Research Article
Evaluation of Caldera Hosted Geothermal Potential during Volcanism and Magmatism in Subduction System, NE Japan
Table 1
Morphology of melt inclusions from Fukano Caldera.
| | Sample | Group1 | ID | Rock classification, formation | Sample condition | Melt inclusion morphology2 | Bubble2 | Daughter mineral2 | Hourglass2 | | Glassy | Crystalline | | Rounded | Elongated | Angular | Rounded | Angular |
| | 160411-1a | SP | 111a | Fine tuff, Fukano F. (Tenjin) | Fresh | X | X | X | O | ∆ | ∆ | O | ∆ | | 160411-1b | SP | 111b | Pumice tuff, Fukano F. (Tenjin) | Fresh | X | X | X | O | ∆ | ∆ | O | ∆ | | 160411-2a | SP | 112a | Pumice tuff, Motosaigo F. | Fresh | O | ∆ | X | X | X | ∆ | X | ∆ | | 160411-3a | SP | 113a | Pumice tuff, Motosaigo F. | Fresh | O | X | ∆ | X | X | ∆ | ∆ | ∆ | | 160411-3b | SP | 113b | Pumice tuff, Motosaigo F. | Fresh | O | ∆ | ∆ | X | X | ∆ | X | ∆ | | 160804-1 | NP | 041 | Pumice tuff, Fukano–Shirasawa F. | Fresh | O | ∆ | X | X | X | ∆ | X | ∆ | | 160804-2 | NP | 042 | Pumice tuff, Fukano F. | Fresh | O | X | ∆ | ∆ | X | ∆ | ∆ | ∆ | | 160804-3s | NP | 043s | Stream sediment | Fresh | O | ∆ | ∆ | ∆ | X | ∆ | ∆ | ∆ | | 160804-3 | NP | 043 | Pyroclastic breccia, Fukano F. | Fresh | O | ∆ | ∆ | ∆ | X | ∆ | ∆ | ∆ | | 160804-4 | NP | 044 | Volcanic breccia, Fukano F. | Fresh | O | ∆ | ∆ | ∆ | X | ∆ | ∆ | O | | 160804-5 | NP | 045 | Fine tuff, Fukano F. | Fresh | O | X | ∆ | X | X | ∆ | X | ∆ | | 160804-6 | NP | 046 | Muddy fine tuff, Fukano F. | Fresh | ∆ | X | X | X | X | ∆ | ∆ | ∆ | | 160804-7 | NP | 047 | Welded tuff, Imotoge F. | Fresh | O | X | X | ∆ | X | ∆ | X | O | | 160804-8 | NP | 048 | Muddy fine tuff, Fukano F. | Altered | X | X | X | O | X | O | X | ∆ | | 160804-9 | NP | 049 | Pumice tuff, Fukano F. | Fresh | O | ∆ | X | X | X | ∆ | X | ∆ | | 160809-1 | NP | 091 | Pumice tuff, Fukano F. | Fresh | ∆ | X | ∆ | ∆ | X | ∆ | ∆ | ∆ | | 160809-3 | NP | 093 | Muddy fine tuff, Fukano F. | Fresh | ∆ | X | X | O | X | O | O | O | | 160809-4 | NP | 094 | Argillized pumice tuff/Fukano F. | Altered | O | ∆ | ∆ | ∆ | ∆ | ∆ | ∆ | ∆ | | 160809-5 | NP | 095 | Strongly hydrothermally altered rocks, Fukano F. | Altered | O | ∆ | ∆ | ∆ | ∆ | ∆ | ∆ | ∆ | | 160809-6 | NP | 096 | Volcanic breccia, Fukano F. | Altered | ∆ | X | ∆ | ∆ | X | ∆ | ∆ | ∆ |
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1NP = northern part of the caldera; SP = southern part of the caldera. 2X = absent; ∆ = exists; and O = abundant.
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