Heilongjiang Province, Jinchang gold rock mineralogy and genesis of gold deposits

Title: Heilongjiang Province, Jinchang gold rock mineralogy and genesis of gold deposits
　　Author: Lee slope
　　Degree-granting units: China University of Geosciences (Beijing)
　　Keywords: Gold Factory Gold;; magmatic rocks;; pyrite;; ore-forming fluid
　　Summary:
　　East County in Heilongjiang Jinchang gold deposit is located north of the eastern end of the orogenic belt Songnen land is guitar black lava fields forming an important part. The deposit is a typical porphyry-type gold deposits, characteristic of its wall-rock alteration, mineralization type of comparison and determination of regional metallogenic deep exploration has important theoretical and practical significance. This paper from the characteristics of igneous rocks, 18 ore and Neodymium magnets alteration mineralogy petrology, ore geology, ore-forming fluid geochemistry, genesis and prospecting in areas such as research work, mainly to obtain the following results:
　　① No. 18 ore body through the granite rocks ore mineralogy, petrology and geochemistry of chemical research, found that late Indosinian granitoid rocks rich in Fe, Na2O/K2O, DI <90, Fm is 0.65-0.85, Eu loss not strong, δEu> 0.3, La / Yb> 10, is conducive to the formation of the gold mark. Granitoid rocks of the area of ​​trace elements, isotope studies showed that: granite rocks as magma sources under the crust, mantle-derived substances are mixed.
　　② alteration of this area Indosinian granitoid rocks rock chemical analysis, analysis of REE and trace elements analysis. Analysis of test data through comprehensive research and water-rock reactions element migration calculations, ore-forming fluid in the water-rock reactions showed a relatively strong activity, quantitatively confirmed silicification, and potassium-based payment the close relationship between ore mineralization. SiO2, K2O, H2O is the gold migration and deposition of the main media.
　　③ by infrared spectroscopy and X-ray powder diffraction analysis of hydrothermal alteration phase of K-feldspar as the rock strength to increase their degree of order is gradually increased degree of order and close the fluid, there is a certain positive correlation. The final structure of K-feldspar gold plant temperature 400-420 ℃, suggesting they may be the http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php product of hydrothermal alteration.
　　④ According to the gold plant in different stages of pyrite mineralization of trace elements and rare earth elements, indicating that ore-forming fluids from the region gold mines porphyry ore-forming fluid rich in Cl, F is characterized by poverty, a view into how superposition of ore fluids.
　　⑤ different mineralization stages of pyrite inclusions in pyrite He isotopes and Pb, S isotope geochemistry results show that the source of ore-forming fluid show characteristic shell, the shell source components mainly by lower ore body No. 18 granite plaques Rock offers, late in the mineralization may be a small amount of air mixed with water; based on 18 orebody ore granite rocks, minerals and trace elements and rare earth sulfide ore geochemical results further show that the main ore-forming fluids in this area from the crust, and the granite porphyry, granite porphyry in the role of magmatic-hydrothermal stage, multi-stage high-temperature hydrothermal involved in mineralization.
　　Degree Year: 2010