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Study on the Major Characteristics of the Fluid Inclusions of the Main Gold Deposit in Jinping County, Guizhou

Author: WuWenMing
Tutor: YuDaLong
School: Guizhou University
Course: Mineralogy , petrology study of ore deposits
Keywords: Fluid inclusions Ping autumn Eight grams Toungoo
CLC: P618.51
Type: Master's thesis
Year: 2009
Downloads: 29
Quote: 0
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Abstract


Thesis as the main object of study of fluid inclusions in quartz gold quartz vein type gold ore bodies in Jinping County, focusing on the uniform method of fluid inclusions in temperature measurement, laser Raman probe in situ component analysis, gas-liquid two-phase The component measuring, fluid inclusions H, O isotope determination to explore the nature, origin and evolution of the ore-forming fluids. The research and analysis, the following understanding: mineralizing fluid of the study area, the main mineralization stage the overall homogenization temperature is mainly concentrated in the 200 to 350 ℃; the mineralizing fluid fluid salinity ranged from 0.35 to 20.7wt% NaCl.eqv, belong to the low salinity fluids ; mineralization density change at 0.58 to 1.02g/cm 3 overall is a low-density fluid; mineralization pressure of 0.99 ~ 1365.00 bar, the depth to 173.09 1807.75m. Area gold deposits belong to mesothermal deposit epizonal. Deposit gas phase composition of fluid inclusions mainly the H 2 the the O and CO of 2 , as well as a small amount of N 2 C 2 H 4 and CO. Liquid phase component has the following characteristics: cations containing mainly the of Na K , the the of Ca 2 and Mg 2 ; anion Cl - and F - . The area of ??fluid inclusions Na / K ratio of majority is greater than 1, the some mine point of Na / K ratio higher. Cl - / F - ratio similar and relatively high ranging from 6.92 to 65.27, the ore-forming hydrothermal Cl - major anions. Three deposits of hydrogen, oxygen isotope projection the hydrothermal fluids the δD of H 2 O -δ 18 the O H 2 O graphic, flat autumn deposits projection point fell on the area of ??raw the magma water and metamorphic water superimposed; of eight grams deposits two test values ??mean in magmatic water within the region ; ancient fall precipitation between magmatic water and metamorphic water mixed water area, and more close to the meteoric water line near. Eight grams of lead isotopes for normal lead normal lead from a deep source enrichment upward migration of the product; sulfur isotope measurement results of two arsenopyrite samples display its meteorite sulfur characteristics reflect the sulfur may be derived from the deep, and The lead isotope results are consistent. With ancient carbon isotopes show that the ore-forming fluid is the result of metamorphism of strata degassing and mantle degassing release CO 2 participatory role. These data illustrate the strong tectonic activity in the area and metamorphism, mineralization hydrothermal fluids and has a multi-source characteristics of the ore-forming fluid may be mainly derived from deep. Among them, the same ancient Deposits depth shallow, the hydrothermal fluids may be mixed with groundwater.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Precious metals > Gold
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