Partial melting time of the Sulu UHP terrane: Constraints from zircon U-Pb age, trace element and Lu-Hf isotope composition of leucosome in Rongcheng granitic gneiss
文献类型：期刊论文
| 作者 | Xu HaiJin1; Song YanRu2; Ye Kai3 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2013-05-01 |
| 卷号 | 29期号:5页码:1594-1606 |
| 关键词 | Partial melting Granitic gneiss Rongcheng Sulu UHP terrane |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | In order to decipher the partial melting time of the Sulu ultrahigh pressure (UHP) terrane during exhumation, we carried out a combined study of zircon internal structure, U-Pb age, trace element and Lu-Hf isotopic compositions coupled with fieldwork on leucosome of the Baocun grantic gneiss in Rongcheng region. Our works suggest that the leucosome, mainly composed of quartz, plagioclase, K-feldspar, and biotite, was the product of partial melting. Zircon from the leucosome display core-rim structure in cathodoluminescence (CL) images : inherited magmatic core and new growth magmatic rim. Most age data of the inherited cores are concordant with apparent Pb-206/U-238 ages ranging from 620 +/- 8Ma to 784 +/- 7Ma with a weighted mean age of 701 +/- 33Ma. The inherited cores have the characteristics of typical magmatic zircons, e. g., high HREE and Y contents, strong HREE enrichment on chondrite-normalized REE plot, very large positive Ce and negative Eu anomalies, and very low (Gd/Lu)(N) and Hf/Y ratios. The inherited cores have epsilon(Hf)(t =700Ma) values of -13. 0 to -8. 0 (mean = -10. 9 +/- 0. 8) and t(DM2) of 2120Ma to 2429Ma (mean =2303 +/- 51Ma). The new growth rims have concordant Pb-206/U-238 ages ranging from 211 +/- 6Ma to 244 +/- 5Ma with a weighted mean age of 226 +/- 10Ma. Although the new growth rims are greatly different from the inherited cores in trace element compositions, they still display features of the magmatic zircon, e. g., strong HREE enrichment on chondrite-normalized REE plot, large positive Ce and negative Eu anomalies, and very low (Gd/Lu)(N) and Hf/Y ratios. The new growth rims have epsilon(Hf)(t = 225Ma) values of -17. 3 to -14. 2 (mean = -15. 2 +/- 0. 6) and t(DM2) between 2152Ma and 2347Ma (mean = 2214 +/- 33Ma). These results suggest that protolith of the leucosome are Mid-Neoproterozoic (701 +/- 33Ma) magmatic rocks which were from Paleoproterozoic (2.2 similar to 2. 3Ga) continental crust The partial melting is expected under eclogite-facies to granulite-facies conditions during the early stage hot exhumation of the Rongcheng UHF felsic grieisses, and the partial melting time might be 226 10Ma. The K-feldspar- and quartz-rich pegmatitic veins (ca. 220 similar to 210Ma) in the Weihai-Rongcheng region might be from fractional crystallization of the partial melts during late stage cool exhumation under amphibolite facies conditions. |
| WOS关键词 | ULTRAHIGH-PRESSURE TERRANE ; WEIHAI MIGMATITIC GNEISSES ; COESITE-BEARING ZIRCON ; EASTERN CHINA ; METAMORPHIC ROCKS ; OROGENIC BELT ; FRACTIONAL CRYSTALLIZATION ; PROGRADE METAMORPHISM ; ICP-MS ; ECLOGITE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000321226200010 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/88086]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Xu HaiJin |
| 作者单位 | 1.China Univ Geosci, Fac Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 2.China Univ Geosci, Editorial Off Journal, Wuhan 430074, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu HaiJin,Song YanRu,Ye Kai. Partial melting time of the Sulu UHP terrane: Constraints from zircon U-Pb age, trace element and Lu-Hf isotope composition of leucosome in Rongcheng granitic gneiss[J]. ACTA PETROLOGICA SINICA,2013,29(5):1594-1606. |
| APA | Xu HaiJin,Song YanRu,&Ye Kai.(2013).Partial melting time of the Sulu UHP terrane: Constraints from zircon U-Pb age, trace element and Lu-Hf isotope composition of leucosome in Rongcheng granitic gneiss.ACTA PETROLOGICA SINICA,29(5),1594-1606. |
| MLA | Xu HaiJin,et al."Partial melting time of the Sulu UHP terrane: Constraints from zircon U-Pb age, trace element and Lu-Hf isotope composition of leucosome in Rongcheng granitic gneiss".ACTA PETROLOGICA SINICA 29.5(2013):1594-1606. |
入库方式： OAI收割
来源：地质与地球物理研究所
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