| 阿尔泰造山带阿巴宫花岗岩体锆石SHRIMP年龄及其地质意义 |
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| 关键词:Altaid Abagong gneissic granite zircon SHRIMP U-Pb dating |
| 基金项目: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:K0811); 国家自然科学基金项目(编号:40672065); “十一五”国家科技支撑计划重点项目(编号:2006BAB07B02-01、05); 国土资源大调查项目(编号:1212010561506) |
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| SHRIMP U-Pb Ages of the Abagong Granites in the Altay Orogen and Their Geological Implications |
| Numerous granitic plutons occur in China's Altay orogen.The authors made zircon SHRIMP U-Pb dating of two gneissic granites in Abagong area,which yielded ages of(462.5±3.6)Ma and(457.8±3.1)Ma respectively.These two ages are consistent with each other within the error limits,suggesting that the two plutons were produced by synchronous magmatism and probably formed a complete pluton in the deep crust.The age of the Abagong pluton indicates that the opinion held by previous researchers that Abagong granite is only a middle-late Variscan pluton seems not correct.The batholithic granite probably consists of plutons formed in different ages.The No.2 Abagong pluton occurs as a small stock that crops out within the volcanic strata of Lower Devonian Kangbutiebao Formation.The nonexistence of intrusive or faulting contact between this pluton and the strata implies that the volcanic strata might be the unconformable cover of the pluton.The pluton crops out locally due to the subsequent denudation and tectonic process. |
| LIU Feng,LI Yan-he,MAO Jing-wen,YANG Fu-quan,CAI Feng-mei,DI Xin-xia,YANG Zong-xi.2008.SHRIMP U-Pb Ages of the Abagong Granites in the Altay Orogen and Their Geological Implications[J].Acta Geoscientica Sinica,29(6):795-804. |
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