| 贵州省瓮福磷矿沉积环境及矿床成因探讨 |
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| 引用本文： | 叶德书,赵爽,陈海,钟祖峰.贵州省瓮福磷矿沉积环境及矿床成因探讨[J].矿产与地质,2014(4):422-430. |
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| 作者姓名： | 叶德书 赵爽 陈海 钟祖峰 |
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| 作者单位： | 贵州省地矿局106地质大队,贵州遵义563000 |
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| 摘 要： | 瓮福磷矿沉积的有利场所是潮下海湾浅滩环境,而不是潮坪。海湾的大小又控制着矿床的规模,海滩能量的差异影响着磷矿石的不同结构成因类型。矿石的结构,从凝胶―细砂屑与砂屑颗粒由细变粗;岩石的颜色由灰褐、黑色(多陆屑、富有机炭及黄铁矿)变为浅灰、灰白色;矿层中P2O5含量随之渐增,而且CaO含量变化与P2O5含量变化同步,说明水动力条件由弱渐强,反映了沉积环境由潮汐作用为主的海湾环境。为此,陡山沱组以浅水碳酸盐优势岩相的地层条件是成磷的前提;温暖、干燥的古气候提供了有利于磷质的析出及沉积;适宜的海滩古地理环境提供了最佳的成矿场所;"黔中隆起"的古构造条件是磷矿的分布及富矿形成的最主要的控制因素。
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| 关 键 词： | 磷矿 沉积环境 瓮安 贵州 |
Sedimentary environment and deposit genesis of Wengfu phosphorus deposit in Guizhou |
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| YE De-shu,ZHAO Shuang,CHEN Hai,ZHONG Zu-feng.Sedimentary environment and deposit genesis of Wengfu phosphorus deposit in Guizhou[J].Mineral Resources and Geology,2014(4):422-430. |
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| Authors: | YE De-shu ZHAO Shuang CHEN Hai ZHONG Zu-feng |
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| Institution: | (No. 106 Geological Brigade of Guizhou Provincial Bureau of Geology and Mineral, Zunyi, Guizhou 563000) |
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| Abstract: | The favorable location of sediment of Wengfu phosphorus deposit is subtidal bay shoal milieu in-stead of tidal flat.The size of bay controls the scale of deposit,and different beach energy results in different structural genesis types of phosphate ores.The structure of ores varies from coarse-grained to fine-grained gelatin-fine-grained-arene and arene,and the color of rocks varies from taupe and black （multi-terrigenous clastic,rich organic carbon and pyrite）to light gray and linen.The content of P2 O5 in ore bed increases ac-cordingly,and the change of CaO content is proportionate to that of P2 O5 content,and it suggests that hy-drodynamic condition becomes stronger,and it reflects that sedimentary environment turns into bay environ-ment dominated by tidal action.Hence,formation conditions of shallow-water carbonate dominance lithofa-cies in Doushantuo Formation is the prerequisite of phosphorus mineralization.Warm and dry palaeoclimate provides favorable conditions for precipitation and sediment of phosphorus,and suitable beach palaeogeo-graphic environment build the perfect locale for mineralization.The palaeotectonic condition of “uplift in middle Guizhou”is the most primary controlling factor in distribution of phosphorus deposits and formation of high-grade ores. |
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| Keywords: | phosphorus deposit sedimentary environment Weng’an Guizhou |
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