Detrital Zircon U-Pb Geochronology from Greywackes in the Niujuanzi Ophiolitic Mélange, Beishan Area, NW China: Provenance and Tectonic Implications
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摘要
The Niujuanzi ophiolitic mélange represents the remnant of oceanic crust between the Dunhuang massif and Mingshui-Hanshan massif. Greywacke from different tectonic slices in the Niujuanzi ophiolitic mélange were analyzed for detrital zircon U-Pb geochronology, trace elements and whole-rock trace elements to infer their provenance and the evolution of the Niujuanzi Ocean. Sample N-76 s containing Carboniferous spores has the youngest zircon age of 323 Ma, while sample N-85 s without fossils has the youngest zircon age of 449 Ma. The two samples were deposited no earlier than 323 and 449 Ma, respectively. The greywackes are depleted in large ion lithophile elements, and are relatively enriched in high field strength elements. The age spectra and trace element concentrations indicate that the sediments may have been deposited near the trench. The Hf, U, and Yb contents of zircons from sample N-76 s vary widely, whereas those from sample N-85 s have a narrow range. Sample N-76 s contains both continental and oceanic zircons, while sample N-85 s contains only continental zircons. The sediments were derived from the continental arc and accretionary wedge. The Paleozoic oceanic crust zircons have ages of 430–500 Ma, indicating the timing of the expansion of the HongliuheNiujuanzi-Xichangjing Ocean expansion. The oldest Paleozoic continental zircon has an age of 470 Ma, suggesting that the northward subduction of the oceanic crust may have started at that time.
The Niujuanzi ophiolitic mélange represents the remnant of oceanic crust between the Dunhuang massif and Mingshui-Hanshan massif. Greywacke from different tectonic slices in the Niujuanzi ophiolitic mélange were analyzed for detrital zircon U-Pb geochronology, trace elements and whole-rock trace elements to infer their provenance and the evolution of the Niujuanzi Ocean. Sample N-76 s containing Carboniferous spores has the youngest zircon age of 323 Ma, while sample N-85 s without fossils has the youngest zircon age of 449 Ma. The two samples were deposited no earlier than 323 and 449 Ma, respectively. The greywackes are depleted in large ion lithophile elements, and are relatively enriched in high field strength elements. The age spectra and trace element concentrations indicate that the sediments may have been deposited near the trench. The Hf, U, and Yb contents of zircons from sample N-76 s vary widely, whereas those from sample N-85 s have a narrow range. Sample N-76 s contains both continental and oceanic zircons, while sample N-85 s contains only continental zircons. The sediments were derived from the continental arc and accretionary wedge. The Paleozoic oceanic crust zircons have ages of 430–500 Ma, indicating the timing of the expansion of the HongliuheNiujuanzi-Xichangjing Ocean expansion. The oldest Paleozoic continental zircon has an age of 470 Ma, suggesting that the northward subduction of the oceanic crust may have started at that time.
The Niujuanzi ophiolitic mélange represents the remnant of oceanic crust between the Dunhuang massif and Mingshui-Hanshan massif. Greywacke from different tectonic slices in the Niujuanzi ophiolitic mélange were analyzed for detrital zircon U-Pb geochronology, trace elements and whole-rock trace elements to infer their provenance and the evolution of the Niujuanzi Ocean. Sample N-76 s containing Carboniferous spores has the youngest zircon age of 323 Ma, while sample N-85 s without fossils has the youngest zircon age of 449 Ma. The two samples were deposited no earlier than 323 and 449 Ma, respectively. The greywackes are depleted in large ion lithophile elements, and are relatively enriched in high field strength elements. The age spectra and trace element concentrations indicate that the sediments may have been deposited near the trench. The Hf, U, and Yb contents of zircons from sample N-76 s vary widely, whereas those from sample N-85 s have a narrow range. Sample N-76 s contains both continental and oceanic zircons, while sample N-85 s contains only continental zircons. The sediments were derived from the continental arc and accretionary wedge. The Paleozoic oceanic crust zircons have ages of 430–500 Ma, indicating the timing of the expansion of the HongliuheNiujuanzi-Xichangjing Ocean expansion. The oldest Paleozoic continental zircon has an age of 470 Ma, suggesting that the northward subduction of the oceanic crust may have started at that time.
