| 三江盆地绥滨断陷基底花岗岩的锆石U-Pb年代学及其构造意义 |
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| 引用本文： | 高福红,王枫,曹花花,郑宇航,刘军.三江盆地绥滨断陷基底花岗岩的锆石U-Pb年代学及其构造意义[J].吉林大学学报(地球科学版),2010,40(4):955-960. |
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| 作者姓名： | 高福红 王枫 曹花花 郑宇航 刘军 |
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| 作者单位： | 1.吉林大学 地球科学学院,长春 130061;
2.河南洛阳栾川钼业集团,河南 洛阳 471500 |
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| 摘 要： | 根据三江盆地绥滨断陷滨参1井基底花岗岩锆石LA-ICP-MS U-Pb定年结果，探讨了盆地基底的性质。滨参1井基底花岗岩中的锆石呈自形-半自形晶，并具有典型的岩浆生长环带;锆石的Th/U值为0.22~0.82，表明其岩浆成因。花岗岩中锆石22个测点的206Pb/238U年龄值为427~502 Ma，其加权平均年龄分为2组，分别为（430±8） Ma和（496±6） Ma。（430±8） Ma的年龄代表了三江盆地绥滨断陷基底花岗岩的形成时代为早志留世晚期；而（496±6） Ma可能是花岗岩浆形成或侵位过程中的捕获锆石年龄，并且它与佳木斯地块麻山群和泛非期片麻状花岗岩的形成时间一致。上述结果表明：三江盆地绥滨断陷基底中存在加里东期花岗岩，三江盆地西部基底与佳木斯地块的属性相同。
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| 关 键 词： | 三江盆地 绥滨断陷 基底 花岗岩 LA-ICP-MS 锆石U-Pb定年 佳木斯地块 |
| 收稿时间： | 2009-10-14 |
Zircon U-Pb Age of the Basement Granite from Suibin Depression in Sanjiang Basin and Its Tectonic Implications |
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| GAO Fu-hong,WANG Feng,CAO Hua-hua,ZHENG Yu-hang,LIU Jun.Zircon U-Pb Age of the Basement Granite from Suibin Depression in Sanjiang Basin and Its Tectonic Implications[J].Journal of Jilin Unviersity:Earth Science Edition,2010,40(4):955-960. |
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| Authors: | GAO Fu-hong WANG Feng CAO Hua-hua ZHENG Yu-hang LIU Jun |
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| Institution: | 1.College of Earth Sciences, Jilin University, Changchun 130061, China;
2.Luoyang Luanchuan Molybdenum Co, Ltd, Luoyang, Henan 471500, China |
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| Abstract: | Based on the LA-ICP-MS zircon dating of the basement granite from the well Bincan 1, the characters of the basement in the Sanjiang basin are discussed. Zircons from the granite of the well Bincan 1 are euhedral to subhedral in shape and show the typical oscillatory zoning, which indicates their magmatic origin. Their Th/U ratios ranging from 0.22 to 0.82 imply that they derived from crystallization of magma.206Pb/238U ages of zircons from the granite are between 427 Ma and 502 Ma, weighted mean 206Pb/238U ages are subdivided into two groups, i.e., (430±8) Ma and (496±6) Ma, respectively. The age of (430±8) Ma represents the formation time of the basement granite beneath the Suibin depression, i.e., the Early Silurian, whereas the age of (496±6) Ma represents the timing of captured zircons during the formation of granitic magma and/or magmatic emplacement. These captured zircons are temporally consistent with the Mashan Group and the Pan African gneissic granites within the Jiamusi massif. It’s concluded that the there occur Calidonian granites within the basin basement. Moreover, the basement beneath the Suibin depression within the Sanjiang basin has the same geological features as the Jiamusi massif. |
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| Keywords: | LA-ICP-MS |
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