The discovery of jasper rocks in the Qibaoshan cobalt-lead-zinc deposit in western Jiangxi Province and its restriction on the genesis of the deposit
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摘要:
对赣西七宝山钴铅锌矿中的碧玉岩进行岩石学、地球化学研究，可为矿床成因及区域海底火山活动成矿作用提供地质证据。赣西七宝山钴铅锌矿床为中型钴矿床，主矿体产于石炭系黄龙组铁白云岩中，矿石结构以粒状、胶状结构为主，块状、层纹状硫化物矿体与新发现的碧玉岩空间相依，同地产出，密切相伴，互相包夹，表明其与成矿具有密切的共生关系，属同期沉积产物；碧玉岩主量、微量、稀土数据表明，其具有高硅贫铝富铁、锰特征，Al/（Al+Fe+Mn）值为0.13~0.16，与热水成因的硅质岩相当；富集Rb、Ba、U、La、Zr、Hf元素，亏损K、Nd、P、Ti元素，U/Th值为185.83~373.85，Y/Ho值为26.88~50.00，稀土元素总量低，为0.88×10-6~2.16×10-6，LREE/HREE值介于0.07~0.36之间，轻、重稀土元素分馏程度不高，Ce无异常，δEu中等负异常，显示碧玉岩物质来源于深部海底热水，少量同生海水混合形成，形成于晚古生代陆缘裂谷海槽环境。研究成果为矿床属于海底火山喷流沉积成因提供了直接有利的证据。
Abstract:Qibaoshan Co-Pb-Zn deposit is a medium-sized cobalt ore deposit, the main ore body in carboniferous Huanglong Formation dolomite, ore structure is given priority to with granular, colloidal structure, block, layer striate sulfide ore bodies and newly discovered jasper rock spatial dependency, with output, close companions, sandwiched between each other, that with the mineralization has a close symbiosis, belong to the same period deposits; The main trace and rare earth data of the jasper rock show that it is characterized by high silicon, poor aluminum and rich in iron and manganese. The Al/(Al+Fe+Mn) ratio is 0.13~0.16, which is similar to the siliceous rocks of hydrothermal origin. Enrichment of Rb, Ba, U, La, Zr, Hf, depletion of K, Nd, P, Ti, U/Th ratio of 185.83~373.85, Y/Ho ratio of 26.88~50.00, ΣREE is low, ranging from 0.88×10-6~2.16×10-6. The LREE/HREE values range from 0.07 to 0.36, and the fractionation degree of light and light rare earth is not high. The Ce anomaly is not found, and the δEu moderate negative anomaly indicates that the jade rocks material originated from deep seabed hot water, and a small amount of syngenetic seawater was mixed and formed in the Late Paleozoic continental margin rift trough environment. Therefore, it provides direct and favorable evidence that the deposit belongs to the sedimentary origin of submarine volcanic effluents.
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Key words:
- Qibaoshan /
- Cobalt /
- jasper rocks /
- discovery /
- genesis /
- mineral exploration engineering
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图 2 标准化微量元素蛛网图(a)和稀土元素配分图(b) (标准化数值据Sun et al.，1989)
Figure 2.
图 3 Al-Fe-Mn图解(底图据Adachi et al., 1986)
Figure 3.
图 4 Al2O3/100-SiO2-Fe2O3/100-SiO2(a)和Al2O3/(Al2O3+Fe2O3)-Fe2O3/TiO2(b)图解(底图据Adachi et al.，1986)
Figure 4.
表 1 碧玉岩主量、微量及稀土元素分析结果
Table 1. The main, trace and rare earth element analysis results of jadeite rocks
送样号 QBS-YQ1 QBS-YQ2 QBS-YQ3 QBS-YQ4 QBS-YQ5 QBS-YQ1 QBS-YQ2 QBS-YQ3 QBS-YQ4 QBS-YQ5 SiO2 95.21 98.62 90.71 93.48 96.83 Cu 58.30 2.00 2.20 106.00 32.10 Al2O3 0.14 0.09 0.09 0.18 0.17 Pb 99.20 83.10 63.60 33.10 18.40 FeO 0.13 0.04 0.07 0.60 0.60 Zn 23.40 23.50 22.00 463.00 90.70 Fe2O3 0.55 0.45 0.35 0.58 0.47 Cr 21.30 2.00 3.90 20.60 16.50 CaO 1.18 0.34 0.39 1.71 0.73 Ni 2.30 0.67 0.76 32.90 20.30 MgO 0.75 0.22 0.24 0.85 0.35 Co 1.10 0.62 0.42 94.30 50.80 K2O 0.01 0.00 0.00 