克拉通强烈的岩浆活动。此外,中三叠世末期秦岭造山带全面隆升成山,也阻断了华北克拉通为该区提供碎屑沉积岩的可能,因此,松潘—甘孜地区的三叠系碎屑沉积岩来源于杨子克拉通。

References

[1]  Zhang Benren;Gao Shan;Zhang Hongfei,Geochemistry of Qinling Orogenic Belt,北京:科学出版社,2002.
[2]  Xu Zhiqin;Hou Liwei;Wang Zongxiu,Building Process of the Ganzi--songpan orogenic belt,北京:地质出版社,1992.
[3]  Taylor S R;McLeannan S,The continental crust:its composition and evolution,Geoscience Texts Blackwell Scientific Publictions,1985.
[4]  邹光富,甘孜-理塘板块缝合带研究的新进展,四川地质学报,1995(04).
[5]  朱维光;刘秉光;邓海琳.扬子地块西缘新元古代镁铁-超镁铁质岩研究进展[J].矿物岩石地球化学通报,2004(03)
[6]  张本仁;高山;张宏飞,秦岭造山带地球化学,北京:科学出版社,2002.
[7]  许志琴;侯立玮;王宗秀,中国松潘-甘孜造山带的造山过程,北京:地质出版社,1992.
[8]  万天丰,中国大地构造学纲要,北京:地质出版社,2004.
[9]  宋彪;张玉海;万渝生,锆石SHRIMP样品靶制作、年龄测定及有关现象讨论,地质论评,2002(zk).
[10]  Zou Guangfu,Advance of the research on the Garze-Litang plate junction,Acta Geologica Sichuan,1995(04).
[11]  Mei-Fu Zhou ;Dan-Ping Yan ;Allen K. Kennedy ;Yunqian Li ;Jun Ding,SHRIMP U-Pb zircon geochronological and geochemical evidence for Neoproterozoic arc-magmatism along the western margin of the Yangtze Block, South China,Earth and Planetary Science Letters?,2002, 196(1-2).
[12]  Shen Weizhou;Lu Huaipeng;Xu Shijin,Sm-Nd isotopic study on metasediments in the area of Danba,China,Scientia Geologica Sinica,1998(03).
[13]  Bruguier O;Lancelot J R;Malavieille J,U-Pb dating on single detrital zircon grains from the Triassic Songpan-Ganzi flysch(central China):Provenance and tectonic correlations,Earth and Planetary Science Letters? ,1997, 152(1-4).
[14]  梁定益;聂泽同;宋志敏,扬子西缘东吴伸展运动,地球科学-中国地质大学学报,1994(04).
[15]  Wan Tianfeng,An Outline in Tectonics of China,北京:地质出版社,2004.
[16]  沈渭洲;陆怀鹏;徐士进,丹巴地区变质沉积岩Sm-Nd同位素研究,地质科学,1998(03).
[17]  陆松年;杨春亮;蒋明媚,前寒武纪大陆地壳演化示踪,北京:地质出版社,1996.
[18]  陈岳龙;刘飞;张宏飞,松潘一甘孜碎屑沉积岩的地球化学与Sm-Nd同位素地球化学,中国地质,.
[19]  Zhu Weiguang;Liu Dingguang;Deng Hailin.Advance in the study of Neoproterozoic mafic-ultramafic rocks in the western margin of the Yangtze Craton[J].Bulletin of Mineralogy Petrology and Geochemistry,2004(03)
[20]  Song Biao;Zhang Yuhai;Wan Yusheng,Mount making and procedure of the SHRIMP dating,Geol Review,2002(zk).
[21]  Nie Shangyou;Yin An;Rowley D B,Exhumation of the Dabie Shan ultra-high-pressure rocks and accumulation of the Songpan-Ganzi flysch sequence,central China,GEOLOGY,1994(11).
[22]  Lu Songnian;Yang Chunliang;Jiang Mingmei,Tracing the Evolution of Precambrian Continental Crust,北京:地质出版社,1996.
[23]  Liang Dingyi;Nie Zetong;Song Zhimin,Extensional Dongwu movement in the western margin of Yangtze region,Earth Science-Journal of China University of Geosciences,1994(04).

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