张广才岭东侧英城子金矿区早古生代花岗岩锆石U-Pb年龄及地质意义
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国家自然科学基金项目(批准号:40472050,40772052)和黑龙江省地球物理勘察院项目(编号:3J106H424422)联合资助


Zircon LA-ICP MS U-Pb Dating of the early Paleozoic granite in the District of Yingchegnzi gold deposit in the east of Zhangguangcailing area and its geological significance
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    摘要:

    本文首次对佳木斯地块西缘、张广才岭东侧英城子金矿区出露的大面积黑云母碱长花岗岩,进行了锆石LA-ICP MS U-Pb年代学精细研究。实验共获得四组单颗粒锆石U-Pb谐和年龄,它们分别为612±4Ma、495.2±2.7Ma、476.8±5.5Ma和431±3Ma;其中612±4Ma具有指示晚元古代增生地壳过程形成的花岗岩锆石特征,495.2±2.7Ma的U-Pb年龄与区域内麻山群的变质作用时间相吻合,431±3Ma的年龄与早古生代晚期的区域变质作用时间吻合,而476.8±5.5Ma的锆石年龄则代表黑云母碱长花岗岩的真实结晶年龄。这项成果记录了该地区在中一新元古代时期曾发生过重要的地壳增生事件,增生后的地壳被打开形成大洋;至早古生代早期,两侧的地体发生拼贴,引起区域麻山群发生麻粒岩相的变质作用、形成花岗质片麻岩;在早古生代晚期,佳木斯地块西缘的陆间洋最终闭合,形成具有壳源特征同碰撞花岗岩,之后的韧性变形作用可能为金矿床的形成提供了有利条件。

    Abstract:

    There were a great deal of biotite alkali-feldspar granite in the Yingchengzi gold deposit which located the western of Jiamusi massif, eastern of Zhangguangcailing area. We chosen biotite alkali-feldspar granite from the deposit for single zircon LA-ICP MS U-Pb dating., subdivided in to foue groups ages,as ages of 612±4Ma,495.2±2.7Ma,476.8±5.5Ma and 431±3Ma by the zircon analysis with LA-ICP MS, the date of 612±4Ma indicated t some granites formed in the late Proterozoic during the process of crustal growth; the date of 495.2±2.7Ma was consistent with the metamorphism of mashan group, the age of 431±3Ma was consistent with the regional metamorphism in the late Paleozoic, the real crystallization age of the biotite alkali-feldspar granite was 476.8±5.5Ma. The result indicated this area had happen crustal growth during the mid-new Proterozoic, and the new crust was opened formed ocean. Until the early of earlypaleozoic, the terranes between the ocean were collided and aroused granulite facies metamorphism with mashan group in the area. In late Early Paleozoic, the ocean was closed and formed syn-collisional granite which has the crust source characteristics in the western of Jiamusi massif. The ductile deformation with the collision offered some advantages for the gold deposit.

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陈雷,孙景贵,陈行时,赵雨君,陈 冬,赵俊康.2009.张广才岭东侧英城子金矿区早古生代花岗岩锆石U-Pb年龄及地质意义[J].地质学报,83(9):1327-1334.
chen lei, sunjinggui, Chen Xingshi, Zhao Yujun, Chen Dong, Zhao Junkang.2009. Zircon LA-ICP MS U-Pb Dating of the early Paleozoic granite in the District of Yingchegnzi gold deposit in the east of Zhangguangcailing area and its geological significance[J]. Acta Geologica Sinica,83(9):1327-1334.

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  • 收稿日期:2009-03-24
  • 最后修改日期:2009-06-02
  • 录用日期:2009-07-02
  • 在线发布日期: 2009-11-05
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