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| 鲁西隐伏含铁岩系——前寒武纪济宁岩群地球化学特征及沉积环境 | |
| 引用本文： | 宋明春,焦秀美,宋英昕,李培远,万国普.鲁西隐伏含铁岩系——前寒武纪济宁岩群地球化学特征及沉积环境[J].大地构造与成矿学,2011,35(4). |
| 作者姓名： | 宋明春 焦秀美 宋英昕 李培远 万国普 |
| 作者单位： | 1. 山东省地质矿产勘查开发局,山东济南,250013 2. 成都理工大学地球科学学院,四川成都,610059 3. 山东省物化探勘查院,山东济南,250013 |
| 基金项目： | 山东省地质矿产勘查开发局科研项目(批准文号:鲁地字[2007]25号)资金资助 |
| 摘 要： | 济宁岩群是分布于山东省鲁西南地区的隐伏浅变质地层,埋深大于900m,由变火山碎屑岩组、含铁岩组和千枚岩组组成,是一套海相火山-沉积岩系。岩石中SiO2、Al2O3、Fe2O3、K2O等亲陆元素含量高,岩石化学的成熟度指数不高,反映其源岩是鲁西TTG岩系;m值(4.75～31.86)和MnO/TiO2(0.05～0.2)值低,指示了海陆过渡性近岸浅海陆架沉积环境。富集轻稀土、重稀土平坦、铕异常不明显;微量元素K、Rb、Ba富集,贫Nb、Ti和P、Cr。Sr/Ba值(主要为0.16～0.77)小,指示沉积时的盐度较低;V/(V+Ni)值较高(>0.46),形成于还原环境。岩石的δ13CV-PDB=-4.7‰～-15‰,δ18OV-PDB=-12.1‰～-18.8‰,δ30SiNBS-28=-0.8‰～-1.2‰,数值较低,显示了热水沉积特征。济宁岩群是受华北克拉通1.8Ga大陆裂解事件影响形成的裂谷型热水沉积。 |
| 关 键 词： | 济宁岩群 地球化学 沉积环境 热水沉积 |
Geochemical Characteristics and Sedimentary Environment of Precambrian Jining Group in Western Shandong Province |
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| SONG Mingchun,JIAO Xiumei,SONG Yingxin,LI Peiyuan,WAN Guopu.Geochemical Characteristics and Sedimentary Environment of Precambrian Jining Group in Western Shandong Province[J].Geotectonica et Metallogenia,2011,35(4). | |
| Authors: | SONG Mingchun JIAO Xiumei SONG Yingxin LI Peiyuan WAN Guopu |
| Institution: | SONG Mingchun1,JIAO Xiumei1,SONG Yingxin 2,LI Peiyuan3 and WAN Guopu3(1.Shandong Provincial Bureau of Geology and Mineral Resources,Jinan 250013,Shandong,China,2.College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,Sichuan,3.Shandong Provincial Academy of Geophysical and Geochemical Prospecting,China) |
| Abstract: | The Jining Group is a set of hidden low-grade metamorphic marine volcano-sedimentary strata distributed in southwestern Shandong Province buried under more than 900 m.This paper studies the lithological and geochemical characteristics and formation environment based on study of the drilling cores.The research is of importance for discussing regional tectonic evolution,analyzing the origin of iron deposit and guiding further exploration.The Jining Group is mainly composed of sericite phyllite,chlorite serici... |
| Keywords: | Jining Group geochemistry sedimentary environment hydrothermal sedimentation |
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