| 广西晚古生代硅岩的地球化学及其形成的大地构造环境 |
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| 引用本文： | 王忠诚,邝国敦.广西晚古生代硅岩的地球化学及其形成的大地构造环境[J].岩石学报,1995,11(4):449-455. |
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| 作者姓名： | 王忠诚 邝国敦 |
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| 作者单位： | 中国科学院地质研究所，广西地质研究所 |
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| 摘 要： | 广西晚古生代泥盆、石炭纪和二叠纪地层中广泛发育放射虫硅岩，在桂西百色、那坡一带这些地层中的硅岩与玄武岩伴生。而钦州、柳州及河池一带未见到玄武岩。对这些地区硅岩的主元素、微量元素及稀土元素的研究表明：不同地区的硅岩有不同的成因，百色、那坡地区的硅岩形成在深水远洋环境并受到海底火山及热液作用的影响；钦州板城地区的硅岩以生物成因为主；而柳州、河池的硅岩属于离火山、热液活动稍远的生物成因。玄武岩的发现及硅岩成因的判别对探讨广西晚古生代大地构造环境及演化具有重要意义。
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| 关 键 词： | 硅岩，晚古生代，地球化学，广西 |
Geochemistry and Origin of Late Paleozoic Cherts in Guangxiand Their Explanation of Tectonic Environments |
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| Wang Zhongcheng,Wu Haoruo and Kuang Guodun.Geochemistry and Origin of Late Paleozoic Cherts in Guangxiand Their Explanation of Tectonic Environments[J].Acta Petrologica Sinica,1995,11(4):449-455. |
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| Authors: | Wang Zhongcheng Wu Haoruo and Kuang Guodun |
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| Abstract: | Late Paleozoic radiolarian cherts from Baise, Napo, Liuzhou, Hechi and Qinzhou areas inGuangxi were analyzed for major, trace and rare earth elements. The cherts in Qinzhou show biogenic featurescharacterized by a high ratio for Al/ (Al Fe Mn) and no intense Ce anomaly. In contrast to Qinzhou cherts,turbidites, negative Ce anomalies and associated alkalic basalts, those features occurred in siliceous rocks of Baizeand Napo indicate the pelagic environments with large water depth. The chert might also be formed in the submarine hydrothermal environments, as well as by volcanic and biogenic activities. Geochemical features of chertsfrom Liuzhou and Hechi are different from those from Qinzhou and Baize. |
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| Keywords: | Chert Late Paleozoic Geochemistry Guangxi |
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