多项式趋势面分析在磷块岩深部勘探中应用:以瓮福磷矿英坪矿段为例  

Application of polynomial trend surface analysis in the exploration of phosphorite in depth:Taking the Yingping oreblock of Wengfu deposit as an example

作　　者：罗俊峰 周光红 苏之良 文瑞成 蔡健龙 欧义 罗泰义[4] LUO Jun-feng;ZHOU Guang-hong;SU Zhi-liang;WEN Rui-cheng;CAI Jian-long;OU Yi;LUO Tai-yi(Institute of Geology and Mineral Exploration,Guizhou Bureau of Non-ferrous Metals and Nuclear Industry,Guiyang 550005,China;School of Geography and Resources,Guizhou Education University,Guiyang 550018,China;Wengfu(Group)Co.,Ltd.,Fuquan 550509,China;The State Key Laboratory of Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China)

机构地区：[1]贵州省有色金属和核工业地质勘查局地质矿产勘查院,贵州贵阳550005 [2]贵州师范学院地理与资源学院,贵州贵阳550018 [3]瓮福(集团)有限责任公司,贵州福泉550509 [4]中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州贵阳550081

出　　处：《矿物学报》2023年第4期533-546,共14页Acta Mineralogica Sinica

基　　金：贵州师范学院国家科技部和国家自然科学基金项目奖励补助资金项目(编号:黔科合平台人才[2018]5778-04);国家自然科学基金项目(编号:41802027;U1812402);贵州省高等学校数字乡村创新团队(编号:黔教技[2023]076号)。

摘　　要：磷块岩是重要的磷矿资源,主要发育于大陆边缘的台地相,在一定空间范围内磷块岩厚度具有稳定而缓慢变化的特点,多项式趋势面分析方法非常适于刻画这种空间演化特征。本次研究收集了瓮福磷矿田高坪矿区英坪矿段B矿层未经历后期断层破坏或抬升剥蚀的88项勘探工程资料,以B矿层厚度为因变量,以工程的地理坐标为自变量,开展1~5次多项式趋势面分析方法在沉积磷矿床深部勘探的示范性研究。获得如下主要认识:1)坐标选择:根据勘探范围的空间尺度,通过坐标平移进行坐标简化,能更加突出因变量的空间演化特征;2)数据变换:因变量的数据变换对变量之间的相关程度没有影响,自变量的等比例缩放不影响变量之间的相关程度,但极差正规化和极差标准化对变量之间的相关程度有微弱影响;3)最优趋势面判定及异常特征:以B矿层厚度等值线图为基础,结合趋势面的拟合度和F检验值的转折变化,判定3次多项式趋势面为最优趋势面(拟合度为77.39%,F检验值=39.11>F_(0.001)(7,87)≈3.94),相应B矿层厚度的正异常主要集中在英坪矿段的中部东侧;4)古地貌特征:最优趋势面趋势值的负值表征了晚陡山沱期英坪矿段为从西缘瓮福古岛向东逐渐变深的潟湖,北侧和南侧分别为谭家院水下高地和湾子半岛,远东方向可能受上塘—青平障壁岛限制;5)找矿预测:根据已有的岩相古地理研究成果和勘探工程资料,结合最优多项式趋势面特征,综合预测英坪矿段东侧具有寻找厚大B矿层磷块岩的较大潜力。研究表明,基于多项式趋势面分析在磷块岩矿床深部勘探中结果可靠,具有重要应用价值。Phosphorite is an important phosphate ore resource,and is mainly developed in the platform facies of continental margin.The thickness of phosphorite is stable and slowly changing in a certain spatial range.Therefore,the polynomial trend surface analysis method is very suitable to describe this spatial evolution characteristics.In this study data of 88 items associated with the B ore layer,which were not obviously disturbed by faults or uplift denudation,were collected from exploration projects of the Yingping oreblock Gaoping Mining area,Wengfu Phosphate Mine.Taking the thickness of the B ore layer as a dependent variable and the geographical coordinates of the exploration projects as independent variables,a demonstration study on the 1-5 orders polynomial trend surface analysis method applied in the exploration of sedimentary phosphate deposit in depth has been carried out.The main following results and understandings are obtained.1)Coordinate selection:Based om the spatial scale of exploration area,the coordinate simplification through the coordinate translation can highlight the spatial evolution characteristics of dependent variables;2)Data transversion:The data transversion of dependent variable and the proportional scaling of independent variable have no effect on the degree of correlation between variables,but the range normalization and range standardization have weak effect on the correlation between variables;3)Optimal trend surface discrimination and anomaly characteristics:Based on the contour map of B ore layer thickness,combined with the collaborative changes of goodness-of-fit and F-test value of the trend surface,the 3 order polynomial trend surface is determined to be the optimal trend surface(with the goodness-of-fit of 77.39%and F-test value(F)of 39.11 which is larger than F_(0.001)(7,87)(about 3.94),and the positive anomalies of the B ore layer thickness are mainly concentrated in the eastern central part of the Yingping oreblock.4)Palaeogeomorphic characteristics:The contour map of negative v

关 键 词：多项式趋势面分析 深部勘探 磷块岩 英坪矿段 瓮福磷矿 

分 类 号：P612[天文地球—矿床学]