| 滇东昆阳磷矿成矿物质来源及其沉积环境 |
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| 引用本文： | 陈瑞红,赵锴.滇东昆阳磷矿成矿物质来源及其沉积环境[J].矿产与地质,2021(1):70-75,89. |
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| 作者姓名： | 陈瑞红 赵锴 |
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| 作者单位： | 云南磷化集团工程建设有限公司;桂林理工大学广西隐伏金属矿产勘查重点实验室 |
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| 基金项目： | 国家自然科学基金“哀牢山新元古代岩浆作用及其动力学机制”(41502180)资助。 |
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| 摘 要： | 昆阳磷矿位于滇池西南部,为探讨该磷矿的成矿物质来源及其沉积环境,从岩相学和元素地球化学两方面对磷矿石展开了研究。研究结果显示,磷块岩矿石的主要矿物成分为胶磷矿,矿体w(P 2 O 5)平均含量为26.16%,磷块岩P 2 O 5含量由地表向地下沿倾向逐渐降低,酸不溶物含量逐渐增加,在垂直剖面上,矿区中部P 2 O 5含量相对上部和下部要高。矿石结构由下至上为砾屑结构、粒屑-鲕状结构、粒屑-粉晶结构,反映了磷块岩沉积时水动力条件由高能向低能过渡。磷块岩中发育的粒序层理、潮汐层理、火焰状构造等说明其是在强海流、强风浪的冲刷簸选过程中形成,随后,水动力条件减弱,富集成矿。综合研究表明,本区磷矿床磷的初始物质来源是富磷的陆源碎屑物和富磷质的海洋生物,其沉积环境主要为浅海浪基面以上的陆缘坻、台地、浅海盆地等。
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| 关 键 词： | 昆阳磷矿 磷块岩 成矿物质来源 沉积环境 滇东 |
Ore-forming material source and sedimentary environment of Kunyang phosphate deposit in East Yunnan |
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| CHEN Ruihong,ZHAO Kai.Ore-forming material source and sedimentary environment of Kunyang phosphate deposit in East Yunnan[J].Mineral Resources and Geology,2021(1):70-75,89. |
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| Authors: | CHEN Ruihong ZHAO Kai |
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| Institution: | (Yunnan Phosphate Chemical Group Co.,Ltd.,Kunming 650600,Yunnan,China;Guangxi Key Laboratory of Exploration for Hidden Metallic Ore Deposits,Guilin University of Technology,Guilin 541006,Guangxi,China) |
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| Abstract: | Kunyang phosphate deposit is located at the southwest of Dianchi Lake in Yunnan Province.In order to explore the metallogenic material source and sedimentary environment of the phosphate deposit,the phosphate ore is studied in the aspects of petrography and elemental geochemistry.The study result shows that phosphorite ore is mainly composed of collophanite with P 2 O 5 content of 26.16%.The P 2 O 5 content of phosphorite decreases gradually from the surface to underground in the dipping trend,and the content of acid insoluble materials increases gradually.In the vertical section P 2 O 5 content of the orebody is higher than that in the upper and lower parts.From the bottom to top,the ore texture is shown as the gravel texture,grain-olitic texture and grain-powder crystal texture,which reflects the transition of hydrodynamic condition from high energy to low energy during the deposition of phosphate rock.The grain sequence stratification,tidal bedding and flame structure developed in phosphate rock indicate that it is formed during the scouring and winnowing process of strong current and strong wind wave.Subsequently,the hydrodynamic condition is weakened and the mineralization is enriched.The comprehensive study result shows that the primary source of phosphorus in this area is phosphorus-rich terrestrial debris and phosphorus-rich marine organism.The sedimentary environment is mainly the epicontinental chi,platform and shallow sea basin above the surface of shallow waves. |
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| Keywords: | Kunyang phosphate deposit phosphorite metallogenic material source sedimentary environment East Yunnan |
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