MUKHERJEE, SOUMYAJIT, KOYI, HEMIN A. (2009) Flanking microstructures. Geological Magazine, 146 (4) 517-526 doi:10.1017/s0016756809005986
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Flanking microstructures | ||
| Journal | Geological Magazine | ||
| Authors | MUKHERJEE, SOUMYAJIT | Author | |
| KOYI, HEMIN A. | Author | ||
| Year | 2009 (July) | Volume | 146 |
| Issue | 4 | ||
| Publisher | Cambridge University Press (CUP) | ||
| DOI | doi:10.1017/s0016756809005986Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 260320 | Long-form Identifier | mindat:1:5:260320:3 |
| GUID | 0 | ||
| Full Reference | MUKHERJEE, SOUMYAJIT, KOYI, HEMIN A. (2009) Flanking microstructures. Geological Magazine, 146 (4) 517-526 doi:10.1017/s0016756809005986 | ||
| Plain Text | MUKHERJEE, SOUMYAJIT, KOYI, HEMIN A. (2009) Flanking microstructures. Geological Magazine, 146 (4) 517-526 doi:10.1017/s0016756809005986 | ||
| In | (2009, July) Geological Magazine Vol. 146 (4) Cambridge University Press (CUP) | ||
| Abstract/Notes | AbstractDuctile sheared rocks of the Higher Himalayan Crystalline unit (HHC) in micro-scale reveal flanking microstructures defined by nucleated minerals (the cross-cutting elements, CEs), and deflected cleavages and grain margins (the host fabric elements, HEs) of other minerals. Depending on different or the same senses of drag across the cross-cutting elements, the flanking microstructures are grouped into Type 1 or Type 2 varieties, respectively. Cross-cutting elements of Type 2 flanking microstructures connote post-tectonic directional growth. The cross-cutting elements of the Type 1 flanking microstructures consistently demonstrate top-to-SW non-coaxial shearing in the Higher Himalayan Crystalline unit. Here the external host fabric elements bounding the cross-cutting elements act as the C-planes. These cross-cutting element minerals are usually parallelogram-shaped, underwent crystal-plastic deformation and their nucleations are pre- or syntectonic. The facts that the host fabric elements are dragged even in absence of rheological softening at the boundaries of the cross-cutting elements, and that the cross-cutting elements are non-rigid, indicate strong bonds between the host fabric elements and the cross-cutting elements. Salient morphological variations in the flanking microstructures are: (1) variable intensity and senses of drag along the single and the opposite cross-cutting element margins; (2) host fabric elements defined only at one side of the cross-cutting elements; and (3) presence of a thin hazy zone at the HE–CE contacts. The observed cross-cutting element minerals are either of nearly the same or of greater competency than the mineral grains which host them. | ||
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