本郷付近における船津花崗岩類の接触現象

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Funatsu Granitic Rocks are collective name given to Triassic-Jurassic granitic rocks exposed in the Hida Belt and Hida Marginal Belt. They are composed of two rock-types, the earlier one, Shimonomoto type mainly of quartz diorite, tonalite and granodiorite, and the later one, Funatsu type mainly of granite and granodiorite. They are intruded in to the Paleozoic formations and also into the Hida Metamorphic Rocks. The contact effect to the Hida Metamorphic Rocks is often difficult to discriminate from the metamorphism of the Hida Metamorphic Rocks. However, the contact phenomena to the Paleozoic formations are relatively simple in the sense of non-multiple metamorphism. The contact to the Paleozoic formations is well observable in the Hongo area. The contact in the Hongo area, though relatively simple, is enough complicated, indicating various fashions of contact phenomena. The granitic rocks in contact with the Paleozoic formations are not always border facies but are various, tonalite and granodiorite of the Shimonomoto type, and granite, granodiorite and aplite of the Funatsu type. The contact of the granitic rocks to the Paleozoic formations are mostly in minor fault or slip along which granitic rocks are more or less mylonitized. In other cases, intrusive contacts of magmatic granite and semi-solidified granite mylonite are observed. The contact metamorphism goes up to the high- or intermediate part of the amphibolite facies but the metamorphic aureole is relatively narrow never exceeding 400 m in width. The reason for these complicated characters of the contact of the Funatsu Granitic Rocks is not yet elucidated but is left to further study.
日本地質学会の論文
1979-09-20

本郷付近における船津花崗岩類の接触現象

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