Two thermal structures in the Ryoke metamorphic belt of the Dando-san area, Aichi Prefecture
Two thermal structures in the Ryoke metamorphic belt of the Dando-san area, Aichi Prefecture
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爱知县丹岛山地区 Ryoke 变质带的两个热构造
DOI：
10.5575/geosoc.2014.0030
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Yukari Igarashi
中科院分区：
文献类型：
--
作者：
A. Miyake;K. Yokoe;Bungo Suzuki;Yukari Igarashi
在爱知县丹岛山地区广泛分布着龙屋变质带的变火山岩、变砂岩和变黑岩。这些岩石在该地区的西南部被Kamihara英云闪长岩（旧Ryoke花岗岩类）侵入，在北方至东北部被Busetsu花岗岩（新Ryoke花岗岩类）侵入。变质带的制图，基于变岩矿物组合，揭示了两个大规模的热结构无关的花岗岩类在该地区的分布。第一次构造变质程度从中部向东南方向递增，第二次构造变质程度从中部向西北方向递增。根据不含钾长石的红柱石的构造间生长，并与位于西南方向的洪丘山地区的变质分带相比较，认为第一热构造是在Ryoke区域变质作用中形成的。与此相反，在西北部的构造后红柱石与钾长石共存的出现表明，第二热构造是在区域变质作用后的低压条件下产生的。这一变质事件可能产生了在温度迅速上升过程中形成的细粒高级变质岩。
Metapelite, metapsammite, and metachert of the Ryoke metamorphic belt are widely distributed in the Dando-san area, Aichi Prefecture. These rocks are intruded by the Kamihara tonalite (Older Ryoke granitoid) in the southwestern part of the area and by the Busetsu granite (Younger Ryoke granitoid) in the northern to north-eastern part. The mapping of metamorphic zones, based on metapelite mineral assemblages, reveals two large-scale thermal structures unrelated to the distribution of granitoids in the area. The metamorphic grade increases from the central part of the area toward the southeast in the first structure, and from the center toward the northwest in the second one. The first thermal structure is con-sidered to have formed during Ryoke regional metamorphism, on the basis of inter-tectonic growth of andalusite without K-feldspar, and from comparison with the metamorphic zonation in the Hongu-san area located in the south-western direction. In contrast, the occurrence of post-tectonic andalusite coexisting with K-feldspar in the northwestern part of the area shows that the second thermal structure was produced under lower pressure conditions after regional metamorphism. This metamorphic event may have produced fine-grained, high-grade metamorphic rocks that formed during a rapid increase in temperature.
日本西南部 Ryoke 变质带的热演化：构造和数值模拟：评论
DOI：
--
发表时间：
2002
期刊：
The Island Arc 11
影响因子：
--
作者：
Yasutaka Y;Wallis S;Ikeda T
通讯作者：
Ikeda T