| 新疆白干湖钨锡矿田东北部花岗岩锆石SIMS U-Pb 年龄、地球化学特征及构造意义 |
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| 关键词:A-type granite SIMS zircon U-Pb age petrochemistry Baigan Lake in XinJiang Qimantag Eastern Kunlun orogenic belt |
| 基金项目:国家自然科学基金项目(编号: 41172076)；中国博士后科学基金项目(编号: 20090460132)；中国地质调查局地质调查项目(编号: 1212011085528)；国土资源部“百人计划”项目和中央级公益性科研院所基本科研业务费专项资金项目(编号: K0901) |
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| SIMS Zircon U-Pb Age, Petrochemistry and Tectonic Implications of Granitoids in Northeastern Baiganhue W-Sn Orefield, Xinjiang |
| Moyite and adamellite emplaced in northeastern Baiganhue W-Sn orefield have similar rock-forming ages and geochemical characteristics, suggesting a complex rock body of comagmatic evolution. Zircon U-Pb ages obtained by SIMS technique are (422±3) Ma and (421±3.7) Ma respectively, indicating mid-late Silurian. Their petrochemistry is characterized by weakly peraluminous or quasi-aluminous nature (A/NKC≈1), high K, (K2O/Na2O ratios are 1.08-1.31 and 1.03-1.22), high alkali((Na2O+K2O)are 8.59%~9.38% and 9.54%~9.69%), calc-alkaline or weak alkaline (δ values are 2.39-3.17 and 4.02-4.22), high Fe# (TFeO/MgO are 9.58~12.26 and 8.94~9.96), flattened higher total REE (228×10-6~448×10-6 and 271×10-6~392×10-6 respectively), depletion of Ba, Nb, Sr, T and P, and enrichment of La, Ce, Zr and Sm, implying that the composite body should be A-type granite. In R1-R2 multi-cation diagram for tectonic environments discrimination, they fall in post-orogenic stage region, and Sr-Yb diagrams give low Sr-high Yb characteristics, indicating a stretching thinning environment of the crust. Pearce discrimination diagrams of tectonic environments show that the granitoids were formed in an intraphate setting. An integrated analysis of the regional background data has led the authors to believe that these two granitoids were formed at the post-orogenic stage of Caledonian orogeny cycle. |
| LI Guo-chen,FENG Cheng-you,WANG Rui-jiang,MA Sheng-chao,LI Hong-mao,ZHOU An-shun.2012.SIMS Zircon U-Pb Age, Petrochemistry and Tectonic Implications of Granitoids in Northeastern Baiganhue W-Sn Orefield, Xinjiang[J].Acta Geoscientica Sinica,33(2):216-226. |
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