Quantification constraints on time gap for comagmatic gold deposits: Evidence fr

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

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.水利论文@&NpiJe'qg4D

作 者: TAN Jun WEI Junhao LI Shuiru ZHANG Chunhua LI Yanjun GUO Lingli YAN Yunfei  
作者单位:TAN Jun,WEI Junhao,LI Yanjun,GUO Lingli,YAN Yunfei(Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China)
"OWL'B |P6~u0LI Shuiru(Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;Guangxi Geological Survey Institute, Nanning 530023, China)水利论文8m:V `4\^3CH
ZHANG Chunhua(China Communications Second Highway Survey, Design and Research Institute, Wuhan 430056, China) 
刊 名:中国地球化学学报(英文版) 
英文刊名:CHINESE JOURNAL OF GEOCHEMISTRY 
年,卷(期):2008 27(4) 
分类号:P59 
关键词:comagmatic gold deposit   time gap   statistical analysis   Kolmogorov test  
机标关键词:gold depositsdistribution characteristicsnormal distributionsgenetic relationshipconfidence leveltrace elementsisotopic ages 
基金项目:国家教育部博士点专项基金 
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