GEOCHEMICAL CHARACTERISTICS OF 1:50 000 STREAM SEDIMENT SURVEY AND PROSPECTING PREDICTION IN MENGHAI AREA, YUNNAN PROVINCE
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摘要:
勐海地区处于临沧-勐海(岩浆弧)Fe-Pb-Zn-Au-Ag-Sn-Sb-Ge-REE矿带, 具有较好的找矿前景. 在勐海地区1:5万水系沉积物测量基础上, 对区内29种元素分布特征、元素相关性、地球化学参数特征研究, 圈定了5个组合异常和13个综合异常. 其中, Ce-La-Y-Zr综合异常具有较好找矿前景; Au、As、Sb、Hg、W、P等元素离散程度较高, 元素局部较富集, 具有成矿的可能性. 结合水系沉积物测量成果, 圈定找矿远景区2处, 为下一步找矿工作提供了地球化学依据.
Abstract:Menghai area is located in Lincang-Menghai (magmatic arc) Fe-Pb-Zn-Au-Ag-Sn-Sb-Ge-REE metallogenic belt, with a good prospecting potential. Based on the regional 1:50 000 stream sediment survey, the distribution characteristics, element correlation and geochemical parameter characteristics of 29 elements are studied, and 5 composite anomalies and 13 comprehensive anomalies are delineated in the area. Among them, the Ce-La-Y-Zr comprehensive anomaly has a good prospecting potential. The elements of Au, As, Sb, Hg, W and P are highly dispersed and locally enriched, with possibility of mineralization. Combined with the stream sediment survey results, 2 prospecting potential areas are delineated, which may provide geochemical basis for the next prospecting work.
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Key words:
- stream sediment /
- geochemical anomaly /
- rare earth element /
- Yunnan Province
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表 1 元素变异系数及标准离差特征
Table 1. Element variation coefficients and standard deviation characteristics
元素 S1 S2 S1/S2 CV1 CV2 CV1/CV2 Ag 63.27 21.09 3.00 0.94 0.36 2.60 As 8.85 3.95 2.24 1.14 0.65 1.76 Au 1.19 0.43 2.74 1.24 0.55 2.28 Be 0.80 0.64 1.25 0.51 0.43 1.19 Bi 0.33 0.19 1.78 0.82 0.53 1.55 Cd 0.13 0.03 3.85 1.54 0.50 3.09 Ce 33.96 28.49 1.19 0.59 0.52 1.14 Co 5.27 4.08 1.29 0.63 0.52 1.21 Cr 24.58 22.70 1.08 0.47 0.44 1.06 Cu 9.71 8.15 1.19 0.75 0.67 1.12 F 138.27 127.56 1.08 0.39 0.36 1.06 Ga 7.78 7.74 1.01 0.62 0.62 1.00 Ge 0.23 0.22 1.03 0.20 0.20 1.02 Hg 33.52 15.03 2.23 1.27 0.69 1.85 La 15.96 13.23 1.21 0.58 0.50 1.16 Li 8.66 6.79 1.27 0.54 0.46 1.18 Mo 0.47 0.29 1.63 0.79 0.56 1.43 Nb 5.02 4.67 1.07 0.50 0.47 1.05 Ni 12.39 11.28 1.10 0.76 0.72 1.06 P 445.51 184.69 2.41 1.05 0.49 2.13 Pb 20.01 14.32 1.40 0.74 0.56 1.32 Rb 51.00 48.36 1.05 0.43 0.41 1.04 Sb 0.53 0.24 2.19 1.02 0.54 1.88 Sn 3.33 2.05 1.63 0.86 0.62 1.39 Ta 0.48 0.41 1.18 0.51 0.45 1.13 W 2.28 0.96 2.38 1.05 0.53 1.98 Y 9.94 8.26 1.20 0.52 0.45 1.17 Zn 32.93 23.83 1.38 0.76 0.59 1.29 Zr 89.49 77.89 1.15 0.52 0.47 1.11 注：S1、CV1为原始数据标准离差和变异系数；S2、CV2为剔除高值和低值后标准离差和变异系数. 
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表 2 因子解释总方差及元素组合特征
Table 2. Total variance interpreted by factors and element combination characteristics
因子 初始特征值 元素组合特征 特征值 方差/% 累积/% 主要因子结构式 属性推断 F1 13.64 47.04 47.04 Be0.76 Bi0.58 Ce0.84 Co0.68 Cr0.88 Cu0.83 F0.78 Ga0.94 Ge0.80 La0.83 Li0.79 Mo0.62 Nb0.90 Ni0.89 Pb0.61 Rb0.50 Sn0.70 Ta0.81 Y0.77 Zn0.73 Zr0.70 稀有、稀土、稀散元素 F2 2.26 7.78 54.83 Ag0.58 Au0.52 F3 1.90 6.55 61.38 Cd0.60 Zn0.52 F4 1.47 5.08 66.46 Pb0.53
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表 3 综合异常分类
Table 3. Classification of comprehensive anomalies
异常编号 主要成矿元素 异常分类 面积/km2 ∑NAP HS-3 Ce-Y-Zr-Au-Bi-W-Ta-Sn-Sb-Ga-Au-Nb 甲1 22.31 222.268 HS-7 Ce-La-Y-Zr-Li-F-Co-Ga-Zn-Ge-Cu-Ni 丙2 24.11 180.499 HS-1 Ce-La-Y-Zr-Ag-Bi-Cu-Pb-Zn 丙1 12.50 63.537 HS-2 Y-Zr-Ag-Hg-Mo-Cr-Cu-Ga-Ni 乙3 3.36 38.042 HS-6 Ce-La-Y-Zr-F-Li-Co-Cu-Ga-Ge 乙3 13.75 32.939 HS-5 W-Ag-Bi-Pb 丙2 3.50 28.225 HS-9 Ce-La-Y-Rb-Pb-Bi-Be 乙1 4.41 27.068 HS-11 Ce-La-Y-W-Bi-Be-Ta-Sn-Pb 丙1 2.60 25.821 HS-10 Ce-La-Zr-W-Ta 乙3 6.64 24.197 HS-4 Ce-Zr-Sn-Bi-Ta-Hg-Ga-Nb 乙3 2.72 21.871 HS-13 Ce-La-Y-Zr-Sb-Ta-Sn 乙3 2.42 15.272 HS-8 Rb-Pb-Sn-Be-Bi-F 丙1 3.62 14.33 HS-12 Ce-La-Rb-Be-Bi-Ta 丙1 1.53 11.172
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表 4 HS-9乙1综合异常特征
Table 4. Characteristics of HS-9-B1 comprehensive anomaly
元素 点数 面积/km2 极大值 平均值 衬度 规模 浓度分带 Ce-9 11 2.60 189 128.48 1.61 126.22 2 La-5 10 2.72 102 70.65 1.77 83.26 2 Y-13 10 2.28 59.3 39.5 1.58 33.07 2 Rb-4 11 3.22 306 228.18 1.27 154.94 1 Pb-6 9 2.69 102 64.43 1.43 52.33 2 Bi-10 7 1.66 1.75 1.16 1.70 0.79 2 Be-2 7 1.65 5.61 3.69 1.45 1.88 2 元素含量单位：10－6.
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