Petrogenesis of the lianyunshan granites in northeastern hunan province, south china, and its geodynamic implications.
文献类型：期刊论文
| 作者 | Xu DeRu1; Wang Li1,2; Li PengChun1,2; Chen GuangHao1; He ZhuanLi1,2; Fu GongGu1,2; Wu Jun1,2 |
| 刊名 | Acta petrologica sinica
 |
| 出版日期 | 2009-05-01 |
| 卷号 | 25期号:5页码:1056-1078 |
| 关键词 | Strongly peraluminous granite Afc processes Geodynamic background Lianyunshan region in northeastern hunan province Jiangnan oldland |
| ISSN号 | 1000-0569 |
| 通讯作者 | Xu deru(xuderu@gig.ac.cn) |
| 英文摘要 | The jiangnan oldland, an important region in south china, is characterized by multistage granitic magmatisms and large-scale gold and gold-polymetallic mineralization. the lianyunshan late mesozoic granites, which are sited in central section of the oldland, contain not only high contents of sio(2) (69.41% similar to 75.14%) and al(2)o(3) (13.61% similar to 17.46%), but also relatively low mafic contents (0.92% similar to 3.14%) and broad ranges of na(2)o from 2.04% to 3.83%, k(2)o from 1.94% to 4.94%, and cao from 0.82% to 3.24%, etc. these rocks, which mainly present strongly lree-enriched ree patterns, also show low concentrations of y (5.2 x 10(-6) similar to 18.0 x 10(-6)) and yb (mostly between 0.29 x 10(-6) and 0.70 x 10(-6)) but high ratios of sr/y (largely between 55 and 82) and (la/yb)(n) (mostly between 31 and 111). in concert with their relatively high sr ((87)sr/(86)sr(i) = 0.71008 similar to 0.73852), low nd (epsilon(nd)(t) = -9.95 similar to -12.37) and radioactive pb ((206)pb/(204)pb(i) = 17.972 similar to 19.959), as well as their geological and petrographic data, the lianyushan granites can be ascribed to strongly permaluminous type with geochemical affinities to typical adakitic rocks. we infer that the source rocks for our studied granites mainly are composed of metagreywackes, felsic gneisses and meta-tonalites, and that the parental magma to the granites which resulted from partial melting of over-thickened lower continental crust due to basaltic underplating had undergone assimilation and fractional crystallization. considering the regionally tectonic development of south china, we further postulate that the lianyunshan granites are majorly from partial melting of the paleoproterozoic "lianyunshan group (?)" due to a common result of over-thickened crust by the triassic collision of the yangtze with the north china blocks, and the subsequent extension and lithospheric thinning of the south china continent owing to subduction of the pacific plate under the south china. detailed study on the petrogenesis and geodynamic background of the lianyunshan granites is useful to open out the geodynamic mechanism for au and au-polymetallic mineralization in northeastern hunan province, china. |
| WOS关键词 | LACHLAN FOLD BELT ; TRACE-ELEMENT ; SOUTHEASTERN CHINA ; YANGTZE BLOCK ; ISOTOPIC SR ; TECTONIC IMPLICATIONS ; JIANGXI PROVINCE ; IGNEOUS ROCKS ; ND ; CONSTRAINTS |
| WOS研究方向 | Geology |
| WOS类目 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000266684900003 |
| 出版者 | SCIENCE PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2396964 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Xu DeRu |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, Res Ctr Petr Nat Gas & Mineral Resources, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu DeRu,Wang Li,Li PengChun,et al. Petrogenesis of the lianyunshan granites in northeastern hunan province, south china, and its geodynamic implications.[J]. Acta petrologica sinica,2009,25(5):1056-1078. |
| APA | Xu DeRu.,Wang Li.,Li PengChun.,Chen GuangHao.,He ZhuanLi.,...&Wu Jun.(2009).Petrogenesis of the lianyunshan granites in northeastern hunan province, south china, and its geodynamic implications..Acta petrologica sinica,25(5),1056-1078. |
| MLA | Xu DeRu,et al."Petrogenesis of the lianyunshan granites in northeastern hunan province, south china, and its geodynamic implications.".Acta petrologica sinica 25.5(2009):1056-1078. |
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来源：中国科学院大学
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