RESUMO
The Zijinshan gold-copper deposit is the first one of high sulfidation epithermal hydrothermal deposits. The gold bodies up, and the copper bodies down. The gold bodies mainly occur above the ground water table associated with strong silicification, and the copper bodies mainly occur below the ground water table associated with alunitization. The alunite of the Zijinshan gold-copper deposit has four types of occurrence status, that is the altered rock type, the intergrowth-with-Cu-sulphide type, the vein type and the powder type. Different types of the alunite are of different Raman spectra characteristics and fluorescence scattering background. Laser Raman spectra of inclusions in the alunite show that: (1) The characteristics of the Laser Raman spectra of the alunite are of characteristic spectral bands of alunite, just fluorescent scattering weaken gradually from the altered rock type, the intergrowth-with-Cu-sulphide type to the vein type; the alunite in the Powder type has different bands of the Laser Raman spectra relative to the former three types, the intensity of each band is weaker, and it's fluorescent scattering intensity is strongger. (2) The bands in 100-700 cm(-1) of the Laser Raman spectra can be used as "fingerprint" bands indicating the condition of the cation replacement in the molecular structure of alunite. The intensities at 161 and 234 peak change obviously in the bands of the alunite in the altered rock type, which indicating a wide replacement between K and Na; the intensities at 381 and 484 peak in the bands of the alunite in the intergrowth-with-Cu-sulphide type change significantly, indicating Al can be replaced with Cu, Ga, etc.; the larger and stable intensities of the alunite in the vein type in the bands at the peaks about 161, 234, 484, 508, etc. indicate that there are less chances with the replacement between K and Na, Al and Si; fluorescence scatorescent scattering is very strong and the intensity of each band is weaker in the bands of the alunite in the powder type, which indicate that the alunite formed in the underground water condition. (3) The laser Raman spectra of the alunite can be used together with it's infrared spectra, and provide the characteristics of complete vibration spectra of the alunite and the structure information with the mineral research Based on the mineralography, the petrography, the ore deposit geology, the geochemistry of mineral deposits, the regional geological features, the Laser Raman spectra of the alunite (Combined with fluorescence scattering background) can further the evolution process for the Zijinshan gold-copper deposit as a typical high sulfidation epithermal hydrothermal deposit.
RESUMO
The structural characteristics and composition of alunite in the Zijinshan gold-copper deposit were studied by infrared absorption spectroscopy and X-ray powder diffraction analysis. The results show that infrared spectral absorption peaks, the growth degree of crystal faces (006) and (004), and crystal cell parameters of the alunite display gradually decreasing trend from the crater to northwest along the metallogenic belt. Combined with electron probe analysis results, we go further and obtain that the alunite mainly belongs to potassium alunite, and the characteristics of infrared spectra and XRD of the alunite mainly have relation to the content of potassium of the alunite in different parts of volcanic mechanism. Near the crater, with higher temperature, it is helpful for the isomorphism replacement between sodium and potassium, the content of sodium is higher and the content of potassium is lower relatively in the alunite; and away from the crater, the temperature is relatively lower, it is against the isomorphism replacement between sodium and potassium, the content of sodium is lower, and the content of potassium is higher relatively in the alunite.
RESUMO
We present the zero-temperature superconducting (SC) phase diagrams of the two-orbital asymmetric t-J model on a square lattice by means of the auxiliary-boson approach. Besides the two-gap SC and normal phases, we find an orbital dependent intermediate SC phase, in which one orbit is fully SC and another orbit is exponentially vanishing gapped SC. Such an intermediate phase is stable only for sufficient asymmetry in orbital space and doping concentration. The implication of the present scenario on the iron-based and other multi-orbital superconductors is discussed.
RESUMO
OBJECTIVE: To study the clinical and pathologic features of post-transplant lymphoproliferative disorders (PTLD), and to investigate the clinical significance of this diagnosis. METHODS: Four cases of PTLD were studied by routine light microscopy, immunohistochemistry and in-situ hybridization and polymerase chain reaction. The clinical data and follow-up information were also reviewed. RESULTS: In the 4 cases, 3 cases occurred in renal transplant recipients and 1 in bone marrow transplant patient. In the 3 post-renal transplant patients, 2 had polymorphic PTLD and 1 had monomorphic PTLD. The post-bone marrow transplant case was classified as "early" lesion of PTLD. Epstein-Barr virus (EBV) was detected in 2 cases. All the 4 cases studied had received cyclosporine A and steroids after transplantation. The duration between organ transplantation and diagnosis of PTLD from case 1 to case 4 was 42, 7, 129, 2 months. One of the polymorphic PTLD cases belonged to clinical stage II and subsequently died of the disease. Other cases belonged to clinical stage I and were alive for 5 to 40 months after diagnosis of PTLD. CONCLUSIONS: PTLD is a lymphoproliferative disease with distinctive morphologic and clinical characteristics. An association with EBV at least in some cases is observed. The prognosis of PTLD correlates with clinical stage. It may respond to reduction in dosage of immunosuppressive agents.
