云南保山金厂河铁铜铅锌多金属矿床S-Pb同位素特征
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摘要
滇西金厂河铁铜铅锌多金属矿床位于云南省保山地块北部、NS向保山—施甸复背斜与NNW向澜沧江断裂的锐角交汇部位的南部。文章在以往工作的基础上,研究金厂河铁铜铅锌多金属矿床的S-Pb同位素特征,这对分析该矿床成矿物质来源及探究成矿过程具有十分重要的意义。采样及测试结果显示,该矿床硫化物的δ~(34)S值为+2.5‰～+11.1‰,平均+5.65‰,说明矿床硫化物硫的来源为深部幔源岩浆硫和混合硫(复杂硫);共生含硫矿物中富集δ~(34)S的均值为:黄铜矿(+5.65‰)>闪锌矿(+5.38‰)>方铅矿(+3.45‰),表明矿床硫同位素分馏未达到平衡。~(207)Pb/~(204)Pb—~(206)Pb/~(204)Pb、~(208)Pb/~(204)Pb—~(206)Pb/~(204)Pb铅同位素模式图中样品点分布位置及朱炳泉Δβ—Δγ变化范围图解结果表明,该矿床铅同位素主要来源于上地壳,此外和深部岩浆的侵入活动相关。
The Jinchanghe iron-copper-lead-zinc polymetallic deposit in western Yunnan Province is located in the north of Baoshan block and the south of the sharp intersection of NS-trending BaoshanShidian abdominal anticline and NNW-trending Lancang River fault.On the basis of previous work,the S-Pb isotope characteristics of Jinchanghe iron-copper-lead-zinc polymetallic deposit are studied,which is of great significance for analyzing the source of ore-forming materials and exploring the metallogenic process of the deposit.Sampling and testing results show that the sulfide value δ34S of the deposit is+2.5‰～+11.1‰,with an average of+5.65‰,indicating that the sulfide source of the deposit is deep mantle-derived magmatic sulfur and mixed sulfur(complex sulfur);the average value of enriched Delta 34S in symbiotic sulfur-bearing minerals is chalcopyrite(+5.65‰)>sphalerite(+5.38‰)>galena(+3.45‰),indicating that the sulfur isotope fractionation of the deposit is not up to balance.The distribution of sample points in~(207)Pb/~(20)4Pb～~(206)Pb/~(204)Pb,~(208)Pb/~(204)Pb～~(206)Pb/~(204)Pb lead isotope pattern and the variation range of Zhu Bingquan Δβ-Δγ show that the lead isotopes of the deposit mainly originate from the upper crust and are related to the intrusion of deep magma.
The Jinchanghe iron-copper-lead-zinc polymetallic deposit in western Yunnan Province is located in the north of Baoshan block and the south of the sharp intersection of NS-trending BaoshanShidian abdominal anticline and NNW-trending Lancang River fault.On the basis of previous work,the S-Pb isotope characteristics of Jinchanghe iron-copper-lead-zinc polymetallic deposit are studied,which is of great significance for analyzing the source of ore-forming materials and exploring the metallogenic process of the deposit.Sampling and testing results show that the sulfide value δ34S of the deposit is+2.5‰～+11.1‰,with an average of+5.65‰,indicating that the sulfide source of the deposit is deep mantle-derived magmatic sulfur and mixed sulfur(complex sulfur);the average value of enriched Delta 34S in symbiotic sulfur-bearing minerals is chalcopyrite(+5.65‰)>sphalerite(+5.38‰)>galena(+3.45‰),indicating that the sulfur isotope fractionation of the deposit is not up to balance.The distribution of sample points in~(207)Pb/~(20)4Pb～~(206)Pb/~(204)Pb,~(208)Pb/~(204)Pb～~(206)Pb/~(204)Pb lead isotope pattern and the variation range of Zhu Bingquan Δβ-Δγ show that the lead isotopes of the deposit mainly originate from the upper crust and are related to the intrusion of deep magma.
