| 柴达木北缘达肯大坂群与滩间山群的接触关系 |
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| 引用本文： | 夏元祁.柴达木北缘达肯大坂群与滩间山群的接触关系[J].地层学杂志,1996,20(2):123-127. |
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| 作者姓名： | 夏元祁 |
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| 摘 要： | 柴达木北缘古元古界达肯大坂群片麻岩系与上奥陶统滩间山群绿片岩系之间先存的角度不整合已经受到后期滑脱构造变形的强烈改造,是一种变质岩区特有的构造接触关系——隐蔽不整合,从而明确"过渡带"片岩系实质上是一条变质滑脱带,是伸展体制下低角度正断层沿不整合面滑脱拆离的产物,其主体应划归达肯大坂群。
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| 关 键 词： | 隐蔽不整合 滑脱构造 滩间山群 达肯大坂群 柴达木 |
Contact relation between the Tanjianshan Group and Dakendaban Group on northern margin of Qaidam |
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| Abstract: | This paper briefly deals with the contact relation between the greenschist of the Tanjianshan Group of the Upper Ordovician Series and the gneiss of the Dakendaban Group of the Paleoproterozoic Erathem on the northern margin of the Qaidam Basin.Owing to the decollement occurring in later stage,the early angular uncon- formity has been resplaced by the blind unconformity——a typical tectonic contact relation of the metamorphic rock area.Thus the schist series of"transition zone"is in essence a metamorphic decollement zone,resulting from the detachment of the low-angle normal fault along the unconformity interface under the extensional tectonic regime.The schist series of the"transition zone"belongs to the Dakendaban Group. |
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| Keywords: | blind unconformity decollement Tanjianshan Group Dakendaban Group Qaidam |
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