| 贵州织金寒武系磷矿沉积特征及灯影组古喀斯特面控矿特征研究 |
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| 引用本文： | 毛铁,杨瑞东,高军波,毛家仁.贵州织金寒武系磷矿沉积特征及灯影组古喀斯特面控矿特征研究[J].地质学报,2015,89(12):2374-2388. |
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| 作者姓名： | 毛铁 杨瑞东 高军波 毛家仁 |
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| 作者单位： | 1) 贵州大学资源与环境工程学院, 贵阳, 550025；2) 贵州工业工程技术投资有限公司，贵阳，550000;贵州大学资源与环境工程学院, 贵阳, 550025;贵州大学资源与环境工程学院, 贵阳, 550025;贵州大学资源与环境工程学院, 贵阳, 550025 |
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| 摘 要： | 在上扬子地台早寒武纪梅树村期,沉积了许多大型磷块岩矿床。贵州寒武系底部磷块岩发育,是我国重要含磷层位。贵州寒武系底部磷矿的研究历史比较悠久,研究方向主要还是集中于含磷物质来源以及磷块岩成因方面的研究。前者主要解决的是磷质来源与磷质赋存问题,但对于磷矿的就位问题研究较少。因此,对于磷矿控矿规律及含磷岩系沉积微相等有待深入。在总结前人研究的的基础上,对贵州织金-清镇一带寒武系底部含磷岩系进行大量的野外调查、剖面测试以及地质资料总结分析。认为清镇地区处于潮下低能泻湖环境,以条带状磷块岩和条带状磷质硅质岩为特征;织金戈仲伍一线,属于潮间-潮下高能沉积环境,沉积碎屑状磷块岩为主,局部沉积小壳生物磷块岩;织金熊家场浅滩和生物滩发育,属于潮上沉积环境。另外通过钻孔资料分析,发现织金地区寒武系底部磷块岩厚度变化很大,主要受灯影组顶部古喀斯特不整合面控制,滨岸磷质碎屑受沿岸海流的改造,搬运至古喀斯特洼地地区堆积,形成较厚度的碎屑状磷块岩。古喀斯特高地地区,受滨岸海流影响,沉积的磷块岩较薄,因此,建立织金寒武系磷块岩成矿控矿模式。该研究对贵州寒武系底部磷矿找矿预测工作有一定的理论和实际意义。
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| 关 键 词： | 贵州 下寒武统 磷矿成矿 古喀斯特面 控矿模式 |
| 收稿时间： | 9/3/2014 12:00:00 AM |
| 修稿时间： | 2014/11/26 0:00:00 |
Study of Sedimentary Feature of Cambrian Phosphorite and Ore controlling Feature of Old Karst Surface of the Dengying Formation in Zhijin, Guizhou |
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| MAO Tie,YANG Ruidong,GAO Junbo and MAO Jiare.Study of Sedimentary Feature of Cambrian Phosphorite and Ore controlling Feature of Old Karst Surface of the Dengying Formation in Zhijin, Guizhou[J].Acta Geologica Sinica,2015,89(12):2374-2388. |
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| Authors: | MAO Tie YANG Ruidong GAO Junbo and MAO Jiare |
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| Institution: | 1) College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025;2) Guizhou Zhengye Engineering Investment Co.Ltd., Guiyang, 550000;College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025;College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025;College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025 |
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| Abstract: | A number of large scale phosphorite deposits were developed within the Upper Yantze Platform during Meishucun Stage of early Cambrian Period. The lower Cambrian stratum in Guizhou province, with well developed phosphatic rock, is very important P bearing sequence in China. Study of phosphatic deposits in the lower Cambrian stratum has lasted a long period with the focus on the material source and genesis of phosphorous rocks. The former issue deals with the material source and the occurrence of phosphorus, but less concern has been given on emplacement mechanism of the phosphorus. Therefore, further study should be carried out on factors controlling ore forming, sedimentary microfacies of phosphorous bearing strata. Combined with summarization for previous work, this study conducted field survey, geological profiles measurement and sampling for the phosphorous bearing rock series in the Zhijin Qingzhen area in Guizhou Province. It was found that Qingzhen area was a low energy subtidal paleo lagoon, deposition of which was characterized by banded phosphorites and phosphorous siliceous rocks. While the Gezhongwu in the Zhijin area was a high energy intertidal subtidal zone, the deposition of which is mainly fragmental phosphorites, with only partialy small shell biological phosphorite distributing randomly. The Zhijin Xiongjiachang area was a supratidal zone, where shallow shoal and biologic beach developed. Through the analysis of bore information, it can be found that phosphorite thickness occurred at the bottom of Cambrian varies greatly in the Zhijin area, which is mainly controlled by fossil karst unconformity level at the top of the Dengying Formation. The shore phosphatic fragments was transformed by coastal current, moved into the depression area of fossil karst and then accumulated, forming thicker clastic phosphorite than the highlands of fossil karst. Therefore, according to the above mentioned information, this paper has constituted the ore forming model of Cambrian phosphorite in the Zhijin area. This study has certain theoretical and practical significance to exploration for phosphate deposits in the lower Cambrian of Guizhou Province. |
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| Keywords: | Guizhou Province Lower Cambrian phosphorous mineralization fossil karst unconformity ore controlling model |
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