Abstract
Conglomerates correlatable with the late Meso-Neoproterozoic Kolhan Group in the vicinity of Chamakpur and Baljori villages flanking the Iron Ore Group of rocks of the Jamda-Koira valley, Jharkhand and Orissa, include pebbles of hard high-grade iron ore, which are mined as iron ore. The mode of occurrence and character of these ore-bearing conglomerates suggest them to have been deposited in a proximal alluvial fan setting. The iron ore pebbles are composed of martite and microplaty hematite, and are very similar in appearance to the BIF-hosted iron ores of the Noamundi-Joda deposits of the Iron Ore Group. The ore-bearing conglomerates provide evidence that the hard hematite-rich iron ores of the western Iron Ore Group, from which ore pebbles are most probably derived, must have predated the Kolhan sedimentation and are not related to modern lateritic weathering.
| Original language | English |
|---|---|
| Pages (from-to) | 34-42 |
| Number of pages | 9 |
| Journal | Journal of the Geological Society of India |
| Volume | 70 |
| Issue number | 1 |
| Publication status | Published - Jul 2007 |
Keywords
- Colluvial
- Hydrothermal
- Iron Ore
- Iron Ore Group
- Jamba-Koira valley
- Jharkhand
- Orissa
- Precambrian
- Singhbhum
ASJC Scopus subject areas
- Geology