| 完达山造山带原型盆地及可能的造山机制 |
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| 引用本文： | 张传恒,张世红.完达山造山带原型盆地及可能的造山机制[J].现代地质,1999,13(1):25-31. |
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| 作者姓名： | 张传恒 张世红 |
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| 作者单位： | China University of Geosciences，Beijing，100083 |
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| 摘 要： | 完达山造山带是东亚环太平洋构造带的重要组成部分，是中国北方唯一的中生代深水活动类型沉积建造出露区。三叠纪—侏罗纪硅质岩－碎屑岩系构成了这个造山带的主体，其沉积序列总体表现为一向上变浅、碎屑颗粒变粗的沉积旋回，其中的硅质岩、泥岩稀土元素以Ｃｅ的正异常为特征；砂岩构架颗粒成分与典型的弧前盆地相同。这些特征表明，完达山造山带三叠纪—侏罗纪的原型盆地是东亚陆缘区弧前盆地的组成部分。构造解析结果进一步揭示，造山带只发育一期透入性的变形构造，与增生杂岩的变形序列明显不同。基于上述结论并结合区域构造分析结果提出，完达山造山带的隆升主要是中生代东亚陆缘型岩浆弧东移、本区卷入科迪勒拉型造山带所致。
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| 关 键 词： | 完达山造山带 原型盆地 造山机制 |
PROTO BASIN AND POSSIBLE OROGENIC MECHANISM OF WANDASHAN OROGENIC BELT |
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| Zhang Chuanheng,Zhang Shihong.PROTO BASIN AND POSSIBLE OROGENIC MECHANISM OF WANDASHAN OROGENIC BELT[J].Geoscience——Journal of Graduate School,China University of Geosciences,1999,13(1):25-31. |
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| Authors: | Zhang Chuanheng Zhang Shihong |
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| Abstract: | Wandashan orogenic belt, an important integral part of East Asia circum Pacific tectonic belt, is only one exposure area of Mesozoic deep water mobile sedimentary formation in North China, and of special importance to understand Mesozoic tectonics of the eastern part of China. The middle Triassic to Jurassic strata, the principal part of Wandashan orogenic belt, constitute an upward shoaling sedimentary cycle with silicalite overlain by turbidite and shallow water detrital rocks. The silicalite and interlayered mudstone are characterized by developing positive w (Ce) anomaly, indicating a continental margin. Triangular diagram of the sandstone clastic compositions further suggests deposited in a forearc basin. This implies that the T 2 J proto basin is a part of the forearc basin developed in East Asia Andes active continental margin. There is one generation of penetrating structures in Wandashan orogenic belt, characterized by upright chevron folds with a nearly SN tectonic line and small scale thrust. This is different from the structural style in accretionary prisms. Based on the above new geologic facts and combined with regional geologic data such as the magmatic activity, it is put forward that Wandashan forearc basin was involved in the retroarc fold thrust belts from 100 Ma, forming a orogenic belt. |
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| Keywords: | Wandashan orogenic belt proto basin orogenic mechanism |
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