| The Jiadi gold deposit is lies in the southeast wing of the Lianhuashan anticline North East trending to the strong deformation zone of the southwestern margin of the Yangtze paraplatform and Southern China fold belt joint part. It is the Guizhou Province Bureau of Geology and mineral resources of 105 Geological brigade newly discovered another medium primary gold deposits following the Damaidi gold deposit in Western Guizhou Mount Emei basalt areas. This paper is on the basis of previous work, research respectively on the geochemical characteristics of the geology, geochemistry and fluid inclusion of the Jiadi gold deposit using optical thin section microscopic identification, X-ray fluorescence spectrometry, ICP-MS, Linkam THMSG600 type cold-hot stage, and compared with the adjacent areas Shuiyindong gold deposit, discuss the regional metallogenic model and prospecting potential of gold deposit in the region, has important significance for native gold prospecting prediction. The main results obtained are as follows:(1) The gold ore body occurred in tectonic altered between Maokou Formation and Mount Emei basalt group(SBT) and the second section tuff of Mount Emei basalt, the host rocks are mainly basaltic tuff, tuff and basaltic volcano breccia. The ore bodies are in stratoid, lenticular, shape is simple form to middle, the average grade is 3.17×10-6.(2)Ore texture are mainly cataclastic texture, hypidiomorphic-xenomorphic texture and metasomatic texture, ore structure are mainly massive, banded, disseminated and vein structure etc. Mineralization alteration is mainly silicification, pyritization, otherwise a few arsenopyrite and clay.(3) The geochemical characteristics of major elements research show that these characteristics of the gold ore and Mount Emei basalt basic consistent, may be correlated with the ore bearing rock is Mount Emei basalt.(4) The geochemical characteristics of trace elements show that Au, As, Sb, Hg, Tl of the ore relative enrichment to surrounding rock, reflect into the hydrothermal process.(5)The geochemical characteristics of rare earth elements of rock and ore show that there are some differences between the REE content and the characteristic parameters of ore and rock, but the chondrite normalized curve is very consistent, the overall performance of the negative Ce anomaly, no obvious abnormal Eu, feature rich in LREE, hree depleted, the distribution curve of the moderate right-wing, may indicate that the ore-forming fluid is not caused REE change.(6) Geochemical studies of fluid inclusions display, homogenization temperature range of ore-forming fluid is 193 ~ 227℃, the average value of 211 ℃, salinity is 4.03 ~ 8.28wt% Na Cl, the average value is 6.3wt% Na Cl, the density ranged from 0.87 to 0.92 g/cm3, the average value is 0.9g/cm3, with the characteristics of medium- low temperature, low salinity and medium density. According to the preliminary, the Jiadi gold deposit has the characteristics of medium- low temperature hydrothermal mineralization.(7)Through comparative study found that the geological and geochemical characteristics of the Jiadi gold deposit and the Shuiyindong gold deposit are basically the same. They may have the similar genesis of the deposit, belong to a metallogenic system.As previously mentioned, the Jiadi gold deposit controlled by lithology combination, anticline structure and altered structural variants(SBT), has the same metallogenic model with the Shuiyindong Carlin type gold deposit, may show Mount Emei basalt area in Western Guizhou has great prospecting potential. |
PDF Full Text Request