DOI: 10.1007/s00531-013-0931-3
Scopus记录号: 2-s2.0-84893773570
论文题名: Nature and timing of the Solonker suture of the Central Asian Orogenic Belt: Insights from geochronology and geochemistry of basic intrusions in the Xilin Gol Complex, Inner Mongolia, China
作者: Li Y. ; Zhou H. ; Brouwer F.M. ; Xiao W. ; Wijbrans J.R. ; Zhao J. ; Zhong Z. ; Liu H.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期: 1 起始页码: 41
结束页码: 60
语种: 英语
英文关键词: 40Ar/39Ar
; Basic intrusion
; Central Asian Orogenic Belt
; Geochemistry
; LA-ICPMS
; Xilin Gol Complex
Scopus关键词: accretion
; amphibolite
; argon-argon dating
; geochemistry
; geochronology
; hornblende
; igneous intrusion
; inductively coupled plasma method
; mass spectrometry
; orogenic belt
; suture zone
; China
; Nei Monggol
; Solonker Suture Zone
; Xilingol
英文摘要: The Solonker suture zone of the Central Asian Orogenic Belt (CAOB) records the final closure of the Paleo-Asian Ocean. The nature and timing of final collision along the Solonker suture has long been controversial, partly because of an incomplete record of isotopic ages and differing interpretations of the geological environments of key tectonic units. The Xilin Gol Complex, consisting of strongly deformed gneisses, schists and amphibolites, is such a key tectonic unit within the CAOB. Lenticular or quasi-lamellar amphibolites are dispersed throughout the complex, intercalated with biotite-plagioclase gneiss. Both rock types experienced amphibolite-facies metamorphism. The protolith of the amphibolite is a basic rock that intruded into the biotite-plagioclase gneiss at 319 ± 4 Ma based on LA-ICPMS zircon U-Pb dating. The basic intrusion was sourced from a modified magma that experienced crystal fractionation and was admixed with slab-derived fluids. The slab-derived fluids, which formed during Early Paleozoic oceanic subduction along the north-dipping Sonidzuoqi-Xilinhot subduction zone, mixed with the magma source and produced subduction-related geochemical signatures superimposed on volcanic arc chemistry. After Early Paleozoic oceanic subduction and arc-continent collision, a transient stage of extension occurred between 313 and 280 Ma in the Sonidzuoqi-Xilinhot area. Deformation and recrystallization during the switch from compression to extension and reheating by the later magmatic intrusions reset the isotope systems of minerals in the Xilin Gol Complex, recorded by a 312.2 ± 1.5 Ma biotite 40Ar/39Ar age from biotite-plagioclase gneiss, a 309 ± 12 Ma zircon intercept age and a 307.5 ± 3.5 Ma hornblende 40Ar/39Ar age from amphibolites in the complex. There was an arc/forearc-related marine basin at the southern margin of the Xilin Gol Complex during the Permian. The closure of the oceanic basin led to Late Paleozoic-Middle Triassic north-dipping subduction beneath the Xilin Gol Complex and induced the amphibolite-facies metamorphism of the complex. The final suturing of the Solonker zone occurred from 269 to 231 Ma. This latest amphibolite-facies metamorphism with pressures of 0.31-0.39 GPa and temperatures of 620-660 °C was recorded at 263.4 ± 1.4 Ma to the Xilin Gol Complex, as indicated by the hornblende 40Ar/39Ar age from the amphibolites, as well as several zircon ages of 260 ± 3-231 ± 3 Ma. The Xilin Gol Complex documented the progressive accretion of a single, long-lived subduction system at the southern margin of the south Mongolian microcontinent from the Early Paleozoic (~452 Ma) to Middle Triassic (~231 Ma). The CAOB shows protracted collision prior to final suturing. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893773570&doi=10.1007%2fs00531-013-0931-3&partnerID=40&md5=7dc399dc1c26a929f3fe105bbfd7ca8d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70416
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: China University of Geosciences, No. 388 Lumo Road, Hongshan District, Wuhan, 430074, China; Deep Earth and Planetary Sciences, Department of Earth Sciences, VU University Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, Netherlands; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
Recommended Citation:
Li Y.,Zhou H.,Brouwer F.M.,et al. Nature and timing of the Solonker suture of the Central Asian Orogenic Belt: Insights from geochronology and geochemistry of basic intrusions in the Xilin Gol Complex, Inner Mongolia, China[J]. International Journal of Earth Sciences,2014-01-01,103(1)