Metallogenic Regularity And Metallogenic Potentiality Evaluation Of Qimantage Iron And Polymetallic Deposit In Qinghai Province

Qimantage area is situated in the west of part of the East Kunlun metallogenic belt. Inrecently years, a lot of Iron polymetallic deposits were found in this area, which makes it tobe a famous Iron polymetallogenic province in Qinghai. This disssertation will analyze theregional mineralization background and the classic deposits, study the metallogenic regularity,and evaluate metallogenic potentials detailedly in the following.(1) There exposed a wide range of strata from Upper Archean to Cenozoic in Qimantagearea. Intrusive rocks are also very common which could be classified into Variscan period,Indosinian period, and Himalayan period. This area is locatd in an aeromagnetic gradient beltand exhibits a series of obvious geochemical anomalies, which suggesting a favorablemetallogenic environment.(2) Based on geological analyzations and geochemistry studies on the four mineraldeposits like Galinge, Yemaquan, Kendekeke and Hutouya in Qimantage area, it is concludedthat the Iron polymetallic mineralization is related to the hydrothermal spout sedimentationand later polyphases of hydrothermal reformation that are probable skarnization.(3) After detailed researches on regional ore-controlling tectoncis, mineralization-relatdstrata and structures on1:10000scale, distribution regularity and genetic types of theseabove deposits, a primary evolution model was contributed for the metallogenic system likethis: Variscan and Indosinian granit provies hydrothermal source and mineral resources andlater metamorphism and deformation events make the minerals migrate and enrich.(4) On the basis of analyzes on the magnetic data, the fault system, structural frameworkand distribution of the relic magnetic field of orefields was figured out. Geophysical magneticsurvey evaluations are proved to be a direct and efficient way to predict Iron polymetallicdeposits in this area in terms of enclosing the favorable exploration prospect areas, the nextfavorable tectonic belts and etc.(5) According to Geochemical block theory, the mineralization potential of theQimantage area was evaluated and classified into three primary geochemical bodies, fivesecondary geochemical bodies and three level3geochemical bodies. After overallconsideration with the geological setting and the Geophysical potential evaluation, this area was specifically divided into five prospecting targets such as West Jingreng-Yingqinggou,Kendekeke mining field and its surrounding, Yemaquan-Niukutougou, Galinge mining fieldand its surrounding and Heishan.