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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 >Some remarks on deformation and P-T conditions of the Cretaceous regional metamorphic belts in southwest Japan: reply to comment by M. Brown on 'Thermal effects of ridge subduction and its implications for the origin of granitic batholith and paired
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Some remarks on deformation and P-T conditions of the Cretaceous regional metamorphic belts in southwest Japan: reply to comment by M. Brown on 'Thermal effects of ridge subduction and its implications for the origin of granitic batholith and paired

机译：关于日本西南部白垩纪区域变质带变形和P-T条件的一些评论：回应M. Brown的评论“山脊俯冲的热效应及其对花岗岩基岩和成因的影响”

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摘要

Deformation and P-T conditions of the Cretaceous Ryoke-Sambagawa metamorphic belts have been analyzed based on recent numerical modeling of plastic flow at convergent plate boundaries. The analyses suggest that a three-dimensional corner flow in the forearc wedge associated with subduction with moderate obliquity (more than 45° for the angle between the subduction direction and the trench) can explain the observed prolate strain: a large strain (more than 10), with the angle of 10-30° between the elongation axis and the strike of the regional metamorphic belts, is attributed to a combination of (1) stretching in the subduction direction above the subducting plate, and (2) stretching and rotation towards the along-trench direction at the wedge corner. Therefore, the observed large strain is not a consequence of a significant lateral displacement of the two plates. Based on the analyses, the contemporaneous Ryoke (low-P/T)-Sambagawa (high-P/T) metamorphic belts are suggested to have been formed within a single trench-forearc system by a series of events, not by accidental amalgamation of two distinct terranes. The contrasting low- and high-P/T metamorphic conditions are demonstrated to be simultaneously achieved in the forearc region during the dynamic flow associated with ridge subduction, where a large temperature gradient is produced.
机译：根据最近在汇聚板块边界塑性流动的数值模型，分析了白垩纪Ryoke-Sambagawa变质带的变形和P-T条件。分析表明，前倾楔中的三维角流与俯冲适度倾角相关（俯冲方向与沟槽之间的夹角大于45°）可以解释所观察到的长形应变：大应变（大于10 ），伸长轴与区域变质带走向之间的夹角为10-30°，这是由于以下因素的组合：（1）在俯冲板上方沿俯冲方向伸展，以及（2）伸展并向楔角处的沿沟槽的方向。因此，观察到的大应变不是两个板的明显横向位移的结果。根据分析，建议通过一系列事件在单个沟槽-前臂系统内形成同时代的Ryoke（低P / T）-桑巴川（高P / T）变质带，而不是偶然地合并两个不同的地形对比的低P / T和高P / T变质条件被证明是在与岭俯冲相关的动态流动过程中同时在前臂区域中实现的，在该区域中会产生较大的温度梯度。

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