| Qin-Hang Structural Belt, an important multi metallogenic belt in South China, isformed by the collision and joint of the Yangtze Block and the Cathaysia Block. It has mainlyexperienced complex tectonic deformation movements during geological times of Jinning,Caledonian, Indosinian, Yanshanian. Since it has been chiefly controlled by dynamical systems ofTethyan, Neotethyan and the Pacific structural domains, it has complicated and particularstructural evolution and mechanism. Qin-Hang Belt possesses a broad range of ore deposit, whichwere formed during different periods and controlled by structures of various time and space anddifferent types, are widespread within the study area. At present, restructuring, material recreating,tectonics and dynamics of Jinning, Caledonian, Indosinian, Yanshanian along the belt, stayunraveled.Utilizing regional geological material, previous researches and field geological survey,researches have been made on Qin-Hang Belt of from Jinning to Yanshanian, includingtectonospheres distribution and characters, granite distribution rule, fold deformation episodes andoverlay characteristics, as well as mechanics of regional fault. Tectonic evolution background anddynamic mechanism of period from Neoproterozoic to Mesozoic, were discussed. Meanwhile, therelationship between tectonic movement and mineralization was summarized. Understandings andconclusions are as follows,(1) From Neoproterozoic to Mesozoic, Qin-Hang Belt has successively witnessed Jinningmovement, Caledonian movement, Indosinian movement and Yanshan movement. Jinningexperienced ocean-continent subduction and continent-continent collision. After Caledonianmovement, the belt entered the integrated block development period of South China. Twice of foldorogeny occured in Indosinian. During Yanshanian, affected by intracontinental blockconvergence, strong intracontinental deformation and ganite invasion happened, which led tolarge-scale mineralization in East China.(2) Within the study area, metallization and deposit formation occured to different extents.Mineralization in the area was controlled by ruptures. For instance, Jinning deposits, mainlydistributing in the conjunction belt of Yangtze old landmass and Huaxia old landmass, werepredominantly controlled by NNE-direction rupture say, Yifeng-Jingdezhen-Shexian Rupture andNortheastern Jiangxi Province Rupture. Yanshanian is the peak minerallization stage, duringwhich deposits werer mainly located at the junction of NE-direction rupture and NNE-directionrupture.(3) Yanshanian is abundant in copper, gold, lead zinic, silver, nb-ta and tin etc., and mainlydeveloped deposits related to little rock mass. Mineralization character reveals confounding andcontamination of copper, gold silver, lead zinic and tungsten tin. Mineralization was greatlyinfluenced by intermediate acid-acid magmatism in Yanshanian. Deep focus syntectic porphyry is its unique mineralization character.(4) Tectonic movement and magmatism of Qin-Hang Belt have similar migration rules, thatnew tectonic events in the southeastern area would relocated old structure boundery in the westand granite distribution takes on a tendency of getting fresh from west to east. These tectonicmovement characters and igneous rock restrict source emplacement and deposit formation ofQin-Hang Belt. |
PDF Full Text Request