摘要
西秦岭拉日玛金矿床的赋矿岩系太阳顶群，以其高的有机质含量和伴生大量固体沥青而被认为矿化作用与石油烃类有关。根据红外光谱、色谱－质谱分析和反射率测定，揭示出含矿围岩不但是矿源层，而且是油源岩。它具有高的产烃指标和成熟度，有机质是海相菌藻成因的腐泥型。分离的干酪根和可溶有机质的中子沾化分析证实，矿源层中干酪根是金的主要载体，缺氧局限海中微生物及衍生有机质的吸收或吸附是金属元素初始富集的结果。
Taiyangdin Group as a host rock of Larima gold ore deposit is characterized by high amountsof orgsnic carbon (average 2. 32% )and associated with aboundant solid bitumens.It is proposed that gold mineralization was related to hydrocarbons in the history.Analysis of infrared spectra, GC-MSand reflectivity ocrfirms that the ore host rocks are not only medal source bed,but also comparable totypical oil source rocks.Its organic matter has high values of extracted bitumen and maturity(average5.5 %R0),which is of marine planktonic origin.The element contents from separated kerogens and soluble bitumen by neutron activition analysis show that most of gold in metal source bed is enriched in kerogens.Microoganisms and organic carbons absorption may result in preliminary enrichment of medalelements in euxinic, restricted sea basin.
出处
《成都理工学院学报》
CSCD
1994年第1期44-53,共10页
Journal of Chengdu University of Technology
基金
中国科学院有机地球化学开放实验室课题
关键词
金矿床
矿源层
微生物
有机质
金
gold deposit, metal source bed,hydrocarbon source rock, microorganism,preliminary enrichment
