Zircon (U-Th)/He Age and Its Implication for Post-Mineralization Exhumation Degree of Linglong and Jiaojia Goldfields,Northwest Jiaodong,China
Sun Huashan
Han Jingbo
Shen Yuke
Liu Liu
Leng Shuangliang
Xu Chong
Yang Qiaomei
Ge Fengjian
Ouyang Shubing
Deng Xu
Abstract：The Linglong and Jiaojia goldfields are the two most famous goldfields in the Northwest Jiaodong with voluminous publication focused on gold mineralization.Whereas it is still a barren land as far to pay attention to the post-mineralization ex-humation.Utilizing the latest low-temperature thermochronological technique,this work carries out a tentative research on the exhumation degree in the two goldfields.The results show that the zircon (U-Th)/He ages in Linglong goldfield vary predomi-nantly between 80 and 100 Ma,while they are of significant concentration between 90 and 105 Ma in Jiaojia goldfield.These ages yielded in this work are different from those of the previous obtained by other methods,they are not the geochronological ages in respond to magmatic-hydrothermal mineralization events,instead they must have recorded the thermochronological ages of the post-mineralization exhumation of the granitoid rocks.Based on the constrain of the zircon (U-Th)/He ages,it can be concluded that the degree of exhumation in this area is roughly in agreement with that from the statistics of the global orogenic gold deposits,about 60 m/Ma.The amount of post-mineralization exhumation in the Linglong goldfield is overall ca.600 -900 m more than that in the Jiaojia goldfield,so the prospecting potential at deep part is larger in the Jiaojia goldfield than that in the Linglong goldfield.
Keywords：zircon (U-Th)/Hedegree of exhumationNorthwest Jiaodong gold concentration areamineralore deposit geology
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 644-654 )