引文
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Dai,S.,Fang,X.M.,Zhang,X.,et al.,2003.Island Arc North of the Tarim-SK Plate:The Geology and Geochemistry of Gongpoquan Group.Journal of Lanzhou University(Natural Sciences),39(4):80-87(in Chinese with English Abstract)
Dai,W.J.,2011.The Formation Background and Tectonic Significance of the Ophiolite Mélange in the Niujuanzi Area,Beishan,Gansu Province.J.Mineral.Petrol.,31(4):44-51(in Chinese with English Abstract)
Dickinson,W.R.,Gehrels,G.E.,2009.Use of U-Pb Ages of Detrital Zircons to Infer Maximum Depositional Ages of Strata:A Test against a Colorado Plateau Mesozoic Database.Earth and Planetary Science Letters,288(1/2):115-125.https://doi.org/10.1016/j.epsl.2009.09.013
Dilek,Y.,Furnes,H.,2011.Ophiolite Genesis and Global Tectonics:Geochemical and Tectonic Fingerprinting of Ancient Oceanic Lithosphere.Geological Society of America Bulletin,123(3/4):387-411.https://doi.org/10.1130/b30446.1
Dinis,P.,Andersen,T.,Machado,G.,et al.,2012.Detrital Zircon U-Pb Ages of a Late-Variscan Carboniferous Succession Associated with the Porto-Tomar Shear Zone(West Portugal):Provenance Implications.Sedimentary Geology,273/274:19-29.https://doi.org/10.1016/j.sedgeo.2012.06.007
Fedo,C.M.,Sircombe,K.N.,Rainbird,R.H.,2003.Detrital Zircon Analysis of the Sedimentary Record.Reviews in Mineralogy and Geochemistry,53(1):277-303.https://doi.org/10.2113/0530277
Feng,J.C.,Zhang,W.,Wu,T.R.,et al.,2012.Geochronology and Geochemistry of Granite Pluton in the North of Qiaowan,Beishan Mountain,Gansu Province,China and Its Geological Significance.Acta Scientiarum Naturalium Universitatis Pekinensis,48(1):61-70(in Chinese with English Abstract)
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Grimes,C.B.,John,B.E.,Kelemen,P.B.,et al.,2007.Trace Element Chemistry of Zircons from Oceanic Crust:A Method for Distinguishing Detrital Zircon Provenance.Geology,35(7):643.https://doi.org/10.1130/g23603a.1
Guo,C.T.,Gao,J.,Li,Z.,et al.,2017.Depositional and Provenance Records of Upper Devonianto Lower Carboniferous Sandstones from Bachu Area,Northwestern Tarim Basin:Implications for Tectonic Evolution.Earth Science-Jorunal of China University of Geosciences,42(3):421-434.https://doi.org/10.3799/dqkx.2017.032(in Chinese with English Abstract)
Guo,Z.J.,Shi,H.Y.,Zhang,Z.C.,et al.,2006.The Tectonic Evolution of the South Tianshan Paleo-Oceanic Crust Inferred from the Spreading Structures and Ar-Ar Dating of the Hongliuhe Ophiolite,NW China.Acta Petrologica Sinica,22(1):95-102(in Chinese with English Abstract)
Han,Y.G.,Zhao,G.C.,Sun,M.,et al.,2015.Paleozoic Accretionary Orogenesis in the Paleo-Asian Ocean:Insights from Detrital Zircons from Silurian to Carboniferous Strata at the Northwestern Margin of the Tarim Craton.Tectonics,34(2):334-351.https://doi.org/10.1002/2014tc003668
Hoskin,P.W.O.,Schaltegger,U.,2003.The Composition of Zircon and Igneous and Metamorphic Petrogenesis.Reviews in Mineralogy and Geochemistry,53(1):27-62.https://doi.org/10.2113/0530027
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