Metallogenic Age and Setting of Boka Gold Deposit Dongchuan: Evidence from Re-Os Isotope of Sulfide and Trace Element of Carbonaceous Slate
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摘要: 播卡金矿床位于扬子西缘“康滇地轴”中南段，其与东川因民-汤丹地区元古代“东川式”铜矿成矿作用具有显著差别而备受人们关注.该矿床富矿围岩为东川群黑色碳酸盐岩-碎屑岩地层，Au产出于石英-白云石硫化物脉中，具有明显辉绿岩岩浆萃取型Au矿蚀变特征，有别于韧性剪切带型Au矿.选取新山-马家沟矿段含金黄铁矿和围岩炭质板岩分别进行Re-Os同位素和微量元素研究.结果显示，黄铁矿Re-Os等时线年龄为779±14 Ma（MSWD=11.1），说明播卡金矿床成矿时代为新元古代.黄铁矿的Os初始比值为3.03±0.42，说明播卡金矿床金属成矿物质主要来源于地壳（围岩地层）而非辉绿岩岩浆，黄铁矿和炭质板岩微量中Au（平均为402.5.00×10-9和44.98×10-9）和Cu（平均为1 733.00×10-6和46.07×10-6）的含量远远大于克拉克值（约4×10-9和60×10-6），进一步证实成矿物质来源于围岩地层炭质板岩本身.东川播卡金矿成岩时代与该区新元古代岩浆岩相关的热液改造事件基本一致，表明成矿背景为该区新元古代岩浆/热液改造的成矿响应，该时期岩浆岩与富矿围岩热接触，同时萃取围岩地层中沉积预富聚的有利成矿元素，在良好的成矿空间内富集形成东川播卡金矿床.Abstract: The Boka gold deposit is located in the middle-south section of "Kangdian axis" in the western margin of Yangtze River. It is quite different from the "Dongchuan type" copper mineralization in the Yinmin-Tangdan area of Dongchuan. The rich wall rock of the deposit is black carbonate clastic rock stratum of Dongchuan group. Au occurs in quartz dolomite sulfide vein. It has obvious alteration characteristics of diabase magma extraction type Au deposit, which is different from ductile shear zone type Au deposit.In this paper, the Au-bearing pyrite and the wall rock carbonaceous slate in the Xinshan-Majiagou ore block were selected for Re-Os isotopic and trace element studies respectively. The results show that the Re-Os isochron age of pyrite is 779±14 Ma (MSWD=11.1), indicating that the Boka gold deposit was formed in Neoproterozoic. The initial Os ratio of pyrite is 3.03±0.42, indicating that the ore-forming materials of Boka gold deposit were mainly derived from the crust (wall rock strata) rather than diabase magma. The contents of Au (402.50×10-9and 44.98×10-9on average) and Cu (1 733.00×10-6 and 46.07×10-6 on average) in pyrite and carbonaceous slate are much higher than Clark values (about 4×10-9 and 60×10-6), which further confirms that the ore-forming materials were derived from the carbonaceous slate of the surrounding rock strata. The diagenetic age of Boka gold deposit in Dongchuan is basically consistent with the Neoproterozoic magmatic rock related hydrothermal transformation events, which indicates that the metallogenic background is the ore-forming response of Neoproterozoic magmatic/hydrothermal transformation in the area. During this period, the magmatic rock is in thermal contact with the ore rich wall rock, and the favorable ore-forming elements were extracted from the wall rock strata, The Boka gold deposit in Dongchuan was formed in a good metallogenic space.
