K-rich titanate from the Jharia ultrapotassic rock, Gondwana coal fields, eastern India, and its petrological significance |
| |
| Authors: | N V Chalapathi Rao Anup K Sinha Suresh Kumar Rajesh K Srivastava |
| |
| Institution: | 197. Department of Geology, Centre of Advanced Study, Banaras Hindu University, Varanasi, 221 005, India
297. Dr. K.S. Krishnan Geomagnetic Res. Lab., Indian Institute of Geomagnetism, Jhunshi, Allahabad, 221 505, India
|
| |
| Abstract: | We report a rare accessory groundmass mineral of K-rich titanate, having a composition close to that of potassium triskaidecatitanate (K2Ti13O27), from an underground drill-core sample of ultrapotassic rock from southwestern part of the Jharia coal field in the Damodar valley, at the northern margin of the Singhbhum craton, Eastern India. Potassium triskaidecatitanate is regarded as a typomorphic mineral of orangeites (Group II kimberlites) of Kaapvaal craton, southern Africa, and its occurrence in the Jharia ultrapotassic rock is significant since ultrapotassic suite of rocks elsewhere from the Damodar valley have been recently suggested to be peralkaline lamproites based on mineral-genetic classification. The important role played by a unique geodynamic setting (involving a thinned metasomatised lithospheric mantle and inheritance of an Archaean subduction component) at the northern margin of the Singhbhum craton in deciding the petrological diversity of the early Cretaceous ultrapotassic intrusives from the Damodar valley is highlighted in this study. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
