ZIRCON U-Pb DATING OF MONZOGRANITE DIKES IN WENGQUANGOU BORON OREFIELD, EASTERN LIAONING:Constraints on Metallogenic Age
ZHAO Yan1,2, LI Sheng-hui3, YANG Zhong-zhu1,2, ZHANG Peng1,2, CHEN Jing-sheng1,2, ZHANG Jing1,2, CHEN Cong1,2
1. Shenyang Center of China Geological Survey, Shenyang 110034, China; 2. Key Laboratory of Deep Mineral Resources Exploration and Evaluation, Liaoning Provincial Department of Natural Resources, Shenyang 110032, China; 3. Liaoning Non-Ferrous No. 103 Geological Team Co., Ltd., Dandong 118008, Liaoning Province, China
Abstract:A monzogranite dike cuts through the ludwigite orebody in the open pit of Wengquangou boron deposit, Liaodong Peninsula. Samples of the dike are collected for thin section and zircon LA-ICP-MS U-Pb geochronology analysis. The monzogranite dike is characterized by high SiO2 content(71.82%-75.68%) and high Na2O+K2O content (8.41%-10.57%), belonging to calc alkali-high K calc alkaline series granite. The zircon grains in the dikes are euhedral column in shape and dark in the CL image due to the high uranium content. The U-Pb upper intercept age is 1842±29 Ma, among which 9 testing points yield the weighted average age of 1842±30 Ma, indicating that the emplacement age of dike was Late Paleoproterozoic and the Wengquangou ludwigite deposit should be formed earlier. The age is consistent with the post-peak time of metamorphism in the Paleoproterozoic Jiao-Liao-Ji orogeny, reflecting the boron mineralization occurred during the process.
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