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Key words:
- Boka gold deposit in Dongchuan /
- Re-Os isotope /
- metallogenic age /
- metallogenic dynamics /
- geochemistry
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图 1 华南新元古代岩浆岩分布图
据刘桂春等(2020)修改; 年龄数据引用Wang et al.(2016); Yang et al.(2016); Chen et al.(2017); “红框”为研究区
Fig. 1. Distribution of Neoproterozoic magmatic rocks in the South China block
图 2 中国西南康滇成矿带地质略图及Cu-Fe矿床分布(a, 据Chen and Zhou, 2012)和播卡Au矿新山-马家沟矿段地质图(b)
Fig. 2. Simiplified geological maps and the distributions of major Fe-Cu deposits of the Kangdian Fe-Cu province (a, modified after Chen and Zhou, 2012) and the geological map of Xinshan-Majiagou ore block from the Boka gold deposit(b)
图 3 东川播卡Au矿床5800勘探线剖面
Fig. 3. The profile of exploration line 5800 from the Boka gold deposit, Dongchuan
图 4 东川播卡Au矿床典型矿化、蚀变素描图
Fig. 4. The sketche of typical mineralization, alteration from the Boka gold deposit, Dongchuan
图 5 东川播卡Au矿床矿体构造-蚀变特征
a.灰白-灰色钠长岩旁侧或上部发育石英+白云石+黄铁+黄铜矿脉(1685中段2#穿脉); b, g.石英脉型黄铁矿+黄铜矿及镜下特征; c.块状黄铁矿+黄铜硫化物切穿围岩地层(1700中段北沿脉17356井口); d, h.块状黄铁矿+黄铜硫化物及镜下特征; e.黄铁矿化灰白-浅肉红色蚀变钠长岩与围岩地层接触(1700中段北沿脉17356井口); f.黄铁矿化灰白-浅肉红色蚀变钠长岩, 发育星点状黄铁+黄铜矿; Ccp.黄铜矿; Py.黄铁矿; Q.石英; S0.围岩地层产状
Fig. 5. The structural-alteration characteristics of ore body from the Boka gold deposit, Dongchuan
图 6 东川播卡Au矿床中黄铁矿Re-Os同位素等实线年龄
Fig. 6. The Re-Os isochron age of pyrite from the Boka gold deposit, Dongchuan
表 1 东川播卡Au矿床硫化物Re-Os同位素和微量样品特征
Table 1. The characteristics of Re-Os isotopie and trace elements of sulfide from the Boka gold deposit, Dongchuan
序号 样品编号 岩石名称 采样点 单矿物 测试和分析 1 180522-6 块状黄铁-黄铜矿 1700中段2#穿脉 细粒黄铁矿、黄铁矿 Re-Os同位素、微量 2 180522-5 块状黄铁-黄铜矿 1700中段北沿脉17356井口 细粒黄铁矿、黄铁矿 Re-Os同位素、微量 3 180522-7 石英脉型黄铁-黄铜矿 1685中段2#穿脉 细粒黄铁矿、黄铁矿 Re-Os同位素、微量 4 180522-12 块状黄铁-黄铜矿 1700中段北沿脉17356井口 细粒黄铁矿、黄铁矿 Re-Os同位素、微量 5 180522-13 黄铁矿化灰白-浅肉红色蚀变钠长岩 1700中段北沿脉17356井口 星点状黄铁矿、黄铁矿 Re-Os同位素、微量 
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表 2 东川播卡Au矿床炭质板岩Re-Os同位素和微量样品特征
Table 2. The characteristics of Re-Os isotopie and trace elements of carbonaceous slate from the Boka gold deposit, Dongchuan
