Apatite Fission Track Thermochronology of Granite from the Xiazhuang Uranium Ore Field,South China:Implications for Exhumation History and Ore Preservation  

作　　者：SUN Yue CHEN Zhengle PAN Jiayong HUO Hailong LI Haidong SUN Junjie XU Guangchun 

机构地区：[1]State Key Laboratory of Nuclear Resources and Environment,School of Earth Sciences,East China University of Technology,Nanchang 330013,China [2]Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China [3]No.290 Research Institute,CNNC,Shaoguan,Guangdong 512029,China

出　　处：《Acta Geologica Sinica(English Edition)》2024年第2期430-440,共11页地质学报（英文版）

基　　金：the Foundation of State Key Laboratory of Nuclear Resources and Environment(Grant Nos.NRE2021-01,2022NRE34);the National Natural Science Foundation of China(Grant No.42162013);the Third Xinjiang Scientific Expedition Program(Grant No.2022xjkk1301);the Fund of National Key Laboratory of Science and Technology on Remote Sensing Information and imagery Analysis,Beijing Research Institute of Uranium Geology(Grant No.6142A01210405).

摘　　要：Xiazhuang uranium ore field,located in the southern part of the Nanling Metallogenic Belt,is considered one of the largest granite-related U regions in South China.In this paper,we contribute new apatite fission track data and thermal history modeling to constrain the exhumation history and evaluate preservation potential of the Xiazhuang Uranium ore field.Nine Triassic outcrop granite samples collected from different locations of Xiazhuang Uranium ore field yield AFT ages ranging from 43 to 24 Ma with similar mean confined fission track lengths ranging from 11.8±2.0 to 12.9±1.9μm and Dpar values between 1.01 and 1.51μm.The robustness time-temperature reconstructions of samples from the hanging wall of Huangpi fault show that the Xiazhuang Uranium ore field experienced a time of monotonous and slow cooling starting from middle Paleocene to middle Miocene(~60-10 Ma),followed by relatively rapid exhumation in the late Miocene(~10-5 Ma)and nearly thermal stability in the Pliocene-Quaternary(~5-0 Ma).The amount of exhumation after U mineralization since the Middle Paleogene was estimated as~4.3±1.8 km according to the integrated thermal history model.Previous studies indicate that the ore-forming ages of U deposits in the Xiazhuang ore field are mainly before Middle Paleocene and the mineralization depths are more than 4.4±1.2 km.Therefore,the exhumation history since middle Paleocene plays important roles in the preservation of the Xiazhuang Uranium ore field.

关 键 词：apatite fission track exhumation history ore preservation Xiazhuang Uranium ore field South China 

分 类 号：P619.14[天文地球—矿床学] P588.121[天文地球—地质学]