| 吕梁地区2.2~2.1Ga岩浆事件及其构造意义 |
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| 引用本文： | 杜利林,杨崇辉,任留东,宋会侠,耿元生,万渝生.吕梁地区2.2~2.1Ga岩浆事件及其构造意义[J].岩石学报,2012,28(9):2751-2769. |
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| 作者姓名： | 杜利林 杨崇辉 任留东 宋会侠 耿元生 万渝生 |
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| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037
2. 中国地质科学院地质研究所,北京 100037;北京离子探针中心,北京 100037 |
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| 基金项目： | 本文受中国地质调查局地质调查项目(1212011120152、1212010211802); 中国地质科学院地质研究所基本科研业务费项目(J0907、J0721); 国家自然科学基金项目(41172171)和全国地层委员会项目(1212011120142、1212010511702-01)联合资助 |
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| 摘 要： | 吕梁地区古元古代岩浆作用非常强烈,其成因与构造环境对客观恢复华北克拉通早期地质演化具有重要意义。本文选择了杜家沟长石斑岩、吕梁群近周峪组中基性火山岩和恶虎滩片麻岩进行了较系统研究。2个杜家沟长石斑岩的SHRIMP锆石U-Pb年龄分别为2189±6Ma和2186±3Ma,恶虎滩闪长质片麻岩的SHRIMP锆石U-Pb年龄为2182±5Ma。杜家沟长石斑岩为A型花岗岩,具有造山后花岗岩特征;吕梁群近周峪组中基性火山岩具有岛弧火山岩的地球化学特征;恶虎滩片麻岩也具有岛弧岩浆岩特征。综合分析华北克拉通2.2～2.0Ga的岩浆岩构造性质认为,吕梁地区岩浆性质的复杂性可能与所处的构造位置有关。古元古代吕梁地区可能位于华北克拉通古陆块边缘,其2.2～2.1Ga的岩浆岩可能经历岛弧和裂谷两种体制的共同制约。
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| 关 键 词： | 2.2～2.1Ga岩浆岩 锆石U-Pb年龄 地球化学 构造环境 吕梁地区 |
| 收稿时间： | 1/8/2012 12:00:00 AM |
| 修稿时间： | 5/4/2012 12:00:00 AM |
The 2.2 ～ 2.1Ga magmatic event and its tectonic implication in the Lüliang Mountains, North China Craton |
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| DU LiLin,YANG ChongHui,REN LiuDong,SONG HuiXi,GENG YuanSheng and WAN YuSheng.The 2.2 ～ 2.1Ga magmatic event and its tectonic implication in the Lüliang Mountains, North China Craton[J].Acta Petrologica Sinica,2012,28(9):2751-2769. |
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| Authors: | DU LiLin YANG ChongHui REN LiuDong SONG HuiXi GENG YuanSheng and WAN YuSheng |
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| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Beijing SHRIMP Center, Beijing 100037, China |
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| Abstract: | Paleoproterozoic magmas are widely distributed in Lüliang Mountains, and the petrogenesis and tectonic setting of these magmas are significant for reshaping the geological evolution of the North China Craton. In this paper, we report Dujiagou feldspar porphyrite, intermediate basic volcanic rocks from the Jinzhouyu Formation of the Lüliang Group and Ehutan gneiss in Lüliang Mountains. SHRIMP U-Pb zircon dating of two Dujiagou feldspar porphyrite samples yield the ages of 2189±6Ma and 2186±3Ma, respectively, and one Ehutan dioritic gneiss sample gets a SHRIMP U-Pb zircon age of 2182±5Ma. Dujiagou feldspar porphyrites show the characteristics of A-type granite formed in a post orogenic setting. While, intermdiate basic volcanic rocks in the Jinzhouyu Formation and Ehutan gneisses have the characteristics of volcanic rocks formed in island arc setting. Considering the tectonic setting of 2.2~2.0Ga magmatic events in the North China Craton, the formation of the 2.2~2.1Ga magmatic rocks is probably related to its tectonic position during the Paleoproterozoic, with Lüliang Mountains being located at the margin of the North China Craton. The 2.2~2.1Ga magmatic rocks in the study area were formed in both island arc and rift regimes at about same time. |
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