摘要
矿床的直接定年就是直接对成矿流体或矿石矿物进行同位素定年 ,这样确定的年龄就直接代表了成矿年龄。目前主要有石英和闪锌矿中流体包裹体的Rb Sr同位素定年、黄铁矿和石英中包裹体的Ar Ar同位素定年、金属硫化物的Rb Sr同位素定年、金属硫化物和氧化物的Sm Nd同位素定年、金属硫化物的Re Os同位素定年 。
In recent years, many direct isotope dating for metallic ore deposits have been developed owing to the use of the new generational thermal ionization mass spectrometry with high precision and high sensitivity. The direct isotope dating means the direct determination of metallogenic ages of ore-forming fluids or ore minerals. Therefore, the results of direct isotope dating represent the true mineralization ages. The main direct isotope dating methods include: Rb-Sr isotope dating of fluid inclusions in quartz or sphalerite; Ar-Ar isotope dating of fluid inclusions in pyrite and quartz; Rb-Sr isotope dating of sulfides; Sm-Nd isotope dating of sulfides and oxides; Re-Os isotope dating of sulfides; and stepwise leaching Pb-Pb isotope dating of single ore mineral. In this paper, these methods are summarized and discussed, and we hope that these methods will offer more contributions to improving the research on economic geology in China.
出处
《地学前缘》
EI
CAS
CSCD
2004年第2期425-434,共10页
Earth Science Frontiers
基金
国家自然科学基金资助项目 ( 4 0 2 3 40 5 1
40 2 2 13 0 1)
关键词
同位素年代学
成矿事件
直接定年
金属矿床
isotope geochronology
mineralization events
direct dating
metallic ore deposits
