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地质论评  2004 

大别核部杂岩中斜长角闪岩的地球化学特征及其地质意义

Keywords: 大别核部杂岩斜长角闪岩岩石地球化学Sm―Nd同位素等时线年龄

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Abstract:

大别核部杂岩单元中斜长角闪岩的地球化学特征对于认识大别核部杂岩单元的特征及归属有着十分重要的意义。本文对大别核部杂岩单元中斜长角闪岩的岩石地球化学特征及Sm-Nd同位素特征进行了较系统研究。斜长角闪岩的Nd亏损地幔模式年龄(t_(DM))有3个不连续年龄段,它们分别为2.50~2.92Ga(平均2.71Ga);1.79~2.47Ga(平均2.14Ga);1.07~1.57Ga(平均1.38Ga)。模式年龄为中元古代、古元古代的斜长角闪岩的等时线年龄分别为1444±180Ma、2220±210Ma,其模式年龄与等时线年龄在误差范围内一致。表明至少模式年龄为元古宙的斜长角门岩的t_(DM)可代表其原岩的近似形成年龄,从而证明大别核部杂岩单元中存在着古元古代、中元古代两期自亏损地幔分异的基性火山岩变质形成的斜长角闪岩。而模式年龄为新太古代的斜长角闪岩,其模式年龄能否代表其形成年龄还需要进一步研究。各期斜长角闪岩在地球化学特征上的差异表现得不明显。通过对其原岩性质研究表明:原岩主要为拉斑玄武岩,少数为钙碱性玄武岩。大别核部杂岩中斜长角闪岩原岩ε_(Nd)(t)反映出大别核部杂岩地区上地幔自古元古代到中元古代一直沿着亏损地幔Nd同位素的演化线演化发展,这种性质及演化趋势与扬子北缘及南秦岭早期上地幔Nd同位素性质及演化趋势十分

