[MZZ55-P02] Consideration on quarrying history of Rokko Granites on the basis of historical booklets “Meisho-zue” .
Keywords:granite, magnetic susceptibility, building stone, booklet of historic sites, debris flow
Medium to coarse-grained hornblende bearing biotite granites distributed in Rokko Mountains were quarried for building stones in ancient time. Measurement of magnetic susceptibility and observation of rock facies have revealed that many tombstones of 13th to 16th century made by Rokko Granites are widely distributed in coastal areas of western Japan. But main quarries have been moved to islands and coastal area of Inland Sea from Rokko Mountains after 17th century.
Quarrying history of Rokko Granites are shown by historical booklets so-called “Meisho-zue” in 18th century. Granitc stones from Rokko Mountains have been originally called Mikage-Ishi, because they were shipped off from Mikage in Kobe. Explanatory note of “Meisho-zue” indicates that quarrying area moved from seaside area to deep in mountains during Edo Period. Furthermore, another granitic stones from some area located far apart from the Rokko Mountains are included in item on Mikage-ishi in “Meisho-zue”. This fact indicates that Mikage-ishi is not only proper noun of the granitic stones in Rokko Mountains but common noun of granitic stones at least late 18th century.
Geological study shows that some granitic sones have been quarried in sediments by debris flow. On the other hand, debris flow frequently occurred throughout history at the foot area of Rokko Mountains.
Frequent debris flow brought large amount of granitic stones near seaside area, and such granite stones were shipped off and widely distributed in various places. As a result, Mikage-ishi changed from proper noun of Rokko Granite to common noun of granitic stones at 17th to 18th century.
Quarrying history of Rokko Granites are shown by historical booklets so-called “Meisho-zue” in 18th century. Granitc stones from Rokko Mountains have been originally called Mikage-Ishi, because they were shipped off from Mikage in Kobe. Explanatory note of “Meisho-zue” indicates that quarrying area moved from seaside area to deep in mountains during Edo Period. Furthermore, another granitic stones from some area located far apart from the Rokko Mountains are included in item on Mikage-ishi in “Meisho-zue”. This fact indicates that Mikage-ishi is not only proper noun of the granitic stones in Rokko Mountains but common noun of granitic stones at least late 18th century.
Geological study shows that some granitic sones have been quarried in sediments by debris flow. On the other hand, debris flow frequently occurred throughout history at the foot area of Rokko Mountains.
Frequent debris flow brought large amount of granitic stones near seaside area, and such granite stones were shipped off and widely distributed in various places. As a result, Mikage-ishi changed from proper noun of Rokko Granite to common noun of granitic stones at 17th to 18th century.