Srivastava, Deepak C. (2001) Deformation Pattern in the Precambrian Basement around Masuda, Central Rajasthan. Journal of the Geological Society of India, 57 (3). 197-222 doi:10.17491/jgsi/2001/570302
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Deformation Pattern in the Precambrian Basement around Masuda, Central Rajasthan | ||
| Journal | Journal of the Geological Society of India | ||
| Authors | Srivastava, Deepak C. | Author | |
| Year | 2001 (March 1) | Volume | 57 |
| Page(s) | 197-222 | Issue | 3 |
| Publisher | Geological Society of India | Place | Bangaluru, India |
| URL | |||
| DOI | doi:10.17491/jgsi/2001/570302Search in ResearchGate | ||
| Generate Citation Formats | |||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 19380719 | Long-form Identifier | mindat:1:5:19380719:0 |
| GUID | 0 | ||
| Full Reference | Srivastava, Deepak C. (2001) Deformation Pattern in the Precambrian Basement around Masuda, Central Rajasthan. Journal of the Geological Society of India, 57 (3). 197-222 doi:10.17491/jgsi/2001/570302 | ||
| Plain Text | Srivastava, Deepak C. (2001) Deformation Pattern in the Precambrian Basement around Masuda, Central Rajasthan. Journal of the Geological Society of India, 57 (3). 197-222 doi:10.17491/jgsi/2001/570302 | ||
| In | (2001, March) Journal of the Geological Society of India Vol. 57 (3). Geological Society of India | ||
| Abstract/Notes | Abstract Detailed mapping of the Precambrian rocks around Masuda in central Rajasthan reveals that the basement is made up of a granulite-granitoid terrane and a sheared gneiss-migmatite terrane. The gneiss-migmatite terrane mainly comprises a multitude of the monzogranite gneisses, amphibolites and migmatised biotite schists. These gneissic-migmatitic rocks are repeatedly mylonitised and folded at scales ranging from thin section to map. The granulite-granitoid terrane consists of massive bodies of granulite and granitoid hosting numerous enclaves of gneiss, monzogranite porphyry and mafic-ultramafic rock. Two successive groups of folds (F1 and F2), each containing two or more sets of co-axial folds are common in the gneiss-migmatite terrane. Whereas the interference between different fold sets belonging to the individual groups has resulted in type 3 interference patterns, the superposition of F2 group folds on F1 group folds has resulted in type 2 interference patterns. Several lines of evidence suggest that Fl and F2 groups of folds have evolved as sheath folds during two phases of ductile shearing, respectively. It is primarily due to the isoclinal nature of the late folds that both the early and late folds display similar style and coplanar relationship in most of the area. A critical comparison reveals that the gneiss-migmatite terranes in the southern and central Rajasthan are different from each other with respect to style of deformation. It is proposed that the basement-cover contact in central Rajasthan may have acted as a décollement surface during a major part of the early deformation in the cover rocks. | ||
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