| 辽东半岛南部早前寒武纪花岗质岩浆作用的年代学格架 |
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| 引用本文： | 路孝平,吴福元,林景仟,孙德有,张艳斌,郭春丽.辽东半岛南部早前寒武纪花岗质岩浆作用的年代学格架[J].地质科学,2004,39(1):123-138. |
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| 作者姓名： | 路孝平 吴福元 林景仟 孙德有 张艳斌 郭春丽 |
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| 作者单位： | 1. 吉林大学地球科学学院, 长春, 130061;2. 中国科学院地质与地球物理研究所, 北京, 100029 |
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| 基金项目： | 国家自然科学基金，中国地质调查局地质调查项目，教育部重点实验室基金，中国科学院"百人计划" |
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| 摘 要： | 激光ICP-MS锆石年龄测定结果显示,出露于辽东半岛南部金州地区的太古宙花岗岩形成年龄为2440～2500Ma左右,比辽宁北部—吉林南部大致同时的太古宙花岗岩形成略晚,或基本相当。结合其它地质证据,上述两者在太古宙可能是相互独立的两个块体(分别称辽南地块和辽北—吉南地块),它们在古元古代晚期因造山作用而拼合在一起。古元古代花岗岩形成于两个时期,早期形成的条痕状花岗岩侵位年龄为2160Ma,为辽河群沉积的基底岩石;晚期形成的斑状二长花岗岩和角闪辉石正长岩形成于距今约1850Ma,标志着辽吉古元古代造山作用的结束。据此,可确定辽河群沉积—变质的时限为距今2160～1850Ma,其演化时间不超过300Ma。
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| 关 键 词： | 花岗岩 年代学 早前寒武纪 辽东半岛 华北地台 |
| 文章编号： | 0563-5020(2004)01-0123-16 |
| 收稿时间： | 2003-05-22 |
| 修稿时间： | 2003年5月22日 |
GEOCHRONOLOGICAL SUCCESSIONS OF THE EARLY PRECAMBRIAN GRANITIC MAGMATISM IN SOUTHERN LIAODONG PENINSULA AND ITS CONSTRAINTS ON TECTONIC EVOLUTION OF THE NORTH CHINA CRATON |
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| Lu Xiaoping,Wu Fuyuan,Lin Jingqian,Sun Deyou,Zhang Yanbin,Guo Chunli.GEOCHRONOLOGICAL SUCCESSIONS OF THE EARLY PRECAMBRIAN GRANITIC MAGMATISM IN SOUTHERN LIAODONG PENINSULA AND ITS CONSTRAINTS ON TECTONIC EVOLUTION OF THE NORTH CHINA CRATON[J].Chinese Journal of Geology,2004,39(1):123-138. |
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| Authors: | Lu Xiaoping Wu Fuyuan Lin Jingqian Sun Deyou Zhang Yanbin Guo Chunli |
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| Institution: | 1. College of Earth Sciences, Jilin University, Changchun 130061;2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | Zircon laser ablation (LA)-ICP-MS analyses indicated that the Archean granites exposed in Jinzhou,southern part of the Liaodong Peninsula,were emplaced 2440～2500 Ma ago,which was temporally comparable to the coeval Archean granites in the Liaobei (Northern Liaoning)-Jinan (southern Jilin) Block.Combined with the related geological evidences,Jinzhou (the Southern Liaoning) and the Liaobei-Jinan would be two individual blocks in Archean time,the both collided together in the Late Paleo-Proterozoic.However,the Paleo-Proterozoic granites were formed in two separated stages.The earlier streak-like granites were emplaced about 2160 Ma ago,and served as the basement of the Paleo-Proterozoic Liaohe Group; the later porphyritic granite and hornblende syenite formed about 1850 Ma ago,which indicated the termination of the Liaoji Paleo Proterozoic orogenesis.Based on what mentioned-above,it could be concluded that the deposition metamorphism of the Liaohe Group occurred 2 160 Ma to 1850 Ma ago,with duration no longer than 300 Ma. |
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| Keywords: | Granitoids Geochronology Early Precambrian The Liaodong Peninsula The North China Craton |
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