3D geological modeling technology for super-large concealed Daotuo manganese deposit in Guizhou based on synergistic constraints from multi-source heterogeneous data
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摘要:目的
深部隐伏锰矿三维地质建模普遍存在多源勘查数据融合程度低、多类信息协同约束机制缺失、超薄层状矿体精细刻画难度大等问题。贵州道坨为超大型全隐伏喷溢沉积型锰矿床,矿体埋深大、厚度薄、成矿地质结构复杂,传统二维图件难以反映矿体真实三维赋存状态。以该矿床为研究对象,融合数字高程模型(DEM)、地质填图、钻探编录、勘查线剖面、遥感影像、音频大地电磁测深(AMT)多源异构勘查数据,构建地表−地层−构造−矿体一体化三维地质模型,为深部隐伏锰矿数字化勘查与资源定量评价提供技术支撑。
方法建立多源异构数据标准化处理、三重一致性校验、多源信息协同约束、超薄矿体增量模拟的完整技术流程;划分 18 个地质建模单元,采用曲面拟合、拓扑推理、克里金插值完成地质体实体构建;结合 67 个钻孔、722 件有效品位样品开展品位归一化预处理,实施模型剖面解析、虚拟钻孔分析、模型拆解,基于地质统计学块体克里金法开展资源−储量估算。
结果该模型完整复现研究区−
2000 m 至地表的三维地质空间结构,清晰揭示南华系大塘坡组含锰岩系、F3 浅表正断层与缓倾斜层状锰矿体的空间展布规律;经多源数据一致性校验,数据源综合合格率达 97.2%;地质统计学估算结果与传统块段法资源量误差仅 0.9%,锰平均品位误差 0.31%,可有效校验原始勘查数据可靠性,厘清构造与矿体的空间耦合关系。结论多源异构数据协同约束建模技术能够有效解决超薄隐伏矿体建模失真难题,显著提高深部找矿工程部署与矿产资源评价精度;形成的成套技术范式,可为黔东乃至扬子地区大塘坡式隐伏锰矿深部找矿突破与矿山数字化建设提供参考。
Abstract:ObjectiveDeep concealed mineral exploration is a critical direction for implementing China’s new-round prospecting breakthrough strategy and securing domestic mineral resource supply. Nevertheless, three-dimensional (3D) geological modeling for deep concealed manganese deposits still faces prominent bottlenecks: low integration of multi-source exploration datasets, insufficient synergistic constraint mechanisms among multi-type geological information, and technical obstacles for fine characterization of ultra-thin stratiform ore bodies. The Daotuo deposit in Guizhou represents a typical super-large fully concealed exhalative-sedimentary manganese deposit of the Datangpo-type within the Yangtze Block. It is characterized by great burial depth, ultra-thin ore bodies, and complicated geological architectures, which cannot be adequately depicted by conventional two-dimensional geological maps. This study aims to construct an integrated 3D geological model of surface–strata–structure–ore body constrained by multi-source heterogeneous data, so as to provide technical support for digital exploration and quantitative resource assessment of deep concealed manganese ore bodies.
MethodsMulti-source heterogeneous datasets including a digital elevation model (DEM), geological mapping results, drilling logs, exploration profile data, remote sensing imagery, and audio magnetotelluric (AMT) sounding data were comprehensively integrated. A complete technical workflow was established, covering standardized multi-source data preprocessing, three-fold consistency verification, multi-information synergistic constraint, and incremental simulation for ultra-thin ore bodies. A total of 18 geological modeling units were delineated. Surface fitting, topological reasoning, and Kriging interpolation were adopted to construct solid geological bodies. Based on 67 boreholes and 971 grade samples, 722 valid samples were retained after outlier elimination and grade normalization via log-Z-score transformation. The normalized samples passed the Shapiro-Wilk normality test. Model cross-section interpretation, virtual borehole analysis, and model decomposition were implemented, and the block Kriging geostatistical method was applied for resource–reserve calculation.
ResultsThe established model fully reconstructed the 3D geological structure of the study area from the ground surface down to −2 000 m elevation, and clearly revealed the spatial distribution of the manganese-bearing rock series of Nanhua Series Datangpo Formation, the shallow F3 normal fault, and the gently dipping stratiform manganese ore bodies. After three-fold multi-source consistency verification, the comprehensive qualification rate of the data sources reached 97.2 %. Geostatistical resource estimation showed only 0.9 % relative discrepancy compared with the traditional block-segment method, and the error of average manganese grade was merely 0.31 %. Modeling results confirmed that the F3 fault only affected shallow strata and did not damage deep manganese ore bodies. The integrated model could effectively validate the reliability of original exploration data and clarify the spatial coupling relationships between geological structures and ore bodies.
ConclusionThe modeling technique based on synergistic constraints from multi-source heterogeneous data can effectively solve the problem of distortion frequently encountered in modeling ultra-thin concealed ore bodies, and significantly improve the precision of deep-prospecting engineering deployment and mineral resource evaluation. The formed complete technical paradigm can provide references for deep prospecting breakthroughs of Datangpo-type concealed manganese deposits and mine digital construction in eastern Guizhou and even the broader Yangtze Block.
