Quantification constraints on time gap for comagmatic gold deposits:Evidence from chronological statistics  

作　　者：TAN Jun WEI Junhao LI Shuiru ZHANG Chunhua LI Yanjun GUO Lingli YAN Yunfei 

机构地区：[1]Faculty of Earth Resources, China University ofGeosciences, Wuhan 430074, China [2]Guangxi Geological Survey Institute, Nanning 530023, China [3]China Communications Second Highway Survey, Design andResearch Institute, Wuhan 430056, China

出　　处：《Chinese Journal Of Geochemistry》2008年第4期325-334,共10页中国地球化学学报

基　　金：supported by the Doctoral Education Program Fund of the Ministry of Education,Peoples Republic of China (No. 20040491502)

摘　　要：The time gap between diagenesis and mineralization (TGDM) for comagmatic gold deposits (CGD) plays an important role in confirming the genetic relationship between gold deposits and their related intrusions. With the help of preciously published isotopic ages of some typical gold deposits and their related rocks in China,the authors have discussed and quantified the distribution characteristics and scope of the TGDM. Statistical analyses and Kolmogorov tests showed that mineralizing events are either contemporaneous with or slightly postdate their cognate magma. The TGDM conforms with normal distributions at a 0.05 confidence level and clusters between 0 and 16.0 Ma with a mean of 7.0 Ma. Thus,if the TGDM of CGD is less than 16.0 Ma,it is reasonable to consider,with the aid of other evidence,the possibility of its comagmatic genetic affiliation. The authors also emphasized that to get a precise time gap it is necessary to strengthen the diagenesis-mineralization geological background of the deposits studied,and to pay attention to the study of time gap in combination with trace elements and isotope tracing.The time gap between diagenesis and mineralization （TGDM） for comagmatic gold deposits （CGD） plays an important role in confirming the genetic relationship between gold deposits and their related intrusions. With the help of preciously published isotopic ages of some typical gold deposits and their related rocks in China, the authors have discussed and quantified the distribution characteristics and scope of the TGDM. Statistical analyses and Kolmogorov tests showed that mineralizing events are either contemporaneous with or slightly postdate their cognate magma. The TGDM conforms with normal distributions at a 0.05 confidence level and clusters between 0 and 16.0 Ma with a mean of 7.0 Ma. Thus, if the TGDM of CGD is less than 16.0 Ma, it is reasonable to consider, with the aid of other evidence, the possibility of its comagmatic genetic affiliation. The authors also emphasized that to get a precise time gap it is necessary to strengthen the diagenesis-mineralization geological background of the deposits studied, and to pay attention to the study of time gap in combination with trace elements and isotope tracing.

关 键 词：黄金沉积 时间间隙 统计分析 测试 

分 类 号：P59[天文地球—地球化学]