| 山东东部晚中生代构造岩浆活动及原型盆地恢复 |
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| 引用本文： | 周瑶琪,张振凯,梁文栋,李素,岳会雯.山东东部晚中生代构造岩浆活动及原型盆地恢复[J].地学前缘,2015,22(1):137-156. |
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| 作者姓名： | 周瑶琪 张振凯 梁文栋 李素 岳会雯 |
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| 作者单位： | 中国石油大学(华东) 地球科学与技术学院, 山东 青岛 266580 |
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| 基金项目： | 国家自然科学基金项目(41272123) |
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| 摘 要： | 山东东部近海地区花岗岩及变质岩中出露一套由陆源碎屑岩、火山碎屑岩和火山熔岩组成的沉积地层，其形成时代、地层属性及沉积背景争议较大。文中选取了青岛崂山垭口、灵山岛、唐岛湾，五莲大尚庄，诸城山东头村等剖面进行了详细的地层沉积特征描述，并对灵山岛老虎嘴处流纹岩及崂山垭口凝灰质铝土岩进行LA ICP MS测年，获得锆石U Pb年龄分别为(119.2±2.2)和(118.9±3.3) Ma，恰好对应胶莱盆地青山群火山活动初始阶段。根据沉积构造特征推断，山东近海晚中生代存在一个规模较大的NE向展布的裂陷盆地，呈凹隆相间的构造格局。系统总结了山东东部地区晚中生代构造岩浆活动及区域构造应力场的演化，发现裂陷盆地与胶莱盆地具有很好的对比性，莱阳期两盆地相连通，青山期由沿五莲青岛、牟即断裂带分布的火山弧将两个盆地分割，并对近海裂陷盆地晚中生代原型盆地进行恢复。
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| 关 键 词： | 晚中生代 构造岩浆活动 裂陷盆地 原型盆地恢复 |
| 收稿时间： | 2014-08-06 |
Late Mesozoic tectono-magmatic activities and prototype basin restoration in Eastern Shandong Province,China |
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| ZHOU Yaoqi
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ZHANG Zhenkai
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LIANG Wendong
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LI Su
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YUE Huiwen.Late Mesozoic tectono-magmatic activities and prototype basin restoration in Eastern Shandong Province,China[J].Earth Science Frontiers,2015,22(1):137-156. |
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| Authors: | ZHOU Yaoqi ZHANG Zhenkai LIANG Wendong LI Su YUE Huiwen |
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| Institution: | ZHOU Yaoqi;ZHANG Zhenkai;LIANG Wendong;LI Su;YUE Huiwen;School of Geosciences,China University of Petroleum; |
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| Abstract: | A set of sedimentary strata represented by terrigenous clastic rocks, volcaniclastic rocks and volcanic lava are developed among the metamorphic rocks and Yanshan granites in Eastern Shandong, which leave fierce debates on their ages, sedimentary characteristics and significance of the regional tectonics. This paper presents the characteristics of the strata around the outcrops of Lingshandao, Tangdaowan, Dashangzhuang in Wulian, Shandongtou in Zhucheng, Yakou in Mountain Laoshan. Samples from the Yakou of Laoshan Mountain and Laohuizui of Lingshan Island were dated using zircon LA ICP MS method, yielding two weighted mean 206Pb/238U ages of 118.9±3.3 Ma and 119.2±2.2 Ma which are coincident with the beginning of the volcanism of the Qingshan stage in the Jiaolai Basin. There was a large scale rift basin extending in NE direction developed in the offshore areas of Eastern Shandong Province during the Late Mesozoic, inferred by the sedimentary structures. This basin is characterized by alternating uplifts and depressions. Late Mesozoic tectono magmatic activities and the evolution of regional tectonic stress field were systematically summarized, and it shows a fine comparability between the rift basin and Jiaolai Basin. These two basins may be a whole in the Laiyang stage and were separated by the volcanic arc exposing along the Wulian Qingdao fault zone and Mouji fault zone in the Qingshan stage. Finally, this offshore prototype basin of the Late Mesozoic was restored based on the above analysis. |
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| Keywords: | Late Mesozoic tectono-magmatic activities rift basin prototype basin |
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