南澳州曼纳希尔金矿勘查区土壤地球化学特征及S-Pb同位素分析  

Geochemical Characteristics and S-Pb Isotopes of Soils in the Mannahill Gold Exploration Area,South Australia

作　　者：董鹏[1,2] 孙传敏[1] 刘严松[1] 徐冠立[1] 谭伟 黄冠志[1,2] Jon Crowe 

机构地区：[1]成都理工大学地球科学学院,国土资源部构造成矿成藏重点实验室,成都610059 [2]成都地奥矿业能源有限公司,成都610041 [3]Panda Mining Pty Ltd.,Western Australia 6158

出　　处：《矿物岩石地球化学通报》2014年第6期862-867,共6页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国外矿产资源风险勘查专项(201130B02300130)

摘　　要：曼纳希尔金矿勘查区历史上开展的地质勘查工作有限,可利用的资料较少,矿权区内的找矿工作未见大的突破,矿床成因研究也鲜有涉及.为了对勘查区找矿潜力开展初步评价和对矿床成因方面有初步的认识,在区内开展了1∶10000土壤地球化学测量工作,并采集区内典型金多金属矿进行硫、铅同位素分析.结果在测区内圈定7个土壤地球化学综合异常区,经钻探工程验证,部分异常区的Au矿化段主要集中在距地表7～25 m范围;硫、铅同位素分析结果显示,5个方铅矿样品的δ34 SV-CDT范围15.0‰～17.6‰,具有富集重硫特征;5个方铅矿样品中的206 pb/204 Pb值为19.33～19.62,207 Pb/204 Pb值为15.79～15.85,208 Pb/204 Pb值为39.49～39.71,因而可认为矿权区内金多金属矿床的成矿热液主要来自大气降水,矿质来源于大陆风化产物及围岩,德雷里安造山期及以后的构造活动为金属元素的活化、转移、富集、沉淀提供了储矿空间条件及热源条件.Due to limited historical geological exploration work and few available researches,previous prospecting work in the Mannahill gold exploration area receive little progress and genetic study on deposit is barely documented.In order to obtain preliminary evaluation of prospecting potential and primary recognition of deposit genesis of the exploration area,this study carried out the soil geochemical survey （a scale at 1∶10000）,collected typical gold polymetallic ore samples,and analyzed sulfur and lead isotopes in the samples.The results showed there are seven soil geochemical comprehensive anomalous areas in the exploration area and gold mineralization sections occur mostly in the depth range of 7～25 m.On the basis of drilling in soil geochemical comprehensive anomalous areas and analytical results of sulfur and lead isotopes,the authors concluded that the metallogenic hydrothermal probably mainly came from meteoric water,the metallogenic materials were derived from the continental weathering products and wall rocks,and that the Delamerian orogeny and later structure activities provided ore-contained space and heat sources for remobilization,enrichment,precipitation of metal elements.

关 键 词：土壤地球化学 硫、铅同位素 南澳州 

分 类 号：P618.51[天文地球—矿床学] P597[天文地球—地质学]