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| 华北克拉通鲁西地区早前寒武纪表壳岩系重新划分和BIF形成时代 | |
| 引用本文： | 万渝生,刘敦一,王世进,焦秀美,王伟,董春艳,颉颃强,马铭株.华北克拉通鲁西地区早前寒武纪表壳岩系重新划分和BIF形成时代[J].岩石学报,2012,28(11):3457-3475. |
| 作者姓名： | 万渝生 刘敦一 王世进 焦秀美 王伟 董春艳 颉颃强 马铭株 |
| 作者单位： | 1. 中国地质科学院地质研究所北京离子探针中心,北京,100037 2. 山东省地质调查院,济南,250013 3. 山东省地矿局,济南,250013 4. 中国科学院地质与地球物理研究所,北京,100029 |
| 基金项目： | 本文受国家973项目(2012CB416601);国家自然科学基金项目(41172172)和中国地质调查局重点项目(1212010811033、1212011120151)联合资助. |
| 摘 要： | 鲁西花岗-绿岩带是华北克拉通早前寒武纪变质基底典型代表.表壳岩系包括泰山岩群、孟家屯岩组和济宁岩群.其中,泰山岩群是鲁西地区规模最大的表壳岩系,曾认为形成于新太古代早期,而济宁岩群曾认为形成于古元古代.根据野外地质和表壳岩系及相关岩石的锆石SHRIMP U-Pb定年,本文对表壳岩系形成时代进行了重新划分.1)新太古代早期(2.70～2.75Ga)表壳岩系,包括原泰山岩群的雁翎关岩组和柳行岩组下段的大部分及孟家屯岩组.2)新太古代晚期(2.525～2.56Ga)表壳岩系,包括原泰山岩群的山草峪岩组、柳行岩组上段和下段的一部分及济宁岩群.它们在岩石组合、变质变形等方面存在明显区别,BIF形成于新太古代晚期.这是华北克拉通迄今唯一分辨出新太古代早期和晚期表壳岩系的地区. |
| 关 键 词： | BIF SHRIMP定年 新太古代 鲁西 华北克拉通 |
| 收稿时间： | 2012/6/13 0:00:00 |
| 修稿时间： | 2012/9/21 0:00:00 |
Redefinition of Early Precambrian supracrustal rocks and formation age of BIF in western Shandong, North China Craton |
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| WAN YuSheng,LIU DunYi,WANG ShiJin,JIAO XiuMei,WANG Wei,DONG ChunYan,XIE HangQiang and MA MingZhu.Redefinition of Early Precambrian supracrustal rocks and formation age of BIF in western Shandong, North China Craton[J].Acta Petrologica Sinica,2012,28(11):3457-3475. | |
| Authors: | WAN YuSheng LIU DunYi WANG ShiJin JIAO XiuMei WANG Wei DONG ChunYan XIE HangQiang and MA MingZhu |
| Institution: | Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Shandong Institute of Geological Survey, Jinan 250013, China;Shandong Bureau of Geology and Mineral Resources, Jinan 250013, China;Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
| Abstract: | Western Shandong is one of the typical areas in the North China Craton where granite-greenstone belts were well developed. Supracrustal rocks in western Shandong include the Taishan Group (including the Yanlingguan, Shancaoyu and Liuhang formations), Jining Group and Mengjiatun Formation. The Taishan Group and Jining Group were once considered as being formed during the Early Neoarchean and Late Paleoproterozoic, respectively. Based on field observation and SHRIMP U-Pb zircon dating, we redefine the times of deposition of supracrustal rocks in western Shandong: 1) Supracrustal rocks deposited during the Early Neoarchean (2.75~2.70Ga), including the Yanlingguan Formation and most of the lower part of the Liuhang Formation and the Mengjiatun Formation; 2) supracrustal rocks deposited during the Late Neoarchean (2.55~2.525Ga), including the Shancaoyu Formation, the Jining Group, and the upper part and some of the lower part of the Liuhang Formation. They are different in rock association, metamorphism and deformation, with the banded iron formation belonging to the Late Neoarchean supracrustal rock. Western Shandong is the only terrane in the North China Craton where both early and late Neoarchean supracrustal rocks have been identified. |
| Keywords: | BIF SHRIMP dating Neoarchean Western Shandong North China Craton |
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