Studying On The Model Of Rock-forming And Ore-forming, And The Prospecting Prediction For Karatungk Magmatic Cu-Ni Sulfide Deposit In Xinjiang

The Karatungk magmatic Cu-Ni sulfide deposit exists in the Karatungk metallogenic belt in northern Xinjiang in China. The Karatungk metallogentic belt is an important magmatic and tectonic mobile zone, whose geotectonic location is very unique. It is characterized by complex geological structures, frequent magmatic activities, rich in ore resources and lots of metal deposits, thus constituted one of the important metallogentic belts of Cu-Ni nonferrous and noble metal deposits. Studying on the model of rock-forming and ore-forming, and the prospecting prediction for Karatungk magmatic Cu-Ni sulfide deposit, it is of great significance to drive a new round of prediction in the Karatungk metallogenic.belt.Based on summarizing results from other people and analyzed by geological synthetic method, the paper gives a detail research on the metallogenic geotectonic background, the geological, geophysical and geochemical characteristics of the deposit, and also the genesis of the deposit, mechanism of rock-forming and ore-forming in the Karatungk magmatic Cu-Ni sulfide deposit. Based on these, the paper has researched the location prediction for concealed ore-bodies of the Karatungk magmatic Cu-Ni sulfide deposit, concluded the regularities of prediction and pointed out geological synthetic exploring model.Through studying, some new knowledge are obtained as follows:1. In terms of chemical composition, the intrusive rock bodies are characterized by addition of Mg and Fe, depletion of Ca, slight addition of alkali, and slight depletion of Si and Al, belonging to normal ferromagnesian intrusions. Based on the characteristics of sulfur isotope, lead isotope, rare earth element, and initial 87Sr/MSr values, all show that the rock-forming substance comes mainly from the mantle.2. Through analyzing geochemical character of rare earth element, and platinum group element in rocks and ores in both south and north intrusive rock belt, for the first time on the view of geochemistry, expound and prove that these rock-forming and ore-forming substances are from a same source of ore-bearing magma, and the ore magma was liquated from the ore-bearing magma in medium magma chamber, then intruded upon and formed thevery dense massive extremely Cu-rich, Ni-rich ores.3. It is the first time to put forward a new view that the main ore-forming substance originates from the boundary of the core and the mantle, and to set up a metallogenic model for the Karatungk magmatic Cu-Ni sulfide deposit.4. The paper affirms and establishes that the geophysical model can be described as a high magnetic activity(>630nT), high polarizability(>7%), high gravity and a low resistivity (<150 'm).5. Based on analyzing geophysical synthetic anomaly in detail, for the first time, the paper concluded the regularities of prediction, pointed out two prediction areas, and determined prospecting target, and founded the complicated exploring model of multi ?information geoscience combining the geological mineral-formation condition, feature of geology and geochemistry in the deposit, and ore-controlling factors.