| 四川地区上二叠统吴家坪组条带状硅质岩成因分析 |
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| 引用本文： | 李蔚洋,刘杰,何幼斌.四川地区上二叠统吴家坪组条带状硅质岩成因分析[J].海相油气地质,2011,16(2):61-65. |
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| 作者姓名： | 李蔚洋 刘杰 何幼斌 |
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| 作者单位： | 1. 江汉油田勘探开发研究院
2. 长江大学地球科学学院 |
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| 摘 要： | 四川盆地上二叠统吴家坪组条带状硅质岩分布广泛,所含生物主要为体小壳薄的有孔虫、介形虫、腕足类、双壳类等,缺乏放射虫,偶见海绵骨针.显微薄片显示,生物屑多被硅化,见残余方解石碎屑.MnO/TiO2值平均为4.5,Al-FeMn判别图解多数样品落干Ⅰ区,Co/Ni值平均为0.127,稀土元素总量平均为1.4778×10-6...
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| 关 键 词： | 硅质岩 岩石成因 沉积作用 吴家坪组 四川盆地 |
Origin of Upper Permian Wujiaping Banding Siliceous Rock in Sichuan Basin |
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| Li Weiyang,Liu Jie,He Youbin.Origin of Upper Permian Wujiaping Banding Siliceous Rock in Sichuan Basin[J].Marine Origin Petroleum Geology,2011,16(2):61-65. |
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| Authors: | Li Weiyang Liu Jie He Youbin |
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| Institution: | Li Weiyang,Liu Jie,He Youbin Exploration and Development Research institute,SINOPEC Jianghan Oilfield Company,Qianjiang,Hubei,433124 China |
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| Abstract: | Late Permian Wujiaping banding siliceous rock is widely distributed in the upper Yangtze area.Small foraminifera,ostracoda,brachiopod and dissoconch are common but radiolaria is Lack of and calthrop is rare.The observation of microscopic sections has shown that pioclasts are most silicated and residual calcites can be found.Average ratio of MnO/TiO2 is 4.5.There are 4 specimens that fall in domainⅠin the Al-Fe-Mn discrimination diagram.The ratios of Co/Ni are less than 0.5 with the average of 0.127.Total volume of the rare-earth element is 1.4778×10-6.The values of ∑LREE/∑HREE are less than 1.The HREE has a concentration tendency.All of these characteristics indicate that the Si in the silica rock derives from the hydrothermal deposits.It is believed that the silica rock is a deposition-alternation product,which was caused by metasomatosis of limestone.The silica rock is commonly built up in the deepwater slope and partly in the open platform so that it formed in the same depositional environment with carbonate rock. |
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| Keywords: | Siliceous rock Rock origin Deposition Upper Permian Sichuan Basin |
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