References

[1]  凌文黎,高山,郑海飞,等.1998.扬子克拉通黄陵地区崆岭杂岩SmNd同位素地质年代学研究.科学通报,43(1):86~89.
[2]  张本仁,高山,张宏飞,等.2002.秦岭造山带地球化学.北京:科学出版社.49.
[3]  张宏飞,高山,张本仁,钟增球,贾望鲁,王林森.2001.大别山地壳结构的Pb同位素地球化学示踪.地球化学,30(4):395~401.
[4]  郑祥身,金成伟,翟明国,石永红.1999.北大别灰色片麻岩的岩石化学特征及大地构造背景.岩石学报,1 5(1):350~358.
[5]  郑祥身,金成伟,翟明国,石永红.2000.北大别灰色片麻岩原岩性质的探讨:Sm-Nd同位素年龄及同位素成分特点.岩石学报,16(2):194~198.
[6]  钟增球,索书田,张宏飞,周汉文.2001.桐柏-大别碰撞造山带的基本组成与结构.地球科学,26(6):560~567.
[7]  张宗清,张国伟,等.2002.南秦岭变质地层同位素年代学.北京:地质出版社.
[8]  Changqian Ma, Carl Ehlers, Changhai Xu, Zhichang Li, Kunguang Yang. 2000. The roots of the Dabieshan ultrahigh-pressure metamorphic terrane: constraints from geochemistry and Nd-Sr isotope systematics. Precabrian Research, 102: 279~ 301.
[9]  Chavagnac V, Jahn B M. 1996. Coesite-bearing eclogites from the Bixiling complex, Dabie Moutains, China, Sm-Nd ages,geochemical characteristics and tectonic implications. Chem.Geol. , 133:29~51.
[10]  Feng Xue, David B, Rowley Robert D Tucker, Zhan Peng. 1997. UPb ages of Granitoid Rocks in the North Dabie Complex Eastern Dabie Shan, China. The Journal of Geology, 105: 744 ~ 753.
[11]  Jahn B M, Auvray B, Shen Q H, Liu D Y, et al. 1988. Archean crustal evolution in China: the Taishan complex and evidence for juvenile crustal addition from long-term depleted mantle.Precamb. Res. , 38: 381~403.
[12]  Liou J G, Zhang R, Ernst W G. 1994. An introduction to ultrahighpressure metamorphism. the Island Arc. , 3:1~24.
[13]  Misra S N. 1971. Chemical distinction of high-grade ortho and parametabasites. Norsk Geologisk Tidsskrift, 51: 311~316.
[14]  Miyashiro A, Shido C. 1975. Tholeiitic and calc-alkadic series in relationto the behaviors of titanium, vanadium, chromium and nickel. American Journal of Science, 275: 265 ~ 277.
[15]  Qi L, Hu J, Gregoire D C. 2000. Determination of trace elements in granites by inductively coupled plasma mass spectrometry.Talanta, 51:507~513.
[16]  Cao Ronglong, Zhu Shouhua. 1995. The Dabieshan coesite-bearing eclogite terrain-a neoarchaean ultra-high pressure metamorphic belt. Acta Geologica Sinica, 69 (3): 232 ~ 242 (in Chinese with English abstract).
[17]  Liu Yican, Xu Shutong, Jiang Laili, Wu Weiping, Su Wen, et al.1998. Geochemical Characteristics and tectonic settings of amphibolites from the metamorphosed mafic-ultramafic belt in the northern part of the Dabie shan Orogen. Geotectonica et Metallogenia, 22 (4): 323 ~ 331 (in Chinese with English abstract).
[18]  Suo Shuotian, Zhou Hanwen, Zuo Wenchao. 1992. Transpressional deformation acrossthe Tongbai-Dabie Orogenic Belt. Hubei Geology, 6(1):11~22(in Chinese with English abstract).
[19]  Xie Zhi, Chen Jiangfeng, Zhang Xun, Gao Tianshan, Dai Shengqian,Zhou Taixi, Li Huimin. 2001. Zircon U-Pb dating of gneiss from Shizhuhe in North Dabie and its geologic implications. Acta Petrologica sinica, 17 (1): 139 ~ 144 (in Chinese with English abstract).
[20]  Zhang Benren, Gao Shan, Zhang Hongfei, et al. 2002. Geochemistry of Qinling orogen. Beijing: Science Press (in Chinese).
[21]  Zhang Hongfei, Gao Shan, Zhang Benren, Zhong Zengqiu, Jia Wanglu, Wang Linsen. 2001. Pb isotopic study on crustal structure of Dabie Mountains, central China. Geochinmica, 30(4): 395~401 (in Chinese with English abstract).
[22]  Zheng Xiangshen, Jin Chengwei, Zhai Mingguo, Shi Yonghong.2000. Approach to the source of the gray gneisses in North Dabie Terrain: Sm-Nd isochron age and isotope composition. Acta Petrologica Sinica, 16 (2) : 194 ~ 198 (in Chinese with English abstract).
[23]  Zheng Xiangshen, Jin Chengwei, Zhai Mingguo, Shi Yonghong.1999. Petrochemistry and tectonic background of the gray gneisses in north Dabie Terrane. Acta Petrologica Sinica, (15)3:350~358(in Chinese with English abstract).
[24]  Zhong Zengqiu, Suo Shutian, Zhang Hongfei, Zhou Hanwen. 2001.Major constituents and texture of the Tongbai-Dabie collisional orogenic belt. Earth Science-Journal of China University of Geosciences, 26 (6): 560 ~ 567 (in Chinese with English abstract).
[25]  Zhang Zongqing, Zhang Guowei, et al. 2002. Isotopic geochronology of metamorphicstratum in Southern Qinling. Beijing: Geological Press(in Chinese).
[26]  曹荣龙,朱寿华.1 995.大别山含柯石英榴辉岩区--新太古代超高压变质带.地质学报,69(3):232~242.
[27]  陈道公,李彬贤,夏群科,吴元保,陈吴,等.2001.大别超高压碰撞造山带岩石锆石U/Pb同位素框架年代学.矿物岩石地球化学通报,20(4):253~255.
[28]  陈能松,游振东,索书田,等.1996.大别山中性麻粒岩和变形花岗岩的锆石U-Pb年龄.科学通报,41:1009~1012.
[29]  刘贻灿,徐树桐,江来利,吴维平,苏文,等.1998.大别山北部斜长角闪岩类的地球化学特征及形成构造背景.大地构造与成矿学,22(4):323-331.
[30]  索书田,周汉文,左文超.1992.横过桐柏-大别造山带的转换压缩变形.湖北地质,6(1):11~22.
[31]  谢智,陈江峰,等.2001.大别造山带北部石竹河片麻岩的锆石U-Pb年龄及其地质意义.岩石学报,17(1):139~144.
[32]  Cong Bolin, et al. 1996. Ultrahigh-pressure metamorphic rocks in the Dabie Shan-Sulu Region of China. Beijing: Science Press. and London: Kluwer Academic Pubisher.
[33]  Chen Daogong, Li Binxian, Xia Qunke, Wu Yuanbao, Cheng Hao.2001. Zircon U/Pb frame geochronology of ultra-high pressure zone rocks for Dabie orogen. Bulletin of Mineralogy, Petrology and Geochemistry, (20) 4: 253 ~ 255 (in Chinese with English abstract).
[34]  Chen Nengsong, You Zhendong, Suo Shutian, et al. 1996. Zircon UPb dating of meta- granulite and metamorphose granite in Dabie Shan. Chinese Science Bulletin, 41: 1009~1012 (in Chinese).
[35]  Ling Wenli, Gao Shan, Zheng Haifei, et al. 1998. Sm-Nd isotopic geochronology of Kongling complex in Huangling region of Yangtze Craton. Chinese Science Bulletin, 43 (1): 86 ~ 89 (in Chinese).

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