| 兴神保磷矿含磷岩系沉积环境分析 |
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| 引用本文： | 郑文忠,东野脉兴.兴神保磷矿含磷岩系沉积环境分析[J].沉积学报,1993,11(4):8-16. |
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| 作者姓名： | 郑文忠 东野脉兴 |
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| 作者单位： | 化工部化学矿产地质研究院, 河北涿州 |
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| 摘 要： | 兴神保磷矿赋存于震旦系陡山沱组中下部,磷块岩主要为原地生物、生物化学成因的团粒、藻菌粒、壳粒、叠层石组成。它们形成于低能还原-弱氧化条件的浅水盆地,泻湖及浪基面附近的浅滩环境。按含磷岩系沉积特征划分出三个沉积相区。古隆起控制着磷块岩的时空分布。
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| 关 键 词： | 磷块岩 原地堆积 低能浅水 古地理控矿 |
Discussion on the Sedmeatary Environment of the Phosphorus Bearing Rock Series in the Xingshenbao Phosphorus Deposits |
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| Institution: | Geological Institute for Chemical Minerals Product, Ministry of Chemical Industry |
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| Abstract: | The Xingshenbao phosphorus deposits locates in the westein Hubei Province and phosphorite is presented in the middle and lowar Doushantuo Formation of Sinisn System. Thickness of the rock series bearing phosphorus is 12. 4 -473.5m and the rock series bearing phosphoras consisis of dolomite bearing manganese, botia, mud stctie, phosphorite and dolomite. The phospholite thickness is 1. 9-17. 6m and the average content of P2O5 is 22. 80%. According to saditagry sheractaristics of the cook series bearing phosphorus is divided into three region of sedimentary facies. They are shallew besin facics in Wawu, lagoon facies in Zhengjiahe and tidal flatfacies in the Tangzhaying. The industrial phosphorites scdirnented in the shallow basin and lagoon and consists of comular spharolth , alga and bacteria granula , shelly granula and stromatolite etc. . which have been produced by organisnis and biochemical activity as have been accumulted in the orginal phace. It is controled that origin of phosphorus and organisms activity, therefore only forms lean min-earls or does't form mineral in the tidal. The Tangzhaying - Paiguoping palaeo-rise controls the time and space distribution of phosphorite in region. Researches of petrology and geochemistry indicate there is a lagoon circumstance with hypersaline during the early period of the rock series bearing phosphorus and the tidal flat circumstance in the late period, which is affected by the leaching action of fresh water. During the early period for the formation of phosphorite are the shallow basin and lagoen with the lower energy, which forms algal met phosphorite, algal and bacteria one and pelletal one. During the late period for the formation of phosphorite are algal hill and bank, which forms stromatolithic phosphorite and slelly granule one. The firsh phosphorus ore bed (Ph1) sedimented in reducing circcnstance and the second one (Ph1) in week oxidation. The rock series bearing phosphorus is a regression sedimenting scquece under whole transgre-sion condition. |
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