序号 样品编号 岩石名称 采样点 样品类型 测试和分析 1 19HS-C-1 黑色炭质板岩 汤因线036县道公路旁, E102°57′23″ N26°16′27″ 全岩粉末样 微量 2 19HS-D-1 深黑色炭质页岩 汤因线036县道公路旁, E102°58′19″ N26°14′58″ 全岩粉末样 微量 3 19HS-G-1 深黑色炭质板岩 汤因线036县道公路旁的小道, E102°58′40″ N26°14′54″ 全岩粉末样 Re-Os同位素、微量 4 19HS2-A-1 黑色炭质千枚岩 大岩洞-岩坝塘沿江公路E102°58′46″ N26°28′52″ 全岩粉末样 Re-Os同位素、微量 5 XS-1655-1 黑色炭质板岩 播卡新山金矿1655中段(远离矿体) 全岩粉末样 Re-Os同位素、微量 6 XS-1670-1 黑色炭质板岩 播卡新山金矿1655中段(远离矿体) 全岩粉末样 Re-Os同位素、微量 7 XS-1655-KT01 黑色炭质板岩 播卡新山金矿1655中段(靠近矿体) 全岩粉末样 微量 8 XS-1655-KT02 黑色炭质板岩 播卡新山金矿1655中段(靠近矿体) 全岩粉末样 微量
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表 3 东川播卡Au矿床黄铁矿和炭质板岩Re-Os同位素数据
Table 3. The Re-Os isotopic data of pyrite and carbonaceous slate from the Boka gold deposit, Dongchuan
样品号 样重(g) Re(ng/g) 普Os(ng/g) 187Re (ng/g) 187Os (ng/g) 187Re/188Os 187Os/188Os Rho 测定值 不确定值 测定值 不确定值 测定值 不确定值 测定值 不确定值 测定值 不确定值 测定值 不确定值 计算值 180522-6 0.650 7 0.562 0.004 0.000 7 0.000 0 0.353 0.003 0.004 9 0.000 0 3 671 42 51.04 0.29 0.434 180522-5 0.650 8 0.904 0.007 0.001 4 0.000 0 0.568 0.004 0.008 0 0.000 1 3 064 31 43.20 0.08 0.108 180522-7 0.650 4 0.283 0.002 0.008 6 0.000 1 0.178 0.001 0.005 9 0.000 0 1 58.5 1.6 5.250 0.010 0.066 180522-12 0.650 4 0.906 0.007 0.001 8 0.000 0 0.569 0.004 0.008 1 0.000 1 2 411 25 34.34 0.10 0.198 180522-13 0.650 0 0.237 0.002 0.001 7 0.000 0 0.149 0.001 0.002 6 0.000 0 673.2 6.9 11.64 0.03 0.224 19HS-G-1 0.500 3 2.732 0.020 0.137 2 0.001 1 1.717 0.013 0.048 7 0.000 4 96.20 1.0 2.732 0.005 0.118 19HS2-A-1 0.500 3 0.237 0.002 0.029 3 0.000 2 0.149 0.001 0.006 1 0.000 1 39.00 0.4 1.584 0.013 0.067 XS-1655-1 0.500 8 2.416 0.018 0.088 0 0.000 7 1.519 0.011 0.038 0 0.000 3 132.6 1.4 3.319 0.009 0.236 XS-1670-1 0.500 2 3.080 0.023 0.1610 0.001 2 1.936 0.014 0.037 3 0.000 3 92.40 0.9 1.781 0.003 0.168
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表 4 东川播卡Au矿床黄铁矿、炭质板岩Au含量数据
Table 4. The Au content data of pyrite and carbonaceous slate from the Boka gold deposit, Dongchuan
序号 样品号 矿物、岩石 Au(10-9) Cu
(10-6)1 180522-6 黄铁矿 8.87 1 499.00 2 180522-5 黄铁矿 167.50 2 991.00 3 180522-7 黄铁矿 1 245.00 524.60 4 180522-12 黄铁矿 449.00 2 188.00 5 180522-13 黄铁矿 142.00 1 462.00 6 19HS-C-1 黑色炭质板岩(灰岩) 41.20 68.47 7 19HS-D-1 深黑色炭质页岩(板岩) 14.01 25.06 8 19HS-G-1 深黑色炭质板岩 39.82 8.79 9 19HS2-A-1 黑色炭质千枚岩 71.18 13.97 10 XS-1655-KT01 黑色炭质板岩 38.20 171.00 11 XS-1655-KT02 黑色炭质板岩 45.94 9.40 12 XS-1655-DK-1 黑色炭质板岩 56.10 20.88 13 XS-1670-1 黑色炭质板岩 53.42 50.96 克拉
克值- - 4.00 60.00
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