| 贵州瓮福磷矿含磷岩系层序特征及黔中古陆控矿意义 |
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| 引用本文： | 宋小军,曾道国,巩鑫,刘波,杜蔺,李光春,曾凡祥,苏永虎,郭东杭,张能,罗勇军.贵州瓮福磷矿含磷岩系层序特征及黔中古陆控矿意义[J].地质找矿论丛,2021,36(1):19-28. |
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| 作者姓名： | 宋小军 曾道国 巩鑫 刘波 杜蔺 李光春 曾凡祥 苏永虎 郭东杭 张能 罗勇军 |
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| 作者单位： | 贵州省有色金属和核工业地质勘查局地质矿产勘查院, 贵阳 550005 |
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| 基金项目： | 国家自然科学基金项目（编号：U1812402）资助。 |
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| 摘 要： | 新元古代末期震旦系陡山沱阶和早古生代早期寒武系梅树村阶是全球两大成磷时期。贵州瓮福磷矿含磷岩系—早震旦世陡山沱组磷矿a矿层与b矿层,是震旦系陡山沱阶成磷事件的典型代表。瓮福磷矿含磷岩系为在浅水陆棚地区沉积的一套与磷矿有成因联系的岩石组合,属于浅海台地相型;含磷岩系具备早期准备阶段、磷质富集阶段及晚期磷质贫化消失阶段的沉积特征,在纵向上呈三段式递变;以陡山沱组内三段(Z_1d~3)与四段(Z_1d~4)侵蚀间断面分隔,两次海侵旋回造成两次磷质的富集,经生物化学、机械破碎簸选及后期改造形成a、b两层工业磷矿体。瓮福磷矿陡山沱期构造位置位于上扬子陆块东南部,雪峰运动结束冒地槽沉积造就了黔中古陆以及东部半封闭的海湾浅滩。瓮福磷矿陡山沱期处于黔中古陆东缘,东临大海,整体地势西高东低;以黔中古陆为中心,从西到东、由陆向海形成古陆—滨岸—浅海—深海的古地理格局。黔中古陆在陡山沱期两次海侵旋回中,一方面其边缘海湾浅滩为磷质富集提供有利的沉积环境,另一方面其遭受剥蚀和夷平作用后为磷块岩矿床的形成提供含石英、长石、白云石、黏土等矿物的陆源碎屑。通过典型岩相剖面分析,黔中古陆边缘海湾浅滩的沉积环境及岩相直接控制了瓮福磷矿床的形成和分布,其具有重要的控矿意义。
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| 关 键 词： | 含磷岩系 层序特征 黔中古陆 控矿意义 瓮福磷矿 贵州 |
| 收稿时间： | 2020/6/4 0:00:00 |
Characteristics of phosphate rock series sequenc in Wengfu phosphate deposit and ore control significance of the Qianzhong ancient continent |
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| SONG Xiaojun,ZENG Daoguo,GONG Xin,LIU Bo,DU Lin,LI Guangchun,ZENG Fanxiang,SU Yonghu,GUO Donghang,ZHANG Neng,LUO Yongjun.Characteristics of phosphate rock series sequenc in Wengfu phosphate deposit and ore control significance of the Qianzhong ancient continent[J].Contributions to Geology and Mineral Resources Research,2021,36(1):19-28. |
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| Authors: | SONG Xiaojun ZENG Daoguo GONG Xin LIU Bo DU Lin LI Guangchun ZENG Fanxiang SU Yonghu GUO Donghang ZHANG Neng LUO Yongjun |
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| Institution: | Geological and Mineral Exploration Institute, Nonferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou, Guiyang 550005, China |
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| Abstract: | The late Neoproterozoic Sinian Doushantuo Stage and the Early Paleozoic Early Cambrian Meishucun Stage are the two major phosphorus-forming periods in the world. Phosphate ore layer a and b of the phosphate deposits in the Early Sinian Doushantuo Formation in Wengfu Phosphate deposit are the typical representatives of the Sinian Doushantuo phosphorus-forming event. The phosphorus rock series is a rock association deposited in the shallow shelf area and related genetically to the phosphate deposit belonging to the shallow-sea platform sedimentary facies. Sedimentation of the phosphorous rock series shows the early preparation stage, the enrichment stage and the late phosphorus-depletion stage and three-stage gradual changes in the vertical direction. The two phosphorous enrichments brought by two transgression cycles are separated by the erosion discontinuities between the third (Z1d3) and fourth (Z1d4) members in the Doushantuo Formation which turn to the industrial ore layer a and b through biochemistry, mechanical crushing and separation. The Doushantuo period tectonics is positioned in the southeast Upper Yangtze Block. At end of the Xuefeng movement miogeosynclinal sedimentation resulted in the Qianzhong ancient continent and the semi-closed bay shoal in the east. The Doushantuo Stage of Wengfu Phosphate Mine is located on the eastern margin of the Qianzhong ancient continent facing the sea to the east. The overall terrain is high-low from the west to the east and is configured from the west to the east the paleogeographic pattern: ancient continent-shore-shallow-deep sea. During the two transgression cycles in the Doushantuo period the Qianzhong ancient continent provided a favorable sedimentary environment for phosphorus enrichment on the marginal shoals of the bay on the one hand, on the other hand, erosion and leveling of the continent provided terrestrial debris of quartz, feldspar, dolomite, clay and other minerals for formation of the phosphorite deposit. Through the analysis of typical lithofacies profile, the sedimentary environment and lithofacies of the bay shoal on the margin of the Qianzhong ancient continent is of ore-controlling significance. It directly controls the formation and distribution of the Wengfu phosphate deposit. |
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| Keywords: | phosphorous rock series sequence characteristics Qianzhong ancient continent ore-controlling significance Wengfu phosphate deposit Guizhou |
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