Geochemistry and U–Pb zircon ages of metamorphic volcanic rocks of the Paleoproterozoic Lüliang Complex and constraints on the evolution of the Trans-North China Orogen, North China Craton
Geochemistry and U–Pb zircon ages of metamorphic volcanic rocks of the Paleoproterozoic Lüliang Complex and constraints on the evolution of the Trans-North China Orogen, North China Craton
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古元古代吕梁杂岩变质火山岩地球化学、U-Pb锆石年龄及其对华北造山带、华北克拉通演化的制约
DOI：
10.1016/j.precamres.2011.07.006
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发表时间：
2012-12
影响因子：
3.8
通讯作者：
中科院分区：
文献类型：
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作者：
古元古代L梁杂岩位于横贯北中国造山带西缘的中部，由火山岩、沉积岩和古元古代花岗岩类侵入体组成。火山岩和早期花岗岩类强烈变形，变质为绿片岩-角闪岩相。这些变质火山岩以玄武岩至玄武岩安山岩为主。这些变质火山岩的母质镁铁质岩浆主要来源于5%~30%的尖晶石二辉橄榄岩部分熔融成尖晶石-石榴石二辉橄榄岩，并被俯冲熔体富集。镁铁质岩浆经历了分离结晶和地壳同化作用。对野鸡山群和L梁群两个变质火山岩的锆石U-Pb定年结果表明，它们分别形成于2 2 10±13 Ma和2 2 13±47 Ma，变质时间为∼1832 Ma。这说明野鸡山组和L梁组变质火山岩形成于古元古代。结合新近报道的界河口群和古元古代花岗岩类的锆石U-Pb年龄，表明L郁梁杂岩的所有岩性组合都是在古元古代形成和变质的，而不是在新太古代。岩石学、年代学和地球化学资料表明，古元古代L梁杂岩的地球动力学演化参与了活动大陆边缘岩浆弧系的发展，在∼2.2Ga产生了广泛的与弧有关的岩浆活动。L杂岩经历了强烈的变形和变质作用，并在1.88-1.83Ga碰撞事件中并入大北中国造山带，随后在∼1.80Ga发生碰撞后伸展。
The Paleoproterozoic Lüliang Complex is situated in the central part of the western margin of the Trans-North China Orogen and consists of volcanic rocks, sedimentary rocks and Paleoproterozoic granitoid intrusions. The volcanic rocks and earlier granitoid rocks were strongly deformed and metamorphosed into the greenschist- to amphibolite-facies. These metamorphosed volcanic rocks are dominated by basalts to basaltic andesites. The parental mafic magmas of these metamorphosed volcanic rocks were mainly derived from the 5% to 30% partial melting of spinel lherzolites to spinel-garnet lherzolites which had been enriched by the subduction melts. Mafic magma experienced fractional crystallization and crustal assimilation. U–Pb zircon dating on two metamorphosed volcanic rocks from the Yejishan and Lüliang groups reveals that they formed at 2210±13Ma and 2213±47Ma, respectively, and were metamorphosed at ∼1832Ma. This suggests that the metamorphosed volcanic rocks in the Yejishan and Lüliang groups formed synchronously in the Paleoproterozoic. These new ages, integrated with recently reported U–Pb zircon ages for the Jiehekou Group and Paleoproterozoic granitoids, suggest that all of the lithological assemblages of the Lüliang Complex formed and were metamorphosed in the Paleoproterozoic, not in the Neoarchean. Petrological, geochronological and geochemical data suggest that the geodynamic evolution of the Paleoproterozoic Lüliang Complex was involved in the development of a magmatic arc system at an active continental margin, generating widespread arc-related magmatism at ∼2.2Ga. The Lüliang Complex then underwent intense deformation and metamorphism, and was incorporated into the Trans-North China Orogen during the 1.88–1.83Ga collisional event which was followed by post-collision extension at ∼1.80Ga.
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影响因子：
3.1
作者：
Jian Zhang;Guochun Zhao;San-zhong Li;M. Sun;Shuwen Liu;S. Wilde;A. Kröner;C. Yin
通讯作者：
Jian Zhang;Guochun Zhao;San-zhong Li;M. Sun;Shuwen Liu;S. Wilde;A. Kröner;C. Yin
影响因子：
2.8
作者：
H. Halls;Jianghai Li;D. Davis;Guiting Hou;Baoxing Zhang;X. Qian
通讯作者：
H. Halls;Jianghai Li;D. Davis;Guiting Hou;Baoxing Zhang;X. Qian
影响因子：
3.8
作者：
Songnian Lu;Guochun Zhao;Huichu Wang;Guo Hao
通讯作者：
Songnian Lu;Guochun Zhao;Huichu Wang;Guo Hao
影响因子：
2.7
作者：
A. Hall
通讯作者：
A. Hall
DOI：
--
发表时间：
2010
期刊：
--
影响因子：
--
作者：
Jiang Neng;Guo Jinghui;Zhai Mingguo;Zhang Shuangquan
通讯作者：
Jiang Neng;Guo Jinghui;Zhai Mingguo;Zhang Shuangquan