| 中国东部燕山期大火成岩省:岩浆-构造-资源-环境效应 |
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| 引用本文：曾普胜,李睿哲,刘斯文,温利刚,赵九江,王十安.2021.中国东部燕山期大火成岩省:岩浆-构造-资源-环境效应[J].地球学报,42(6):721-748. |
| DOI：10.3975/cagsb.2021.112602 |
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| 基金项目:中国地质科学院基本科研业务费项目(编号: JYYWF20180101);中国地质调查局地质调查项目(编号: DD20190589; DD20160220; DD20190703);自然科学基金项目(编号: 41072073) |
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| 中文摘要:中国东部燕山期的大规模岩浆活动, 即侏罗纪—白垩纪(150—100 Ma)的碱性流纹岩-碱性玄武岩-金伯利岩-钾镁煌斑岩-碳酸岩及其管道系统, 分布于江南造山带内侧和郯庐断裂带南段以西的华北地台内, 累积面积超过30万km2。该期短时限内大规模活动的岩浆事件代表了中国东部地质历史演化中的一次大火成岩省(LIP)事件, 实质控制着中生代以来中国华北—扬子地台的构造格局变化、资源能源形成与地质环境变迁。晚侏罗世—早白垩世(150—100 Ma)的大火成岩省, 是中生代中期古太平洋大火成岩省沿中国克拉通东部边缘活动的一部分, 是包括昂通爪哇(Ongtong-Java)(Mahoney et al., 1993; Ingle and Coffin, 2004)—中国东部在内的超级地幔柱上涌, 在岩石圈板片对流, 挤压地幔物质快速上升, 引起陆域内长英质地壳物质大规模重熔的结果, 形成: (1)髫髻山组—张家口组碱性流纹质-玄武质双峰式火山岩及其管道系统, 与华北大规模金-多金属矿成矿作用密切相关; (2)辽宁瓦房店—山东蒙阴—安徽栏杆, 湖南宁乡—贵州镇远一带的金伯利岩—钾镁煌斑岩±碳酸岩±基性超基性杂岩及其管道系统, 与金刚石、金-铂族元素等成矿关系密切; (3)辽东—胶东半岛、南岭—滇黔桂交界地区的连片花岗岩, 是硅质大火成岩省(SLIP)的管道系统(plumbing systems), 与金刚石矿、金-铂族元素矿、钨锡铌钽矿、锂-钾-铷-铯-铀矿等, 以及油气等战略性关键金属成矿关系密切。同时, 巨型岩浆作用引发的富含钾、磷及稀土等微量元素的基岩形成优质土壤层对生态多样性的助益等有利和/或有害的环境效应, 直接关系到地球家园的生态环境。因此, 中国东部燕山期大火成岩省产生深刻的岩浆-构造-资源-环境效应。 |
| 中文关键词:大火成岩省 战略性关键矿产 岩浆-构造-资源-环境效应 燕山期 中国东部 |
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| Yanshanian Large Igneous Provinces in Eastern China:Magmatism-Tectonics-Resources-Environment Effects |
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| Abstract:The yanshanian large-scale magmatic activity in eastern China, namely, the Jurassic–Cretaceous (150–100 Ma) alkaline rhyolites, alkaline basalts, kimberlites, lamproites, carbonatites, and their plumbing systems, distributed in the inner part of the Jiangnan Orogenic Belt and the North China Platform to the west of the southern segment of the Tan-Lu Fault Zone, has a cumulative area of more than 300 000 km2. The large-scale magmatic event during this period represents a Large Igneous Province (LIP) event in the geological history of eastern China, which essentially controls the tectonic changes, resources, energy formation, and geological environmental changes in the North China-Yangtze Platforms since the Yanshanian. The Late Jurassic–Early Cretaceous (150–100 Ma) LIP was part of the mid-Mesozoic Paleo–Pacific Large Igneous Province along the eastern margin of the China Craton. It resulted from the upwelling of the super mantle plume, convecting of the lithospheric slabs, and squeezing of the mantle material for rapid uplifting wthin a huge area covering the Ongtong– Java (Mahoney et al., 1993; Ingle and Coffin, 2004) –eastern China, forming the following: (1) Tiaojishan– Zhangjiakou formation, alkaline rhyolitic basaltic bimodal volcanic rocks, and their plumbing systems are closely related to large-scale gold-polymetallic mineralization in North China; (2) Kimberlites–lamproites ± carbonatites ± mafic-ultrabasic complexes and their plumbing systems distrubuted in the belts as Wafangdian, Liaoning; Mengyin, Shandong; Langan, Anhui; Ningxiang, Hunan; and Zhenyuan, Guizhou; closely related to the mineralization of diamond, gold–platinum group elements, and other elements; and (3) The Contiguous granites, distributed in the regions as liaodong Peninsula, Nanling and Dian-Guizhou–Guangxi border area, are the plumbing systems of sillic large igneous provinces, and are closely related to the mineralization of diamond, gold-platinum group element, tungsten, tin, niobium and tantalite, lithium, potassium, rubidium, cesium and uranium, oil-gas, and other strategic key metals. At the same time, the beneficial and/or harmful environmental effects of the formation of high-quality soil layers from the bedrock rich in trace elements, such as potassium and phosphorus, and rare earth caused by giant magmatism are directly related to ecological environment of Earth. Therefore, the Yanshanian LIP in eastern China has produced profound magmatic-tectonic-resources-environmental effects. |
| keywords:Large Igneous Province(LIP) strategic minerals magamatic-tectonic-resources-environmental effects Yanshanian eastern China |
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