| 西藏邦铺钼(铜)矿床辉绿玢岩脉体LA-ICP-MS锆石U-Pb定年及其地质意义 |
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| 关键词:LA-ICP-MS zircon U-Pb dating allgovite Bangpu Gangdise Tibet |
| 基金项目:国家973项目(编号: 2011CB403103);青藏专项(编号: 1212011085529) |
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| LA-ICP-MS Zircon U-Pb Dating of Allgovite in the Bangpu Molybdenum (Copper) Deposit in Tibet and Its Geological Significance |
| The Bangpu porphyry Mo (Cu) deposit is located in the eastern part of the Gangdise metallogenic belt in Tibet, near the Jiama copper polymetallic deposit and the Qulong porphyry Cu deposit. The magma invasion is of high frequency in this area, and varied kinds of intrusions were developed in different periods. Researches on the allgovite in the northern part of the Bangpu ore district are very insufficient. The age of allgovite was obtained in this deposit. According to LA-ICP-MS analysis of the zircon U-Pb age precision of the allgovite, 19 zircons from allgovite yielded the weighted average 206Pb/238U age of 15.21±0.29 Ma (MSWD=9.6, N=19), suggesting Miocene magma emplacement in Gangdise belt, and the age is consistent with that of allgovite in the Jiama porphyry deposit. Regional ore-forming regularity study shows that the Bangpu porphyry Mo (Cu) polymetallic deposit is in accord with the regional porphyry deposits such as Jiama and Qulong in the ore-forming and rock-forming age, suggesting that this deposit has the same geochemical dynamic background deep process as Jiama, Qulong and some other ore deposits. |
| LENG Qiu-feng,WANG Li-qiang,YING Li-juan,ZHENG Wen-bao,LUO Mao-cheng,CHEN Wei,LIN Bin,WANG Yi-yun.2012.LA-ICP-MS Zircon U-Pb Dating of Allgovite in the Bangpu Molybdenum (Copper) Deposit in Tibet and Its Geological Significance[J].Acta Geoscientica Sinica,33(4):559-568. |
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