Ar-40-(39) ar dating and geochemical characteristics of lamprophyres in the baimazhai nickel deposit, yunnan province.
文献类型：期刊论文
| 作者 | Guan, T; Huang, ZL; Xu, C; Zhang, ZL; Yan, ZF; Chen, M |
| 刊名 | Acta petrologica sinica
 |
| 出版日期 | 2006-04-01 |
| 卷号 | 22期号:4页码:873-883 |
| 关键词 | Lamprophyre (40) ar/(39) ar dating Geochemical characteristic Origin Baimazhai Yunnan |
| ISSN号 | 1000-0569 |
| 通讯作者 | Guan, t(guantao204010@163.com) |
| 英文摘要 | 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. |
| WOS关键词 | INDO-ASIAN COLLISION ; VOLCANIC-ROCKS ; ELEMENT GEOCHEMISTRY ; TRACE-ELEMENT ; TIBET ; MAGMATISM ; SR ; ND ; PLATEAU ; ISOTOPE |
| WOS研究方向 | Geology |
| WOS类目 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000238367700011 |
| 出版者 | SCIENCE CHINA PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2378520 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Guan, T |
| 作者单位 | 1.Chinese Acad Sci, Inst Geochem, Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China |
| 推荐引用方式 GB/T 7714 | Guan, T,Huang, ZL,Xu, C,et al. Ar-40-(39) ar dating and geochemical characteristics of lamprophyres in the baimazhai nickel deposit, yunnan province.[J]. Acta petrologica sinica,2006,22(4):873-883. |
| APA | Guan, T,Huang, ZL,Xu, C,Zhang, ZL,Yan, ZF,&Chen, M.(2006).Ar-40-(39) ar dating and geochemical characteristics of lamprophyres in the baimazhai nickel deposit, yunnan province..Acta petrologica sinica,22(4),873-883. |
| MLA | Guan, T,et al."Ar-40-(39) ar dating and geochemical characteristics of lamprophyres in the baimazhai nickel deposit, yunnan province.".Acta petrologica sinica 22.4(2006):873-883. |
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来源：中国科学院大学
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