首页|Extensive Resetting of Feldspar Pb Isotopic Composition in Archean-Paleoproterozoic Granitic Rocks from the Kongling Terrane,South China:Implications for Tracing Thermal Evolutionary History

Extensive Resetting of Feldspar Pb Isotopic Composition in Archean-Paleoproterozoic Granitic Rocks from the Kongling Terrane,South China:Implications for Tracing Thermal Evolutionary History

扫码查看
原文链接
  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
Feldspar Pb isotopes have been widely used to trace magmatic formation and evolution processes.However,it remains unclear whether post-magmatic thermal events can affect feldspar Pb isotopic ratios.Here,the in situ Pb isotopic composition of feldspar hosted in granitic rocks(thirteen Archean and one Paleoproterozoic)from the northern Kongling terrane,Yangtze Craton,South China,is analyzed.The samples reveal a substantial variation in their Pb isotopic composition,spanning the gap between the 1.9 Ga and present-day geochrons,which indicates extensive resetting by later tectonothermal events.This resetting was interpreted to have likely resulted from Paleoproterozoic and Neoproterozoic tectonothermal events related to the assembly and breakup of the Columbia and Rodinia supercontinents.These results suggest that Pb isotopes should be used cautiously when tracing magma sources and petrogenesis in magmatic rocks that have experienced post-magmatic reworking.However,the in situ Pb isotopic composition of feldspar in ancient granitoids may also potentially be used to reveal later tectonothermal events.The extensive resetting of the Pb isotopic composition in feldspar by regional thermal events may also provide new insights into our understanding of the Pb isotope paradox.

in situ Pb isotopePb isotope resettingthermal eventArchean-PaleoproterozoicKongling terrane

MENG Fanxue、LU Jie、ZOU Zongqi、GUO Jingliang、MENG Yuanku

展开 >

College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China

Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China

State Key Laboratory of Geological Processes and Mineral Resources,School of Earth Sciences,China University of Geosciences,Wuhan 430074,China

Key Laboratory of Gold Mineralization Processes and Resource UtilizationMNR and Shandong Provincial Key Laboratory of Metallogenic Geological Process and Resource UtilizationNational Natural Science Foundation of China

KFKT20210341876037

2024

10.1111/1755-6724.15130

地质学报(英文版)
中国地质学会

地质学报(英文版)

CSTPCD
影响因子：1.414
ISSN：1000-9515
年,卷(期)：2024.98(2)
  • 114