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Characteristics and Identification Sign of Ore-formimg Fluid of Julong’an Uranium Deposit, in Xiangshan Uranium Ore-field

Author: QiuLinFei
Tutor: OuGuangXi
School: Nuclear industry, Beijing Institute of Geology
Course: Mineral prospecting and exploration
Keywords: Phase Shanju Long Um uranium deposits Fluid inclusions Ore-forming fluids Identification mark
CLC: P619.14
Type: Master's thesis
Year: 2009
Downloads: 60
Quote: 1
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Abstract


In this thesis study Habitat Long Um deposit, the deposit is located in the Gan-Hang tectonic volcanic rock uranium mineralization with southwest segment - Xiangshan volcanic collapse the western part of the basin, is one of the major uranium deposits in the phase Orefield. On the basis of geological investigation, by fluid inclusions rock phase school microthermometry science, comparative study of single fluid inclusions laser Raman ingredients and groups of inclusions composition, identifying ranked Long Um uranium mineralization fluid basic properties (temperature, salinity, and composition, etc.), and stable isotopic characteristics of the ore-forming fluid carbon, hydrogen, oxygen, combined with the geological - structural features, explore the source of the ore-forming fluid and mineralization mechanism, the system summarizes the identification mark of the ore-forming fluids. Achieved innovative results and understanding of: (1) to identify the nature of the ranked Long 庵 deposit ore-forming fluids. The overall mineralizing fluid Na -Ca 2 -K -F - -S 2 - the-Cl - -CO 2 -H 2 O solution the rich CO 2 H 2 the CH 4 and other volatile matter rich as minerals, halogen (F, Cl), sulfur, P and alkali metal - high temperature, medium - high salt The degree of fluid. (2) first proposed ranking Lung Um deposit - high-temperature hydrothermal deposits, mineralization period early stages of mineralization temperature of 300 to 440 ℃, the main mineralization stage mineralization temperature of 220 to 400 ° C. (3) to determine the ranking Lung Um mineralization pressure and mineralization depth. The metallogenic pressure of 89 Mpa ~ 188 Mpa, mineralization depth of about 3.3 km to 4.3 miles. (4) determine the ore-forming fluids of ranked Long 庵 deposit deep mantle source fluid. Mineralizing fluid volatile-rich, in rich as minerals, halogen, sulfur, P and alkali metal - high temperature, medium - high salinity fluid; carbon, hydrogen, sulfur stable isotope characteristics δ13C V-PDB -5.2 ‰ ~ -1.9 ‰, δD to -65.8 ‰ ~ (-82.7) ‰, the the average pyrite δ34S value of 1.06 ‰. Deep (mantle) fluid role in the mineralization process mainly with the conduct of the mineralization, mineralization shallow fluid added constantly late. (5) confirmed the ranked Long 庵 deposit mineralization process fluid boiling, fluid boiling is the main mechanism for ranking Lung Um deposit into minerals precipitation. Ranking Lung Um deposit of uranium mineralization in the key fluid boiling deep source fluid rich minerals and mineralization agent hot under high temperature and pressure to migrate to specific parts of the structure, resulting uranium rapid precipitation gathered into Mine results. (6) The system summarizes the identification mark of ranked Long 庵 deposit ore-forming fluids: ① structure flag: to secondary high angle (inclination gt top regional deep faults; 60 °) Zhang shear tectonic facies lithologic variation composite parts, that is conducive to conducting a deep source fluid and the fluid pressure boiling and ore storage site; ② petrology flag: a strong alkali metasomatism or red hematite altered, then filled with purple (black) color fluorite veins and their associated mineralization and alteration; ③ mineralogical indicators: country rock with alkali metasomatism or hematite of dykes filling or the tectonite cement rich purple (black) color fluorite, pyrite chlorite, apatite and other minerals; ④ fluid inclusion assemblages (FIA) logo: gas inclusions, CO 2 multiphase inclusions containing daughter minerals multiphase inclusions portfolio boiling wrapped body signs; signs of ⑤ the fluid inclusions temperature with the ingredients: - high temperature (220 to 440 ° C), medium - high salinity (16% to 61.13%), the rich CO 2 H 2 CH 4 CO halogen (F, Cl), sulfur, P and alkali metal fluid; ⑥ stable isotope flag: a deep mantle source of carbon, hydrogen , oxygen, sulfur isotopic composition of the fluid.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Radioactive elements > Uranium
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