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表 1 锰品位预处理前后统计特征
Table 1. Statistical characteristics of manganese grade before and after preprocessing
数据分组 有效样品
数/件均值/% 标准
差/%偏度 峰度 Shapiro-
Wilk P值原始全部样品 971 16.741 7.391 0.153 1.770 0.000 数据剔除后原始样品 722 20.175 5.149 −0.210 2.203 0.000 对数-Zscore归一化样品 722 0 1 0.138 2.701 0.062 注:Shapiro-Wilk检验显著性水平α=0.05,P>0.05认为数据服从正态分布。 表 2 多源数据一致性校验量化结果
Table 2. Quantitative results of multi-source data consistency validation
校验类型 校验样本 偏差评价指标 平均偏差 地表地质界线与
DEM匹配校验12 km2填图区
与22条界线平面坐标
偏差≤2 m1.12 钻探分层与AMT反演
界面深度对比校验2条AMT剖面与
67个钻孔矿层界面高程与地层
深度偏差≤5 m2.87 相邻勘查线剖面间地层
与矿体空间交叉验证10条勘探剖面与18组
地层−矿体对比单元地层厚度
相对偏差≤3%1.64 注:AMT为音频大地电磁测深;DEM为数字高程模型;下同。 表 3 道坨锰矿床建模单元
Table 3. Modeling units of Daotuo manganese deposit
名称 代号 厚度范围/m 主要特性 地层建模单元 第四系 Q 0~36.75 地表腐植土、黏土、粉质黏土、砂、砾等 清虚洞组二段 ∈2q2 108.56~180.56 浅灰色、灰色块状泥粉晶灰岩等 清虚洞组一段 ∈2q1 16.54~53.95 灰色、深灰色薄层条带状泥粉晶灰岩夹深色中层泥粉晶灰岩等 杷榔组 ∈2p 206.91~470.88 深灰色薄层粉砂质页岩偶夹灰白色薄层粉砂岩,上部含钙质扁豆体,
地表多溶蚀空洞,底部为黑色碳质页岩变马冲组二段 ∈2b2 133.65~357.18 灰、深灰色薄−厚层砂岩、粉砂岩、石英砂岩夹黑色碳质页岩 变马冲组一段 ∈2b2 1.44~75.04 黑色碳质页岩、碳质黏土岩间夹粉砂质页岩 九门冲组 ∈2jm 16.48~81.83 下部为灰黑色薄至中层含碳质泥粉−细晶灰岩与黑色碳质页岩互层,
上部为灰色中厚层细晶灰岩间夹黑色碳质页岩,灰岩中方解石细脉发育牛蹄塘组 ∈₁₋2n 8.11~47.10 下部为黑色碳质页岩(含镍、钼、钒多金属),底部偶见豆状磷质结核,
上部为灰黑色含碳质的粉砂质页岩老堡组 Z∈l 0.35~19.70 灰黑色薄层状硅质岩夹黑色碳质页岩,顶部见少量黑色豆状磷质结核 陡山坨组 Z₁d 19.43~63.72 灰、深灰色薄层−厚层块状泥粉−细晶白云岩,间夹灰色薄层黏土岩及
灰黑色粉砂质碳质页岩,局部可见硅化、方解石化等南沱组 Nh₃n 170.52~280.93 灰、深灰色块状含砾粉砂岩、含砾黏土岩、黏土岩,分选性差,间夹
灰绿、黄灰色粉砂质黏土岩,中下部偶见灰色透镜状白云岩大塘坡组二段 Nh2d2 108.22~312.15 灰黑色、深灰色含碳质粉砂质页岩等 大塘坡组一段 Nh2d1 6.51~68.63 “含锰岩系”,全隐伏地下,岩性为灰黑色、钢灰色条带状等菱锰矿夹黑色碳质页岩等 铁丝坳组 Nh2t 10.65~32.09 深灰色块状含砾杂砂岩,偶夹黑色薄层含锰碳质页岩,砾石成分杂、分选性差,星点状黄铁矿发育 两界河组 Nh2l 21.69~67.71 上部为灰色、灰绿色厚层−块状长石岩屑杂砂岩等,下部为灰褐色、
浅灰绿色中厚层−块状含砾砂质黏土岩等清水江组 Qbq >75.99 灰、灰绿色中−厚层变质粉砂岩、变质砂岩等 矿体建模单元 锰矿体 Mn 0.87~11.75 菱锰矿,伴生星点状、断线状黄铁矿,局部见石英、方解石细脉穿插 断层 F3 — 走向NE,倾向SE,倾角58°~62°,断距小于50 m,上盘相对下降,正断层
性质,发育劈理化带,仅影响浅表地层,未破坏深部锰矿体表 4 道坨锰矿资源量估算结果对比
Table 4. Comparison of resource estimation results for Daotuo manganese deposit
资源量类别 误差率/% 相似率/% dn平均品位误差/% 探明资源量 0.70 99.30 0.14 控制资源量 0.62 99.38 0.26 推断资源量 1.20 98.80 0.43 整体 0.90 99.10 0.31 注:本表为地质统计学法与地质块段法资源量估算结果对比。 -
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