DOI: 10.1007/s00531-012-0821-0
Scopus记录号: 2-s2.0-84875384344
论文题名: U-Pb geochronology and Lu-Hf isotopes of zircons from newly identified Permian-Early Triassic plutons in western Liaoning province along the northern margin of the North China Craton: Constraints on petrogenesis and tectonic setting
作者: Bai X. ; Liu S. ; Wang W. ; Yang P. ; Li Q.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2013
卷: 102, 期: 3 起始页码: 671
结束页码: 685
语种: 英语
英文关键词: Gabbro, diorite, and monzogranite
; Northern margin of the North China Craton
; Permian-Early Triassic magmatism
; Petrogenesis
; Tectonic setting
; Zircon U-Pb-Hf isotopic systematics
Scopus关键词: asthenosphere
; continental margin
; crustal contamination
; geochronology
; Grenvillian orogeny
; hafnium
; isotopic composition
; lithospheric structure
; lutetium
; magmatism
; mantle source
; Permian-Triassic boundary
; petrogenesis
; pluton
; tectonic setting
; uranium-lead dating
; zircon
; China
; Liaoning
; North China Block
英文摘要: Mafic to felsic gneisses along the northern margin of the North China Craton (NMNCC), in western Liaoning province, China, were previously assumed to be part of Archean metamorphic basement but are here identified as younger (Permian-Early Triassic) intrusions. LA-ICP-MS zircon U-Pb isotopic dating reveals that the magmatic precursors of the mafic gneisses were emplaced from 295 ± 3 to 259 ± 2 Ma and that the magmatic precursors of the dioritic and monzogranitic gneisses were emplaced at 267 ± 1 and 251 ± 2 Ma, respectively, thus recording a continuum of Permian to Early Triassic magmatism. The mafic and dioritic rocks exhibit zircon εHf(t) values from -20. 7 to -3. 3, suggesting they were mainly derived from a metasomatized lithospheric mantle source, possibly involving some crustal contamination. The monzogranitic rocks display their zircon εHf(t) values of +0. 9 to +4. 7, indicating the acidic magma was derived from partial melting of juvenile crustal materials from the depleted mantle source. Crustal model ages (TDMC) obtained from zircon Hf isotopes of these monzogranitic rocks range from 976 to 1,215 Ma, with an average of 1,074 ± 32 Ma, possibly implying an episode of Grenvillian crustal growth in western Liaoning province. These new lines of evidence show that the NMNCC witnessed abundant magmatic activity and interaction of the crust and mantle during the Permian and Early Triassic and that the mafic magmatism was earlier than the monzogranitic activity. These findings indicate that the monzogranitic activity was the result of underplating of mafic magma with an enriched mantle source. In the context of regional Late Paleozoic to Early Mesozoic magmatic activity, the Permian magmatism occurred in an Andean-style continental margin setting when the Paleo-Asian oceanic plate was subducted beneath the NMNCC, and in this context, the Late Permian to Early Triassic magmatism may have been linked to post-collisional extension and asthenospheric upwelling, suggesting that the western Liaoning province in the NMNCC may be an eastward extension of the Late Paleozoic to Early Mesozoic active continental margin. © 2012 Springer-Verlag. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84875384344&doi=10.1007%2fs00531-012-0821-0&partnerID=40&md5=6401493c86a3bac07fec7b2459e14548
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70581
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, School of Earth and Space Sciences, Peking University, Beijing, 100871, China
Recommended Citation:
Bai X.,Liu S.,Wang W.,et al. U-Pb geochronology and Lu-Hf isotopes of zircons from newly identified Permian-Early Triassic plutons in western Liaoning province along the northern margin of the North China Craton: Constraints on petrogenesis and tectonic setting[J]. International Journal of Earth Sciences,2013-01-01,102(3)