| Reference Type | Journal (article/letter/editorial) |
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| Title | Flow direction and groundmass shear zones in dykes, Shimane Peninsula, Japan |
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| Journal | Geological Magazine |
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| Authors | Smith, J. V. | Author |
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| Miyake, Y. | Author |
| Yamauchi, S. | Author |
| Year | 1993 (January) | Volume | 130 |
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| Issue | 1 |
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| Publisher | Cambridge University Press (CUP) |
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| DOI | doi:10.1017/s0016756800023785Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 255618 | Long-form Identifier | mindat:1:5:255618:9 |
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| GUID | 0 |
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| Full Reference | Smith, J. V., Miyake, Y., Yamauchi, S. (1993) Flow direction and groundmass shear zones in dykes, Shimane Peninsula, Japan. Geological Magazine, 130 (1) 117-120 doi:10.1017/s0016756800023785 |
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| Plain Text | Smith, J. V., Miyake, Y., Yamauchi, S. (1993) Flow direction and groundmass shear zones in dykes, Shimane Peninsula, Japan. Geological Magazine, 130 (1) 117-120 doi:10.1017/s0016756800023785 |
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| In | (1993, January) Geological Magazine Vol. 130 (1) Cambridge University Press (CUP) |
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| Abstract/Notes | AbstractThe groundmass of andesitic dykes at Sezaki, southwest Japan, has trachytic texture and contains microscopic shear zones. The shear zones comprise a conjugate pair formed by flattening of the solidifying dyke rock, probably caused by the magma pressure of the still molten part of the dyke. This pressure shortened the solidifying rock perpendicular to the dyke margins and caused it to extrude parallel to the magma flow direction. The groundmass shears indicate that locally the magma flowed 60° upward in the dykes. It is concluded that while groundmass shears are a useful indicator of flow direction in dykes, phenocryst alignment in dykes is strongly influenced by magma-pressure flattening and thus may be a poor indicator of flow direction |
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