Parthasarathy, Gopalakrishnarao, Kunwar, Ajit Chand, Srinivasan, Ramaswamiah (2001) Occurrence of moganite-rich chalcedony in Deccan flood basalts, Killari, Maharashtra, India. European Journal of Mineralogy, 13 (1). 127-134 doi:10.1127/0935-1221/01/0013-0127
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Occurrence of moganite-rich chalcedony in Deccan flood basalts, Killari, Maharashtra, India | ||
| Journal | European Journal of Mineralogy | ||
| Authors | Parthasarathy, Gopalakrishnarao | Author | |
| Kunwar, Ajit Chand | Author | ||
| Srinivasan, Ramaswamiah | Author | ||
| Year | 2001 (January 31) | Volume | 13 |
| Page(s) | 127-134 | Issue | 1 |
| Publisher | Schweizerbart | ||
| DOI | doi:10.1127/0935-1221/01/0013-0127Search in ResearchGate | ||
| Generate Citation Formats | |||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 127941 | Long-form Identifier | mindat:1:5:127941:6 |
| GUID | 0 | ||
| Full Reference | Parthasarathy, Gopalakrishnarao, Kunwar, Ajit Chand, Srinivasan, Ramaswamiah (2001) Occurrence of moganite-rich chalcedony in Deccan flood basalts, Killari, Maharashtra, India. European Journal of Mineralogy, 13 (1). 127-134 doi:10.1127/0935-1221/01/0013-0127 | ||
| Plain Text | Parthasarathy, Gopalakrishnarao, Kunwar, Ajit Chand, Srinivasan, Ramaswamiah (2001) Occurrence of moganite-rich chalcedony in Deccan flood basalts, Killari, Maharashtra, India. European Journal of Mineralogy, 13 (1). 127-134 doi:10.1127/0935-1221/01/0013-0127 | ||
| In | (2001, January) European Journal of Mineralogy Vol. 13 (1) Schweizerbart | ||
| Abstract/Notes | Chalcedony with or without agate banding occurs as amygdaloidal and vein fillings besides zeolites in the ~ 65 Ma old Deccan flood basalts. Thin-section study has shown the occurrence of length-slow fibrous quartz in association with length-fast fibrous chalcedony in samples collected from a depth of 122 meters in a borehole passing through the Deccan basalts at Killari (18°03’N and 76°33’E) in Maharashtra, India. X-ray powder-diffraction studies show at least seven diffraction peaks corresponding to a monoclinic cell of the silica polymorph moganite, with lattice parameters a = 0.876(2) nm; b = 0.688(1) nm; c = 1.0715(2) nm; β = 90.07° in addition to α-quartz. Thermogravimetry indicates moganite contents up to 70 + 10 wt% in moganite-rich samples and 50 + 10 % moganite in chalcedony of Killari borehole samples. Both thermogravimetry and FT-IR spectroscopy point to the presence of a hydrous component in moganite. Solid state 29Si MAS-NMR and 1H MAS-NMR spectroscopic studies show characteristic peaks at -110 ± 2 ppm and 5.28 ± 0.05 ppm respectively, confirming the presence of moganite in the Deccan samples. Moganite of Killari is associated with amygdaloidal flows containing the zeolites- chabazite, natrolite, heulandite and mordenite, but is absent in flows with laumontite, indicating the stability of moganite up to the laumontite zone. | ||
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