The Geology and Petrology of Eastern Singhbhum and Surrounding Areas

abundant altered apatite appear arkose augite banded hematite-quartzite basic igneous rocks basic rocks beds biotite biotite-schists boundary Chaibasa Chaibasa stage chert chloritic chloritic phyllites Chota Nagpur cleavage coarse commonly conglomerate contain correlation Crossed-nicols crystallisation crystals Dalma lavas deposits Dhalbhum Dhanjori group Dhanjori quartzite diorite Dolerite Dunn dykes east eastern epidiorite epidote fault felspar fine-grained folding gabbro Gangpur garnet Geol Geological Survey grade grains granite granophyre hematite hills hornblende hornblende-schists igneous rocks interbedded intergrowth intrusive Iron-ore Series Iron-ore stage Kolhan Series kyanite laterite magma magnetite Manbhum Mayurbhanj memoir metamorphism metamorphosed mica-schists miles mineral mineralisation muscovite Mushabani Newer Dolerite northern Singhbhum occur outcrops Pahar 22 phyllites places plagioclase Plate quartz quartz veins quartz-granulite quartz-schist quartzite ridge Saraikela schistose schists sequence sericite shear zone Singhbhum Singhbhum granite South Singhbhum south-east southern specimens strike Subarnarekha river Survey of India syncline talc-schists thrust zone tourmaline tuffs types ultrabasic varying