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管涛, 黄智龙, 许成, 等. 2006. 云南白马寨镍矿区煌斑岩40Ar-39Ar定年和地球化学特征. 岩石学报, 22: 873-883. 不知这篇文章是不是SCI检索的，请好心人帮忙查一下检索结果，金币致谢。 |
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显示 1 条，共 1 条 作者: Guan, T; Huang, ZL; Xu, C; Zhang, ZL; Yan, ZF; Chen, M 标题: Ar-40-(39) Ar dating and geochemical characteristics of lamprophyres in the Baimazhai nickel deposit, Yunnan province. 来源出版物: ACTA PETROLOGICA SINICA, 22 (4): 873-883 APR 2006 作者关键词: lamprophyre; (40) Ar/(39) Ar dating; geochemical characteristic; origin; Baimazhai; Yunnan KeyWords Plus: INDO-ASIAN COLLISION; VOLCANIC-ROCKS; ELEMENT GEOCHEMISTRY; TRACE-ELEMENT; TIBET; MAGMATISM; SR; ND; PLATEAU; ISOTOPE 摘要: Lamprophyres in the Baimazhai nickel deposit are classified as minettes. The dating results of two samples are 32.46 +/- 0.62Ma and 32.01 +/- 0.60Ma, respectively, which indicate they are products of early pulse of Cenozoic potassic magmatism in the Ailaoshan fault belt. As to chemical composition, the lamprophyres have high M value [100 Mg/(Mg + Fe2+)] (67.42 similar to 86. 35), with enriched ALK ( the content of K2O + Na2O range from 7.01% to 9.81%), potassium ( the ratios of K2O/Na2O range from 1.66 to 2.64), large ion lithophile elements ( e. g. Sr, Rb, Ba, etc) and LREE, and show marked negative Ta-Nb-Ti anomalies. The Sr-Nd isotopic data pose the characteristics of high (Sr-86/Sr-86), (0.70625 similar to 0.70912) and low epsilon(Nd) (-5.22 similar to -3.68), and lie between EM1 and EM2 end members, especially near EM2. All these characteristics show that the lamprophyres were derived from a metasomatized enriched mantle source region. Further identification show the source rock lie between spinel harzburgite and garnet lherzolite and is dominated by the former, and metasomatized enriched minerals in the source region include phlogopite and amphibole. The magma predominantly evolved through fractional crystallization of olivine + plagioelase +/- apatite +/- Ti-Fe oxides. The lamprophyres formed in continental arc tectonic setting. Both subducted continental and ancient Tethyan oceanic crust contributed to enriched mantle source region. The lamprophyres coincide with other early pulse of Cenozoic potassic magmatic rocks in the Ailaoshan fault belt in age and geochemical characteristics, which indicate they were derived from similar mantle source region and formed in the same tectonic setting. 地址: Chinese Acad Sci, Inst Geochem, Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China; Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 通讯作者地址: Guan, T, Chinese Acad Sci, Inst Geochem, Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China. 电子邮箱地址: guantao204010@163.com 引用的参考文献数: 40 被引频次: 1 出版商: SCIENCE CHINA PRESS 出版商地址: 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA ISSN: 1000-0569 29 字符的来源出版物名称缩写: ACTA PETR SIN ISO 来源文献出版物名称缩写: Acta Petrol. Sin. 来源文献页码计数: 11 ISI 文献传递号: 054HP |
2楼2010-10-19 20:33:54