伊宁吐拉苏火山盆地金成矿地质特征及勘查技术方法探讨

伴随吐拉苏火山断陷构造发展阶段所存在的钙碱性系列岩浆侵入和陆相火山喷发活动,对金成矿起了至关重要的作用.该区金矿赋矿地层为大哈拉军山组,成矿时代为维宪早中期,主要分布于火山断陷的中心和大哈拉军山组与下伏地层角度不整合接触带,近NS向断裂破碎带是矿体赋存的空间,成矿与黄英岩化蚀变带密切相关,矿化异常元素组合为Au-As-Sb-Ag-Hg,处于相对较低的磁场和高阻、高相位异常内.根据金成矿地质特征和火山盆地的自然地理经济条件,对预查、普查、详查和勘探阶段的勘查技术方法进行探讨.

DISCUSSION ABOUT GOLD MINERALIZATION,EXPLORATION TECHNOLOGY AND METHOD IN YINING TULASU BASIN

The Cal-alkaline magama intrusion and continental volcanic eruption is very impotant on gold mineralization during the development of Tulasu volcanic fault subsidence basin. The gold deposit is hosted by Dahalajunshan formation in the area. The minerogenetic epoch is the middle Visean. The gold deposit is mainly distributed in the center of volcanic fault subsidence and at the contact zone of Dahalajunshan formation with under strata angular unconformity. The near S-N-S-N fault shatter zone is ore-beating space. The mineralization is closely related to topaz alteration. The mineralize anomalous elment formation is Au-As-Sb-Ag-Hg in the relative lower magnetic field and high resistance ,hign phase anomaly. According to gold mineralizing geological feature and the nature geographic economic conditions of volcanic basin, the technology and method of the stages of search, prospecting and exploration is discussed.