引文
[1]符德贵,崔子良,官德任.保山金厂河铜多金属隐伏矿综合找矿[J].云南地质,2004,23(2):188-198.FU Degui,CUI Ziliang,GUAN Deren.The comprehensive oreprospecting of Jinchanghe blind multimetallic deposit,Baoshan[J].Yunnan Geology,2004,23(2):188-198.(in Chinese with English abstract)
[2]薛传东,韩润生,杨海林,等.滇西北保山核桃坪铅锌矿床成矿流体来源的同位素地球化学证据[J].矿床地质,2008,27(2):243-252.XUE Chuandong,HAN Runsheng,YANG Hailin,et al.Isotope geochemical evidence for ore-forming fluid resources in Hetaoping Pb-Zn deposit,Baoshan,northwestern Yunnan[J].Mineral Deposits,2008,27(2):243-252.(in Chinese with English abstract)
[3]陶琰,胡瑞忠,朱飞霖,等.云南保山核桃坪铅锌矿成矿年龄及动力学背景分析[J].岩石学报,2010,26(6):1760-1772.TAO Yan,HU Ruizhong,ZHU Feilin,et al.Ore-forming age and the geodynamic background of the Hetanping lead-zinc deposit in Baoshan,Yunnan[J].Acta Petrologica Sinica,2010,26(6):1760-1772.(in Chinese with English abstract)
[4]CHAUSSIDON M,LORAND J P.Sulphur isotope composition of orogenic spinel lherzolite massifs from Ariege(North-Eastern Pyrenees,France):An ion microprobe study[J].Geochimica et Cosmochimica Acta,1990,54(10):2835-2846.
[5]HOEFS J.Stable isotope geochemistry[M].7th ed.Berlin:Springer-Verlag,2015:1-389.
[6]郑永飞,陈江峰.稳定同位素地球化学[M].北京:科学出版社,2000:1-247.ZHENG Yongfei,CHEN Jiangfeng.Stable isotopic geochemistry[M].Beijing:Science Press,2000:1-247.(in Chinese)
[7]伍俊杰,陈正乐,付蕾,等.江西新余良山钼矿氢-氧-硫-铅同位素特征及指示意义[J].地质力学学报,2016,22(2):325-337.WU Junjie,CHEN Zhengle,FU Lei,et al.H-O-S-Pb isotopic components of the Liangshan molybdenum deposit in Xinyu,Jiangxi province and their implications for the ore forming process[J].Journal of Geomechanics,2016,22(2):325-337.(in Chinese with English abstract)
[8]朱炳泉.地球科学中同位素体系理论与应用:兼论中国大陆壳幔演化[M].北京:科学出版社,1998:224-246.ZHU Bingquan.Theory and application of isotopic system in the earth science[M].Beijing:Science Press,1998:224-246.(in Chinese)
[2]薛传东,韩润生,杨海林,等.滇西北保山核桃坪铅锌矿床成矿流体来源的同位素地球化学证据[J].矿床地质,2008,27(2):243-252.XUE Chuandong,HAN Runsheng,YANG Hailin,et al.Isotope geochemical evidence for ore-forming fluid resources in Hetaoping Pb-Zn deposit,Baoshan,northwestern Yunnan[J].Mineral Deposits,2008,27(2):243-252.(in Chinese with English abstract)
[3]陶琰,胡瑞忠,朱飞霖,等.云南保山核桃坪铅锌矿成矿年龄及动力学背景分析[J].岩石学报,2010,26(6):1760-1772.TAO Yan,HU Ruizhong,ZHU Feilin,et al.Ore-forming age and the geodynamic background of the Hetanping lead-zinc deposit in Baoshan,Yunnan[J].Acta Petrologica Sinica,2010,26(6):1760-1772.(in Chinese with English abstract)
[4]CHAUSSIDON M,LORAND J P.Sulphur isotope composition of orogenic spinel lherzolite massifs from Ariege(North-Eastern Pyrenees,France):An ion microprobe study[J].Geochimica et Cosmochimica Acta,1990,54(10):2835-2846.
[5]HOEFS J.Stable isotope geochemistry[M].7th ed.Berlin:Springer-Verlag,2015:1-389.
[6]郑永飞,陈江峰.稳定同位素地球化学[M].北京:科学出版社,2000:1-247.ZHENG Yongfei,CHEN Jiangfeng.Stable isotopic geochemistry[M].Beijing:Science Press,2000:1-247.(in Chinese)
[7]伍俊杰,陈正乐,付蕾,等.江西新余良山钼矿氢-氧-硫-铅同位素特征及指示意义[J].地质力学学报,2016,22(2):325-337.WU Junjie,CHEN Zhengle,FU Lei,et al.H-O-S-Pb isotopic components of the Liangshan molybdenum deposit in Xinyu,Jiangxi province and their implications for the ore forming process[J].Journal of Geomechanics,2016,22(2):325-337.(in Chinese with English abstract)
[8]朱炳泉.地球科学中同位素体系理论与应用:兼论中国大陆壳幔演化[M].北京:科学出版社,1998:224-246.ZHU Bingquan.Theory and application of isotopic system in the earth science[M].Beijing:Science Press,1998:224-246.(in Chinese)