| 黔北牛蹄塘组的地球化学特征及形成环境 |
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| 引用本文： | 袁宏,肖加飞,何熙琦,白平.黔北牛蹄塘组的地球化学特征及形成环境[J].贵州地质,2007,24(1):55-59,63. |
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| 作者姓名： | 袁宏 肖加飞 何熙琦 白平 |
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| 作者单位： | 1. 贵州省地质调查院,贵州,贵阳,550004
2. 中国科学院地球化学研究所,贵州,贵阳,550002 |
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| 摘 要： | 贵州北部早寒武世的黑色岩系-牛蹄塘组。主要为黑色页岩,含浮游生物,其中产钼、钒等矿床。其具有独特的元素地球化学特征:K、Ti元素在黑色页岩中的含量高于底部硅质岩,而P元素的含量却相反,硅质岩中的含量显著高于其上覆的黑色页岩;岩孔和菜园两地的共同特点是V、Ba、U的含量明显偏高,富集系数在3以上,显著的差别是Ta元素,其在岩孔是亏损的,而在菜园却明显富集;西部岩孔的稀土总量高于东部菜园,稀土配分曲线形态近于水平或略向左倾,具弱的负Eu异常或不显异常。硅质岩较页岩的负Ce异常程度高。地层特征、元素地球化学特征及特征元素和比值,所反映的是下寒武统牛蹄塘组形成于缺氧的还原环境。
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| 关 键 词： | 牛蹄塘组 黑色岩系 地球化学 缺氧沉积 黔北 |
| 文章编号： | 1000-5943（2007）01-0055-05 |
| 修稿时间： | 2006-12-26 |
Geochemical Characteristics and Formation Environment of the Niutitang Formation in the North Guizhou |
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| YUAN Hong,XIAO Jia-fei,HE Xi-qi,BAI Ping.Geochemical Characteristics and Formation Environment of the Niutitang Formation in the North Guizhou[J].Guizhou Geology,2007,24(1):55-59,63. |
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| Authors: | YUAN Hong XIAO Jia-fei HE Xi-qi BAI Ping |
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| Institution: | 1. Guizhou Academy of Geology Surveying, 550004, Guizhou, China ; 2 Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, Guizhou , China |
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| Abstract: | Black rock series of the lower Cambrian Niutitang Formation in the north Guizhou as part of deoxidized event in South China is a suit of sediments of transgressive system domain with low ratio deposition,mainly consist of black shale with developed lamination in which produce molybdenum and vanadium deposits.Special geochemical characteristics of the elements that potassium and titanic element contents in black shale are higher than silicalite at base,but phosphor element is contrary in content, which in silicalite is significantly higher than overlying black shale;the common properties at Yankong and Caiyuan two sites show apparently high vanadium,barium and uranium contents,rich coefficient is above 3,distinguished variety is tantalum element loss at Yankong but apparent concentration at Caiyuan;totally,rare earth in western Yankong is higher than in eastern Caiyuan,rare earth distribution pattern is close to horizon or lightly dipping left and take on weak Eu anomaly or no anomaly.Silicalite is higher in negative cerium than shale.Stratigraphic characteristics,elementary geochemical feature and ratio indicate that the Niutitang Formation of lower Cambrian Epoch formed in the deoxidized surroundings lack of oxidation. |
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| Keywords: | Niutitang Formation black rock series geochemical anoxic sediment north of Guizhou |
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