Orefield Structural Research And The New Discovery Of The North-south Belt Of Yinkeng Pb-Zn-Ag Ore-field In The South Jiangxi Region

The Yinkeng deposit, located in the east part of the Yudu-Ganxian ore field, isone of the most important Pb-Zn-Ag deposits in the east part of the Nanlingmetallogenic belt.. Structural study of the mine field is quite weak, for example,controlling ore veins apparent fracture classified as stratabound deposits. Select thetitle, not only has a direct prospecting significance, but also can play a role in thedemonstration area.This paper through a large number of field geological survey and laboratoryanalysis, timely submission of research reports and dissertations. This article madethe following progress:(1) First discovered the unconformity between Jurassic structure andQingbaikouan Curry Formation. Providing a limit time of geological evidence ofOrefield basement structure, but also an important information of regional tectonicevolution.(2) By the statistics of joints, the measurements of fracture and fold rebuilt thestructure framework of silver pit ore field. Joints focus on NW260°~310°.Displayed that the near the north-south trending structures influence by the lateSEE-NWW compressive stress.The hub of north-south base folds from north tosouth is change by257°→13°→352°→352°; the inclination ofaxial is283°, dip angle is85°; The between wing angle is35°to55°, wasanalyzed to determine the north and south to retest recent sharp prismatic folds ofwrinkles. The directions of the compressional stress in the ore deposit changed fromWE→NW-SE→NWW-SEE.(3) First discovered ore containing quartz veins located in the north-south faultstrending folds. underground mapping found13similar north-south veins, andproposed a new set of belt. Display folds+fracture controlled features.(4) The quartz veins, which samples D-O18projection concentrated in therange of metamorphic water. Sulfur isotope34S values close to normal, the range of3.1‰, indicating that sulfur source is relatively simple, from the upper mantle; pressure between (5~180)×105Pa and temperature between250℃~280℃,which reflects the moderate temperatures and low pressure environment hydrothermalmineralization.The north and south silver gold belt is a new prospecting direction in the areaalso has great potential for mineralization.