新疆达拉布特蛇绿岩带玄武岩地球化学特征:古亚洲洋与特提斯洋的对比
Geochemical and Sr-Nd-Pb isotopic characteristics of the dalabute ophiolite, Xinjiang:Comparison between the paleo-Asian ocean and the Tethyan mantle domains
-
摘要: 发育在我国北部的古亚洲洋构造域和西南部的特提斯构造域是中国境内最重要的两个构造体系,有关这两个构造域的地幔地球化学特征是揭示它们的演化与交接关系的重要课题之一.本文选择发育在新疆西准噶尔地区达拉布特蛇绿岩带中阿克巴斯套和大棍的枕状玄武岩进行了系统的岩石学和地球化学与Sr-Nd-Pb同位素地球化学研究,结果表明,达拉布特蛇绿岩带中枕状玄武岩具有N-MORB和E-MORB特征,可能形成于大洋中脊环境.岩石的87Sr/86Sr为0.682112～0.706040之间;143Nd/144Nd为0.512713～0.512879,εNd(t)= 2.8～ 5.1,206Pb/204Pb、207Pb/204Pb和208Pb/204Pb的变化范围分别是18.341～20.085、15.541～15.651和38.292～40.534.将达拉布特玄武岩的微量元素特征比值、Nd-Pb同位素等与印度洋MORB和太平洋与北大西洋MORB,以及已知的特提斯和古亚洲洋地幔域进行对比表明,达拉布特蛇绿岩单元内MORB型玄武岩与特提斯构造域特蛇绿岩单元内MORB型玄武岩同位素特征一致,都显示了印度洋型的MORB特征.这意味着位于现今新疆西准噶尔地区的古亚洲洋地幔域没有显示出与特提斯不同的典型的太平洋和北大西洋的地球化学特征.
-
-
[1] Bai WJ, Yang JS, Zhou MF and Hu XF. 1995. Tectonic evolution of different dating ophiolites in the western Junggar, Xinjiang. Acta Petrologica Sinica, 11 (Supp) : 62 - 72 ( in Chinese with English abstract ).
[2] Bougauh H, Joron J and Treuil M. 1980. The primordial chondfitic nature and large-scale heterogeneities in the mantle: Evidence from high and low partition coefficient elements in oceanic basalts. London: Philo. Trans. R. Soe., Set. A297:203-213.
[3] Boynton WV. 1984. Geochemistry of the earth elements: Meteorite studies. In: Henderson P(ed. ). Rare earth element geochemistry. Elsevier, 63 - 114.
[4] Bureau of Geology and Mineral Resources of Xinjiang Uygur Autonomous Region. 1993. The Geology of Xinjiang Autonomous Region. Beijing: Geological Publishing House (in Chinese).
[5] Chauvel C, Hofmann AW and Vidal P. 1992. HIMU and EM: The French Polynesian connection. Earth Planet, 110:99 -109.
[6] Condie KC. 1989. Geochemical changes in basahs and andsites across the Archaean-Proterozoic boundary: Identification and significance. Lithos, 23 : 1 - 18.
[7] Feng Y. 1986. Genetic environments and original types of ophiolites in west Junggar. Northwest Geoscience, 13 : 37 - 43 ( in Chinese).
[8] Gao J, Tang YQ, Zhao M and Wang J. 1995. The formation envionment of ophiolites in Haerk Mountains, Xingjiang. Earth Science, 20 (6) : 682 -688 (in Chinese with English abstract).
[9] Gao J, Tang YQ, Zhao M and Wang J. 1995. The preliminary studies on tectonic environment of formation and geological and geochemical characters of ophiolites, south Tianshan Mountains, Xinjiang. Acta Petrologica Sinica, 11 ( Supp. ) : 85 - 97 ( in Chinese with English abstract ).
[10] Hart SR, Erlank AJ and Eable EJD. 1974. Sea floor basalts alternation: Some chemical and Sr isotopic effects. Contribution to Mineralogy and Petrology, 44 : 219 - 230.
[11] Hart SR. 1984. A large-scale isotope anomaly in the Southern Hemisphere mantle. Nature, 309:753-757.
[12] Hart SR. 1988. Heterogeneous mantle domains: Signatures, genesis and mixing chronologies. Earth Planet Sci. Lett. , 90:273 -296.
[13] Hawkins JW. 1980. Petrology of back-arc basins and island arcs. Parayion A ( ed. ). Ophiolites. Proceedings International Symposium. Cyprus, 244 -254.
[14] Hofmann AW. 1988. Chemical differentiation of the Earth: Relationship between mantle, continental crust and oceanic crust. Earth Planet Sci. Lett. , 90:297 -314.
[15] Huang JX, Zhao ZD, Zhang HF, Hou QY, Chen YL, Zhang BR and DePaolo DJ. 2006. Elemental and Sr-Nd-Pb isotopic geochemistry of the Wenduermiao and Bayanaobao-Jiaoqier ophiolites, Inner Mongolia: Constraints for the characteristics of the mantle domain of eastern Paleo-Asian Ocean. Acta Petrologica Sinica,22(12) :2889 - 2900 ( in Chinese with English Abstract).
[16] Rollison HR. 1993. Using geochemical data: Presentation, interpretation. Singpore: Longman Scientific and Technical Limited, 186 - 187.
[17] McCulloch MT, Gregory RT and Wasserburg GJ. 1981. Sm-Nd, Rb-Sr, and ^18O/^16 O isotopic systematics in an oceanic crustal section: Evidence from the Samail ophiolites. J. Geophys. Res. , 86:2721 - 2735.
