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Geochemical characteristics and anomaly evaluation in Daibu Town-Deze Town area, Yunnan Province |
Cheng-Zhong HE, Rui WU, Jun GUO, Zu-Jian ZOU, Quan-Heng LI, Yi-Qi MA |
Kunming Natural Resources Comprehensive Survey Center of China Geological Survey, Kunming 650000, China |
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Abstract Located along the Au-Pb-Zn-Cu-Fe-P-barite-coal-coal bedgas metallogenic belt in Qujing-Shilin fold thrust zone, the Daibu Town-Deze Town area of Yunnan Province is an important phosphorus, lead and zinc ore concentration area in Southwest China. Based on stream sediment geochemical Survey at the scale of 1∶50 000 in the Daibu Town-Deze Town area, the authors made comparison and analysis of geochemical characteristics of different formations, with the purpose of confirming the enrichment and dilution regularity and assemblage characteristics of regional elements. The study focused on the Xiaomiga No. HS-23-A1 geochemical anomaly of P-Pb-Zn-Mo and Tengziwa-Reshuicun No.HS-24-A1 geochemical anomaly of Pb-Zn-Au, and found the following phenomena: the HS-23-A1 anomaly is induced by the ore-hosting horizon of third member of Lower Cambrian Dengying Formation and Cambrian Qiongzhushi Formation;the HS-24-A1 anomaly is caused by lead-zinc veinlet,whereasthe Au anomaly is due to the secondary enrichment in the weathering crust.The Xiaomiga No. HS-23-A1 geochemical anomaly serves as a good prospecting target for deep orebodies.Two phosphorus orebodies were delineated, but the Tengziwa-Reshuicun No.HS-24-A1 geochemical anomaly of Pb-Zn-Au is relatively not ideal.Finally, the authors summarized the prospecting indicators of phosphate and lead-zinc deposits. The results obtained by the authors lay a foundation for further prospecting work.
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Received: 24 March 2019
Published: 22 April 2020
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4]; b—Geological map of study area 1—Quaternary; 2—Triassic; 3—Permian; 4—Carboniferous; 5—Devonian; 6—Cambrian; 7—Sinian to Cambrian; 8—Nanhuaan system; 9—Mesoproterozoic;10—Emeishan basalt;11—unconformities;12—conformities;13—faults ">
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Geotectonic location and geological map of study area a—Geotectonic location of study area[4]; b—Geological map of study area 1—Quaternary; 2—Triassic; 3—Permian; 4—Carboniferous; 5—Devonian; 6—Cambrian; 7—Sinian to Cambrian; 8—Nanhuaan system; 9—Mesoproterozoic;10—Emeishan basalt;11—unconformities;12—conformities;13—faults
