绵竹城墙岩磷矿特征及沉积环境分析
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作者单位:

1.四川省地质矿产勘查开发局化探队;2.攀枝花市自然资源和规划局

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中图分类号:

P624.6

基金项目:

1:25万绵阳幅修测(1212010880704)


Analysis of the characteristics and sedimentary environment of the Chengqiangyan phosphate in Mianzhu area
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Affiliation:

1.Chemical exploration team of Sichuan Geological and mineral exploration and Development Bureau,Deyang;2.Panzhihua natural resources and Planning Bureau

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    摘要:

    为研究绵竹城墙岩磷矿特征及沉积环境,通过野外地质调查、14个槽探和坑道工程对矿体进行控制,并采集226件矿石样品进行相关测试分析。结果显示:城墙岩磷矿赋矿地层为下泥盆统沙窝子组一段(D3s1),矿体与地层产状基本一致,呈层状、似层状产出,走向300°~357°,倾角31°~56°。矿体厚度1.06~13.86m,品位(P2O5)18.29%~35.57%,品位与含磷层厚度及矿体厚度呈正相关性。其岩相组合为“高岭石粘土质岩—铝磷酸盐岩—磷块岩”; 属典型的“什邡式”磷矿。矿石的自然类型为粘土质或砂砾屑磷块岩矿石,工业类型为硅质及硅酸盐型磷块岩矿石。矿石主要成分P2O5、CaO、I等含量稳定;相关性和聚类分析表明,P2O5、CaO、F密切相关;Fe2O3和A12O3、MgO和CO2紧密相关;Fe2O3、A12O3和RE2O3之间明显相关。微量元素特征值指示,城墙岩磷矿形成于干旱、富氧的边缘海相环境。结合区域成矿地质条件分析认为,磷矿是以风化淋滤沉积作用为主,后期经历滨浅海化学沉积而形成。其找矿标志为震旦系灯影组“花斑”白云岩、泥盆系沙窝子组白云岩→古岩溶侵蚀面、含磷白云岩、含磷粘土岩→硅质磷块岩、粘土质磷矿岩、角砾质磷块岩。

    Abstract:

    In order to study the characteristics and sedimentary environment of Chengqiangyan phosphate mine in Mianzhu City, the ore body was controlled by field geological survey, 14 trenching and tunnel engineering, and 226 ore samples were collected for relevant test and analysis.The results showed that the host strata of Chengqiangyan phosphate deposit are the first member of Shawozi Formation (D3s1) of Lower Devonian, and the ore body is basically consistent with the occurrence of stratum,which is layered and stratoid, with strike of 300°~357 ° and dip angle of 31°~56 °.The thickness of ore body is 1.06~13.86m, and the grade (P2O5) is 18.29%-35.57%. The grade is positively correlated with the thickness of phosphorous layer and ore body, that is a typical Shifang type phosphate mine.The lithofacies assemblage is "kaolinite claystone aluminophosphatite phosphorite".The natural type of the ore is clayey or sandy gravel Phosphorite Ore, and the industrial type is siliceous and silicate phosphorite ore.The contents of P2O5,Cao and I are stable; correlation and cluster analysis show that P2O5,Cao and F are closely related;Fe2O3 and A12O3,MgO and CO2 are closely related; Fe2O3, A12O3 and RE2O3 are obviously related. The characteristic values of trace elements indicate that the wall rock phosphorite was formed in the dry and oxygen rich marginal marine environment. Based on the analysis of regional metallogenic geological conditions, it is considered that the phosphate ore is mainly formed by weathering leaching sedimentation and later by chemical sedimentation in the coastal shallow sea.The prospecting criteria are as follows:Sinian Dengying Formation"flower spot" dolomite, Devonian Shawozi formation dolomite→paleokarst erosion surface,phos-phorous dolomite, phosphorous clay rock→siliceous phosphorite, clayey phosphorite,breccia phosphorite.

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黎龙昌,刘亮,周娟娇,等. 绵竹城墙岩磷矿特征及沉积环境分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2020-08-21
  • 最后修改日期:2020-11-13
  • 录用日期:2020-12-20
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