Controlling Structure Mode Of Micro-fine Disseminated Gold Deposits Of Qianxi'nan

The region of interest is located in southwest of Yz platform. So far, there are 50 gold deposits is this area. We saw about concertina concession's macrolithology and systemly sample. We study rock and ore's mocroscopic fabric in room, and analyse its geochemistry of trace elements and REE's character, and use for reference former's results.The main conclusions are as follows: In Qianxi'nan area, two types of gold deposits which located in Yz platform and Yj orogenic belt is difference in its character; Au of Dayakou gold deposit is separated with As, Sb in metallization's process, making between Au and As, Sb to be overlaping in space. Besides, As takes place partly transfer in tectonic process; all LREE of the gold deposits are evidently rich, the average multiple is 10.16, but HREE is relatively low; the average of (La/Sm)N and (Gd/Yb)N is separatly 3.979, 2.396. Showing the fractionation degree of LREE is high, and HREE is the same. Hinting the temperature of mineralizing fluid is low-mid. Ni/ V<1, showing mineralizing circumstance of Qianxi'nan's micro-fine disseminated gold deposits is Sea and land mutual facies' lagoon, finally the paper discusses structure mode of Qianxi'nan's micro-fine disseminated gold deposits——Flat-Ramp mode.