成都理工大学学报（自然科学版）2025，Vol.52Issue(3)：523-541,19.DOI:10.12474/cdlgzrkx.2024032201
华北克拉通中部造山带吕梁群的形成时代与构造环境
Formation age and tectonic setting of the Lüliang Group in the Trans-North China Orogen,North China Craton
摘要
Abstract
The Lüliang Group is situated in the central part of the Trans-North China Orogen(TNCO),North China Craton.Investigations of the formation age and tectonic setting of the group are helpful for understanding Neoarchean-Paleoproterozoic regional tectonic evolution.Petrography,geochemistry,and zircon U-Pb dating are combined to study meta-sedimentary and meta-volcanic rocks in the Lüliang Group.The findings reveal that the maximum depositional ages of meta-sedimentary rock samples are～2 510 Ma(Yuanjiacun Formation)and～2 443 Ma(Peijiazhuang Formation),while the crystallization ages of meta-volcanic rock samples are～2 369 Ma(Jinzhouying Formation)and～2 187 Ma(Dujiagou Formation).These new data,combined with previous geochronological studies,imply that the Lüliang Group can be separated into lower and upper sections.The Yuanjiacun and Peijiazhuang Formations of the lower part consist of meta-sedimentary rocks,and were mainly deposited in the late Neoarchean to early Paleoproterozoic.The Jinzhouying and Dujiagou Formations of the upper part are composed of meta-volcanic rocks,and formed in the mid-Paleoproterozoic.Geochemical data show that the meta-sedimentary rocks in the Lüliang Group may have been sourced from acidic magmatic rocks in an active continental margin,while the protoliths of the metamorphic mafic volcanic rocks are likely arc volcanic rocks.Thus,the Lüliang Group may have formed in an active continental margin.The Lüliang Group is similar in age to the late Neoarchean to mid-Paleoproterozoic arc-related magmatic rocks in the Lüliang-Yunzhongshan area and the TNCO,indicating that the orogen may have originally been a long-lived magmatic arc.关键词
新太古代—古元古代/活动大陆边缘/吕梁群/华北克拉通/锆石U-Pb定年Key words
Neoarchean-Paleoproterozoic/active continental margin/Lüliang Group/North China Craton/zircon U-Pb dating分类
天文与地球科学引用本文复制引用
卢成森,钱加慧,尹常青,张健,高彭,吴尚京..华北克拉通中部造山带吕梁群的形成时代与构造环境[J].成都理工大学学报（自然科学版）,2025,52(3):523-541,19.基金项目
国家自然科学基金项目(42325205,42372227,42025204,41972197) （42325205,42372227,42025204,41972197）
湖南省教育厅重点项目(22A0499). （22A0499）