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元素 | 剔除特异值 平均值(剩余 样数)(X) | 未剔除特 异值平均 值() | 中位数 (M) | 标准离 差(S) | 变化系 数(Cv) | 最大值 | 最小值 | 地壳克 拉克值 | 全国水 系沉积 物平均 含量 | 云南水 系沉积 物平均 含量 | 浓集克 拉克值 | 相对全 国富集 系数 | 相对云 南富集 系数 | Au | 3.33(8717) | 3.55 | 3.1 | 2.45 | 0.7 | 45 | 0.33 | 1.3 | 1.8 | 1.85 | 2.6 | 1.8 | 1.8 | Ag | 0.14(8057) | 0.22 | 0.14 | 0.36 | 1.6 | 6.4 | 0.038 | 0.056 | 0.086 | 0.094 | 2.6 | 1.7 | 1.5 | As | 12.80(8221) | 19.55 | 7.55 | 29.50 | 1.5 | 532 | 0.25 | 2.5 | 12 | 14.5 | 5.1 | 1.1 | 0.9 | Bi | 0.45(8782) | 0.47 | 0.38 | 0.30 | 0.6 | 5.65 | 0.025 | 0.18 | 0.39 | 0.39 | 2.5 | 1.2 | 1.2 | Hg | 0.10(8314) | 0.14 | 0.079 | 0.32 | 2.3 | 18.6 | 0.003 | 0.03 | 0.046 | 0.06 | 3.2 | 2.1 | 1.6 | Ni | 65.33(8734) | 67.63 | 64 | 28.05 | 0.4 | 355 | 5.3 | 59 | 26 | 41.3 | 1.1 | 2.5 | 1.6 | P | 1507(8443) | 2021 | 1539 | 3072 | 1.5 | 69558 | 128 | 436 | 615 | 720.19 | 3.5 | 2.5 | 2.1 | Pb | 34.80(8253) | 59.35 | 31.10 | 181.89 | 3.1 | 9427 | 8.2 | 11 | 27 | 30.5 | 3.2 | 1.3 | 1.1 | Sb | 1.38(8078) | 2.55 | 0.87 | 4.90 | 1.9 | 90 | 0.19 | 0.2 | 0.96 | 1.38 | 6.9 | 1.4 | 1.0 | Ti | 17805(8940) | 17816 | 17273 | 10298 | 0.6 | 50876 | 278 | 4200 | 4065 | 6215 | 4.2 | 4.4 | 2.9 | Zn | 144.63(8620) | 154.52 | 149 | 85.13 | 0.6 | 3085 | 7.5 | 72 | 71 | 86.2 | 2.0 | 2.0 | 1.7 | Al2O3 | 17.69(8856) | 17.64 | 17.61 | 3.98 | 0.2 | 32.83 | 0.68 | | 12.8 | 14.3 | | 1.4 | 1.2 | TFe2O3 | 12.75(8942) | 12.75 | 13.48 | 4.92 | 0.4 | 28.1 | 0.96 | | 4.5 | | | 2.8 | | Cd | 0.95(8345) | 1.34 | 0.8 | 2.82 | 2.1 | 176 | 0.05 | 0.08 | 0.18 | 0.201 | 11.9 | 5.3 | 4.7 | Co | 39.10(8881) | 39.68 | 36.4 | 20.52 | 0.5 | 204 | 1.28 | 27 | 12 | 19.5 | 1.4 | 3.3 | 2.0 | Cu | 141.51(8919) | 142.62 | 127 | 94.82 | 0.7 | 1266 | 4.34 | 27 | 23 | 41.1 | 5.2 | 6.2 | 3.4 | Mo | 1.60(8458) | 2.05 | 1.56 | 6.06 | 3.0 | 523 | 0.1 | 0.8 | 1 | 0.96 | 2.0 | 1.6 | 1.7 | U | 3.87(8381) | 4.58 | 3.46 | 3.96 | 0.9 | 97.8 | 0.5 | 1.3 | 2.7 | 3.22 | 3.0 | 1.4 | 1.2 | Ge | 1.60(8702) | 1.58 | 1.59 | 0.31 | 0.2 | 3.86 | 0.05 | 1.14 | | | 1.4 | | |
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Elements characteristic values of stream sediment in the study area (n=8 943)
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The spectrum map of element concentration and variation coefficient
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Element geochemical maps of the study area a—element geochemical map of Mercury; b—element geochemical map of Phosphorus; c—element geochemical map of Cobalt; d—element geochemical map of Lead
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Elements cluster analysis diagram of study area
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Anatomy of No. HS-23-A1 geochemical anomalies 1—Triassic; 2—upper Permian series; 3—middle Permian series; 4—Carboniferous; 5—Devonian; 6—Cambrian; 7—Sinian-Cambrian Dengying formation; 8—Sinian; 9—basic intrusive rock; 10—Phosphorus-bearing layer; 11—ore occurrences of Lead-Zinc; 12—fault structure;13—prospecting target area
