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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Ophiolite obduction pulses as a proxy indicator of superplume events?
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Ophiolite obduction pulses as a proxy indicator of superplume events?

机译：蛇纹石引诱脉冲作为超浆体事件的替代指标？

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摘要

A major new synthesis of ophiolite geochronology and map of global Phanerozoic distribution indicates that previously noted pulses of ophiolite obduction can be linked to superplume-related tectonism. A marked cyclicity is evident in obuduction ages obtained from minerals in ophiolite metamorphic soles and obduction-related minor intrusions. this episodicity is in phase with periods of predominantly uniform polarity of the geomagnetic field, formation of massive carbon-rich deposits, sea-level highstands, and formation of large flood basalt provinces; all generally considered to be superplume proxy indicators. A key to interpreting ophiolite obduction as a further proxy is the mid-Cretaceous, superplume-associated, ocean-margin compressional deformation. During this event, thermal rejuvenation and increased buoyancy of ocean lithosphere caused arc-terrane collision, marginal-basin shoaling, backarc basin closure and ophiolite obduction. Convergent margins were placed in compression with increased coupling between subducting and overriding plates resulting in major ocean margin deformation. Being directly datable and tectonically and petrologically distinctive makes ophiolite assemblages of considerable use for identifying superplume events.
机译：蛇绿岩年代学和全球生代分布图的一个主要的新合成表明，以前提到的蛇绿岩引诱脉冲可以与超软质相关的构造运动联系起来。在从蛇绿岩变质鞋底中的矿物和与引诱相关的轻微侵入中获得的引诱年龄中，明显的周期性是明显的。这种流行与地磁场的极性主要是均匀一致，形成大量的富碳沉积物，海平面高位以及形成大型的玄武岩省处于同一阶段。所有这些通常被认为是超级代理指标。将蛇绿岩引诱解释为进一步的代名词的关键是白垩纪中部，超块状相关的洋缘压缩变形。在此事件中，热力复兴和海洋岩石圈浮力的增加引起了弧-地碰撞，边际盆地浅滩化，后弧盆地封闭和蛇绿岩阻塞。会聚边缘处于压缩状态，俯冲板块与上覆板块之间的耦合增加，导致主要的海洋边缘变形。由于直接数据可辨，构造和岩石学上的独特性，使得蛇绿岩组合物可用于识别超级岩浆事件。

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