摘要
A lot of epithermal gold deposits and occurrences, such as Arharlei and Wurenkebulake deposits, have been found in the northeastern Kazakhstan Tianshan Mountains, which is one of the important epithermal gold metallogenic belts in the Central Asian Orogenic Belt. To time the mineralization, the authors dated andesite and andesitic basalt from the host rocks of the Arharlei and Wurenkebulake deposits, respectively, using high-resolution laser-ablation 40Ar/39Ar method. Twenty analyses of andesites from the Arharlei deposit yielded a 40Ar/39Ar isochron age of 304±7 Ma (MSWD=6), and 21 of andesitic basalts from the Wurenkebulake deposit deposit yielded a 40Ar/39Ar isochron age of 280±6 Ma (MSWD=2.4). This shows that the gold deposits in the northeastern Kazakhstan Tianshan have been formed between end Late Carboniferous and Early Permian.