[18] McDonough WF and Sun SS. 1995. The composition of the earth. Chem. Geol. , 120:223-253.
[19] Meschede M. 1986. A method of discrimination between different types of mid-ocean ridge basalts and continental tholeiites with the Nb-Zr-Y diagram. Chem. Geol. , 56:207 -218.
[20] Pearce JA and Cann JR. 1973. Tectonic setting of basic volcanic rocks determined using trace element analysis. Earth Planet Sci. Lett. , 19:290-300.
[21] Robinson PT, Zhou M, Hu X, Reynolds P, Bai W and Yang. 1999. Geochemical constraints on the origin of the Hegenshan ophiolite, Inner Mongolia, China. Journal of Asian Earth Sciences, 17:423 - 442.
[22] Rocci G, Ohnenstetter D and Ohnenstetter M. 1975. La dualite des ophiolites tethysinenes. Petrologie, 1 : 172 -174.
[23] Sun SS, Nesbitt RW and Sharaskin AY. 1979. Geochemical characteristics of mid-ocean ridge basahs. Earth Planet. Sci. Lett. , 44:119-138.
[24] Tian C, Can C and Yang F. 1989. Geochemical features of ophiolite in the fold belt on the north side of the Sino-Korean Platform. Acta Geoscientica Sinica, 19: 107 - 129 (in Chinese with English abstract ).
[25] Toshio N and Liu Y. 2002. Petrology of the Hegenshan ophiolite and its implication for the tectonic evolution of northern China. Earth Planet Sci. Lett. , 202:89 - 104.
[26] Wang Y, Zhang J and Wang L. 1982. Discussion on the basic geological features and genetic model of Darbut Ophiolite Zone, Xinjiang. Northwest Geoscience, 4:42 -56( in Chinese with English abstract).
[27] Weaver BL. 1991. The origin of ocean island basalt end-member compositions: Trace element and isotopic constraints. Earth Planet. Sci. Lett. , 104:381 -439.
[28] White WM. 1993. ^238 U/^204 Pb in MORB and open system evolution of the depleted mantle. Earth Planet. Sci. Lett. , 115:211 -226.
[29] Winchester JA and Floyd PA. 1977. Geochemical discrimination of different magma series and their differentiation products using immobile elements. Chemical Geology, 20 : 325 - 343.
[30] Wood DA. 1980. The application of a Th-Hf-Ta diagram to problems of tectonomagmatic classification and to establishing the nature of crustal contamination of basaltic lavas of the British Tertiary volcanic province. Earth Planet. Sci. Lett. , 50:11 - 30.
[31] Xiao X and Wang F. 1984. An introduction to the ophiolite of China. Acta Geosicientia Sinica, 9:19 - 30 (in Chinese with Englishabstract).
[32] Xiao X, Tang Y, Feng Y, Zhu B, Li J and Zhao M. 1992. Tectonics Evolution of the Northern Xinjiang and Its Adjacent Area. Beijing. Geological Publishing House (in Chinese).
[33] Xu JF and Castillo PR. 2002. MORB-type rocks from the Paleo Tethyan Mian-Lueyang northern ophiolite in the Qingling Mountains, central China: Implications for the source of the low^206pb/^204pb and high ^143Nd/^144 Nd mantle component in the Indian Ocean. Earth Planet. Sci. Lett. , 198:323 -337.
[34] Yang RY, Tang HF, Liu CQ, Gao Q, Zeng T and Wei L. 2000. Geochemistry of marie rocks from Dalabute ophiolite in western Junggar, Xinjiang, NW China. Acta Mineralogica Sinica, 20 ( 4 ) : 363 - 370.
[35] Zhang Q, Zhou GQ. 2002. Ophiolite in China. Beijing: Science Press (in Chinese with English abstract).
[36] Zhang Q. 1995. Some problems concerning the ophiolite study. Acta Petrologica Sinica, 11 (Supp.) : 228 -240 (in Chinese with English abstract ).
[37] Zhang SQ, Mahoney JJ, Mo XX, Ghazi Am, Milani L, Crawford AJ, Guo TY and Zhao ZD. 2005. Evidence for a widespread Tethyan upper mantal with Indian-ocean-type isotopic characteristics. Journal of Petrology, 46(4) : 829 -585.
[38] Zhao ZZ, Mo XX, Dong GC, Zhou S, Zhu DC, Liao ZL, Sun CG. 2007. Pb isotopic geochemistry of Tibetan plateau and its implications. Geoscience, 21 ( 2 ) : 265 - 274 ( in Chinese with English Abstract).
[39] Zhu BQ, Feng YM. 1994. Plate tectonics and evolution in west Junggar of Xinjiang. Xinjiang Geology, 12(2) : 91 - 105 ( in Chinese with English abstract).
[40] Zindler A, Hart S. 1986. Chemical geodynamics. Annu. Rev. Earth Planet. Sci. Lett. , 14:493 - 571.
[41] 侯青叶 赵志丹 张宏飞等.北祁连玉石沟蛇绿岩印度洋MORB型同位素组成特征及其地质意义[J].中国科学:D辑,2005,35(8):710-719.
[42] 肖序常 汤耀庆.新疆北部及其邻区大地构造[M].北京:地质出版社,1992.4-7.
[43] 张弛 翟明国.西准噶尔蛇绿岩带及其形成环境[A].涂光炽主编.新疆北部固体地球科学新进展[C].北京:科学出版社,1993.53-78.
-
计量
- 文章访问数: 10178
- PDF下载数: 12188
- 施引文献: 0
下载: