Research Institute No240
Research Institute No240
Wu D.,Research Institute No240 |
Zhuang T.,Research Institute No240 |
Tian L.,Research Institute No240 |
Liu X.,Research Institute No240 |
Li W.,Jilin University
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2017
The Lianshanguan area is located in the eastern Liaoning uranium metallogenic belt which belongs to the uranium metallogenetic province of the North China block. The reconnaissance and exploration on uranium deposit have been carried out in recent years to understand the mineralization characteristics and ore genesis. Based on the field investigation and laboratory studies, authors systematically studied petrologic, geochemical and wall-rock alteration characteristics of ore-hosting rocks. The results show that there are four types of anatexites in the ore-hosting rock series, which are characterized by the high silica content and the various content of chlorite. Moreover, there is a negative correlation between quartz and chlorite contents in the anatexite. The major element compositions in the ore-hosting rock show that it contains high SiO2, Na2O and K2O, with slightly high Al2O3 and low MgO and CaO. Meanwhile, the trace elements show the enrichment of Be, Mo, Pb, Y, Ba, La, Cu and depletion of Co, Ni, Zn, Cr, Ti, V. These studies significantly demonstrate that such paragenetic elements as Pb, Mo, V, Be as are also closely related to uranium mineralization. Rare-earth element characteristics of samples are remarkable Eu negative anomalies, enriched in LREE (light rare earth elements) and depleted in HREE (heavy rare earth elements). Colloidal pyritization, chloritization, silicification have close relationship with uranium mineralization. It's first proposed that there occur re-melting migmatite-hydrothermal uranium deposits in the Lianshanguan area. © 2017, Science Press. All right reserved.
Li H.-G.,Research Institute No240 |
Wang Y.-X.,Research Institute No240
Yejin Fenxi/Metallurgical Analysis | Year: 2012
The analysis method of mercury in geochemical exploration samples by hydride generation-atomic fluorescence spectrometry combined with polyethylene film closed ore dissolution in concussive water bath was proposed. Parameters, including ore dissolution method, lamp current, carrier gas, shielding gas flow and potassium borohydride concentration, were optimized. Under optimal conditions the calibration curve of mercury was established, the correlation coefficients were in range of 0.9991-0.9993, and the detection limit of mercury was 0.125 ng/g. The proposed method was applied to the analysis of standard and actual geochemical exploration samples, and the determination results were consistent with the certified values or those obtained by two-stage gold amalgamation cold vapor atomic absorption spectrometry after closed dissolution. The relative standard deviation (RSD, n=5) was less than 3.5%.