Kanzaka Mudstone Member

[ Top ] [ Japanese ]

Kanzaka Mudstone Member (Matsuda and Mizuno, 1955) Ozaki and Sugiyama, 2018

Type locality: Ichinose station - Kanzaka pass, Minobu city, Minamikoma county, Yamanashi prefecture
Coherent formation
Miocene
Intruded by: Hornblende andesite, Basalt - Dolerite dykes - sills

Sedimentary facies (Bottom, Basalt): Sheet flow
Depth of water (Upper): Abbyssal (shallower than CCD)
Depth of water (Lower): Abbyssal (deeper than CCD)
Lithofacies: Mudstone
Lithofacies (Minor): Sandstone, Mudstone-dominant interbedded sandstone and mudstone, Tuffaceous sandstone, Dacite tuff
Lithofacies (Bottom): Alkaline olivine basalt, Dolerite
Lithofacies (Bottom): Basalt lava, Volcanic breccia, Hyaloclastite
Sedimentary structures: Slump structure, Graded bedding, Parallel stratification, Cross stratification

Thickness: ca. 300 - 850 m
Thickness (Basalt): Several - some dozen m
Upper limit: Interfingered (Wadaira Tuff Member), Conformity (Kamiisshiki Volcanic Breccia Member, Tsukimibashi Volcaniclastic Member)
Lower limit: Conformity (Furusekigawa Formation)

Tokiwa Formation
[ Upper ]
--------------
Byobuiwa Tuff Member
--------------
Deguchi Sandstone and Mudstone Member
--------------
Tsukimibashi Volcaniclastic Member
--------------
Kamiisshiki Volcanic Breccia Member
--------------
Wadaira Tuff Member
'''''''/,,,,,,
Kanzaka Mudstone Member
--------------
[ Lower ]

Ichinose Formation
[ Upper ]
--------------
Onazaka Tuff Member
--------------
Shoji Basalt and Mudstone Member
--------------
Kanzaka Mudstone Member
--------------
[ Lower ]

Nishiyatsushiro Group (eastern Minobu, Yamanashi pref.)
[ Upper ]
--------------
Tokiwa Formation
--------------
Furusekigawa Formation
?--?--?--?--?-
[ Lower ]

Nishiyatsushiro Group (western Kofu, Yamanashi pref.)
[ Upper ]
--------------
Kawaguchi Formation
--------------
Ashigawa Formation / Ichinose Formation
--------------
[ Lower ]

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Tokiwa - Ichinose - Misawa - Kanzaka, Minobu city, Minamikoma county, Yamanashi pref.; Iwama - Miyahara - Iwashita, Ichikawamisato city, Nishiyatsushiro county, Yamanashi pref.
Fossils: Gymnosomata

Ozaki and Sugiyama (2018) Geology of the Minobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 169p. (in Japanese with English abstract 7p.)
Katada (1956) Kofu, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 27p. (in Japanese with English abstract 4p.)