The Wutaishan orogenic belt within the Shanxi Province, northern China: a record of late Archaean collision tectonics
The Wutaishan orogenic belt within the Shanxi Province, northern China: a record of late Archaean collision tectonics
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DOI：
10.1016/0301-9268(95)00071-2
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发表时间：
1996-05
影响因子：
3.8
通讯作者：
Kaiyi Wang;Jiliang Li;Jie Hao;Jianghai Li;Zhou Shaoping
中科院分区：
文献类型：
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作者：
Kaiyi Wang;Jiliang Li;Jie Hao;Jianghai Li;Zhou Shaoping
北方山西省东北部的中生代地壳主要由三个不同的片麻岩组成：北部的衡山片麻岩和东南部的富平片麻岩，以及介于其间的五台山带的低变质片麻岩。2.5Ga的北台弧杂岩构成五台山带的主要部分，被解释为碰撞前岩浆弧。北台弧与阜平弧之间存在一个边缘海盆。弧前碰撞阶段，沿着阜平坳陷西缘的被动边缘沉积，在边缘海盆闭合后成为前陆褶皱冲断带。海底残余物沿着北台岛弧与阜平岛弧之间的缝合带呈混杂带分布。与此同时，在1.25Ga，弧后洋壳开始俯冲到衡山洋壳之下，衡山洋壳与弧和阜平洋壳发生碰撞。在衡山弧与北台弧之间，有一些被肢解的海底岩石作为弧后混杂岩带保存下来。“五台山造山运动”一词应保留在2600 - 2450 Ma的过程中。
The Archaean crust of northeastern Shanxi Province, northern China, is dominated by three distinct terranes: the high-grade gneiss terranes Hengshan in the north and Fuping in the southeast, and the intervening low-grade terrane of the Wutaishan belt. The 2.5 Ga Beitai arc complex which constitutes the major part of the Wutaishan belt is interpreted as a pre-collision magmatic arc. There was a marginal-sea basin between the Beitai arc and the Fuping terrane. At the fore-arc collision stage the passive margin deposits which occurred along the western margin of the Fuping terrane became a foreland fold-thrust belt after the closure of the marginal-sea basin. The remnants of sea floor occur as a mélange zone along the suture zone between the Beitai arc and Fuping terrane. Nearly at the same time, at ∼ 2.5 Ga, the back-arc oceanic lithosphere started to subduct beneath the Hengshan terrane, then the Hengshan terrane came into collision with the arc and the Fuping terrane. Some dismembered sea-floor rocks are preserved as a back-arc mélange zone between the Hengshan terrane and the Beitai arc. The term ‘Wutaishan Orogeny’ should be reserved for the processes which lasted from 2600 to 2450 Ma.