Exhumation history and preservation of the Jiaojia giant gold deposit, Jiaodong Peninsula  

作　　者：Qibin ZHANG Mingchun SONG Zhengjiang DING Meili GUO Mingling ZHOU Changguo DAI Guang HUO Peng ZHANG 

机构地区：[1]CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Shandong Provincial No.6 Exploration Institute of Geology and Mineral Resources,Weihai 264209,China

出　　处：《Science China Earth Sciences》2022年第6期1161-1177,共17页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. U2006201 & 41930424);the Science and Technology Planning Project of Guangdong Province, China (Grant No. 2020B1212060055)。

摘　　要：The Jiaojia giant gold deposit is the largest gold deposit in China, with a total gold reserve of approximately 1200 t.Until now, the knowledge of the exhumation history of post-mineralization period is limited, in particular for the low-temperature thermochronology studies of samples below-1000 m. In this work, we combined zircon fission-track(ZFT) and apatite fission-track(AFT) dating of samples between-1100 and-2000 m to determine the post-mineralization cooling and exhumation history of the Jiaojia giant gold deposit. The ZFT ages ranged from 144.2±6.3 to 124.4±5.5 Ma, representing the cooling period and the disturbance of ore-forming fluid. The AFT ages ranged from 28.1±2.6 to 16.2±1.0 Ma, recording the exhumation and cooling processes. With reference to previous low-temperature thermochronology studies in the Jiaojia goldfield, we estimated the exhumation rate and amount of the Jiaojia giant gold deposit and reconstructed its exhumation and preservation history. The exhumation history was divided into four stages, rapid exhumation(~120–95 Ma), relatively slow exhumation(~95–50 Ma),slow exhumation(~50–30 Ma) and relatively rapid exhumation(since 30 Ma). Each stage corresponds to geological events related to the basin-mountain coupling that have occurred since the Cretaceous in the Jiaodong area, namely, a strong tectonic extension and volcanic eruption in the Jiaolai Basin, subsidence of the Jiaolai Basin and Wangshi Group molasse sedimentary,tectonic quiescence, and the Linqu Group basalt eruption of the Jiaobei uplift. Our results show that the exhumation of the Jiaojia giant gold deposit is ~5.2±1.2 km and the orebody erosion degree is relatively low, indicating huge prospecting potential deep in the Jiaojia giant gold deposit. These findings have significance and practical value for deep prospecting in the Jiaodong area.

关 键 词：FISSION-TRACK Exhumation history Deposit preservation Jiaojia giant gold deposit Jiaodong 

分 类 号：P618.51[天文地球—矿床学]