: By means of kerogen purification, the proton induced X-ray emission (PIXE) and instrumental neutron activation analysis (INAA), the authors have studied the organic/inorganic occurrence modes of the metallic element...: By means of kerogen purification, the proton induced X-ray emission (PIXE) and instrumental neutron activation analysis (INAA), the authors have studied the organic/inorganic occurrence modes of the metallic elements of the Baiguoyuan silver-vanadium deposit hosted in black shale in Hubei Province, China. The result shows that Au, Hg and Ta have a strong tendency to occur organically, with more than 70% of these elements being associated organically. Se, Ga, Ag and Hf are partly associated with organic matter, with more than 20% of them occurring organically. Compared with the above elements, Zn, Cu, As and Sb are weakly associated organically, and tend to be enriched in kerogen. However, Mn, Th, U, V, Co, Cr, AI, Fe and Sc usually occur inorganically. Of the rare earth elements (REE), La, Ce, Tb, Dy, Yb and Lu have stronger ability to be associated with organic matter than Sm and Eu.展开更多
Baiguoyuan silver-vanadium deposit is generally thought to be of sedimentary-diagenetic origin. Based on the characteristics of barites, it is suggested that hydrothermal transformation has been involved in mineraliza...Baiguoyuan silver-vanadium deposit is generally thought to be of sedimentary-diagenetic origin. Based on the characteristics of barites, it is suggested that hydrothermal transformation has been involved in mineralization. The barites in black shale can be grouped into irregular ones which were formed during early diagenesis and tabular ones which were formed during late diagenesis. The tabular barites are replaced by pyrite and have formed a regular girdle around them. PIXE analysis states that Ag is greatly concentrated in pyrite replacement girdle. The girdle is the product of hydrothermal transformation. The transformation is one of the main mineralization stages of Baiguoyuan deposit.展开更多
A novel heterometallic V2Ag2S4 thiocubane cluster was isolated from an assembly reaction system including (NH4)3VS4, Ag(PPh3)2NO3, OC4H8dtcNa and PhSNa in DMF. The title compound crystallizes in monoclinic space group...A novel heterometallic V2Ag2S4 thiocubane cluster was isolated from an assembly reaction system including (NH4)3VS4, Ag(PPh3)2NO3, OC4H8dtcNa and PhSNa in DMF. The title compound crystallizes in monoclinic space group C2/c with a = 2.0448(3) nm, b= 1.5086(2) nm, c= 1.7923(2) nm, β=109.32(1)°. The structure of the title compound was solved by using 1 500 (I>3σ(I)) unique reflections and refined to R = 0.068. The structural features indicate the formal oxidation state of V(IV) + Ag (I), and partial charge transfer from Ag(I) to V(IV). The actions of reactants used in the reaction are discussed and a supposed formation process of the V2Ag2S4 cluster is suggested.展开更多
文摘: By means of kerogen purification, the proton induced X-ray emission (PIXE) and instrumental neutron activation analysis (INAA), the authors have studied the organic/inorganic occurrence modes of the metallic elements of the Baiguoyuan silver-vanadium deposit hosted in black shale in Hubei Province, China. The result shows that Au, Hg and Ta have a strong tendency to occur organically, with more than 70% of these elements being associated organically. Se, Ga, Ag and Hf are partly associated with organic matter, with more than 20% of them occurring organically. Compared with the above elements, Zn, Cu, As and Sb are weakly associated organically, and tend to be enriched in kerogen. However, Mn, Th, U, V, Co, Cr, AI, Fe and Sc usually occur inorganically. Of the rare earth elements (REE), La, Ce, Tb, Dy, Yb and Lu have stronger ability to be associated with organic matter than Sm and Eu.
文摘Baiguoyuan silver-vanadium deposit is generally thought to be of sedimentary-diagenetic origin. Based on the characteristics of barites, it is suggested that hydrothermal transformation has been involved in mineralization. The barites in black shale can be grouped into irregular ones which were formed during early diagenesis and tabular ones which were formed during late diagenesis. The tabular barites are replaced by pyrite and have formed a regular girdle around them. PIXE analysis states that Ag is greatly concentrated in pyrite replacement girdle. The girdle is the product of hydrothermal transformation. The transformation is one of the main mineralization stages of Baiguoyuan deposit.
基金Project supported by NNSFC and the Natural Science Foundation of Fujian.
文摘A novel heterometallic V2Ag2S4 thiocubane cluster was isolated from an assembly reaction system including (NH4)3VS4, Ag(PPh3)2NO3, OC4H8dtcNa and PhSNa in DMF. The title compound crystallizes in monoclinic space group C2/c with a = 2.0448(3) nm, b= 1.5086(2) nm, c= 1.7923(2) nm, β=109.32(1)°. The structure of the title compound was solved by using 1 500 (I>3σ(I)) unique reflections and refined to R = 0.068. The structural features indicate the formal oxidation state of V(IV) + Ag (I), and partial charge transfer from Ag(I) to V(IV). The actions of reactants used in the reaction are discussed and a supposed formation process of the V2Ag2S4 cluster is suggested.
