^40Ar/^39Ar geochronological constraints on syn-orogenic strike-slip movement of Tan-Lu fault zone |
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作者姓名: | W.J.Dunlap C.Teyssier |
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作者单位: | Research School of Earth Sciences,Australian National University,Acton ACT 0200 Australia,Department of Geology and Geophysics,University of Minnesota Minneapolis MN55455 USA |
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摘 要: | Two phases of sinistral strike-slip ductile shear belts occur on the eastern margin of the Dabie orogenic belt. A muscovite ~(40)Ar/~(39)Ar plateau age of 128 Ma was obtained from mylonite in the later ductile shear zone. Three muscovite samples separated from mylonites of 3 localities in the earlier ductile shear belts yield ~(40)Ar/~(39)Ar plateau ages of 192.5±0.7 Ma, 189.7±0.6 Ma and 188.7±0.7 Ma, respectively. They are interpreted as cooling ages of the earlier sinistral strike-slip deformation. It is suggested that left-lateral displacement of the Tan-Lu fault zone started in a late stage of the collision orogeny in the Dabie-Sulu orogenic belt between the North and South China plates. Therefore, the earlier Tan-Lu fault zone was syn-orogenic strike-slip tectonics. The fault zone was used again for sinistral displacement during tectonic activities of peri-Pacific regime in Early Cretaceous. It is proposed that the fault zone occurred as a transform fault during the orogenic process.
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关 键 词: | 氩 地质年代学 走向滑距运动 断层带 |
收稿时间: | 2 November 2003 |
修稿时间: | 2003-12-03 |
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