0.01 0.01 Rb 0.40 0.32 0.20 1.00 0.88 Na2O 0.04 0.04 0.04 0.05 0.04 Cs 0.42 0.39 0.39 0.52 0.51 TiO2 0.03 0.01 0.01 0.02 0.01 Bi 0.81 0.08 0.08 <0.05 0.05 P2O5 0.00 0.00 0.00 0.00 0.00 Hg 0.09 0.03 0.01 0.04 0.02 MnO 0.03 0.02 0.02 0.12 0.08 Sr 5.20 3.20 3.00 6.20 3.80 烧失量 1.87 0.53 8.48 2.41 1.00 Ba 2.80 2.70 2.80 3.30 4.20 SO2 0.02 0.01 0.02 0.23 0.09 V 3.20 1.40 1.40 9.20 7.50 Si 444313.33 460226.67 423313.33 436240.00 451873.33 Nb 0.18 0.04 0.02 0.21 0.14 Al 370.59 248.82 243.53 476.47 450.00 Ta < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 Fe 1909.36 1575.00 1225.00 2041.27 1656.27 Zr 12.30 11.90 92.70 12.10 12.30 Mn 216.90 123.94 131.69 929.58 627.46 Hf 0.70 0.60 2.20 0.50 0.50 Si/Al 1198.94 1849.61 1738.24 915.57 1004.16 Be 0.06 0.07 0.04 0.04 0.04 Fe2O3/SiO2 0.01 0.00 0.00 0.01 0.00 Ga 0.22 0.15 0.14 0.33 0.25 Al2O3/SiO2 0.00 0.00 0.00 0.00 0.00 Sn < 1.00 < 1.00 < 1.00 < 1.00 < 1.00 Fe2O3/100-SiO2 0.11 0.33 0.04 0.09 0.15 Au < 3.00 < 3.00 < 3.00 < 3.00 < 3.00 Al2O3/100-SiO2 0.03 0.07 0.01 0.03 0.05 Ag 0.42 0.07 0.09 0.09 0.05 Fe2O3/TiO2 17.60 34.62 25.00 29.16 47.32 U 17.30 30.60 22.30 24.60 24.30 Al2O3/(Fe2O3+Al2O3) 0.20 0.17 0.21 0.24 0.26 Th 0.06 0.12 0.12 0.09 0.07 Al/(Al+Fe+Mn) 0.15 0.13 0.15 0.14 0.16 U/Th 283.61 255.00 185.83 276.40 373.85 送样号 QBS-YQ1 QBS-YQ2 QBS-YQ3 QBS-YQ4 QBS-YQ5 TSK SW-1
(150 m)SW-2
(400 m)SW-3
(1502 m)SW-4
(2500 m)HW
(热水)La 0.22 0.20 0.18 0.50 0.33 2.07 1.44 2.54 4.96 5.37 161.88 Ce 0.42 0.38 0.38 0.70 0.70 3.17 0.79 0.35 0.65 0.61 336.82 Pr 0.04 0.06 0.04 0.08 0.07 0.50 0.22 0.33 0.62 0.72 43.35 Nd 0.20 0.19 0.16 0.36 0.30 1.89 1.14 1.65 2.98 3.41 177.22 Sm 0.05 0.05 0.04 0.14 0.09 0.40 0.27 0.33 0.59 0.66 43.00 Eu 0.01 0.01 0.01 0.02 0.01 0.08 0.07 0.09 0.16 0.19 210.06 Gd 0.05 0.05 0.03 0.15 0.10 0.51 0.40 0.53 0.90 1.06 42.48 Tb 0.01 0.01 0.00 0.02 0.01 0.12 0.07 0.09 0.17 0.18 5.60 Dy 0.04 0.02 0.01 0.10 0.06 0.58 0.50 0.71 1.22 1.37 29.03 Ho 0.01 0.00 0.00 0.02 0.01 0.13 0.14 0.20 0.35 0.38 4.70 Er 0.02 0.01 0.01 0.03 0.03 0.33 0.42 0.67 1.23 1.33 10.60 Tm 0.00 0.00 0.00 0.00 0.00 0.06 0.06 0.10 0.19 0.21 1.29 Yb 0.03 0.01 0.01 0.04 0.03 0.29 0.39 0.66 1.33 1.45 6.43 Lu 0.00 0.00 0.00 0.00 0.00 0.05 0.06 0.11 0.24 0.26 0.82 Y 0.20 0.21 0.11 0.43 0.31 4.61 7.84 10.77 19.20 21.14 141.98 Y/Ho 35.71 50.00 47.83 26.88 33.33 34.69 57.99 54.87 54.17 55.03 30.19 ΣREE 1.09 0.99 0.88 2.16 1.74 10.18 5.98 8.37 15.59 17.20 1073.28 LREE 0.94 0.89 0.81 1.80 1.50 8.11 3.94 5.30 9.96 10.96 972.33 HREE 0.15 0.11 0.07 0.36 0.24 2.07 2.04 3.07 5.63 6.24 100.95 LREE/HREE 6.45 8.36 11.50 5.01 6.20 3.92 1.94 1.73 1.77 1.76 9.63 (La/Yb)N 5.84 10.25 14.67 9.69 8.77 5.19 2.67 2.76 2.69 2.65 18.06 δEu 0.51 0.58 0.63 0.46 0.42 0.55 0.69 0.68 0.69 0.67 15.03 δCe 1.07 0.87 1.05 0.87 1.15 0.76 0.34 0.09 0.09 0.08 0.99 注：主量元素含量单位为%；微量、稀土元素含量单位为10-6。其中TSK数据为11个样品加权平均值，据参考文献Man et al.，2020；SW-1(150 m)、SW-2(400 m)、SW-3(1502 m)、SW-4(2500 m)数据据参考文献Alibo et al.，1999不同深度现代海水数据；HW(热水)数据据参考文献(Bau et al.，1999)中大西洋洋脊热液流体数据。δEu=EuN/0.5(SmN+GdN)；δCe=CeN/0.5(LaN+PrN) 
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