| Element and sr-nb-pb isotope geochemistry of ganite-porphyry dykes in the yangshan gold belt, western qinling orogen | |
| Liu HongJie1,2; Chen YanJing1,3,4; Mao ShiDong2,3; Zhao ChengHai1,2; Yang RongSheng4 | |
| 刊名 | Acta petrologica sinica
 |
| 2008-05-01 | |
| 卷号 | 24期号:5页码:1101-1111 |
| 关键词 | Granite porphyry Element geochemistry Sr-nd-pb isotopes Yangshan gold belt Qinling collisional orogen |
| ISSN号 | 1000-0569 |
| 通讯作者 | Liu hongjie(liuhongjie@mails.gyig.ac.cn) |
| 英文摘要 | The garnet-bearing granite-porphyry dykes in the yangshan gold belt, gansu province, are peraluminum granitoids with a/cnk ratios ranging 1. 65 similar to 3. 65. the granite-porphyries are rich in lile and lree, and depleted in ba, sr, nb, ta, p and ti, showing similar trace element pattern to typical syn-collision granites. with sigma ree = 54. 35 similar to 124. 01 x 10(-6), (la/yb)(n) = 9. 72 similar to 27. 80, and delta eu = 0. 70 similar to 0. 89, the granitic magmas were originated from partial-melting with little of plagioclase as residual phase. the porphyries have i(sr) ratios of 0. 70806 similar to 0. 71756 with average of 0. 71107, epsilon(nd) ( t) values of - 2. 9 similar to - 5. 0 with average of - 3. 4, and nd-model ages (t(2dm)) of 1. 24 similar to 1. 41 ga with average of 1. 34 ga, which suggests that the magmas must be sourced from lowly-matured mesoproterozoic basement. the averages of, ((206) pb/(204) pb) (220ma), ((207)pb/(204)pb)(220ma) and ((208)pb/(204) pb) (220ma) ratios are 17. 875, 15. 604 and 38. 296, respectively, similar to those of both the bikou group of the bikou terrane and the mesoproterozoic basement of the qinling micro-continent. considering that the bikou group has been dated to have developed during 1. 235 - 1. 367 ga in previous studies, and that the qinling micro-continent, which hosts the yangshan gold belt at its southern margin, southwardly overthrusted onto the bikou terrane along the mian-lue suture, we suggest that the interested granite-porphyrics were generated by metamorphic devolatilization-related partial melting of the underthrust slab mainly consisting of the bikou group. hence the granite-porphyries in the yangshan gold belt are typical syn-collision granitoids formed during the mesozoic collision between the yangtze and north china continents. |
| WOS关键词 | CONTINENTAL-CRUST ; GRANITIC-ROCKS ; CENTRAL CHINA ; DEPOSIT ; MODEL ; ND ; CONSTRAINTS ; MECHANISM ; EVOLUTION ; PROVINCE |
| WOS研究方向 | Geology |
| WOS类目 | Geology |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:000259628700016 |
| 内容类型 | 期刊论文 |
| URI标识 | http://www.corc.org.cn/handle/1471x/2385566 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Liu HongJie |
| 作者单位 | 1.Chinese Acad Sci, State Key Lab Ore Deposit Geochem, Inst Geochem, Guiyang 550002, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Key Lab Mineralizat Dynam, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 4.Peking Univ, Key Lab Orogen & Crust Evolut, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu HongJie,Chen YanJing,Mao ShiDong,et al. Element and sr-nb-pb isotope geochemistry of ganite-porphyry dykes in the yangshan gold belt, western qinling orogen[J]. Acta petrologica sinica,2008,24(5):1101-1111. |
| APA | Liu HongJie,Chen YanJing,Mao ShiDong,Zhao ChengHai,&Yang RongSheng.(2008).Element and sr-nb-pb isotope geochemistry of ganite-porphyry dykes in the yangshan gold belt, western qinling orogen.Acta petrologica sinica,24(5),1101-1111. |
| MLA | Liu HongJie,et al."Element and sr-nb-pb isotope geochemistry of ganite-porphyry dykes in the yangshan gold belt, western qinling orogen".Acta petrologica sinica 24.5(2008):1101-1111. |
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