Nd Isotopic and Model Age Study of the Shandong Province, North China Craton: Implications for Correlation with South Korea

作     者：Feifei Liu Yaoqi Zhou 

作者机构：School of Geosciences China University of Petroleum Qingdao 266580 China Function Laboratory for Marine Mineral Resource Geology and Exploration National Laboratory for Marine Science and Technology Qingdao 266071 China 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2019年第30卷第5期

页      面：938-951页

核心收录：

学科分类：07[理学] 

基　　金：supported by a scientific and technological innovation project of Shandong Province(No.2017CXGC1608) 

主　　题：Nd model age crustal growth crust reactivation Shandong geochemistry Korea 

摘      要：The geological units in Shandong Province, North China are important parts of the North China Craton and offer important insights into their crustal evolutionary history. This paper presents 611 sets of Nd isotopic data of Archean–Mesozoic rocks from Shandong including the Luxi, Jiaobei, and Sulu terranes, which provides important constraints for crustal growth and reactivation. Nd-depleted mantle model ages(TDM) of Archean rocks with positive εNd(t) values showed that ca. 2.9 and 2.8–2.7 Ga were the most important periods of crustal growth in the Jiaobei and Luxi terranes, respectively, while the period of ca. 2.6–2.5 Ga in the Jiaobei terrane likely indicates a coherent event of crustal growth and reworking. During the Proterozoic, multi-stage rifting and collisional orogenic events possibly led to the reworking of Archean crust in the source region. The Nd isotopic data of the Paleoproterozoic and Neoproterozoic rocks from Sulu indicated significant reworking of older crust with juvenile magmatic input. Crustal reactivation occurred during the Mesozoic. The younger TDM ages of the Mesozoic rocks with low negative εNd(t) values indicate that a juvenile crustal/mantle component was added to the ancient basement. The reactivation reflectes significant crust-mantle interaction via the mechanism of crustal subduction and mantle-derived magma underplating, or possibly asthenospheric upwelling. In addition, the crustal correlation between Shandong and Korea(including the Gyeonggi massif, Ogcheon belt, and Yeongnam massif) is established in this study. The TDM age distribution provides evidence favoring the affinity relationship between the Gyeonggi massif and Ogcheon belt of South Korea and the Jiaobei and Sulu terranes of Shandong, while the Yeongnam massif is more correlated with the South China Block.