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＜departmental bulletin paper＞
Petrography of building stones used for a stone-wall of the Kami-no-hashi Gateway of Fukuoka Castle, and considerations of their origins.
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| Abstract | Researching the origin of stone materials used in the Fukuoka Castle is important for clarifying the movement and transportation capacity of supplies at the time of the castle building, and will lead ...to understanding the details of its construction history. Furthermore, it will supply basic information for considering the political background such as the financial power of the owner of the castle during the construction and the influence on the surrounding area. In order to research the origin of the rock used for the stone wall of Fukuoka Castle, therefore, the available rock samples from the walls were observed microscopically. For most of them, their chemical composition were analyzed by XRF. These results were compared with the petrographical data and chemical compositions of the rock samples of the possible origin. The building stones used for the stone-wall of the Kami-no-hashi Gateway of Fukuoka Castle include granitic rocks primarily and mafic plutonic rocks secondarily, together with small amount of alkali basalt, serpentinite, conglomerate, sandstone, and silicified wood. Most of the granitic rocks have leucocratic surface with pale-pink colored porphyritic potassium feldspar, with minor amounts of dark brown tabular crystals and columnar crystals with dark green color, while a few of the rocks had grayish surface. The leucocratic granitic rocks were classified as common hornblende-biotite granodiorite to adamellite, in the QFM diagram. On the other hand, most of the mafic plutonic rocks were grouped into common hornblende quartz diorite. Major element compositions of the granitic rocks and mafic plutonic rocks used for the stone-wall are similar to those of the Shikanoshima granodiorites and Shikanoshima basic rocks, respectively, occurred on the north and west areas of the Hakata Bay, Fukuoka City. The stone-wall of the Kami-no-hashi Gateway of Fukuoka Castle also includes alkali basalt and serpentinite which have the same chemical composition as those found around the Hakata Bay area, similar to the plutonic rocks. These occurrences and chemical signatures suggest that most of the building stones of the wall were probably provided from the exposures of Shikanoshima granodiorites and Shikanoshima basic rocks of the northwestern Hakata Bay, and minor various types of rocks were supplementary from neighbor areas of the bay.show more |
| Table of Contents | Ⅰ．はじめに Ⅱ．福岡城築城の時代背景 Ⅲ．博多湾周辺の地質 Ⅳ．上之橋御門石垣石材の調査・分析結果 Ⅴ．上之橋御門石垣の石材産地についての考察 Ⅵ．結語 |
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| Created Date | 2021.03.24 |
| Modified Date | 2023.12.06 |