| Reference Type | Journal (article/letter/editorial) |
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| Title | A Study of Quartz Orientation and its Relation to Movement in Shear Folds |
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| Journal | Geological Magazine |
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| Authors | Gangopadhyay, P. K. | Author |
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| Johnson, M. R. W. | Author |
| Year | 1962 (February) | Volume | 99 |
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| Issue | 1 |
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| Publisher | Cambridge University Press (CUP) |
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| DOI | doi:10.1017/s0016756800057150Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 249153 | Long-form Identifier | mindat:1:5:249153:4 |
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| GUID | 0 |
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| Full Reference | Gangopadhyay, P. K., Johnson, M. R. W. (1962) A Study of Quartz Orientation and its Relation to Movement in Shear Folds. Geological Magazine, 99 (1) 69-84 doi:10.1017/s0016756800057150 |
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| Plain Text | Gangopadhyay, P. K., Johnson, M. R. W. (1962) A Study of Quartz Orientation and its Relation to Movement in Shear Folds. Geological Magazine, 99 (1) 69-84 doi:10.1017/s0016756800057150 |
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| In | (1962, February) Geological Magazine Vol. 99 (1) Cambridge University Press (CUP) |
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| Abstract/Notes | AbstractThe orientation of quartz in small shear folds, which belong to two movement episodes, is considered to result from laminar flow along the axial plane surfaces. The locations of fabric maxima and girdles are controlled by the orientation of the a–kinematic axis, which in shear folds may not be normal to the fold axis, and the shear surfaces. The earlier fabric consists, essentially, of paired maxima arranged systematically about the axial plane; ac–girdles are absent. The explanation of the near-orthorhombic symmetry of the first fabric in terms of a late “flattening” overprinted upon the previously-formed fold is not favoured: quartz orientation developed during the first folding. The later fabric results from the recrystallization of quartz grains with their largest dimensions and c–axes parallel to the calculated a–kinematic axis of second folding. |
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