海南岛抱伦金矿毒砂的成分特征及成矿温度
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摘要
为查明抱伦金矿金的赋存状态,在矿相学观察的基础上,开展毒砂成分电子探针微区测试。结果表明:毒砂中金质量分数高达0. 75%,但分布不均。Fe质量分数在30. 5%～36. 2%,As质量分数在39. 8%～48. 0%,S质量分数在16. 3%～22. 6%,As摩尔分数为29. 1%～34. 9%。金与其他元素无明显的相关性,说明晶格内的金对金含量影响甚微,金主要以包体的形式存在于毒砂中。毒砂形成条件为毒砂和磁黄铁矿组合与毒砂和斜方砷铁矿组合的相过渡条件下,成矿温度在350℃左右。该研究证实抱伦金矿属于中-高温热液矿床。
This paper describes electron probe microanalysis of arsenopyrite composition performed based on mineralogical observation so as to determine the occurrence of gold in Baolun gold deposit. The results show that arsenopyrite has the gold content of up to 0. 75%,but with uneven distribution; the mass fractions are 30. 5%-36. 2%,39. 8%-48. 0%,16. 3%-22. 6% and 29. 1%-34. 9% respectively for Fe,As,S and As; and the absence of an obvious correlation between gold and other elements indicates that the gold in the lattice has little influence on gold content,meaning that gold occurs in arsenopyrite mainly as inclusion; arsenopyrite forms at the mineralization temperature of about 350 ℃ during the phase transformation of arsenopyrite and pyrite assemblage and arsenopyrite and lollingite assemblage.The research confirms the Baolun gold deposit belongs to meso-hypothermal deposit.
This paper describes electron probe microanalysis of arsenopyrite composition performed based on mineralogical observation so as to determine the occurrence of gold in Baolun gold deposit. The results show that arsenopyrite has the gold content of up to 0. 75%,but with uneven distribution; the mass fractions are 30. 5%-36. 2%,39. 8%-48. 0%,16. 3%-22. 6% and 29. 1%-34. 9% respectively for Fe,As,S and As; and the absence of an obvious correlation between gold and other elements indicates that the gold in the lattice has little influence on gold content,meaning that gold occurs in arsenopyrite mainly as inclusion; arsenopyrite forms at the mineralization temperature of about 350 ℃ during the phase transformation of arsenopyrite and pyrite assemblage and arsenopyrite and lollingite assemblage.The research confirms the Baolun gold deposit belongs to meso-hypothermal deposit.
引文
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[14] Simon G,Huang H P,Hahn J E,et al. Oxidation state of goldand arsenic in gold-bearing arsenianpyrite[J]. American Miner-alogist,1999,84(1):1071-1079.
[15] Morey A A,Tomkins A G,Bierlein F P,et al. Biomodal distri-bution of gold in pyrite and arsenopyrite:examples from the Ar-chean Boorara and Bardoc shear systems,Yilgarn Craton,west-ern Australia[J]. Econ Geol,2008,103(1):599-614.
[2]舒斌,王平安,李中坚,等.海南抱伦金矿的成矿时代研究及其意义[J].现代地质,2004,18(3):316-320.
[3]刘玉琳,丁式江,张小文.海南乐东抱伦金矿床成矿时代研究[J].地质论评,2002,48(S1):84-87.
[4]陈柏林,丁式江,李中坚.海南抱伦金矿床成矿时代研究[J].地球化学,2001,30(6):525-532.
[5]丁式江,黄定香,李中坚.海南抱伦金矿地质特征及其成矿作用[J].中国地质,2001,28(5):28-34.
[6]谢才富,朱金初,丁式江,等.海南尖峰岭花岗岩体的形成时代、成因及其与抱伦金矿的关系[J].岩石学报,2006,22(10):2493-2508.
[7]舒斌,王平安,董法先,等.海南西南部抱伦金矿床流体包裹体及稳定同位素特征[J].地质通报,2006,25(7):880-893.
[8] Xu D R,Wang Z L,Wu C J,et al. Mesozoic gold mineralizationin Hainan Province of South China:Genetic types,geologicalcharacteristics and geodynamic settings[J]. Journal of Asian EarthSciences,2017,137(1):80-108.
[9] Cai J X,Wu C J,Xu D R,et al. Structural analysis of the Baolungold deposit,Hainan Island,South China:implications for metal-logeny[J]. Ore Geology Reviews,2017,89(1):253-269.
[10] Xu D R,Wang Z L,Cai J X,et al. Geological characteristics andmetallogenesis of the Shilu Fe-ore deposit in Hainan Province,South China[J]. Ore Geol Rev,2013,53(1):318-342.
[11]汪啸风,马大铨,蒋大海.海南岛地质:(三)构造地质[M].北京:地质出版社,1991:1-140.
[12]张小文,向华,钟增球,等.海南尖峰岭岩体热液锆石U-Pb定年及微量元素研究:对热液作用及抱伦金矿成矿时代的限定[J].中国地质大学学报,2009,34(6):921-930.
[13] Fleet M E,Chryssoulis S L,Mac Lean P J,et al. Arsenian pyritefrom gold deposits:Au and As distribution investigated by SIMSand EMP,and color staining and surface oxidation by XPS andLIMS[J]. Canadian Mineralogist,1993,31(1):1-17.
[14] Simon G,Huang H P,Hahn J E,et al. Oxidation state of goldand arsenic in gold-bearing arsenianpyrite[J]. American Miner-alogist,1999,84(1):1071-1079.
[15] Morey A A,Tomkins A G,Bierlein F P,et al. Biomodal distri-bution of gold in pyrite and arsenopyrite:examples from the Ar-chean Boorara and Bardoc shear systems,Yilgarn Craton,west-ern Australia[J]. Econ Geol,2008,103(1):599-614.