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元素 | Ag | As | Hg | P | Pb | Sb | Zn | Cd | Mo | U | 单元素异常面积/km2 | 21.1 | 16.4 | 15.5 | 26.7 | 20.8 | 17.6 | 3.9 | 7.1 | 27.2 | 30.2 | 平均值/10-6 | 1.05 | 113.2 | 1.18 | 12140 | 259.34 | 17.65 | 327.66 | 6.36 | 10 | 15.68 | 最大值/10-6 | 5.5 | 506 | 18.6 | 56102 | 1360 | 79.1 | 3085 | 38.1 | 53.9 | 56.8 | 异常衬度 | 2.77 | 2.36 | 3.94 | 4.19 | 3.24 | 3.15 | 1.56 | 2.45 | 3.57 | 2.18 | 规模值 | 58.51 | 38.68 | 61.02 | 111.78 | 67.43 | 55.48 | 6.09 | 17.37 | 97.13 | 65.75 | 元素浓度分带 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 |
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Parameters of No. HS-23-A1 geochemical anomalies
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Anatomy of No. HS-24-A1 geochemical anomalies 1—diluvium of Quaternary; 2—third member upper Permian Emeishan basalt; 3—middle Permian upper Yangxin member; 4—middle Permian lower Yangxin member; 5—middle Permian Liangshan formation; 6—Carboniferous; 7—upper Devonian upper Zaige member; 8—upper Devonian lower Zaige member; 9—upper Devonian Haikou formation; 10—Cambrian; 11—Sinian-lower Cambrian Dengying formation;12—fault structure; 13—ore occurrences of Lead-Zinc;14—ore occurrences of Lead;15—prospecting target area
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元素 | Au | As | Bi | Pb | Zn | Cd | Mo | U | 单元素异常面积/km2 | 22.7 | 91.19 | 59.77 | 12.94 | 19.5 | 0.69 | 0.48 | 7.79 | 平均值 | 10.51 | 93.52 | 1.09 | 212.22 | 350.33 | 5.01 | 4.03 | 8.79 | 最大值 | 45 | 351 | 1.59 | 1400 | 2032 | 16.1 | 9.24 | 16.2 | 异常衬度 | 1.75 | 1.95 | 1.21 | 2.65 | 1.67 | 1.93 | 1.44 | 1.22 | 规模值 | 39.77 | 177.67 | 72.57 | 34.33 | 32.53 | 1.33 | 0.69 | 9.51 | 元素浓度分带 | 3 | 3 | 1 | 3 | 3 | 2 | 2 | 2 |
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Parameters of No. HS-24-A1 geochemical anomalies
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项目 | 磷矿 | 铅锌矿 | 含矿层位 | 震旦—寒武系灯影组上段上部 | 震旦—寒武系灯影组上段、筇竹寺组、泥盆系宰格组 | 岩石类型 | 由浅灰、灰黑色含磷白云岩,灰黄、浅灰色含磷粉砂岩、灰黑色硅质岩等组成的“含磷岩系” | 白云岩;砂岩、泥岩;宰格组灰岩 | 构造 | 主要产于背斜及背斜两翼 | NE向断裂—背斜(断褶带)与NW向、近EW向及近SN向断裂符合部位的一定范围内的次级背斜或羽状、陡倾断裂发育部位 | 化探异常总体特征 | 规模大、强度高、具有明显的方向性, 受含矿层位控制 | 规模大、强度高、元素重合性好,具有明显的方向性,受含矿层位和构造控制 | 主要指示元素组合 | P、Mo、U | Pb、Zn、Ag | 次要指示元素组合 | Pb、Zn、Ag、As、Sb、Hg、Cd | Sb、As、Bi、Cd、Hg、Cu | 电法 | 物性特征表现为低电阻、高激化率 | 物性特征表现为低电阻、高激化率 | 遥感线性构造 | 受地层控制的线性构造 | NW向构造与NE向构造交切区域 | 遥感蚀变信息 | 羟基蚀变 | 羟基蚀变为主 | 成矿作用 | 与沉积作用有关 | 主要以沉积或热液成矿为主 | 矿体产状 | 与地层产状一致 | 受NE向或近SN向次生羽状断裂控制 | 矿物组合 | 胶磷石、磷灰石 | 方铅矿、闪锌矿、铅钒、铅铁钒、矽钙铅矿、白铅矿等 | 围岩蚀变 | 硅化、碳质岩化、泥质岩化 | 地表出露的褐铁矿化、氧化铜矿化、氧化铅锌矿化,近矿围岩蚀变主要有黄铁矿化(褐铁矿化)、方解石化、硅化、重晶石化 |
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The prospecting criteria of Phosphate, Lead-Zinc ore in the study area
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