9:45 AM - 10:00 AM
[MIS22-04] Subaqueous volcanic rocks as the object for the geo tourism-related to NHK Buratamori and geoparks
Keywords:Subaqueous volcanic rocks, Pillow lava, Hyaloclastite, Geopark, NHK Buratamori, Muroran Etomo Peninsula
Recently, Japanese geologic term "Suirei-hasaigan"(hyaloclastite) or "Suirei-hasaiyougan" as a composition of subaqueous volcanoes has been known to be public by NHK TV Program such as “NHK Buratamori Atami, Shiretoko and Muroran” and the other programs. Such subaqueous volcanic rocks have been shown in many geoparks (Fig.1) in Japan: particularly, pillow lavas are exhibited in geoparks of Shimokita, Oga, Sanriku, Sado, Itoigawa, Shimonita, Simane Peninsula, Seiyo, Muroto etc., but hyaloclastites ("Suirei-hasaigan" or "Suirei-hasaiyougan") are displayed only in Izu Peninsula, San-in and Shimane Hanto Shinjiko geopark.
During 1970 to 1980’s the discussions and studies on the genesis of “Kuroko” (Sulphide Ore Deposits) had been popular in Japan, but later almost of the metal mines have been abolishid and then the researching and studies have been declined.
On the otherhand, in engineering geological fields, such as highway and tunnel construction, investigation on the subaqueous volcanic rocks has been attention, for instance, rock classification is usually done by mechanical classification, however, the subaqueous volcanic rocks display variable and heterogeneous facies differently from the other rocks, namely the classification needs knowledges of the occurrence of the rocks. Namey, such subaqueous volcanic rocks show different physical properties such as porosity, alteration and weathering processes, from subaerial ones and others. In terms of disaster problem, these subaqueous volcanic rocks have been attention also. For examples, 1971 Shizuoka Ohkuzure Rock Falls and 1996 Hokkaido Shakotan Toyohama Rock falls generated from the subaqueous volcanic rocks.
In terms of basic geology, Dr Kazuo Amano, proposed “Green Tuff Renaissance” meaning re-evaluation of the Neogene tectonics studies which have been studied much in the 1970’s in Japan. While, in the field of current oceanography, the sea bottom black smoke related to marine resources, has necessity of knowledge of Black Ore Deposits (KurokoVMS) during 1970-1980’s. While, the new technology such as drone (UAV) mapping of seashore bench, and digital exploring of the current ocean volcanology needs much knowledge of ancient subaqueous volcanic rocks.
Backbones of the Japanese islands were formed by subaqueous volcanism since the 10M, therefore one to thirds of the Japanese islands have been developed on the basement of the subaqueous volcanic rocks.
In this presentation, We review the terminology of the subaqueous volcanic rocks such as hyaloclastite, and report aerial and cruising geo-tour for Muroran Etomo Peninsula (Fig.1) composed of variable shapes of felsic subaqueous volcanic rocks.
During 1970 to 1980’s the discussions and studies on the genesis of “Kuroko” (Sulphide Ore Deposits) had been popular in Japan, but later almost of the metal mines have been abolishid and then the researching and studies have been declined.
On the otherhand, in engineering geological fields, such as highway and tunnel construction, investigation on the subaqueous volcanic rocks has been attention, for instance, rock classification is usually done by mechanical classification, however, the subaqueous volcanic rocks display variable and heterogeneous facies differently from the other rocks, namely the classification needs knowledges of the occurrence of the rocks. Namey, such subaqueous volcanic rocks show different physical properties such as porosity, alteration and weathering processes, from subaerial ones and others. In terms of disaster problem, these subaqueous volcanic rocks have been attention also. For examples, 1971 Shizuoka Ohkuzure Rock Falls and 1996 Hokkaido Shakotan Toyohama Rock falls generated from the subaqueous volcanic rocks.
In terms of basic geology, Dr Kazuo Amano, proposed “Green Tuff Renaissance” meaning re-evaluation of the Neogene tectonics studies which have been studied much in the 1970’s in Japan. While, in the field of current oceanography, the sea bottom black smoke related to marine resources, has necessity of knowledge of Black Ore Deposits (KurokoVMS) during 1970-1980’s. While, the new technology such as drone (UAV) mapping of seashore bench, and digital exploring of the current ocean volcanology needs much knowledge of ancient subaqueous volcanic rocks.
Backbones of the Japanese islands were formed by subaqueous volcanism since the 10M, therefore one to thirds of the Japanese islands have been developed on the basement of the subaqueous volcanic rocks.
In this presentation, We review the terminology of the subaqueous volcanic rocks such as hyaloclastite, and report aerial and cruising geo-tour for Muroran Etomo Peninsula (Fig.1) composed of variable shapes of felsic subaqueous volcanic rocks.